CN113551906A - Pressure fluctuation testing device and method for hydraulic driving system - Google Patents
Pressure fluctuation testing device and method for hydraulic driving system Download PDFInfo
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- G—PHYSICS
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- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
- G01M13/02—Gearings; Transmission mechanisms
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
- G01M13/02—Gearings; Transmission mechanisms
- G01M13/027—Test-benches with force-applying means, e.g. loading of drive shafts along several directions
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Abstract
The device comprises a test tool, a power supply module, a pressure sensor and a test system, wherein the test tool comprises a torque manager, and a test piece is connected with the torque manager; the test system comprises a controller, wherein the controller is connected with a power supply module and used for outputting a test starting instruction, the power supply module receives the test starting instruction and outputs a power supply signal, and the controller receives the power supply signal and outputs a voltage climbing signal; the test piece receives the voltage climbing signal to drive the torque manager to act and output a pressure signal, and the voltage climbing rate is 0.18V/S; the pressure sensor receives the pressure signal and outputs a pressure detection signal; the test system also comprises a display device, and the controller is also respectively connected with the pressure sensor and the display device; the controller receives the pressure detection signal and outputs a pressure waveform signal; the display device receives the pressure fluctuation signal and displays a pressure fluctuation curve. The test to plunger pump pressure fluctuation value is realized to this application off-line.
Description
Technical Field
The application relates to the field of pressure fluctuation testing, in particular to a pressure fluctuation testing device of a hydraulic driving system.
Background
The hydraulic driving system uses hydraulic oil as a working medium and utilizes the pressure of the hydraulic oil to transmit power.
The plunger pump is an important device of the hydraulic drive system. The plunger reciprocates in the cylinder body to change the volume of the sealed working cavity so as to absorb and press oil. The plunger pump has the advantages of high rated pressure, compact structure, high efficiency, convenient flow regulation and the like, and is widely applied to occasions with high pressure, large flow and flow needing regulation, such as hydraulic machines, engineering machinery and ships.
In an automobile system, a plunger pump is used as a power source for combining a clutch hub, and if output pressure fluctuates in the using process, the combination state of the clutch hub is unstable, power transmission is unstable, and NVH problems such as vehicle body vibration, play, noise and the like are caused finally.
Disclosure of Invention
In order to realize the testing of the pressure fluctuation value of the plunger pump offline, the application provides a pressure fluctuation testing method and device of a hydraulic driving system and electronic equipment.
In a first aspect, the present application provides a pressure fluctuation testing apparatus for a hydraulic drive system, which adopts the following technical scheme:
a pressure fluctuation testing device of a hydraulic drive system comprises a testing tool, a power supply module, a pressure sensor and a testing system, wherein the testing tool comprises a torque manager, and the torque manager is connected with a testing piece;
the test system comprises a controller, the controller is respectively connected with the power supply module and the test piece, the controller outputs a test starting instruction, the power supply module receives the test starting instruction and outputs a power supply signal, and the controller receives the power supply signal and outputs a voltage climbing signal;
the test piece receives the voltage climbing signal to drive the torque manager to act, and the voltage climbing rate is 0.18V/S;
the pressure sensor is used for detecting the pressure output by the torque manager and outputting a pressure detection signal;
the test system also comprises a display device, and the controller is also respectively connected with the pressure sensor and the display device; the controller receives the pressure detection signal, generates a pressure fluctuation curve and outputs a display signal;
and the display device receives the display signal and displays a pressure fluctuation curve.
Through adopting above-mentioned technical scheme, the controller outputs the test and begins the instruction, power module receives the test and begins the instruction, output power signal, the controller receives power signal output voltage signal of climbing, the test piece receives the voltage signal of climbing action, drive the action of torque manager, pressure sensor detects the pressure of torque manager output in real time, and output pressure detection signal, the controller receives pressure detection signal and generates the pressure fluctuation curve, and output pressure fluctuation signal, the display receives pressure fluctuation signal display pressure fluctuation value, the staff can realize that the line detects the pressure fluctuation value of plunger pump under the different pressure values through the pressure fluctuation testing arrangement.
Optionally, the pressure sensor further comprises a low-pass filter and a high-pass filter, the low-pass filter is connected to the pressure sensor, the high-pass filter is connected to the low-pass filter, the high-pass filter is further connected to the controller, and pressure detection signals output by the pressure sensor are sequentially subjected to filtering processing by the low-pass filter and the high-pass filter and are transmitted to the controller.
By adopting the technical scheme, the high-pass filter and the low-pass filter are arranged, so that the pressure detection signal output by the pressure sensor is processed by the low-pass filter and the high-pass filter in sequence and then transmitted to the controller, most of interference signals are filtered by the low-pass filter and the high-pass filter, and the obtained pressure fluctuation curve can better reflect the pressure change.
Optionally, the cut-off frequency of the low-pass filter is 250Hz, and the cut-off frequency of the high-pass filter is 10 Hz.
Optionally, the controller transmits the voltage climbing signal to the test piece through CAN communication.
In a second aspect, the present application provides a plunger pump pressure fluctuation testing method, which adopts the following technical scheme:
a method for testing force fluctuation of a column hydraulic drive system comprises the following steps,
outputting a test starting instruction through a controller, receiving the test starting instruction by a power supply module, and outputting a power supply signal, receiving the power supply signal by the controller, and outputting a voltage climbing signal to drive the test piece to act;
the test piece acts to drive the torque manager to act to output a pressure signal, and the pressure sensor collects the pressure signal in real time to output a pressure detection signal;
the controller receives the pressure detection signal in real time, generates a pressure curve, and draws an upper envelope curve and a lower envelope curve according to the pressure curve;
calculating the difference value of an upper envelope curve and a lower envelope curve in preset time through the controller, wherein the difference value of the upper envelope curve and the lower envelope curve is a pressure fluctuation value, and fitting a time pressure fluctuation curve according to the difference value of the upper envelope curve and the lower envelope curve in a plurality of preset times, wherein the time pressure fluctuation curve is a curve of the pressure fluctuation value changing along with time;
determining a corresponding pressure value in each preset time through a controller;
and obtaining a pressure fluctuation curve according to the pressure fluctuation value in the preset time and the pressure value corresponding to each preset time, wherein the pressure fluctuation curve is a curve of the pressure fluctuation value changing along with the pressure value.
Optionally, before receiving the power signal through the controller and outputting a voltage ramp signal to drive the test piece to act, the method further includes:
the controller is used for outputting an exhaust control instruction, the power supply module is used for receiving the exhaust control instruction and outputting a power supply signal, and the power supply signal is transmitted to the test piece through the controller to drive the test piece to act so as to exhaust.
Optionally, the test piece acts to drive the torque manager to act, the pressure sensor detects the pressure output by the torque manager in real time and outputs a pressure detection signal, and then the method further comprises,
and filtering the pressure detection signal sequentially through the low-pass filter and the high-pass filter to filter the static pressure signal and the dynamic pressure signal.
Optionally, the static pressure signal is a fluctuation signal supplied when the pressure sensor is powered on and pressure value acquisition is not performed, and an interference signal of an external electromagnetic environment; the dynamic pressure signal is a signal exceeding the frequency of pressure fluctuation generated by the test piece itself.
Optionally, the method for drawing the upper envelope curve and the lower envelope curve according to the pressure curve specifically includes,
acquiring the highest points of pressure curves in a plurality of preset times through a controller;
acquiring the lowest points of a plurality of pressure curves in preset time through a controller;
connecting the highest points of the pressure curves in a plurality of preset times through a controller, and drawing an upper envelope curve;
and connecting the lowest points of the pressure curves in the preset time through the controller, and drawing a lower envelope curve.
Optionally, the controller calculates a difference between the upper envelope curve and the lower envelope curve at the same time, and fits the difference to a time pressure fluctuation curve, and then the pressure fluctuation curve is processed by 1Hz low-pass filtering.
By adopting the technical scheme, the obtained time pressure fluctuation curve is subjected to low-pass filtering processing of 1Hz, signals higher than 1Hz are filtered, and the time pressure fluctuation curve can be conveniently read.
In summary, the present application includes at least one of the following beneficial technical effects:
1. the controller outputs a test starting instruction, the power supply module receives the test starting instruction and outputs a power supply signal, the controller receives the power supply signal and outputs a voltage climbing signal, the test piece receives the voltage climbing signal to act and drives the torque manager to act, the pressure sensor detects the pressure output by the action of the torque manager in real time and outputs a pressure detection signal, the controller receives the pressure detection signal and generates a pressure fluctuation curve, a pressure fluctuation signal is output, the display receives the pressure fluctuation signal and displays a pressure fluctuation value, and a worker can detect the pressure fluctuation value of the plunger pump under different pressure values through the pressure fluctuation test device in an online mode;
2. by designing the low-pass filter and the high-pass filter, the pressure detection signal can filter out a pressure curve formed after an interference signal in the pressure detection process sequentially passes through the low-pass filter and the high-pass filter, and the pressure curve can reflect the change of pressure better.
Drawings
Fig. 1 is a schematic overall structure diagram of a pressure fluctuation testing device of a hydraulic drive system provided by the present application.
FIG. 2 is a flow chart of a method for testing pressure fluctuations in a hydraulic drive system according to the present application.
FIG. 3 is a graph of voltage ramp signal output by the controller and pressure output by the torque manager over time.
Fig. 4 is a pressure curve, an upper envelope curve, a lower envelope curve, and a time pressure fluctuation curve.
Fig. 5 is a limit curve and a pressure fluctuation curve.
Description of reference numerals: 1. testing the tool; 11. turning over the bracket; 12. a rear axle; 13. a torque manager; 10. testing the system; 101. a controller; 102. a display device; 20. testing the piece; 30. a pressure sensor; 40. a power supply module; 50. a low-pass filter; 60. a high pass filter.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is further described in detail below with reference to fig. 1-5 and the embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
The embodiment of the application discloses a pressure fluctuation testing device of a hydraulic drive system. Referring to fig. 1, the pressure fluctuation testing device of the hydraulic drive system comprises a testing tool 1, a power supply module 40, a pressure sensor 30 and a testing system 10, wherein the testing tool 1 comprises a torque manager 13, a rear axle 12 and an overturning bracket 11, the torque manager 13 is connected with the rear axle 12 through a bolt, the torque manager 13 is fixedly installed on the overturning bracket 11 through the bolt, and a testing piece 20 is connected with the torque manager 13 through a bolt during testing. The test system 10 includes a display device 102 and a controller 101, wherein the controller 101 is connected to the test piece 20, the power supply module 40, the pressure sensor 30 and the display device 102 respectively. In this embodiment, the test piece 20 is a plunger pump with six plungers, and the control cable connector of the controller 101 is connected to the ECU connector of the plunger pump. The torque manager 13 and the rear axle 12 are common parts of an automobile, and the turning support 11 only needs to turn the torque manager 13 and the rear axle 12 in the detection, installation and disassembly processes, which is not described in detail herein.
The controller 101 is used for outputting a detection start signal, the power supply module 40 receives the detection start signal and outputs a power supply signal, the controller 101 receives the power supply signal and outputs a voltage climbing signal, the controller 101 transmits the voltage climbing signal to the plunger pump through CAN communication, the plunger pump receives the voltage climbing signal and starts to work to drive the torque manager 13 to act, and the pressure sensor 30 detects pressure output by the torque manager 13 and outputs a pressure detection signal.
The controller 101 receives the pressure detection signals, the multiple pressure detection signals are processed and calculated to form a pressure fluctuation curve, a display signal is output, and the display receives the display signal and displays the pressure fluctuation curve.
The pressure fluctuation testing device of the hydraulic driving system further comprises a low-pass filter 50 and a high-pass filter 60, the low-pass filter 50 is connected with the pressure sensor 30, the low-pass filter 50 is further connected with the high-pass filter 60, the high-pass filter 60 is further connected with the controller 101, pressure detection signals output by the pressure sensor 30 are sequentially processed by the low-pass filter 50 and the high-pass filter 60 and then transmitted to the controller 101, and therefore a more real pressure fluctuation curve is obtained.
The embodiment of the application discloses a pressure fluctuation testing method for a hydraulic drive system. Referring to fig. 2, the pressure fluctuation testing method of the hydraulic drive system includes:
s1: the controller 101 outputs a test start instruction, the power supply module 40 receives the test start instruction and outputs a power supply signal, and the controller 101 receives the power supply signal and outputs a voltage climbing signal to the plunger pump so as to drive the plunger pump to act.
Referring to fig. 3, the abscissa is time, the ordinate is pressure and voltage, the curve a is a voltage ramp signal curve representing a change in voltage input to the plunger pump with time, and the curve B is a pressure curve representing a change in pressure output from the plunger pump with time.
When the plunger pump is driven to act, a voltage climbing mode is adopted, in the embodiment, the voltage climbing rate is 0.18V/S, and the increasing rate of the pressure output by the plunger pump is 0.8bar/S at the time, namely, the output pressure of the plunger pump is increased by 0.8bar every time the voltage is increased by 0.18V. In other embodiments, the voltage ramp rate may be set according to practical situations, and is not limited herein.
S2: the plunger pump acts to drive the torque manager 13 to act, and the pressure sensor 30 detects the pressure output by the torque manager 13 in real time and outputs a pressure detection signal.
When pressure data is collected, interference signals such as power signals and external noise are generated. Theoretically, the frequency of the pressure fluctuation generated by the plunger pump in this embodiment is between 10Hz and 250Hz, so that the pressure detection signal needs to be filtered by the low pass filter 50 and the high pass filter 60 after step S2 to filter out the static pressure signal and the dynamic pressure signal, and then step S3 is performed. In this embodiment, the cut-off frequency of the low-pass filter 50 is 250Hz, the cut-off frequency of the high-pass filter 60 is 10Hz, and the pressure detection signal is processed by the low-pass filter 50 and the high-pass filter 60 to filter out static pressure signals and dynamic pressure signals with frequencies outside 10Hz to 250Hz, so that the collected pressure detection signal can accurately reflect the pressure output by the plunger pump. In this embodiment, the static pressure signal is a fluctuation signal of power supply and an interference signal of an external electromagnetic environment when the pressure sensor 30 is powered on and the pressure value is not collected, and the dynamic pressure signal is a signal exceeding the pressure fluctuation frequency generated by the plunger pump itself.
The cut-off frequencies of the high pass filter 60 and the low pass filter 50 can be determined according to the type and operating conditions of the plunger pump, and theoretically there are a minimum of 1 fluctuation and a maximum of 6 fluctuations for each rotation of the plunger pump. The plunger pump can be divided into 1 st order, 2 nd order, 3 rd order, 4 th order, 5 th order and 6 th order according to the fluctuation times, and the frequency of pressure fluctuation can be calculated according to the rotating speed of the plunger pump and used as the setting of the filtering threshold.
The specific calculation method is as follows: f = (r × n)/T, where f is the cutoff frequency, r is the rotational speed of the plunger pump, and n is the order of the plunger pump. And substituting the maximum value and the minimum value of the order into the formula, wherein the frequency obtained by two times of calculation is the threshold range of filtering.
Meanwhile, the sampling frequency of the pressure sensor 30 should be more than 2 times of the theoretical fluctuation frequency of the plunger pump, the sampling frequency of the pressure sensor 30 in this embodiment is 1KHz, in other embodiments, the sampling frequency of the pressure sensor 30 may be specifically set according to the fluctuation frequency of the plunger pump, as long as the sampling frequency is more than 2 times of the theoretical fluctuation frequency of the plunger pump, and the present invention is not limited herein.
S3: the controller 101 receives the pressure detection signal output by the pressure sensor 30 in real time to obtain a pressure curve, and draws an upper envelope curve and a lower envelope curve according to the pressure curve.
Referring to fig. 4, the abscissa is time, the ordinate is pressure, the curve C is a pressure curve, the curve D is an upper envelope curve, and the curve E is a lower envelope curve.
The method for drawing the upper envelope curve and the lower envelope curve comprises the following steps:
acquiring the highest points of pressure curves in a plurality of preset times through the controller 101;
acquiring the lowest points of a plurality of pressure curves in preset time through the controller 101;
connecting the highest points of the pressure curves in a plurality of preset times through the controller 101, and drawing an upper envelope curve;
and connecting the lowest points of the pressure curves in a plurality of preset times through the controller 101, and drawing a lower envelope curve.
In this embodiment, the preset time is 60ms, that is, the envelope signal length is 60 ms.
S4: calculating the difference value of the upper envelope curve and the lower envelope curve in a preset time through the controller 101, namely the maximum value of the pressure-the minimum value of the pressure in the same preset time period; and the difference value of the upper envelope curve and the lower envelope curve is a pressure fluctuation value, and a time pressure fluctuation curve is fitted according to the difference values of the upper envelope curve and the lower envelope curve in a plurality of preset times.
Referring to fig. 4, a time pressure fluctuation curve is a pressure fluctuation value variation curve with time, and a curve F is a time pressure fluctuation curve and represents a variation law of the pressure fluctuation value with time. To facilitate the reading of the time pressure fluctuation curve, a low pass filter 50 is used for processing, and the cut-off frequency is set to be 1 Hz.
S5: the corresponding pressure value for each preset time period is determined by the controller 101.
S6: the controller 101 obtains a pressure fluctuation curve according to the pressure fluctuation value within the preset time and the pressure value corresponding to each preset time.
In steps S5 and S6, specifically, the plunger pump is driven to operate in a voltage-rising manner, and the voltage rises in steps, that is, 0V for 0 voltage, 0.18V for 1S voltage, 0.36V for 2S voltage, … …, and so on. Therefore, the pressure value corresponding to 0S is 0bar, the pressure values corresponding to 1S are both 0.8bar, the pressure values corresponding to 2S are both 1.6 bar and … …, and so on. The preset time is 60ms, and the pressure value corresponding to each preset time period can be determined according to the rule.
It can be understood that, the number of the preset time periods contained in 1S =1000ms,1-2S (including 1 st S, not including 2 nd S) =1000ms/60ms, each preset time period corresponds to a pressure fluctuation value, and then, the average value of the 1-2S pressure fluctuation values is calculated in the following manner: the sum of the pressure fluctuation values corresponding to each preset time period of 1-2S/the number of the preset time periods contained in 1-2S; the result obtained is the corresponding pressure fluctuation value at 0.8 bar.
Referring to fig. 5, the abscissa is a pressure value output from the plunger pump, and the ordinate is a pressure fluctuation value. The curve G is a limit value curve and represents the upper limit of the pressure fluctuation value under different pressure values, the upper limit of the pressure fluctuation value can be set according to the use working condition of the plunger pump and the acceptable range of the noise, vibration and sound vibration roughness of the plunger pump on the whole vehicle, and different products can be designed with different upper limits without limitation. Each product corresponds to a limit curve according to the actual situation. The limiting curves in fig. 5 are only examples in different situations. Curve H is the pressure fluctuation curve, represents the pressure fluctuation value that corresponds under the different pressure values, in order to guarantee the accuracy of test, adopts multiple measurements, and this embodiment carries out five times and measures and all accord with the pressure fluctuation scope that the different pressure fluctuation curves of reacing, and plunger pump can be normal practical promptly. In other embodiments, the number of measurements may be set according to actual conditions, and is not limited herein.
Before the oil pressure fluctuation test is carried out, the plunger pump needs to be subjected to exhaust treatment, hydraulic oil is injected into the plunger pump, the controller 101 outputs an exhaust control instruction, the power supply module 40 receives the exhaust control instruction and outputs a power signal, the controller 101 receives the power signal and transmits the power signal to the plunger pump, the plunger pump acts to drive the hydraulic oil to flow, when the hydraulic oil passes through the pressure release valve, the hydraulic pressure is increased, and the pressure release valve is opened to discharge gas in the plunger pump. The plunger pump is subjected to exhaust treatment, so that a stable test environment can be obtained, and the influence of bubbles on a hydraulic fluctuation test is eliminated.
The operation condition of the plunger pump can be judged by detecting the pressure fluctuation of the plunger pump, the plunger pump operates more stably as the pressure fluctuation is smaller, and the plunger pump needs to be maintained or replaced when the pressure fluctuation exceeds a limit value.
The foregoing is a preferred embodiment of the present application and is not intended to limit the scope of the application in any way, and any features disclosed in this specification (including the abstract and drawings) may be replaced by alternative features serving equivalent or similar purposes, unless expressly stated otherwise. That is, unless expressly stated otherwise, each feature is only an example of a generic series of equivalent or similar features.
Claims (10)
1. The utility model provides a pressure oscillation testing arrangement of hydraulic drive system which characterized in that: the testing device comprises a testing tool (1), a power supply module (40), a pressure sensor (30) and a testing system (10), wherein the testing tool (1) comprises a torque manager (13), and the torque manager (13) is connected with a testing piece (20);
the testing system (10) comprises a controller (101), wherein the controller (101) is respectively connected with the power supply module (40) and the testing piece (20), the controller (101) outputs a testing start instruction, the power supply module (40) receives the testing start instruction and outputs a power supply signal, and the controller (101) receives the power supply signal and outputs a voltage climbing signal;
the test piece (20) receives the voltage climbing signal to drive the torque manager (13) to act, and the voltage climbing rate is 0.18V/S;
the pressure sensor (30) is used for detecting the pressure output by the torque manager (13) and outputting a pressure detection signal;
the test system (10) further comprises a display device (102), and the controller (101) is further respectively connected with the pressure sensor (30) and the display device (102); the controller (101) receives the pressure detection signal, generates a pressure fluctuation curve and outputs a display signal;
the display device (102) receives the display signal and displays a pressure fluctuation curve.
2. The pressure fluctuation testing apparatus of a hydraulic drive system according to claim 1, wherein: the pressure sensor is characterized by further comprising a low-pass filter (50) and a high-pass filter (60), wherein the low-pass filter (50) is connected with the pressure sensor (30), the high-pass filter (60) is connected with the low-pass filter (50), the high-pass filter (60) is further connected with the controller (101), and pressure detection signals output by the pressure sensor (30) are sequentially subjected to filtering processing of the low-pass filter (50) and the high-pass filter (60) and transmitted to the controller (101).
3. The pressure fluctuation testing apparatus of a hydraulic drive system according to claim 2, wherein: the cut-off frequency of the low-pass filter (50) is 250Hz, and the cut-off frequency of the high-pass filter (60) is 10 Hz.
4. The pressure fluctuation testing apparatus of a hydraulic drive system according to claim 1, wherein: the controller (101) transmits a voltage ramp signal to the test piece (20) through CAN communication.
5. A pressure fluctuation testing method of a hydraulic drive system, which is applied to the pressure fluctuation testing apparatus of a hydraulic drive system according to any one of claims 1 to 4, characterized in that: the method comprises the steps of (1) carrying out,
outputting a test starting instruction through a controller (101), receiving the test starting instruction by a power supply module (40), and outputting a power supply signal, receiving the power supply signal by the controller (101), and outputting a voltage climbing signal to drive the test piece (20) to act;
the test piece (20) acts to drive the torque manager (13) to act to output a pressure signal, and the pressure sensor (30) collects the pressure signal in real time to output a pressure detection signal;
the controller (101) receives the pressure detection signal in real time, generates a pressure curve, and draws an upper envelope curve and a lower envelope curve according to the pressure curve;
calculating the difference value of an upper envelope curve and a lower envelope curve in preset time through the controller (101), wherein the difference value of the upper envelope curve and the lower envelope curve is a pressure fluctuation value, and fitting the pressure fluctuation value into a time pressure fluctuation curve according to the difference value of the upper envelope curve and the lower envelope curve in a plurality of preset times, wherein the time pressure fluctuation curve is a curve of the pressure fluctuation value changing along with time;
determining a corresponding pressure value in each preset time through a controller (101);
and obtaining a pressure fluctuation curve according to the pressure fluctuation value in the preset time and the pressure value corresponding to each preset time, wherein the pressure fluctuation curve is a curve of the pressure fluctuation value changing along with the pressure value.
6. The hydraulic drive system pressure fluctuation testing method of claim 4, wherein: the method comprises the following steps that a controller (101) receives the power supply signal and outputs a voltage climbing signal to drive the test piece (20) to act, and the method further comprises the following steps:
an exhaust control instruction is output through a controller (101), the power supply module (40) receives the exhaust control instruction and outputs a power supply signal, and the power supply signal is transmitted to the test piece (20) through the controller (101) to drive the test piece (20) to act so as to exhaust.
7. The hydraulic drive system pressure fluctuation testing method of claim 4, wherein: the test piece (20) acts to drive the torque manager (13) to act, the pressure sensor (30) detects the pressure output by the torque manager (13) in real time and outputs a pressure detection signal, and then the test piece further comprises,
and filtering the pressure detection signal through the low-pass filter (50) and the high-pass filter (60) in sequence to filter the static pressure signal and the dynamic pressure signal.
8. The hydraulic drive system pressure fluctuation testing method of claim 6, wherein: the static pressure signal is a fluctuation signal of power supply when the pressure sensor (30) is electrified and pressure value collection is not carried out and an interference signal of an external electromagnetic environment; the dynamic pressure signal is a signal exceeding the frequency of pressure fluctuations generated by the test piece (20) itself.
9. The hydraulic drive system pressure fluctuation testing method of claim 4, wherein: the method of plotting an upper envelope curve and a lower envelope curve from said pressure curve particularly comprises,
acquiring the highest points of pressure curves in a plurality of preset times through a controller (101);
acquiring the lowest points of a plurality of pressure curves in preset time through a controller (101);
connecting the highest points of the pressure curves in a plurality of preset times through a controller (101) to draw an upper envelope curve;
and connecting the lowest points of the pressure curves in a plurality of preset times through a controller (101) to draw a lower envelope curve.
10. The hydraulic drive system pressure fluctuation testing method of claim 4, wherein: and calculating the difference value of the upper envelope curve and the lower envelope curve at the same time through the controller (101), and fitting the difference value into a time pressure fluctuation curve, and then processing the pressure fluctuation curve through 1Hz low-pass filtering.
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