CN103821734A - Method, device and system for adjusting centrifugal water pump inlet flow field - Google Patents

Method, device and system for adjusting centrifugal water pump inlet flow field Download PDF

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CN103821734A
CN103821734A CN201410067014.5A CN201410067014A CN103821734A CN 103821734 A CN103821734 A CN 103821734A CN 201410067014 A CN201410067014 A CN 201410067014A CN 103821734 A CN103821734 A CN 103821734A
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membership
degree
amplitude
angle
fuzzy
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CN103821734B (en
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吕昌
刘汉光
郑淑萍
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Construction Machinery Branch of XCMG
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Abstract

The invention discloses a method, device and system for adjusting a centrifugal water pump inlet flow field. The method comprises the steps that data processing is carried out on collected work parameter signals, and the maximum output amplitude of the work parameter signals and the frequency generated when the amplitude is maximum are acquired; the frequency or the amplitude is used as the subordinating degree function of variables, and the membership degree of the frequency on fuzzy subsets on the discourse domain of the frequency and the membership degree of the amplitude on fuzzy subsets on the discourse domain of the amplitude are respectively acquired; the frequency membership degree and the amplitude membership degree are utilized for inquiring a preset fuzzy control table, and the membership degrees of control angles on fuzzy subsets on the discourse domains of the control angles are acquired; defuzzification is carried out on the membership degrees of the control angles to obtain the corresponding control angles; the angle of a water inlet adjusting valve is adjusted to the control angles. The work parameter signals are collected in real time, the angle of the valve is automatically adjusted according to the changes of the work parameter signals, therefore, the distribution of the water pump inlet flow field is improved, and a water pump cavitation erosion phenomenon is prevented from happening so that the performance of a water pump can be achieved completely.

Description

Regulating method, device and the system of centrifugal water pump inlet flow field
Technical field
The present invention relates to engineering machinery field, particularly a kind of regulating method of centrifugal water pump inlet flow field, device and system.
Background technique
Fire-fighting truck generally adopts Centrifugal water pump as its power source, due to the constraint of car load installing space, cannot before pump intake, long straight tube be installed and improve the Flow Field Distribution of pump intake, in pump working process, because making water pump, unit fixed on water pump suction place fluid field pressure skewness easily there is cavitation phenomenon, greatly reduce pump working efficiency, affect fire-fighting truck overall performance.
Described cavitation erosion is also referred to as cavitation, it is the distinctive a kind of phenomenon of hydraulic machinery, when local area flow stream pressure in runner is reduced to while approaching the pressure for vaporization value of liquid at this temperature, in liquid stream, just start to produce cavity, these abrim the cavity of gas expand very soon, expand and be popular condensing rapidly again to the higher place of pressure with liquid, crumble and fall.The generation of cavity in liquid stream, expand, the process of dieing out relates to many physical phenomenons, has noise, vibration is even to the corrosion function of runner material production, above phenomenon is referred to as cavitation phenomenon.
At present, adopt the fire-fighting truck of Centrifugal water pump, its water intake pipeline is connected with unit fixed on water pump suction flange by the general three-way pipe that adopts of installing space restriction, near fixing guide plate being installed in the pipeline of unit fixed on water pump suction or spiral stator carries out water conservancy diversion to current, play the effect that improves water inlet flow field, prevent that inlet flow field velocity flow profile inequality from causing the generation of cavitation phenomenon.
Prior art conventionally adopts fixed flow guide device, within the scope of certain flow, can play guide functions, but along with the variation of pump working flow, its water conservancy diversion angle cannot be adjusted.At flow, in the time exceeding certain limit, guide functions lost efficacy, and occurred cavitation phenomenon, caused water pump normally to work, and was embodied in outlet pressure and occurred low-frequency high-amplitude fluctuation, and water band is subject to encouraging rear generation acutely to rock and produce with ground friction destruction simultaneously.
Summary of the invention
In view of above technical problem, the invention provides a kind of regulating method, device and system of centrifugal water pump inlet flow field, by the running parameter signal at Real-time Collection pump outlet place, in the time of pump working flow and outlet pressure variation, can automatic regulating valve door angle, improve unit fixed on water pump suction Flow Field Distribution, avoided the generation of cavitation of pump phenomenon, to have given play to water pump performance completely.
According to an aspect of the present invention, provide a kind of regulating method of centrifugal water pump inlet flow field, comprising:
The running parameter signal at Real-time Collection pump outlet place, the Angular correlation of the size of wherein said running parameter signal and water intake modulating valve, in the time that water pump just starts, water intake modulating valve angle is zero-bit;
The running parameter signal gathering is carried out to data processing, to obtain the maximum output amplitude a of running parameter signal and the amplitude frequency f when maximum;
Membership function using frequency f or amplitude a as variable x, obtains respectively described frequency f and the amplitude a degree of membership to fuzzy subset on domain separately;
Utilize frequency degree of membership and amplitude degree of membership to inquire about predefined fuzzy control table, obtain the degree of membership of control angle y to fuzzy subset on angle domain;
The degree of membership of control angle y is carried out to de-fuzzy processing, to obtain corresponding control angle y;
Be described control angle y by water intake modulating valve angular adjustment.
Preferably, described running parameter signal comprises: at least one item in discharge pressure signal, water flow signal, water pipe oscillating signal.
Preferably, the described membership function using frequency f or amplitude a as variable x, the step of obtaining respectively described frequency f and the amplitude a degree of membership to fuzzy subset on domain separately comprises:
The domain of variable x is on average divided into N quantification gradation k i, and determine and described N quantification gradation k icorresponding N fuzzy subset P i, wherein N is greater than 1 natural number, and i is natural number, 1≤i≤N, wherein variable x is frequency f or amplitude a;
Utilize variable x to N fuzzy subset P imembership function P i(x), obtain respectively described frequency f and the amplitude a degree of membership to fuzzy subset on domain separately.
Preferably, described membership function is:
Figure BDA0000470270600000031
Preferably, the described membership function using frequency f or amplitude a as variable x, after obtaining respectively the step of described frequency f and the amplitude a degree of membership to fuzzy subset on domain separately, described method also comprises:
The domain of control angle y is on average divided into N quantification gradation y i, and determine and quantification gradation y ia corresponding N fuzzy subset, wherein N is greater than 1 natural number, and i is natural number, 1≤i≤N.
Preferably, described the degree of membership of control angle y is carried out to de-fuzzy processing, comprises with the step that obtains corresponding control angle y:
Utilize formula
y = Σ i = 1 N y i H i Σ i = 1 N H i
The degree of membership of control angle y is carried out to de-fuzzy processing, to obtain corresponding control angle y, wherein, H ifor the degree of membership of output angle y to i fuzzy subset.
According to a further aspect in the invention, provide a kind of controlling device of centrifugal water pump inlet flow field, comprise signal gathering unit, signal processing unit, fuzzier unit, angle acquiring unit, de-fuzzy unit and angle adjusting, wherein:
Signal gathering unit, for the running parameter signal at Real-time Collection pump outlet place, the Angular correlation of the size of wherein said running parameter signal and water intake modulating valve, in the time that water pump just starts, water intake modulating valve angle is zero-bit;
Data processing unit, for the running parameter signal gathering is carried out to data processing, to obtain the maximum output amplitude a of running parameter signal and the amplitude frequency f when maximum;
Fuzzier unit, for the membership function using frequency f or amplitude a as variable x, obtains respectively described frequency f and the amplitude a degree of membership to fuzzy subset on domain separately;
Angle acquiring unit, for utilizing frequency degree of membership and amplitude degree of membership to inquire about predefined fuzzy control table, obtains the degree of membership of control angle y to fuzzy subset on angle domain;
De-fuzzy unit, for the degree of membership of control angle y is carried out to de-fuzzy processing, to obtain corresponding control angle y;
Angle adjusting, for being described control angle y by water intake modulating valve angular adjustment.
Preferably, described running parameter signal comprises: at least one item in discharge pressure signal, water flow signal, water pipe oscillating signal.
Preferably, described fuzzier unit comprises grade classification module and degree of membership acquisition module, wherein:
Grade classification module, for being on average divided into the domain of variable x N quantification gradation k i, and determine and described N quantification gradation k icorresponding N fuzzy subset P i, wherein N is greater than 1 natural number, and i is natural number, 1≤i≤N, wherein variable x is frequency f or amplitude a;
Profit degree of membership acquisition module, for utilizing variable x to N fuzzy subset P imembership function P i(x), obtain respectively described frequency f and the amplitude a degree of membership to fuzzy subset on domain separately.
Preferably, described membership function is:
Figure BDA0000470270600000041
Preferably, described controlling device also comprises angle classification unit, wherein:
Angle classification unit, for being on average divided into the domain of control angle y N quantification gradation y i, and determine and quantification gradation y ia corresponding N fuzzy subset, wherein N is greater than 1 natural number, and i is natural number, 1≤i≤N.
Preferably, described de-fuzzy unit by using formula
y = Σ i = 1 N y i H i Σ i = 1 N H i
The degree of membership of control angle y is carried out to de-fuzzy processing, to obtain corresponding control angle y, wherein, H ifor the degree of membership of output angle y to i fuzzy subset.
According to a further aspect in the invention, provide a kind of regulating system of centrifugal water pump inlet flow field, comprise the controlling device of centrifugal water pump, intake pipe, outlet pipe and centrifugal water pump inlet flow field.
Preferably, the controlling device of described centrifugal water pump inlet flow field is the controlling device of the centrifugal water pump inlet flow field described in above-mentioned arbitrary embodiment.
The present invention is by the running parameter signal such as such as discharge pressure, water flow, water pipe oscillating signal at Real-time Collection pump outlet place, realize in the time of the running parameter signal intensities such as water pump water outlet flow and outlet pressure, to the automatic adjusting of valve angle, thereby improve unit fixed on water pump suction Flow Field Distribution, avoid the generation of cavitation of pump phenomenon, to have given play to water pump performance completely.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technological scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is an embodiment's of regulating method of centrifugal water pump inlet flow field of the present invention schematic diagram.
Fig. 2 is the schematic diagram of trigonometric function.
Fig. 3 is an embodiment's of membership function of the present invention schematic diagram.
Fig. 4 is another embodiment's of membership function of the present invention schematic diagram.
Fig. 5 is the another embodiment's of membership function of the present invention schematic diagram.
Fig. 6 is by solving the schematic diagram of center of area coordinate in one embodiment of the invention.
Fig. 7 is an embodiment's of controlling device of centrifugal water pump inlet flow field of the present invention schematic diagram.
Fig. 8 is an embodiment's of fuzzier unit of the present invention schematic diagram.
Fig. 9 is another embodiment's of controlling device of centrifugal water pump inlet flow field of the present invention schematic diagram.
Figure 10 is an embodiment's of regulating system of centrifugal water pump inlet flow field of the present invention schematic diagram.
Figure 11 utilizes membership function to ask for the schematic diagram of amplitude degree of membership in one embodiment of the invention.
Figure 12 utilizes membership function to ask for the schematic diagram of frequency degree of membership in one embodiment of the invention.
Figure 13 is the schematic diagram of realizing de-fuzzy in one embodiment of the invention by solving center of area coordinate.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technological scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, rather than whole embodiments.Illustrative to the description only actually of at least one exemplary embodiment below, never as any restriction to the present invention and application or use.Based on the embodiment in the present invention, those of ordinary skills, not making the every other embodiment who obtains under creative work prerequisite, belong to the scope of protection of the invention.
Unless illustrate in addition, otherwise the parts of setting forth in these embodiments and positioned opposite, numeral expression formula and the numerical value of step not limited the scope of the invention.
, it should be understood that for convenience of description, the size of the various piece shown in accompanying drawing is not to draw according to actual proportionate relationship meanwhile.
May not discuss in detail for the known technology of person of ordinary skill in the relevant, method and apparatus, but in suitable situation, described technology, method and apparatus should be regarded as authorizing a part for specification.
In all examples with discussing shown here, it is exemplary that any occurrence should be construed as merely, rather than as restriction.Therefore, other example of exemplary embodiment can have different values.
It should be noted that: in similar label and letter accompanying drawing below, represent similar terms, therefore, once be defined in an a certain Xiang Yi accompanying drawing, in accompanying drawing subsequently, do not need it to be further discussed.
Fig. 1 is an embodiment's of regulating method of centrifugal water pump inlet flow field of the present invention schematic diagram.Preferably, the present embodiment can be carried out by the controlling device of centrifugal water pump inlet flow field.The method comprises the following steps:
Step 101, the running parameter signal at Real-time Collection pump outlet place, the Angular correlation of the size of wherein said running parameter signal and water intake modulating valve, in the time that water pump just starts, input initialize signal r, make modulating valve in a certain fixed position, and to set this fixed position place water intake modulating valve angle be zero-bit.
Step 102, carries out data processing to the running parameter signal gathering, to obtain the maximum output amplitude a of running parameter signal and the amplitude frequency f when maximum.
Step 103, the membership function using frequency f or amplitude a as variable x, obtains respectively described frequency f and the amplitude a degree of membership to fuzzy subset on domain separately.
Step 104, utilizes frequency degree of membership and amplitude degree of membership to inquire about predefined fuzzy control table, obtains the degree of membership of control angle y to fuzzy subset on angle domain.
Step 105, carries out de-fuzzy processing to the degree of membership of control angle y, to obtain corresponding control angle y.
Step 106 is described control angle y by water intake modulating valve angular adjustment.
The regulating method of the centrifugal water pump inlet flow field providing based on the above embodiment of the present invention, by the running parameter signal such as such as discharge pressure, water flow, water pipe oscillating signal at Real-time Collection pump outlet place, realize in the time of the running parameter signal intensities such as water pump water outlet flow and outlet pressure, to the automatic adjusting of valve angle, thereby improve unit fixed on water pump suction Flow Field Distribution, avoid the generation of cavitation of pump phenomenon, to have given play to water pump performance completely.
Preferably, in step 101, described running parameter signal can comprise at least one in discharge pressure signal, water flow signal, water pipe oscillating signal.
Preferably, in step 102, described data processing can comprise: the running parameter signal gathering is carried out to bandpass filtering; Then carry out fft and obtain the maximum output amplitude a of running parameter signal and the frequency f of amplitude when maximum.
Preferably, the cutoff frequency of described bandpass filtering is 2-25Hz.
Preferably, step 103 can comprise:
The domain of variable x is on average divided into N quantification gradation k i, and determine and described N quantification gradation k icorresponding N fuzzy subset P i, wherein N is greater than 1 natural number, and i is natural number, 1≤i≤N, wherein variable x is frequency f or amplitude a;
Utilize variable x to N fuzzy subset P imembership function P i(x), obtain respectively described frequency f and the amplitude a degree of membership to fuzzy subset on domain separately.
Preferably, described membership function P i(x) can be full crossover, equally distributed triangle membership function.
By trigonometric function analytic expression μ be as shown in Figure 2 (x):
Figure BDA0000470270600000071
Can derive described membership function P i(x) representation is:
Figure BDA0000470270600000081
Particularly, as shown in Figure 3, in the time of N=2, comprise 2 quantification gradation k by the domain of variable x i, 1≤i≤2, and determine and described 2 quantification gradation k i2 corresponding fuzzy subset P itime, described membership function P i(x) specifically can comprise:
Figure BDA0000470270600000082
In the time of N>2, the domain of variable x is on average divided into N quantification gradation k i, i.e. k i-k i-1=k i+1-k i, and determine and described N quantification gradation k icorresponding N fuzzy subset P i, wherein said membership function P i(x) specifically can comprise:
Figure BDA0000470270600000083
Wherein, described membership function P i(x) comprise the isosceles triangle P of N-2 same shape i(x), 2≤i≤N-1, and the each right-angled triangle P of head and the tail 1(x), P n(x).
Membership function P for example, when, Fig. 4 is N=5 described in i(x) schematic diagram, now described membership function P i(x) specifically can comprise:
Figure BDA0000470270600000084
In a preferred embodiment of the invention, described running parameter signal is discharge pressure signal, rule of thumb known, the amplitude a of Pressure Fluctuation Signal is generally (0.1MPa, 0.5MPa) change, and frequency f is generally in (2Hz, 24Hz) range, control valve angle excursion is (90 °, 90 °).
Get so respectively the domain A=[0.1 of amplitude a and frequency f, 0.5], F=[2,24], output domain Y=[-90,90], input, output variable all adopt triangle, full crossover, equally distributed membership function, and each variable is [negative large, negative little with 5 fuzzy subsets, zero, just little, honest] describe.Can be designated as:
A=｛NL，NS，ZE，PS，PL｝
F=｛NL，NS，ZE，PS，PL｝
Y=｛NL，NS，ZE，PS，PL｝
Input variable frequency f, amplitude a and output variable control angle y meet the membership function P shown in Fig. 4 i(x), the quantification gradation of concrete frequency f, amplitude a and control angle y is divided as shown in Figure 5.Now, described membership function P i(x) specifically can comprise:
Wherein, the amplitude a of discharge pressure signal can on average be divided into 0.1,0.2,0.3,0.4,0.5(MPa) five quantification gradations; The frequency f of discharge pressure signal can on average be divided into 2,7.5,13,18.5,24(Hz); Control angle y can on average be divided into-90 ,-45,0,45,90(degree).
Preferably, if input, output variable all adopt 5 fuzzy subsets [negative large, negative little, zero, just little, honest], { NL, NS, ZE, PS, PL } describes, and the fuzzy control table in step 104 can be fuzzy control table as described in Table 1.
Figure BDA0000470270600000092
Table 1
Preferably, after step 103, described method can also comprise:
The domain of control angle y is on average divided into N quantification gradation y i, and determine and quantification gradation y ia corresponding N fuzzy subset, wherein N is greater than 1 natural number, and i is natural number, 1≤i≤N.
Preferably, step 105 can comprise: utilize formula (1) to carry out de-fuzzy processing to the degree of membership of control angle y, and to obtain corresponding control angle y,
y = Σ i = 1 N y i H i Σ i = 1 N H i - - - ( 1 )
Wherein, H ifor the degree of membership of output angle y to i fuzzy subset.
As shown in Figure 6, the principle of described formula (1) is that center of area coordinate by solving membership function curve and abscissa besieged city area is as the final output value of fuzzy reasoning.
Fig. 7 is an embodiment's of controlling device of centrifugal water pump inlet flow field of the present invention schematic diagram.The controlling device of described centrifugal water pump inlet flow field, comprises signal gathering unit 701, signal processing unit 702, fuzzier unit 703, angle acquiring unit 704, de-fuzzy unit 705 and angle adjusting 706, wherein:
Signal gathering unit 701, for the running parameter signal at Real-time Collection pump outlet place, the Angular correlation of the size of wherein said running parameter signal and water intake modulating valve, in the time that water pump just starts, water intake modulating valve angle is zero-bit.
Data processing unit 702, for the running parameter signal gathering is carried out to data processing, to obtain the maximum output amplitude a of running parameter signal and the amplitude frequency f when maximum.
Fuzzier unit 703, for the membership function using frequency f or amplitude a as variable x, obtains respectively described frequency f and the amplitude a degree of membership to fuzzy subset on domain separately.
Angle acquiring unit 704, for utilizing frequency degree of membership and amplitude degree of membership to inquire about predefined fuzzy control table, obtains the degree of membership of control angle y to fuzzy subset on angle domain.
De-fuzzy unit 705, for the degree of membership of control angle y is carried out to de-fuzzy processing, to obtain corresponding control angle y.
Angle adjusting 706, for being described control angle y by water intake modulating valve angular adjustment.
The controlling device of the centrifugal water pump inlet flow field providing based on the above embodiment of the present invention, by the running parameter signal such as such as discharge pressure, water flow, water pipe oscillating signal at Real-time Collection pump outlet place, realize in the time of the running parameter signal intensities such as water pump water outlet flow and outlet pressure, to the automatic adjusting of valve angle, thereby improve unit fixed on water pump suction Flow Field Distribution, avoid the generation of cavitation of pump phenomenon, to have given play to water pump performance completely.
Particularly, based on the above embodiment of the present invention, in pump working process, if occur that cavitation phenomenon causes the vibration of water band, signal gathering unit can detect the unusual fluctuations signal of described running parameter.Controlling device of the present invention can obtain the control angle with described running parameter signal after running parameter signal is processed, finally make the pressure anomaly blackout under this operating mode by the Angulation changes of water intake modulating valve, thereby water pump is normally worked.
Preferably, described running parameter signal can comprise: at least one item in discharge pressure signal, water flow signal, water pipe oscillating signal.
Correspondingly, described signal gathering unit 701 can be at least one in pressure transducer, flow transducer and vibration transducer.
Preferably, described water intake modulating valve can be arranged on the position near intake pipe, thereby can promote the effect of flow field regulation, improves Flow Field Distribution and solves water pump abnormal vibrations.
Preferably, described de-fuzzy unit specifically utilizes formula (1) to carry out de-fuzzy processing to the degree of membership of control angle y, to obtain corresponding control angle y,
y = Σ i = 1 N y i H i Σ i = 1 N H i - - - ( 1 )
Wherein, H ifor the degree of membership of output angle y to i fuzzy subset.
Preferably, as shown in Figure 8, described fuzzier unit comprises grade classification module 801 and degree of membership acquisition module 802, wherein:
Grade classification module 801, for being on average divided into the domain of variable x N quantification gradation k i, and determine and described N quantification gradation k icorresponding N fuzzy subset P i, wherein N is greater than 1 natural number, and i is natural number, 1≤i≤N, wherein variable x is frequency f or amplitude a;
Profit degree of membership acquisition module 802, for utilizing variable x to N fuzzy subset P imembership function P i(x), obtain respectively described frequency f and the amplitude a degree of membership to fuzzy subset on domain separately.
Preferably, described membership function is:
Figure BDA0000470270600000121
Fig. 9 is another embodiment's of controlling device of centrifugal water pump inlet flow field of the present invention schematic diagram.Compared with embodiment illustrated in fig. 7, in the embodiment shown in fig. 9, described controlling device also comprises angle classification unit 901, wherein:
Angle classification unit 901, for being on average divided into the domain of control angle y N quantification gradation y i, and determine and quantification gradation y ia corresponding N fuzzy subset, wherein N is greater than 1 natural number, and i is natural number, 1≤i≤N.
Preferably, described controlling device also comprises display unit, wherein:
Described display unit, the definite control angle of running parameter signal and de-fuzzy unit gathering for display collecting unit.User can be by reference to the definite control angle in de-fuzzy unit thus, the angle of manual tune water intake modulating valve.
The above embodiment of the present invention can regulate by the mode regulating manually or automatically the angle of water intake modulating valve, also can use two kinds of regulative modes to combine, and can further improve thus degree of regulation and degree of accuracy.
Preferably, the function of described fuzzier unit 703, angle acquiring unit 704, angle classification unit 901 and de-fuzzy unit 705 can be realized by fuzzy controller.
Preferably, the controller that the present invention can also see service study by other by the running parameter Signal Regulation water intake modulating valve angle of conversion is realized, for example fuzzy (Proportion Integration Differentiation, proportional-integral-differential) controller, nerve network controller etc.
Figure 10 is an embodiment's of regulating system of centrifugal water pump inlet flow field of the present invention schematic diagram.Described regulating system comprises the controlling device 1005 of water intake modulating valve 1001, intake pipe 1002, centrifugal water pump 1003, outlet pipe 1004 and centrifugal water pump inlet flow field.
Preferably, the controlling device 1005 of described centrifugal water pump inlet flow field can be the controlling device of the centrifugal water pump inlet flow field described in arbitrary embodiment shown in Fig. 7-Fig. 9.
The regulating system of the centrifugal water pump inlet flow field providing based on the above embodiment of the present invention, by the running parameter signal such as such as discharge pressure, water flow, water pipe oscillating signal at Real-time Collection pump outlet place, realize in the time of the running parameter signal intensities such as water pump water outlet flow and outlet pressure, to the automatic adjusting of valve angle, thereby improve unit fixed on water pump suction Flow Field Distribution, avoid the generation of cavitation of pump phenomenon, to have given play to water pump performance completely.
Preferably, described water intake modulating valve 1001 can be arranged on the position near intake pipe.Thereby can promote the effect of flow field regulation, improve Flow Field Distribution and solve water pump abnormal vibrations.
Below by concrete example, the present invention will be described:
In a specific embodiment, described signal gathering unit is outlet pipe pressure transducer.Described outlet pipe pressure transducer transfers to signal processing unit, output amplitude a=0.45Mpa after signal processing unit processes, frequency f=14Hz by the dynamic water outlet Dynamic Signal P detecting;
Membership function according to shown in Fig. 5:
Figure BDA0000470270600000131
Due to output amplitude a=0.45Mpa, can obtain 0.4Mpa=k 4<a<k 5=0.5Mpa.
Thus, as shown in figure 11, pressure amplitude a only has the degree of membership of PS and PL non-vanishing, and fuzzier unit brings a=0.45Mpa into PS (x) and PL (x) can calculate:
Pressure P S degree of membership PS (a)=(a-k 5)/(k 4-k 5)=(0.45-0.5)/(0.4-0.5)=0.5;
Pressure P L degree of membership PL (a)=(a-k 4)/(k 5-k 4)=(0.45-0.4)/(0.5-0.4)=0.5.
In like manner, due to output amplitude f=14Hz, can obtain 13Hz=k 3<f<k 4=18.5Hz.
Thus, as shown in figure 12, pressure amplitude f only has the degree of membership of ZE and PS non-vanishing, and fuzzier unit brings f=14Hz into ZE (x) and PS (x) can calculate:
According to frequency membership function curve, calculate:
Frequency ZE degree of membership
ZE(f)=（f-k 4）/（k 3-k 4）=（14-18.5）/（13-18.5）=0.82
Frequency PS degree of membership
PS(f)=（f-k 3）/（k 4-k 3）=（14-13）/（18.5-13）=0.18
By above-mentioned steps, fuzzier unit can obtain:
Corresponding two rules of pressure a are respectively { ZE, PS }, and its degree of membership is respectively 0.5,0.5.
Corresponding two rules of frequency f are respectively { ZE, PS }, and its degree of membership is respectively 0.82,0.18.
Angle acquiring unit can draw according to fuzzy control table 1, and the fuzzy variable of output y meets fuzzy rule as shown in table 2.
Figure BDA0000470270600000141
Table 2
Therefore angle acquiring unit can obtain two rules that y is corresponding for { PL, PS }, and its degree of membership is respectively:
PL degree of membership PS (y)=(0.5*0.82+0.5*0.18+0.5*0.82)=0.91
PS degree of membership PL (y)=(0.5*0.18)=0.09
As shown in figure 13, de-fuzzy unit can utilize formula (1) calculating diagram membership function and abscissa to surround the center of area coordinate of graphics area, can export control angle y,
Figure 20141006701451000021
Finally, it is 85.6 ° that de-fuzzy unit obtains valve control angle, and angle adjusting is 85.6 ° of described control angles by water intake modulating valve angular adjustment.
By implementing the present invention, can obtain following beneficial effect:
1, the present invention is by the running parameter signal such as such as discharge pressure, water flow, water pipe oscillating signal at Real-time Collection pump outlet place, realize in the time of the running parameter signal intensities such as water pump water outlet flow and outlet pressure, to the automatic adjusting of valve angle, thereby improve unit fixed on water pump suction Flow Field Distribution, avoid the generation of cavitation of pump phenomenon, to have given play to water pump performance completely.
2, water intake modulating valve is arranged on the position near intake pipe by the present invention, thereby can promote the effect of flow field regulation, improves Flow Field Distribution and solve water pump abnormal vibrations.
3, the present invention can regulate by the mode regulating manually or automatically the angle of water intake modulating valve, also can use two kinds of regulative modes to combine, and can further improve thus degree of regulation and degree of accuracy.
4, the present invention can use one or more in discharge pressure signal, water flow signal, water pipe oscillating signal to control water intake modulating valve, can further improve thus degree of regulation, has guaranteed the normal work of water pump.
So far, described the present invention in detail.For fear of covering design of the present invention, details more known in the field are not described.Those skilled in the art, according to description above, can understand how to implement technological scheme disclosed herein completely.
One of ordinary skill in the art will appreciate that all or part of step that realizes above-described embodiment can complete by hardware, also can carry out the hardware that instruction is relevant by program completes, described program can be stored in a kind of computer-readable recording medium, the above-mentioned storage medium of mentioning can be ROM (read-only memory), disk or CD etc.
Description of the invention provides for example with for the purpose of describing, and is not exhaustively or limit the invention to disclosed form.Many modifications and variations are obvious for the ordinary skill in the art.Selecting and describing embodiment is for better explanation principle of the present invention and practical application, thereby and makes those of ordinary skill in the art can understand the present invention's design to be suitable for the various embodiments with various modifications of special-purpose.

Claims (13)

1. a regulating method for centrifugal water pump inlet flow field, is characterized in that, comprising:
The running parameter signal at Real-time Collection pump outlet place, the Angular correlation of the size of wherein said running parameter signal and water intake modulating valve, in the time that water pump just starts, water intake modulating valve angle is zero-bit;
The running parameter signal gathering is carried out to data processing, to obtain the maximum output amplitude a of running parameter signal and the amplitude frequency f when maximum;
Membership function using frequency f or amplitude a as variable x, obtains respectively described frequency f and the amplitude a degree of membership to fuzzy subset on domain separately;
Utilize frequency degree of membership and amplitude degree of membership to inquire about predefined fuzzy control table, obtain the degree of membership of control angle y to fuzzy subset on angle domain;
The degree of membership of control angle y is carried out to de-fuzzy processing, to obtain corresponding control angle y;
Be described control angle y by water intake modulating valve angular adjustment.
2. regulating method according to claim 1, is characterized in that, described running parameter signal comprises: at least one item in discharge pressure signal, water flow signal, water pipe oscillating signal.
3. regulating method according to claim 1, is characterized in that, the described membership function using frequency f or amplitude a as variable x, and the step of obtaining respectively described frequency f and the amplitude a degree of membership to fuzzy subset on domain separately comprises:
The domain of variable x is on average divided into N quantification gradation k i, and determine and described N quantification gradation k icorresponding N fuzzy subset P i, wherein N is greater than 1 natural number, and i is natural number, 1≤i≤N, wherein variable x is frequency f or amplitude a;
Utilize variable x to N fuzzy subset P imembership function P i(x), obtain respectively described frequency f and the amplitude a degree of membership to fuzzy subset on domain separately.
4. regulating method according to claim 3, is characterized in that, described membership function is:
Figure FDA0000470270590000021
5. regulating method according to claim 1, it is characterized in that, the described membership function using frequency f or amplitude a as variable x, after obtaining respectively the step of described frequency f and the amplitude a degree of membership to fuzzy subset on domain separately, described method also comprises:
The domain of control angle y is on average divided into N quantification gradation y i, and determine and quantification gradation y ia corresponding N fuzzy subset, wherein N is greater than 1 natural number, and i is natural number, 1≤i≤N.
6. regulating method according to claim 5, is characterized in that, described the degree of membership of control angle y is carried out to de-fuzzy processing, comprises with the step that obtains corresponding control angle y:
Utilize formula
y = &Sigma; i = 1 N y i H i &Sigma; i = 1 N H i
The degree of membership of control angle y is carried out to de-fuzzy processing, to obtain corresponding control angle y, wherein, H ifor the degree of membership of output angle y to i fuzzy subset.
7. a controlling device for centrifugal water pump inlet flow field, is characterized in that, comprises signal gathering unit, signal processing unit, fuzzier unit, angle acquiring unit, de-fuzzy unit and angle adjusting, wherein:
Signal gathering unit, for the running parameter signal at Real-time Collection pump outlet place, the Angular correlation of the size of wherein said running parameter signal and water intake modulating valve, in the time that water pump just starts, water intake modulating valve angle is zero-bit;
Data processing unit, for the running parameter signal gathering is carried out to data processing, to obtain the maximum output amplitude a of running parameter signal and the amplitude frequency f when maximum;
Fuzzier unit, for the membership function using frequency f or amplitude a as variable x, obtains respectively described frequency f and the amplitude a degree of membership to fuzzy subset on domain separately;
Angle acquiring unit, for utilizing frequency degree of membership and amplitude degree of membership to inquire about predefined fuzzy control table, obtains the degree of membership of control angle y to fuzzy subset on angle domain;
De-fuzzy unit, for the degree of membership of control angle y is carried out to de-fuzzy processing, to obtain corresponding control angle y;
Angle adjusting, for being described control angle y by water intake modulating valve angular adjustment.
8. controlling device according to claim 7, is characterized in that, described running parameter signal comprises: at least one item in discharge pressure signal, water flow signal, water pipe oscillating signal.
9. controlling device according to claim 7, is characterized in that, described fuzzier unit comprises grade classification module and degree of membership acquisition module, wherein:
Grade classification module, for being on average divided into the domain of variable x N quantification gradation k i, and determine and described N quantification gradation k icorresponding N fuzzy subset P i, wherein N is greater than 1 natural number, and i is natural number, 1≤i≤N, wherein variable x is frequency f or amplitude a;
Profit degree of membership acquisition module, for utilizing variable x to N fuzzy subset P imembership function P i(x), obtain respectively described frequency f and the amplitude a degree of membership to fuzzy subset on domain separately.
10. controlling device according to claim 9, described membership function is:
Figure FDA0000470270590000031
11. controlling devices according to claim 7, is characterized in that, also comprise angle classification unit, wherein:
Angle classification unit, for being on average divided into the domain of control angle y N quantification gradation y i, and determine and quantification gradation y ia corresponding N fuzzy subset, wherein N is greater than 1 natural number, and i is natural number, 1≤i≤N.
12. controlling devices according to claim 11, is characterized in that, described de-fuzzy unit by using formula
y = &Sigma; i = 1 N y i H i &Sigma; i = 1 N H i
The degree of membership of control angle y is carried out to de-fuzzy processing, to obtain corresponding control angle y, wherein, H ifor the degree of membership of output angle y to i fuzzy subset.
The regulating system of 13. 1 kinds of centrifugal water pump inlet flow fields, is characterized in that, comprises the controlling device of water intake modulating valve, intake pipe, centrifugal water pump, outlet pipe and the centrifugal water pump inlet flow field as described in any one in claim 6-12.
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