CN114526926A - Pulse fatigue loading test method for pump valve cooperative control - Google Patents
Pulse fatigue loading test method for pump valve cooperative control Download PDFInfo
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- CN114526926A CN114526926A CN202210158439.1A CN202210158439A CN114526926A CN 114526926 A CN114526926 A CN 114526926A CN 202210158439 A CN202210158439 A CN 202210158439A CN 114526926 A CN114526926 A CN 114526926A
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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
- G01M17/00—Testing of vehicles
- G01M17/007—Wheeled or endless-tracked vehicles
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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
- G01M99/00—Subject matter not provided for in other groups of this subclass
- G01M99/002—Thermal testing
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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
- G01M99/00—Subject matter not provided for in other groups of this subclass
- G01M99/007—Subject matter not provided for in other groups of this subclass by applying a load, e.g. for resistance or wear testing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/32—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces
- G01N3/36—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces generated by pneumatic or hydraulic means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0001—Type of application of the stress
- G01N2203/001—Impulsive
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/003—Generation of the force
- G01N2203/0042—Pneumatic or hydraulic means
- G01N2203/0048—Hydraulic means
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
Abstract
The invention discloses a pulse fatigue loading test method for pump valve cooperative control. The loading test method comprises the following steps: the system comprises a valve control pressure pulse servo control subsystem, a pump control position servo control subsystem, a displacement sensor, an adjustable throttling hole, an asymmetric loading hydraulic cylinder, a pressure sensor and an automobile radiator workpiece. The pressure output by the asymmetric loading hydraulic cylinder is controlled by the valve control pressure pulse servo control subsystem, so that the fatigue test is carried out on the automobile radiator workpiece; the piston displacement of the asymmetric loading hydraulic cylinder is controlled by the pump control position servo control subsystem, so that the cylinder collision risk in the pulse fatigue loading test process is prevented. The invention realizes the pressure and displacement control of the pulse fatigue loading test equipment at the same time, and has the characteristics of safety, stability, high efficiency and high test precision.
Description
Technical Field
The invention belongs to the field of industrial application, and particularly relates to a pulse fatigue loading test method for pump-valve cooperative control for testing the fatigue performance of an automobile radiator.
Background
The automobile radiator is commonly called as automobile water tank and is an important part in an automobile engine cooling system. The performance of the radiator directly influences the heat dissipation effect, dynamic property, economy and reliability of the automobile engine, and even normal work and driving safety. In the working process of an engine, high-temperature refrigerating fluid (water glycol solution) flowing in the radiator can corrode and corrode the radiator, and the flowing of the refrigerating fluid can generate periodic pressure vibration so as to influence the performance of the radiator. With the development of the automobile industry, higher requirements are put forward on the working conditions of the radiator. Therefore, the fatigue performance of the radiator is tested through the pulse fatigue loading test, and the fatigue evaluation of the automobile radiator is very necessary.
The sealing structure adopted by the loading cylinder of the existing automobile radiator pulse fatigue loading test equipment is mostly contact sealing, namely, the piston and the cylinder wall of the loading cylinder are in contact sealing through a sealing ring. The contact type sealing structure can cause the starting friction force of the loading cylinder to be large, and the real fatigue performance of the radiator in a low-pressure environment is difficult to test. In addition, due to the creep property of the hydraulic cylinder, in the loading test process, the piston of the hydraulic cylinder can move forwards slowly, and the risk of cylinder collision is caused for a long time.
Disclosure of Invention
Aiming at the problems and the defects of the existing pulse fatigue loading test method, the invention improves the precision of the pulse fatigue loading test of the automobile radiator, eliminates the cylinder collision risk of the existing pulse fatigue loading test method in a long-time test environment, and provides the pump valve cooperative control pulse fatigue loading test method with safe and stable operation, high efficiency and high test precision.
In order to achieve the above purpose, the invention provides the following scheme: a pulse fatigue loading test method for pump valve cooperative control comprises the following steps: the system comprises a valve control pressure pulse servo control subsystem, an adjustable orifice, an asymmetric loading hydraulic cylinder and a pressure sensor;
the valve control pressure pulse servo control subsystem specifically comprises: the device comprises a pressure pulse signal generator, a pressure controller, a loading servo valve, a hydraulic power source and a first oil tank; the pressure pulse signal generator is connected with the input end of the pressure controller, the feedback end of the pressure controller is connected with the pressure sensor, and the output end of the pressure controller is connected with the electromagnet of the loading servo valve; the loading servo valve is provided with P, T, A working oil ports and B working oil ports, a P port of the loading servo valve is connected with the hydraulic power source, a T port of the loading servo valve is connected with the first oil tank, an A port of the loading servo valve is connected with an A cavity of the asymmetric loading hydraulic cylinder through an oil way, and a B port of the loading servo valve is connected with a B cavity of the asymmetric loading hydraulic cylinder through an oil way;
the asymmetric loading hydraulic cylinder comprises A, B, C and D four cavities, the diameters of piston rods of the cavity A, the cavity B and the cavity C are the same, a gap is sealed between a piston of the cavity D and a cylinder wall, the media of the cavity A and the cavity B of the asymmetric loading hydraulic cylinder are hydraulic oil, the loading media of the cavity C and the cavity D are refrigerating fluid, the cavity D of the asymmetric loading hydraulic cylinder is connected with the automobile radiator workpiece through an oil way, and the cavity C of the asymmetric loading hydraulic cylinder is connected with the cavity D of the asymmetric loading hydraulic cylinder through the adjustable flow hole; the pressure sensor is arranged at an outlet of the D cavity of the asymmetric loading hydraulic cylinder and is used for detecting a pressure electric signal output by the outlet of the D cavity of the asymmetric loading hydraulic cylinder. The automobile radiator workpiece is a common automobile radiator, and a loading medium in the workpiece is refrigerating fluid (water glycol solution). The pressure output by the asymmetric loading hydraulic cylinder is controlled by the valve control pressure pulse servo control subsystem, so that the fatigue test is performed on the automobile radiator workpiece, and the sealing structure of the loading hydraulic cylinder of the pulse fatigue loading test equipment is changed, so that the precision of the pulse fatigue loading test of the automobile radiator is improved.
The above pulse fatigue loading test method for pump and valve cooperative control further includes a pump control position servo control subsystem and a displacement sensor, where the pump control position servo control subsystem specifically includes: the first safety valve, the second oil tank, the second safety valve, the gear pump, the servo motor, the position controller and the position signal generator are arranged on the oil tank; the gear pump has PAAnd PBTwo working oil ports, P of the gear pumpAThe oil port is asymmetrical to the oil passageThe cavities A of the loading hydraulic cylinders are connected, and the P of the gear pumpBThe oil port is connected with the cavity B of the asymmetric loading hydraulic cylinder through an oil way; the first safety valve and the second safety valve are connected in series in reverse direction and then connected to P of the gear pumpAOil port and PBThe second oil tank is connected between the oil ports and oil outlets of the first safety valve and the second safety valve; the output shaft of the servo motor is mechanically connected with the input shaft of the gear pump; the position signal generator is connected with the input end of the position controller, the feedback end of the position controller is connected with the displacement sensor, and the output end of the position controller is connected with the control end of the servo motor; the displacement sensor is arranged on a piston rod of the asymmetric loading hydraulic cylinder, wherein the cavity B of the asymmetric loading hydraulic cylinder is connected with the cavity C of the asymmetric loading hydraulic cylinder, and is used for detecting a position electric signal output by the asymmetric loading hydraulic cylinder.
When the system carries out the pulse fatigue loading test, the control mode of the pump control position servo control subsystem is as follows: the position signal generator generates a position instruction, the instruction input end of the position controller receives the position instruction generated by the position signal generator, the instruction feedback end of the position controller receives a position signal of the asymmetric loading hydraulic cylinder fed back by the displacement sensor, the position controller generates a speed control signal based on a corresponding control algorithm to control the rotating speed of the servo motor, and further control the displacement of the gear pump, so that the flow of hydraulic oil flowing into/out of the cavity A and the cavity B of the asymmetric loading hydraulic cylinder is controlled, the piston displacement of the asymmetric loading hydraulic cylinder is further controlled, the piston displacement of the asymmetric loading hydraulic cylinder is ensured to be close to the position instruction generated by the position signal generator, large offset does not occur, and the risk of cylinder collision under a long-time test environment is eliminated.
The pulse fatigue loading test method with the pump and valve cooperative control comprises the steps of pre-charging an asymmetric loading hydraulic cylinder before pulse fatigue loading test is carried out on an automobile radiator workpiece, specifically, generating a triangular wave position command by a position signal generator, receiving the position command generated by the position signal generator by a command input end of a position controller, receiving a position signal of a piston of the asymmetric loading hydraulic cylinder fed back by a displacement sensor by a command feedback end of the position controller, generating a speed control signal by the position controller based on a corresponding control algorithm, controlling the rotating speed of a servo motor, further controlling the discharge capacity of a gear pump, realizing control over the flow of hydraulic oil flowing into/out of an A cavity and a B cavity of the asymmetric loading hydraulic cylinder, further controlling the displacement of the piston of the asymmetric loading hydraulic cylinder, and further controlling the piston of the asymmetric loading hydraulic cylinder to move from the bottom end to the top end and then back to the bottom end, the good performance of the asymmetric loading hydraulic cylinder is ensured.
According to the pulse fatigue loading test method for pump valve cooperative control, the clearance between the piston of the D cavity and the cylinder wall of the asymmetric loading hydraulic cylinder is 1 wire.
According to the pulse fatigue loading test method under the cooperative control of the pump and the valve, the gear pump of the servo control subsystem at the pump control position is a universal symmetrical hydraulic pump.
Compared with the prior art, the invention has the beneficial effects that:
the invention provides a pulse fatigue loading test method for pump-valve cooperative control, which improves the precision of the pulse fatigue loading test of an automobile radiator by changing the sealing structure of a loading hydraulic cylinder of pulse fatigue loading test equipment; by introducing the pump control position servo control subsystem, the control can be provided and corrected when a loading hydraulic cylinder of the pulse fatigue loading test equipment is far away from a set position, and the damage to the equipment and the automobile radiator workpiece caused by other extreme conditions such as cylinder collision and the like is avoided. The invention realizes the pressure and displacement control of the pulse fatigue loading test equipment at the same time, and has the characteristics of safety, stability, high efficiency and high test precision.
Drawings
FIG. 1 is a hydraulic schematic diagram of a pulse fatigue loading test method for pump-valve cooperative control according to the present invention; in the figure, 1-a pressure pulse signal generator, 2-a pressure controller, 3-a loading servo valve, 4-a hydraulic power source, 5-a first oil tank, 6-a first safety valve, 7-a second oil tank, 8-a second safety valve, 9-a gear pump, 10-a servo motor, 11-a position controller, 12-a position signal generator, 13-a displacement sensor, 14-an adjustable orifice, 15-an asymmetric loading hydraulic cylinder, 16-a pressure sensor and 17-an automobile radiator workpiece.
Fig. 2-7 are a graph of the tracking effect of the instruction signal and the pressure signal at the outlet of the D cavity of the asymmetric loading hydraulic cylinder acquired by the pressure sensor when the AMESim simulation platform builds a corresponding hydraulic system and the pressure pulse signal generator generates instruction signals with different frequencies, different amplitudes and different types according to the design scheme of the present invention, and a piston displacement curve of the asymmetric loading hydraulic cylinder acquired by the displacement sensor.
FIG. 2 is a graph showing the tracking effect of a sinusoidal command signal of 0.1-2bar-1Hz generated by a pressure pulse signal generator under the control of a valve-controlled pressure pulse servo control subsystem on the command signal and a pressure signal collected by a pressure sensor at the outlet of a D cavity of an asymmetric loading hydraulic cylinder.
FIG. 3 is a piston displacement curve of the asymmetric loading hydraulic cylinder acquired by the displacement sensor under the control of the pump control position servo control subsystem when the pressure pulse signal generator generates a sinusoidal command signal of 0.1-2bar-1 Hz.
FIG. 4 is a graph showing the following effect of a sinusoidal command signal of 0.1-4bar-2Hz generated by a pressure pulse signal generator and a pressure signal at the outlet of a D cavity of an asymmetric loading hydraulic cylinder collected by a pressure sensor under the control of a valve-controlled pressure pulse servo control subsystem.
FIG. 5 is a piston displacement curve of the asymmetric loading hydraulic cylinder acquired by the displacement sensor under the control of the pump control position servo control subsystem when the pressure pulse signal generator generates a sinusoidal command signal of 0.1-4bar-2 Hz.
FIG. 6 is a graph showing the following effect of a trapezoidal command signal of 0.1-4bar-1Hz generated by a pressure pulse signal generator and a pressure signal at the outlet of a D cavity of an asymmetric loading hydraulic cylinder collected by a pressure sensor under the control of a valve-controlled pressure pulse servo control subsystem.
FIG. 7 is a piston displacement curve of the asymmetric loading hydraulic cylinder acquired by the displacement sensor under the control of the pump control position servo control subsystem when the pressure pulse signal generator generates a trapezoidal command signal of 0.1-4bar-1 Hz.
Detailed Description
The invention is further explained below with reference to the drawings.
The invention aims to provide a pulse fatigue loading test method for pump-valve cooperative control, which improves the precision of the pulse fatigue loading test of an automobile radiator and eliminates the risk of cylinder collision possibly caused in the process of the pulse fatigue loading test.
As shown in fig. 1, a method for testing pulse fatigue loading of pump and valve cooperative control includes: the system comprises a valve control pressure pulse servo control subsystem, a pump control position servo control subsystem, a displacement sensor 13, an adjustable orifice 14, an asymmetric loading hydraulic cylinder 15, a pressure sensor 16 and an automobile radiator workpiece 17.
The valve-controlled pressure pulse servo control subsystem is composed of a pressure pulse signal generator 1, a pressure controller 2, a loading servo valve 3, a hydraulic power source 4 and a first oil tank 5, wherein the pressure pulse signal generator 1 can generate various loading instruction signals of sine, trapezoid, multistage, triangle and the like according to specific requirements; the pressure pulse signal generator 1 is connected with an input end ("+") end of the pressure controller 2, a feedback end ("-") end of the pressure controller 2 is connected with the pressure sensor 16, and an output end of the pressure controller 2 is connected with the electromagnet of the loading servo valve 3; the loading servo valve 3 is provided with P, T, A working oil ports and B working oil ports, a P port of the loading servo valve 3 is connected with the hydraulic power source 4, a T port of the loading servo valve 3 is connected with the first oil tank 5, an A port of the loading servo valve 3 is connected with an A cavity of the asymmetric loading hydraulic cylinder 15 through an oil way, and a B port of the loading servo valve 3 is connected with a B cavity of the asymmetric loading hydraulic cylinder 15 through an oil way;
the pump control position servo control subsystem is composed of a first safety valve 6, a second oil tank 7, a second safety valve 8, a gear pump 9, a servo motor 10, a position controller 11 and a position signal generator 12, wherein the gear pump 9 is provided with PAAnd PBTwo working oil ports, P of gear pump 9AThe oil port is connected with the cavity A of the asymmetric loading hydraulic cylinder 15 through an oil way, and the P of the gear pump 9BHydraulic cylinder with oil port passing through oil path and asymmetric loading15 are connected with the cavity B; the first safety valve 6 and the second safety valve 8 are connected in series in reverse and then connected with the P of a gear pump 9AOil port and PBThe second oil tank 7 is connected between the oil ports and is connected with oil outlets of the first safety valve 6 and the second safety valve 8; the output shaft of the servo motor 10 is mechanically connected with the input shaft of the gear pump 9; the position signal generator 12 is connected with an input end ("+") end of the position controller 11, a feedback end ("-") end of the position controller 11 is connected with the displacement sensor 13, and an output end of the position controller 11 is connected with a control end of the servo motor 10;
the asymmetrical loading hydraulic cylinder 15 comprises A, B, C and D four chambers, wherein the cavity A of the asymmetrical loading hydraulic cylinder 15 is respectively communicated with the port A of the loading servo valve 3 and the port P of the gear pump 9 through oil passagesAThe oil ports are connected, and the cavity B of the asymmetric loading hydraulic cylinder 15 is respectively connected with the port B of the loading servo valve 3 and the port P of the gear pump 9 through oil pathsBThe oil ports are connected, the D cavity of the asymmetrical loading hydraulic cylinder 15 is connected with an automobile radiator workpiece 17 through an oil way, and the C cavity of the asymmetrical loading hydraulic cylinder 15 is connected with the D cavity of the asymmetrical loading hydraulic cylinder 15 through an adjustable orifice 14; the displacement sensor 13 is arranged on a piston rod of the asymmetric loading hydraulic cylinder 15, wherein the cavity B is connected with the cavity C, and is used for detecting a position electric signal output by the asymmetric loading hydraulic cylinder 15; the pressure sensor 16 is arranged at the outlet of the D cavity of the asymmetric loading hydraulic cylinder 15 and is used for detecting a pressure electric signal at the outlet of the D cavity of the asymmetric loading hydraulic cylinder 15.
The pressure pulse signal of the pressure pulse signal generator 1 and the position signal of the position signal generator 12 can be generated by the control of an upper computer at a PC end, the pressure controller 2 and the position controller 11 adopt a simple PID control algorithm, the loading servo valve 3 adopts a high-frequency response flow servo valve, the first safety valve 6 and the second safety valve 8 adopt overflow valves, the gear pump 9 adopts a gear pump with a fixed displacement, the servo motor 10 adopts an alternating current servo motor, the asymmetric loading hydraulic cylinder 15 adopts an asymmetric single booster cylinder, the media of the cavity A and the cavity B of the asymmetric loading hydraulic cylinder 15 are hydraulic oil, the media of the cavity C and the cavity D are refrigerating fluid (water glycol solution), the displacement sensor 13 adopts a magnetostrictive displacement sensor, the pressure sensor 16 adopts a piezoresistive pressure sensor, and the loading medium in the automobile radiator workpiece 17 is refrigerating fluid (water glycol solution).
In order to meet the requirements of safety and loading, before the pulse fatigue loading test is performed on the automobile radiator workpiece 17, the asymmetric loading hydraulic cylinder 15 is pre-charged, specifically, a position signal generator 12 generates a triangular wave position command, a command input end ("+" end) of the position controller 11 receives the position command generated by the position signal generator 12, a command feedback end ("-" end) of the position controller 11 receives a position signal of the piston of the asymmetric loading hydraulic cylinder 15 fed back by the displacement sensor 13, the position controller 11 generates a speed control signal based on a corresponding control algorithm (PID control algorithm), controls the rotation speed of the servo motor 10, further controls the displacement of the gear pump 9, controls the flow of hydraulic oil flowing into/out of the cavity a and the cavity B of the asymmetric loading hydraulic cylinder 15, and further controls the displacement of the piston of the asymmetric loading hydraulic cylinder 15, thereby controlling the piston of the asymmetric loading hydraulic cylinder 15 to move from the bottom end to the top end and then return to the bottom end, and ensuring the good performance of the asymmetric loading hydraulic cylinder 15.
When the system carries out the impulse fatigue loading test, the control mode of the valve control pressure impulse servo control subsystem is as follows: a pressure command signal which is expected to be tracked is generated by the pressure pulse signal generator 1, a command input end ("+" end) of the pressure controller 2 receives the pressure command signal which is expected to be tracked and generated by the pressure pulse signal generator 1, a command feedback end ("-" end) of the pressure controller 2 receives a pressure signal at an outlet of a D cavity of the asymmetrical loading hydraulic cylinder 15 which is fed back by the pressure sensor 16, the pressure controller 2 generates a control signal based on a corresponding control algorithm (PID control algorithm), the control of the flow rate of the hydraulic oil flowing into/out of the chamber a and the chamber B of the asymmetric loading hydraulic cylinder 15 is realized by controlling the displacement of the spool of the loading servo valve 3, further, the pressure at the outlet of the cavity D of the asymmetric loading hydraulic cylinder 15 is controlled, so that the pressure value of the refrigerating fluid (water glycol solution) flowing into the automobile radiator workpiece 17 can well track the expected tracking command signal generated by the pressure pulse signal generator 1.
When the system carries out the pulse fatigue loading test, the control mode of the pump control position servo control subsystem is as follows: a position command is generated by the position signal generator 12, a command input end ("+" end) of the position controller 11 receives the position command generated by the position signal generator 12, a command feedback end ("-" end) of the position controller 11 receives a position signal of the asymmetric loading hydraulic cylinder 15 fed back by the displacement sensor 13, the position controller 11 generates a speed control signal based on a corresponding control algorithm (PID control algorithm) to control the rotating speed of the servo motor 10, further, the displacement of the gear pump 9 is controlled to control the flow rates of the hydraulic oil flowing into and out of the chamber a and the chamber B of the asymmetric loading hydraulic cylinder 15, and the piston displacement of the asymmetric loading hydraulic cylinder 15 is further controlled to ensure that the piston displacement of the asymmetric loading hydraulic cylinder 15 does not greatly deviate in the vicinity of the position command generated by the position signal generator 12.
In the above embodiment of the present invention, the valve-controlled pressure pulse servo control subsystem and the pump-controlled position servo control subsystem operate respectively, and simultaneously control the flow rates of the hydraulic oil flowing into/out of the cavity a and the cavity B of the asymmetric loading hydraulic cylinder 15, thereby realizing the control of the pressure at the outlet of the cavity D of the asymmetric loading hydraulic cylinder 15 and the piston displacement of the asymmetric loading hydraulic cylinder 15. The valve control pressure pulse servo control subsystem plays a main control role, and the pump control position servo control subsystem plays an auxiliary control role.
By adjusting the opening of the adjustable orifice 14, the negative pressure generated in the cavity C of the asymmetric loading hydraulic cylinder 15 during the pulse fatigue loading test can be avoided.
Fig. 2, 4 and 6 show the tracking effect of the command signal (solid line) and the pressure signal (dotted line) at the outlet of the D-chamber of the asymmetrically loaded hydraulic cylinder 15 collected by the pressure sensor 16 when the pressure pulse signal generator 1 generates the command signals with different frequencies, different amplitudes and different types. As can be seen from the trace effect graph: for different command signals, under the control of the valve control pressure pulse servo control subsystem, the tracking pressure curve of the scheme of the invention can reach the peak value and the trough value of the command signals, and has good tracking effect and no distortion of the curve.
Fig. 3, 5 and 7 show piston displacement curves of the asymmetrically loaded hydraulic cylinder 15, which are acquired by the displacement sensor 13 when the pressure pulse signal generator 1 generates different frequencies, different amplitudes and different types of command signals. As can be seen from the trace effect graph: for different working conditions, under the control of the pump control position servo control subsystem, the piston displacement curve of the asymmetric loading hydraulic cylinder 15 is kept stable and does not deviate.
Claims (5)
1. A pulse fatigue loading test method for pump valve cooperative control is characterized by comprising the following steps: the system comprises a valve-controlled pressure pulse servo control subsystem, an adjustable orifice (14), an asymmetric loading hydraulic cylinder (15) and a pressure sensor (16);
the valve control pressure pulse servo control subsystem specifically comprises: the device comprises a pressure pulse signal generator (1), a pressure controller (2), a loading servo valve (3), a hydraulic power source (4) and a first oil tank (5); the pressure pulse signal generator (1) is connected with the input end of the pressure controller (2), the feedback end of the pressure controller (2) is connected with the pressure sensor (16), and the output end of the pressure controller (2) is connected with the electromagnet of the loading servo valve (3); the loading servo valve (3) is provided with P, T, A working oil ports and B working oil ports, a P port of the loading servo valve (3) is connected with the hydraulic power source (4), a T port of the loading servo valve (3) is connected with the first oil tank (5), an A port of the loading servo valve (3) is connected with an A cavity of the asymmetric loading hydraulic cylinder (15) through an oil way, and a B port of the loading servo valve (3) is connected with a B cavity of the asymmetric loading hydraulic cylinder (15) through an oil way;
the asymmetrical loading hydraulic cylinder (15) comprises A, B, C and D four cavities, piston rods of a cavity A, a cavity B and a cavity C are the same in diameter, a gap is sealed between a piston of the cavity D and a cylinder wall, media of the cavity A and the cavity B of the asymmetrical loading hydraulic cylinder (15) are hydraulic oil, loading media of the cavity C and the cavity D are refrigerating fluid, the cavity D of the asymmetrical loading hydraulic cylinder is connected with the automobile radiator workpiece (17) through an oil way, and the cavity C of the asymmetrical loading hydraulic cylinder is connected with the cavity D of the asymmetrical loading hydraulic cylinder through the adjustable flow hole (14); the pressure sensor (16) is arranged at the outlet of the cavity D of the asymmetric loading hydraulic cylinder and is used for detecting a pressure electric signal output by the outlet of the cavity D of the asymmetric loading hydraulic cylinder.
2. The pump-valve cooperative control pulse fatigue loading test method according to claim 1, characterized in that: still include pump accuse position servo control subsystem and displacement sensor (13), pump accuse position servo control subsystem specifically includes: the device comprises a first safety valve (6), a second oil tank (7), a second safety valve (8), a gear pump (9), a servo motor (10), a position controller (11) and a position signal generator (12); the gear pump (9) has PAAnd PBTwo working oil ports, P of the gear pump (9)AThe oil port is connected with the cavity A of the asymmetric loading hydraulic cylinder (15) through an oil way, and the P of the gear pump (9)BThe oil port is connected with the cavity B of the asymmetric loading hydraulic cylinder (15) through an oil way; the first safety valve (6) and the second safety valve (8) are connected in series in reverse and then connected with the P of a gear pump (9)AOil port and PBThe second oil tank (7) is connected between the oil ports and is connected with oil outlets of the first safety valve (6) and the second safety valve (8); the output shaft of the servo motor (10) is mechanically connected with the input shaft of the gear pump (9); the position signal generator (12) is connected with the input end of the position controller (11), the feedback end of the position controller (11) is connected with the displacement sensor (13), and the output end of the position controller (11) is connected with the control end of the servo motor (10); and the displacement sensor (13) is arranged on a piston rod of the asymmetric loading hydraulic cylinder, wherein the cavity B is connected with the cavity C, and is used for detecting a position electric signal output by the asymmetric loading hydraulic cylinder.
3. The pump-valve cooperative control pulse fatigue loading test method according to claim 2, characterized in that: before a workpiece (17) of an automobile radiator is subjected to a pulse fatigue loading test, an asymmetric loading hydraulic cylinder (15) is pre-charged, specifically, a position signal generator (12) generates a triangular wave position instruction, an instruction input end of a position controller (11) receives the position instruction generated by the position signal generator (12), an instruction feedback end of the position controller (11) receives a position signal of a piston of the asymmetric loading hydraulic cylinder (15) fed back by a displacement sensor (13), the position controller (11) generates a speed control signal based on a corresponding control algorithm, controls the rotating speed of a servo motor (10) and further controls the displacement of a gear pump (9), realizes the control of the flow of hydraulic oil flowing into/out of an A cavity and a B cavity of the asymmetric loading hydraulic cylinder (15), and further controls the displacement of the piston of the asymmetric loading hydraulic cylinder (15), thereby controlling the piston of the asymmetric loading hydraulic cylinder (15) to move from the bottom end to the top end and then return to the bottom end, and ensuring the good performance of the asymmetric loading hydraulic cylinder (15).
4. A pump-valve cooperative control impulse fatigue loading test method according to claim 1, 2 or 3, characterized in that: a clearance between a piston of a cavity D and a cylinder wall of the asymmetric loading hydraulic cylinder is 1 wire.
5. A pump-valve cooperative control impulse fatigue loading test method according to claim 2 or 3, characterized in that: and a gear pump (9) of the pump control position servo control subsystem is a general symmetrical hydraulic pump.
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| CN116973094A (en) * | 2023-08-01 | 2023-10-31 | 武汉万曦智能科技有限公司 | Automatic test control system for safety valve |
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| CN114526926B (en) | 2023-06-16 |
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