CN112267996B - Flow pulsation testing device of hydraulic pump - Google Patents
Flow pulsation testing device of hydraulic pump Download PDFInfo
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- CN112267996B CN112267996B CN202011317155.XA CN202011317155A CN112267996B CN 112267996 B CN112267996 B CN 112267996B CN 202011317155 A CN202011317155 A CN 202011317155A CN 112267996 B CN112267996 B CN 112267996B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B51/00—Testing machines, pumps, or pumping installations
Abstract
The invention discloses a flow pulsation testing device of a hydraulic pump, belonging to the technical field of hydraulic system vibration noise testing, which utilizes the control of a valve body and components in a hydraulic system and sets sensors of pressure, flow, temperature and the like to measure the working parameters of the hydraulic system, and the signals obtained by testing are input into a signal analysis system through a signal acquisition system to be processed; the device can correct the system sound velocity and the oil volume elastic modulus under the test working condition in real time, expand the effective range of the hydraulic pump flow pulsation test frequency, solve the problem that the measurement result is invalid due to improper mounting positions of the sensors, and realize accurate measurement of the flow pulsation of the hydraulic pump under different working conditions. The system provided by the invention is simple in composition and convenient to operate, can accurately measure and adjust various working parameters of the system, saves equipment cost and time cost in an experiment, improves the accuracy and efficiency of the flow pulsation test of the hydraulic pump under different working conditions, and has better engineering practical value and application prospect.
Description
Technical Field
The invention belongs to the technical field of vibration noise testing of hydraulic systems, and particularly relates to a flow pulsation testing device of a hydraulic pump.
Background
Due to the structure of the hydraulic pump and compressibility of oil, the hydraulic pump inevitably has periodic flow pulsation, which is the root cause of fluid noise of the hydraulic pump. The flow pulsation and a pipeline and valves in the system are coupled to generate pressure pulsation, and the pressure pulsation is transmitted to the whole hydraulic system through an outlet; meanwhile, the pipeline and the pump shell vibrate to excite mechanical noise and air noise, and the system is unstable or even resonates to seriously damage system components when the system is serious. Therefore, the accurate flow pulsation testing device is established, and the device has important significance for understanding the fluid noise generation mechanism of the hydraulic pump, guiding the low-noise structure optimization design of the hydraulic pump and reducing the vibration noise of the hydraulic system.
The flow pulsation of the hydraulic pump has the characteristics of high frequency and large flow, the existing dynamic flowmeter can only test the flow pulsation not exceeding 300Hz, so an indirect test method must be adopted to test the flow pulsation of the high-frequency hydraulic pump: the flow pulsation is obtained by measuring easily-obtained signals such as pressure, temperature and viscosity in an output pipeline of the hydraulic pump and combining the continuity of fluid and the propagation characteristic of pressure wave through mathematical transformation and calculation. Scholars at home and abroad make a great deal of research on the pump source flow pulsation testing method and design corresponding flow pulsation testing devices. Among them, the "secondary source" flow pulsation test device designed by Edge et al of the university of beth in england and the "dual system/dual pressure" flow pulsation test device proposed by Kojima, a japanese scholar, were formulated by ISO as standard test systems of hydraulic pump flow pulsation in 1996 and 2015, respectively. The 'secondary source' flow pulsation testing device can be used for testing the pump source flow pulsation of a hydraulic pump with a complex pipeline and high frequency and large flow, has wide testing frequency range and high precision, and is comprehensively considered for testing influence factors, but the 'secondary source' method has high requirement on the precision of a testing element, extremely complex data processing process and long time consumption for calculation, and the testing system is complicated and has higher testing cost due to the introduction of an auxiliary testing pump, so that the testing device needs to be processed by personnel with professional knowledge and is not suitable for application in industrial environment. Compared with the prior art, the test method of the double-pressure/double-system test method has the advantages of simple test system arrangement, convenient operation, fast data processing process and higher test result reliability, is suitable for industrial environment, but neglects the influence of test working conditions such as change of rotating speed, pressure, temperature and the like on sound velocity and the volume elastic modulus of oil liquid in the test process; the number of the pressure sensors limits the effective test range of the flow pulsation frequency; the distance between the pressure sensors is integral multiple of half-wavelength of pressure pulsation harmonic wave, so that test results are invalid, and the system has larger deviation of the test results of flow pulsation under special working conditions such as high pressure and high rotating speed.
Disclosure of Invention
The technical problem to be solved by the invention is to solve one or more of the above defects or improvement requirements of the existing flow pulsation testing device: (1) influence of the test working condition on the sound velocity and the volume elastic modulus of the oil is not considered, so that the test result is inaccurate; (2) the number of the pressure sensors limits the effective range of the flow pulsation testing frequency; (3) the invalid test result is caused by the improper placement position of the pressure sensor; (4) the system is complex, the data processing process is complex, the time consumption is long, and the method is not suitable for industrial environment.
In order to achieve the above object, according to one aspect of the present invention, there is provided a flow pulsation testing apparatus of a hydraulic pump, including a hydraulic system, a signal acquisition system, and a signal analysis system;
the hydraulic system comprises a test pipeline connected with an oil discharge port of a tested pump, a first static pressure sensor arranged on the test pipeline, at least three dynamic pressure sensors arranged between the oil discharge port and the first static pressure sensor, a first throttling valve and a second throttling valve, wherein the first throttling valve and the second throttling valve are arranged on one side of the first static pressure sensor, which is far away from the oil discharge port;
the signal analysis system acquires first time domain data and second time domain data of each dynamic pressure sensor under the same test working condition through the signal acquisition system, corrects the sound velocity and the oil volume elastic modulus of the system according to the first time domain data and the second time domain data, and calculates a flow pulsation time domain curve under the test working condition according to the corrected sound velocity, the oil volume elastic modulus, the first time domain data and the second time domain data;
the testing working condition comprises the rotating speed of the tested pump and the pressure value of the testing pipeline;
the first time domain data is acquired under the condition that the second throttling valve is fully opened and the pressure signal of the first static pressure sensor is adjusted to the pressure value required by the test working condition through the first throttling valve;
and the second time domain data is acquired under the condition that the first throttling valve is fully opened and the pressure signal of the first static pressure sensor is adjusted to the pressure value required by the test working condition through the second throttling valve.
Preferably, in the flow pulsation testing device for the hydraulic pump, a distance between a first dynamic pressure sensor of the at least three dynamic pressure sensors and an oil discharge port of the tested pump is 10-15 mm;
the distance between the second dynamic pressure sensor and the first dynamic pressure sensor is 150mm +/-2 mm, and the distance between the second dynamic pressure sensor and the first static pressure sensor is 200-300 mm;
the other dynamic pressure sensors are arranged between the second dynamic pressure sensor and the first static pressure sensor;
the distance between the first throttle valve and the second throttle valve is 150mm +/-5 mm.
Preferably, the flow pulsation testing device of the hydraulic pump further comprises an oil suction pipeline;
the two ends of the oil suction pipeline are respectively connected with an oil suction port and an oil tank of the tested pump, and a second static pressure sensor and a first temperature sensor which are in communication connection with the signal acquisition system are arranged on the oil suction pipeline.
Preferably, in the flow pulsation testing device for the hydraulic pump, the oil suction pipeline is further provided with a first pressure gauge capable of displaying the pressure value of the oil suction pipeline in real time.
Preferably, the flow pulsation testing device of the hydraulic pump further comprises an oil drainage pipeline;
and the two ends of the oil drainage pipeline are respectively connected with an oil drainage port and an oil tank of the tested pump and used for recovering oil of the tested pump.
Preferably, in the flow pulsation testing device for the hydraulic pump, an overflow valve is further arranged on the testing pipeline;
the overflow valve is arranged between the first static pressure sensor and the first throttling valve, and the overflow pressure of the overflow valve is at least set to 120% of the pressure of the test pipeline.
Preferably, the flow pulsation testing apparatus of the hydraulic pump further includes a return line;
and two ends of the return pipeline are respectively connected with the test pipeline and the oil tank, and a flowmeter, a third static pressure sensor and a second temperature sensor which are in communication connection with the signal acquisition system are arranged on the return pipeline.
Preferably, in the flow pulsation testing apparatus for the hydraulic pump, the return pipeline is further provided with a second pressure gauge capable of displaying a pressure value of the return pipeline in real time. .
Preferably, the flow pulsation testing device of the hydraulic pump further comprises a cooler and an oil heater which are arranged on the oil suction pipeline or the return pipeline and used for adjusting the oil temperature of the system.
Preferably, in the flow pulsation testing apparatus for the hydraulic pump, the connection parts of the oil suction pipeline, the oil return pipeline and the oil tank are respectively provided with a filter.
Generally, compared with the prior art, the technical scheme conceived by the invention has the following beneficial effects:
(1) according to the hydraulic pump flow pulsation testing device, more than three dynamic pressure sensors are mounted on a testing pipeline, first time domain data and second time domain data of each dynamic pressure sensor under the same testing working condition are respectively acquired, the system sound velocity and the oil volume elastic modulus under the testing working condition can be corrected in real time according to the first time domain data and the second time domain data, and the effective range of the tested pump flow pulsation testing frequency is expanded;
(2) in the flow pulsation testing device for the hydraulic pump, in order to reduce the influence of the output flow transition process of the hydraulic pump, the relationship between the length of a pipeline and the position of a sensor and the minimum pipeline frequency is considered, and the distance between a first dynamic pressure sensor and an oil outlet of a tested pump is set to be 10-15 mm; the distance between the second dynamic pressure sensor and the first dynamic pressure sensor is set to be 150mm +/-2 mm, and the distance between the second dynamic pressure sensor and the first static pressure sensor is set to be 200-300 mm; the other dynamic pressure sensors are arranged between the second dynamic pressure sensor and the first static pressure sensor; by optimizing the mounting positions of the pressure sensors, the problem that the measurement result is invalid due to improper mounting positions of the sensors is solved, accurate measurement of flow pulsation of the hydraulic pump is achieved, and the method and the device are suitable for application in industrial environments.
(3) The hydraulic pump flow pulsation testing device has the advantages of simple testing system composition, convenient operation and fast data processing process, can accurately adjust and measure various working parameters of the system, saves equipment cost and time cost during testing, improves the accuracy and efficiency of hydraulic pump flow pulsation testing under different working conditions, has important significance for understanding the fluid noise generation mechanism of the hydraulic pump, guiding the optimization design of the low-noise structure of the hydraulic pump and reducing the vibration noise of the hydraulic system, and has better engineering practical value and application prospect.
Drawings
FIG. 1 is a schematic structural diagram of a device for testing flow pulsation of a hydraulic pump according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of the installation of devices on a test line according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of the installation of first, second, and third dynamic pressure sensors on a pipeline according to an embodiment of the present invention;
in all the figures, the same reference numerals denote the same features, in particular:
1. a hydraulic system; 2. a signal acquisition system; 3. a signal analysis system; 4. an oil tank; 5. an oil suction pipeline; 6. testing the pipeline; 7. an oil return line; 8. a pump to be tested; 9. a servo motor; 10. an oil drainage pipeline; 11. a signal acquisition line; 12. a communication line; 13. an overflow valve; 14. a flow meter; 15. a cooler; 16. an oil heater; 17. an oil absorption filter; 18. an oil return filter; 19. a liquid level gauge; 20. an air cleaner; 21. a liquid thermometer.
101. A first dynamic pressure sensor; 102. a second dynamic pressure sensor; 103. a third dynamic pressure sensor;
201. a first temperature sensor; 202. a second temperature sensor;
301. a first pressure gauge; 302. a second pressure gauge;
401. a first static pressure sensor; 402. a second static pressure sensor; 403. a third static pressure sensor;
501. a first throttle valve; 502. a second throttle valve;
601. and (6) sensing the film.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
Fig. 1 is a schematic structural diagram of a hydraulic pump flow pulsation testing apparatus according to a preferred embodiment of the present invention, and referring to fig. 1, the hydraulic pump flow pulsation testing apparatus is composed of three subsystems, namely a hydraulic system 1, a signal acquisition system 2 and a signal analysis system 3.
Specifically, the hydraulic system 1 includes an oil tank 4, an oil suction pipeline 5, a test pipeline 6, an oil return pipeline 7, a pump 8 to be tested, and a servo motor 9. Wherein, the oil suction port, the oil discharge port and the oil discharge port of the tested pump 8 (namely the hydraulic pump to be tested) are respectively provided with an oil suction pipeline 5, a test pipeline 6 and an oil discharge pipeline 10; the test pipeline 6 is connected to the correspondingly arranged oil tank 4 through an oil return pipeline 7, so that the test oil is ensured to be circularly used repeatedly; the oil drainage pipeline 10 is connected to the correspondingly arranged oil tank 4 and is used for recovering corresponding oil liquid; a servo motor 9 is correspondingly arranged on a rotating shaft of the tested pump 8; furthermore, the servo motor is connected with the signal acquisition system 2 through a signal acquisition line 11, the signal acquisition system 2 is connected with the signal analysis system 3 through a signal line 12, the connection modes include but are not limited to a communication line, a network cable, a communication cable and the like, the signal acquisition system 2 sends acquired rotating speed signals to the signal analysis system 3, and the signal analysis system 3 monitors and adjusts the rotating speed signals of the servo motor 9 to ensure that the tested pump 8 can accurately complete flow pulsation tests under different rotating speeds.
Furthermore, two ends of the oil suction pipeline 5 are respectively connected to the oil suction port of the tested pump 8 and the oil tank 4, and the first pressure gauge 301 is arranged on the oil suction pipeline 5, so that a tester can conveniently monitor the pressure of the oil suction port of the tested pump 8. Preferably, an oil suction filter 17 is provided at the connection of the oil suction line 5 and the oil tank 4 to avoid impurities in the oil tank from entering the oil suction line 5. Preferably, a static pressure sensor and a temperature sensor are further arranged on the oil suction pipeline 5, such as a second static pressure sensor 402 and a first temperature sensor 201 which are arranged between the first pressure gauge 301 and the oil suction port of the tested pump 8 and are shown in fig. 1; further, the second static pressure sensor 402 and the first temperature sensor 201 are connected to the signal acquisition system 2 through the signal acquisition line 11, and the signal acquisition system 2 is connected to the signal analysis system 3 through the signal line 12, so as to realize real-time acquisition and monitoring of the pressure and temperature of the oil suction pipeline 5.
Furthermore, the test pipeline 6 is a long, straight and thick-wall hard metal oil pipe with the same diameter as the oil discharge port of the tested pump 8, and the inner diameter of the pipeline is uniform and unchanged; one end of the test pipeline 6 is connected with the oil discharge port of the tested pump 8, and the specific connection mode is not particularly limited and depends on the pipeline interface form of the oil discharge port of the tested pump 8. In a specific example, one end of the test pipeline 6 is correspondingly connected with an oil discharge port of the tested pump 8 in a threaded joint or flange manner, and the other end of the test pipeline is correspondingly connected with the oil return pipeline 7; preferably, the oil return pipeline 7 is a thick-wall hard metal oil pipe with the same pipe diameter as the test pipeline 6.
In this embodiment, the test pipeline 6 is sequentially provided with a first dynamic pressure sensor 101, a second dynamic pressure sensor 102, a third dynamic pressure sensor 103, a first static pressure sensor 401, an overflow valve 13, a first throttle valve 501, and a second throttle valve 502; the first dynamic pressure sensor 101 is provided at an end close to the drain port of the pump 8 under test, and the second throttle 502 is provided at an end far from the drain port of the pump 8 under test.
In a preferred example, the first static pressure sensor 401 and the overflow valve 13 may be disposed at the same position on the test line 6, for example, the first static pressure sensor 401 and the overflow valve 13 are disposed on the same mounting base, and the mounting base is disposed between the third dynamic pressure sensor 103 and the first throttle valve 501; further, the overflow valve 13 is a direct-acting overflow valve, two ends of the overflow valve 13 are connected to the oil tank 4 and the test pipeline 6 through oil pipeline respectively, the overflow valve 13 is arranged as close as possible to the test pipeline 6, so that the influence of a branch oil pipeline on an experimental result is reduced, the overflow pressure of the overflow valve 13 is at least set to be 120% of the pressure of the test pipeline 6, and the effect of safety protection on a test system is achieved. Further, the first throttle 501 and the second throttle 502 are needle valves, and the pressure of the test pipeline 6 is adjusted by adjusting the opening of the valve core.
Referring to fig. 2, in order to reduce the influence of the output flow transition process of the hydraulic pump and simultaneously consider the relationship between the pipe length and the sensor position and the minimum pipe frequency, in this embodiment, the distance x between the first dynamic pressure sensor 101 and the oil discharge port of the tested pump 81Set to a distance x between 10mm and 15mm between the first dynamic pressure sensor 101 and the second dynamic pressure sensor 1022150mm 2mm, the distance x between the second dynamic pressure sensor 102 and the first static pressure 401 sensor3The distance x between the first throttle 501 and the second throttle 502 is set to be between 200mm and 300mm4The setting is 150mm +/-5 mm, and the third dynamic pressure sensor 103 is arranged at the position about the middle between the second dynamic pressure sensor 102 and the first static pressure sensor 401; furthermore, when the first, second and third dynamic pressure sensors are installed, the sensing film 601 of the pressure sensor is as level as possible with the inner wall of the pipeline, and the oil path of the sensor selects a large-hole short flow channel, so that the influence of the liquid flow state in the pipeline on the test result of the sensor is reduced; further, the first dynamic pressure sensor 101, the second dynamic pressure sensor 102, the third dynamic pressure sensor 103 and the first static pressure sensor 401 are all connected to the signal acquisition system 2 through the signal acquisition line 11, and the signal acquisition system 2 transmits the acquired pressure signals to the signal analysis system 3, so that the pressure pulsation of the test pipeline 6 is acquired, monitored, processed and analyzed, and a required test result is obtained.
Furthermore, one end of an oil return pipeline 7 is connected with the test pipeline 6, the other end of the oil return pipeline is connected to the correspondingly arranged oil tank 4, a third static pressure sensor 403, a second pressure gauge 302, a flowmeter 14, a cooler 15 and an oil heater 16 are respectively arranged on the oil return pipeline 7, and all the parts are communicated through oil pipelines. Further, one end of the flow meter 14 is connected to the test line 6 through the return line 7, the other end is connected to the cooler 15 through the return line 7, the cooler 15 is connected to the oil heater 16 through an oil pipeline, and the oil heater 16 is connected to the oil tank 4 through an oil return line. The cooler 15 and the oil heater 16 mainly realize the regulation and control of the system oil temperature, and ensure that the tested pump 8 can accurately complete the flow pulsation test under different temperature working conditions. It should be noted that the cooler 15 and the oil heater 16 may also be disposed on the oil suction line 5, and the temperature regulation function thereof is not affected. Preferably, a return filter 18 is arranged between the oil heater 16 and the oil tank 4 to filter out impurities in the return line 7. Preferably, a static pressure sensor and a temperature sensor are further arranged on the oil return line 7, such as a third static pressure sensor 403 arranged between the test line and the second pressure gauge 302, and a second temperature sensor 202 arranged between the third static pressure sensor 403 and the second pressure gauge 302; further, the flowmeter 14, the third static pressure sensor 403 and the second temperature sensor 202 are connected to the signal acquisition system 2 through the signal acquisition line 11, and the signal acquisition system 2 sends acquired flow, pressure and temperature signals to the signal analysis system 3, so as to realize real-time acquisition and monitoring of the flow, temperature and pressure of the oil return pipeline 7 and detect whether the system is operating normally.
In a preferred example, the oil tank 4 is provided with a liquid level meter 19, an air filter 20 and a liquid temperature meter 21, so that a tester can conveniently monitor the position and the temperature of oil in the oil tank 4, and meanwhile, the effect of preventing particle pollutants in the air from polluting the oil is achieved.
Through the arrangement, the flow pulsation testing device suitable for the hydraulic pump in the preferred embodiment of the invention can be obtained, the flow pulsation testing device for the hydraulic pump is adopted to test the flow pulsation of the hydraulic pump, and the specific testing process mainly comprises the following steps:
(1) confirming that the tested pump 8 is well installed, fully absorbs oil, has adjustable operation condition, confirming that each element of a test system platform is well connected, and recording basic characteristic parameters of the test pipeline such as inner diameter, wall thickness, position of a dynamic pressure sensor, oil density, viscosity and the like;
(2) the system is pre-run before testing, the first throttle valve 501 and the second throttle valve 502 are fully opened, the pump 8 to be tested is pre-run for a sufficient time to clear the system of possible gas influences,
(3) the rotating speed of the servo motor 9, the cooler 15 and the oil heater 16 are adjusted to enable the operating rotating speed and the operating temperature of the motor to meet the requirements of test working conditions, and the rotating speed of the motor and the system temperature in the operating process are monitored in real time through a signal analysis system;
(4) the second throttle valve 502 is fully opened, the pressure of the test pipeline 6 is set to the test working condition pressure by adjusting the first throttle valve 501, and after the system stably runs, the signal acquisition system 2 is used for acquiring time domain data p of the first dynamic pressure sensor 101, the second dynamic pressure sensor 102 and the third dynamic pressure sensor 103 on the test pipeline 61(t)，p2(t)，p3(t) sampling, wherein the sampling time is more than 5s, the signal analysis system 3 records and displays the sampled data in real time, and whether the pressure pulsation of the data is stable and normal is observed;
(5) the first throttle valve 501 is fully opened, the pressure of the test pipeline is set to the pressure of the test working condition again by adjusting the second throttle valve 502, and after the system runs stably, the signal acquisition system 2 is used for acquiring time domain data p 'of the first dynamic pressure sensor 101, the second dynamic pressure sensor 102 and the third dynamic pressure sensor 103 on the test pipeline 6'1(t)，p′2(t)，p′3(t) sampling, wherein the sampling time is more than 5s, the signal analysis system 3 records and displays the sampled data in real time, and whether the pressure pulsation of the data is stable and normal is observed;
(6) the signal analysis system 3 corrects system parameters such as oil viscosity, sound velocity and oil volume elastic modulus under the test working condition by using the data of the dynamic pressure sensor obtained by twice sampling and combining the theories such as the continuity of fluid and the propagation characteristic of pressure wave, and analyzes to obtain the flow pulsation test result of the tested pump under the test working condition;
specifically, the method for obtaining the test result of the flow pulsation of the test pump comprises the following steps:
step 1: filtering and frequency domain conversion of the pressure pulsation signal;
for the time domain data p obtained by the first sampling1(t)，p2(t)，p3(t) carrying out filtering and discrete Fourier transform, and converting the frequency into a harmonic frequency point f under the test working conditioniFrequency domain data P of1,i，P2,i，P3,iIncluding amplitude and phase;
similarly, the time domain data p 'obtained by the second sampling'1(t)，p′2(t)，p′3(t) performing discrete Fourier transform to convert the frequency into a harmonic frequency point f under the test working conditioniFrequency domain data P'1,i，P′2,i，P′3,iIncluding amplitude and phase;
step 2: correcting sound velocity and oil volume elastic modulus;
utilizing two groups of pressure pulsation frequency domain data P obtained in the step 11,i，P2,i，P3,iAnd P'1,i，P′2,i，P′3,iThe speed of sound c of the system under the test condition is measured by adopting a Newton iteration method0And bulk modulus of elasticity B of oileffCarrying out correction;
and step 3: calculating pump source impedance and pump source flow pulsation
Two groups of pressure pulsation frequency domain data P obtained in the step 11,i，P2,i，P3,iAnd P'1,i，P′2,i，P′3,iAnd the system sound velocity c obtained after the correction in the step 20And bulk modulus of elasticity B of oileffThe fluid wave equation is introduced into the pipeline to calculate the harmonic frequency point f under the test working conditioniPump source impedance Z ofs,iAnd pump source flow pulsation Qs,iIncluding the amplitude | Qs,iI and phase angle Qs,iAnd inversely transforming the frequency domain data to obtain a flow pulsation time domain curve q (t) under the test working condition, which is as follows:
(7) after the test is finished, the signal analysis system 3 is used for checking the test data of the flow, the pressure, the temperature and the motor rotating speed in the system, the allowable fluctuation range of the parameters is shown in the following table 1, and if the fluctuation range of any one parameter exceeds the allowable fluctuation range, the test result under the working condition is invalid, and the flow pulsation of the tested pump under the working condition needs to be measured again.
TABLE 1 test system parameter allowable fluctuation Range Table
| System test parameters | Allowable fluctuation range |
| Flow rate | ±2.0％ |
| Pressure of | ±2.0％ |
| Rotating speed of motor | ±0.5％ |
| Temperature of | ±2.0° |
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. A flow pulsation testing device of a hydraulic pump is characterized by comprising a hydraulic system, a signal acquisition system and a signal analysis system;
the hydraulic system comprises a test pipeline connected with an oil discharge port of a tested pump, a first static pressure sensor arranged on the test pipeline, at least three dynamic pressure sensors arranged between the oil discharge port and the first static pressure sensor, a first throttling valve and a second throttling valve, wherein the first throttling valve and the second throttling valve are arranged on one side of the first static pressure sensor, which is far away from the oil discharge port;
the signal analysis system acquires first time domain data and second time domain data of each dynamic pressure sensor under the same test working condition through the signal acquisition system, corrects the sound velocity and the oil volume elastic modulus of the system according to the first time domain data and the second time domain data, and calculates a flow pulsation time domain curve under the test working condition according to the corrected sound velocity, the oil volume elastic modulus, the first time domain data and the second time domain data;
the first time domain data are acquired under the condition that the second throttling valve is fully opened and the pressure signal of the first static pressure sensor is adjusted to the pressure value required by the test working condition through the first throttling valve;
and the second time domain data is acquired under the condition that the first throttling valve is fully opened and the pressure signal of the first static pressure sensor is adjusted to the pressure value required by the test working condition through the second throttling valve.
2. The flow pulsation testing device of a hydraulic pump according to claim 1, wherein the distance between a first dynamic pressure sensor of the at least three dynamic pressure sensors and the oil discharge port of the pump under test is 10-15 mm;
the distance between the second dynamic pressure sensor and the first dynamic pressure sensor is 150mm +/-2 mm, and the distance between the second dynamic pressure sensor and the first static pressure sensor is 200-300 mm;
the other dynamic pressure sensor is disposed between the second dynamic pressure sensor and the first static pressure sensor.
3. The flow pulsation testing device of a hydraulic pump according to claim 1 or 2, further comprising an oil suction line;
the two ends of the oil suction pipeline are respectively connected with an oil suction port and an oil tank of the tested pump, and a second static pressure sensor and a first temperature sensor which are in communication connection with the signal acquisition system are arranged on the oil suction pipeline.
4. The flow pulsation testing device of a hydraulic pump according to claim 3, wherein a first pressure gauge capable of displaying the pressure value of the oil suction pipeline in real time is further disposed on the oil suction pipeline.
5. The flow pulsation testing device of a hydraulic pump according to claim 1 or 4, further comprising an oil drain line;
and the two ends of the oil drainage pipeline are respectively connected with an oil drainage port and an oil tank of the tested pump and used for recovering oil of the tested pump.
6. The flow pulsation testing device of a hydraulic pump according to claim 1 or 2, wherein an overflow valve is further provided on the test line;
the overflow valve is arranged between the first static pressure sensor and the first throttling valve, and the overflow pressure of the overflow valve is at least set to 120% of the pressure of the test pipeline.
7. The flow pulsation testing apparatus of a hydraulic pump according to claim 3, further comprising a return line;
and two ends of the return pipeline are respectively connected with the test pipeline and the oil tank, and a flowmeter, a third static pressure sensor and a second temperature sensor which are in communication connection with the signal acquisition system are arranged on the return pipeline.
8. The apparatus for testing the flow pulsation of a hydraulic pump according to claim 7, wherein a second pressure gauge for displaying a pressure value of the return line in real time is further provided on the return line.
9. The apparatus for testing the flow pulsation of a hydraulic pump according to claim 7, further comprising a cooler and an oil heater provided on the suction line or the return line for adjusting the system oil temperature.
10. The flow pulsation testing device of a hydraulic pump according to claim 7, wherein filters are respectively disposed at the joints of the oil suction pipeline, the oil return pipeline and the oil tank.
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| CN114088924B (en) * | 2021-11-16 | 2023-06-02 | 江苏徐工工程机械研究院有限公司 | Monitoring device and monitoring method for engineering machinery lubricating oil |
| CN113984316B (en) * | 2021-12-24 | 2022-04-05 | 苏州英特模汽车科技有限公司 | Automobile part pressure pulsation test device |
| CN114739470A (en) * | 2022-04-14 | 2022-07-12 | 福州大学 | Method for measuring flow pulsation of high-speed switch valve based on high-frequency dynamic pressure signal |
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