Import guide vane electro-hydraulic servo system seismic test device and method

Abstract

This invention discloses a vibration resistance testing device and method for an imported guide vane electro-hydraulic servo system. The device includes an electro-hydraulic servo system connected to a servo hydraulic cylinder, which is fixedly mounted on a rotatable test platform. The rotatable test platform is mounted on a vibration platform bracket. Vibration motors are mounted on both sides of the rotatable test platform and fixedly connected to the vibration platform bracket. A rigid spring connects the vibration platform bracket to a fluid tank. A cylinder support is fixedly connected to a base and installed in front of the fluid tank. A high-pressure cylinder and an impact rod are mounted on the same axis as the fluid tank. A rigid spring connects the vibration platform bracket to the vibration platform lower bracket. This invention uses a composite excitation device combining mechanical vibration and fluid excitation to simulate mechanical vibration between mechanical structures and fluid vibration caused by airflow during operation. It can perform single vibration tests as well as composite vibration tests under complex working conditions, verifying and optimizing the service performance of the electro-hydraulic servo system in vibration environments.

Description

Technical Field

[0001] This invention belongs to the field of automatic control of gas turbine inlet guide vanes, and particularly relates to a vibration resistance testing device and method for an electro-hydraulic servo system for inlet guide vanes. Background Technology

[0002] In practical use, the intake airflow of an IGV system often becomes turbulent due to temperature and flow velocity, causing surge in the entire system. Furthermore, during gas turbine operation, impeller rotation can also generate vibrations due to rotor imbalance or changes in bearing lubrication conditions. The inlet guide vane electro-hydraulic servo system is affected, resulting in longer response times and reduced position control accuracy, which in turn affects the functionality of the temperature and pressure ratio limiting modules, leading to poor temperature control and decreased unit operating efficiency. It may also cause the IGV to fail to reach the specified opening degree; when the cumulative deviation between the actual opening degree and the opening command reaches a certain limit, it will cause the gas turbine unit to trip. Therefore, the reliability of the electro-hydraulic servo system in vibration environments is particularly important, necessitating the design of vibration testing equipment to verify and optimize the performance of the electro-hydraulic servo system under vibration conditions.

[0003] For example, the invention patent with patent application number CN201410842382.2 discloses a centrifuge vibration table. This design allows the bearing platform to move according to the required degrees of freedom while simultaneously constraining other degrees of freedom, ensuring linear constraint of the test platform and improving the response accuracy of the centrifuge vibration table. However, the aforementioned testing device can only perform mechanical vibration measurements, and the mechanical vibration direction is unidirectional. In actual working conditions, the inlet guide vane system is affected by temperature and flow velocity, and the intake airflow often forms turbulence, causing the entire system to surge. Fluid excitation is also an important component of vibration testing. Summary of the Invention

[0004] The purpose of this invention is to provide a vibration resistance testing device and method for an imported guide vane electro-hydraulic servo system, in order to solve the above-mentioned technical problems.

[0005] To solve the above-mentioned technical problems, the specific technical solution of the shock resistance testing device and method for the imported guide vane electro-hydraulic servo system of the present invention is as follows:

[0006] A vibration resistance testing device for an imported guide vane electro-hydraulic servo system includes an electro-hydraulic servo system connected to a servo hydraulic cylinder via a cable. The servo hydraulic cylinder provides a carrier for the electro-hydraulic servo system. The servo hydraulic cylinder is fixedly mounted on a rotatable test bench, which is mounted on a vibration table bracket. Vibration motors are mounted on both sides of the rotatable test bench and fixedly connected to the vibration table bracket. The vibration table bracket is fixedly connected to a fluid tank using a rigid spring. A cylinder support is fixedly connected to a base and installed in front of the fluid tank. A high-pressure cylinder and an impact rod are mounted on the same axis as the fluid tank. The vibration table bracket and the vibration table lower bracket are connected by a rigid spring to achieve up-and-down vibration of the vibration table.

[0007] Furthermore, the rotatable test stand can be manually rotated to change the angle of the piston rod axis of the servo hydraulic cylinder.

[0008] Furthermore, the servo hydraulic cylinder is fixedly mounted on the support, and the support is fixedly connected to the rotatable test bench by bolts.

[0009] Furthermore, it includes a cylinder cover, wherein the cylinder support and the cylinder cover are bolted together for fixing the high-pressure cylinder.

[0010] Furthermore, different media can be replaced in the fluid tank to achieve fluid vibration transmitted to the servo hydraulic cylinder via a spring, simulating fluid vibration caused by gas turbulence under actual working conditions.

[0011] Furthermore, the medium is gas or hydraulic fluid.

[0012] Furthermore, a protective rod is included, which is fixedly installed at the rear of the fluid tank, and anti-collision rubber is installed between the front end of the protective rod and the rear wall of the fluid tank for cushioning.

[0013] Furthermore, the test slide is installed in the groove of the rotatable test platform and is hinged to the piston rod of the servo hydraulic cylinder to simulate the operating damping of the servo hydraulic cylinder under actual working conditions.

[0014] This invention also discloses a vibration resistance test method for an imported guide vane electro-hydraulic servo system, comprising the following steps:

[0015] Step 1: Start the electro-hydraulic servo system under test and test whether the electro-hydraulic servo system can correctly control the servo hydraulic cylinder. By controlling the electro-hydraulic servo valve through the system, the system pressure of the hydraulic circuit is adjusted to realize the reciprocating motion of the piston rod of the servo hydraulic cylinder and test whether the servo hydraulic cylinder can operate normally.

[0016] Step 2: Rotate the rotatable test platform to keep the piston rod axis of the servo hydraulic cylinder perpendicular to the vibration motor and lock the rotatable test platform. Connect the power supply and start the vibration motor to start the electro-hydraulic servo system under test to control the reciprocating motion of the servo hydraulic cylinder. Collect the displacement curve of the servo hydraulic cylinder and compare it with the displacement curve of the servo hydraulic cylinder when there is no vibration to test the anti-interference of the electro-hydraulic servo system.

[0017] Step 3: Reset the device, rotate the rotatable test platform to ensure the piston rod axis of the servo hydraulic cylinder is perpendicular to the fluid tank axis and lock it in place. Start the high-pressure cylinder; the piston of the high-pressure cylinder strikes the impact rod, which in turn strikes the rubber at the front of the fluid tank, causing vibration in the fluid tank. Simultaneously, start the electro-hydraulic servo system to control the reciprocating motion of the servo hydraulic cylinder, collect the displacement curve of the servo hydraulic cylinder, and compare it with the displacement curve of the servo hydraulic cylinder without vibration to test the anti-interference capability of the electro-hydraulic servo system.

[0018] Step 4: Reset the device, rotate the rotatable test platform to keep the piston rod axis of the servo hydraulic cylinder parallel to the fluid tank axis and lock it, start the high-pressure cylinder to run, the piston of the high-pressure cylinder hits the impact rod, the impact rod hits the front rubber of the fluid tank, the medium in the fluid tank is excited and vibrates, at the same time the test electro-hydraulic servo system is started to control the reciprocating motion of the servo hydraulic cylinder, collect the displacement curve of the servo hydraulic cylinder, and compare it with the displacement curve of the servo hydraulic cylinder when there is no vibration to test the anti-interference of the electro-hydraulic servo system;

[0019] Step 5: Reset the device, rotate the rotatable test platform to keep the piston rod axis of the servo hydraulic cylinder parallel to the vibration motor and lock the rotatable test platform, connect the power supply to start the vibration motor, start the electro-hydraulic servo system under test to control the reciprocating motion of the servo hydraulic cylinder, collect the displacement curve of the servo hydraulic cylinder, compare it with the displacement curve of the servo hydraulic cylinder when there is no vibration, and test the anti-interference of the electro-hydraulic servo system.

[0020] Step 6: Reset the device, rotate the rotatable test platform to keep the piston rod axis of the servo hydraulic cylinder parallel to the vibration motor and lock the rotatable test platform; first connect the power supply to start the vibration motor, start the electro-hydraulic servo system under test to control the servo hydraulic cylinder to reciprocate, start the high-pressure cylinder to strike the fluid tank to form fluid excitation, collect the displacement curve of the servo hydraulic cylinder, compare it with the displacement curve of the servo hydraulic cylinder when there is no vibration, and test the anti-interference of the electro-hydraulic servo system.

[0021] The vibration resistance testing device and method for the imported guide vane electro-hydraulic servo system of the present invention has the following advantages: The present invention uses a composite excitation device of mechanical vibration and fluid excitation to simulate the mechanical vibration between mechanical structures and the fluid vibration caused by airflow during the operation of the mechanism. The device can perform single vibration test or composite vibration test under complex working conditions to verify and optimize the service performance of the electro-hydraulic servo system in vibration environment. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the vibration resistance testing device for the imported guide vane electro-hydraulic servo system of the present invention.

[0023] The markings in the diagram are as follows: 1. Base; 2. Cylinder support; 3. High-pressure cylinder; 4. Cylinder cover; 5. Impact rod; 6. Vibration table support; 7. Rotatable test table; 8. Vibration motor; 9. Test slide; 10. Servo hydraulic cylinder; 11. Support; 12. Hard spring; 13. Protective rod; 14. Fluid tank; 15. Lower support of vibration table. Detailed Implementation

[0024] To better understand the purpose, structure, and function of this invention, the following detailed description, in conjunction with the accompanying drawings, provides a further explanation of the shock resistance testing device and method for an imported guide vane electro-hydraulic servo system.

[0025] This invention addresses the application environment and usage requirements of imported guide vane electro-hydraulic servo systems, and provides a vibration resistance testing device and method for such systems. The invention employs a composite excitation device combining mechanical vibration and fluid excitation to simulate mechanical vibration between mechanical structures and fluid vibration induced by airflow during operation, thereby verifying and optimizing the service performance of the electro-hydraulic servo system under vibration conditions.

[0026] like Figure 1 As shown, an electro-hydraulic servo system vibration resistance testing device for imported guide vanes includes an electro-hydraulic servo system, a base 1, a cylinder support 2, a high-pressure cylinder 3, a cylinder cover 4, an impact rod 5, a vibration table support 6, a rotatable test table 7, a vibration motor 8, a test slide 9, a servo hydraulic cylinder 10, a support 11, a rigid spring 12, a protective rod 13, a fluid tank 14, and a vibration table lower support 15.

[0027] The servo hydraulic cylinder 10 is fixedly mounted on the support 11, which is bolted to the rotatable test bench 7. The electro-hydraulic servo system is connected to the servo hydraulic cylinder via a cable. The servo hydraulic cylinder provides a carrier for testing the electro-hydraulic servo system. The rotatable test bench 7 is mounted on the vibration table bracket 6 and can be manually rotated to change the angle of the piston rod axis of the servo hydraulic cylinder. The vibration motor 8 is mounted on both sides of the rotatable test bench 7 and bolted to the vibration table bracket 6 to simulate the mechanical vibration experienced by the electro-hydraulic servo system under actual working conditions. The vibration table bracket 6 is fixedly connected to the fluid tank 14 using a rigid spring 12. Different media (gas, hydraulic fluid) can be replaced in the fluid tank to achieve fluid vibration transmitted to the servo hydraulic cylinder 10 through the spring, simulating the fluid vibration caused by gas turbulence under actual working conditions. The cylinder support 2 is bolted to the base 1 and mounted directly in front of the fluid tank 14, and bolted to the cylinder cover 4 to fix the high-pressure cylinder 3. The high-pressure cylinder 3 and the impact rod 5 are mounted on the same axis as the fluid tank 14 to provide power for the fluid excitation of the fluid tank 14. The protective rod 13 is fixedly installed behind the fluid tank 14, and anti-collision rubber is installed between the front end of the protective rod 13 and the rear wall of the fluid tank 14 for cushioning. The support 6 on the vibration table and the lower support 15 on the vibration table are connected by a rigid spring to realize the up and down vibration of the vibration table. The test slide 9 is installed in the groove of the rotatable test table 7 and is hinged to the piston rod of the servo hydraulic cylinder 10 to simulate the running damping of the servo hydraulic cylinder under actual working conditions.

[0028] The electro-hydraulic servo system under test is connected to the servo hydraulic cylinder via a cable.

[0029] Test steps:

[0030] 1. Start the electro-hydraulic servo system under test and test whether the electro-hydraulic servo system can correctly control the servo hydraulic cylinder. By controlling the electro-hydraulic servo valve through the system, the system pressure of the hydraulic circuit is adjusted to realize the reciprocating motion of the piston rod of the servo hydraulic cylinder. Test whether the servo hydraulic cylinder 10 can operate normally.

[0031] 2. Rotate the rotatable test platform 7 to keep the piston rod axis of the servo hydraulic cylinder perpendicular to the vibration motor 8 and lock the rotatable test platform 7. Connect the power supply and start the vibration motor 8 to start the electro-hydraulic servo system under test to control the servo hydraulic cylinder 10 to reciprocate. Collect the displacement curve of the servo hydraulic cylinder 10 and compare it with the displacement curve of the servo hydraulic cylinder when there is no vibration to test the anti-interference of the electro-hydraulic servo system.

[0032] 3. Reset the device and rotate the rotatable test platform 7 to ensure the piston rod axis of the servo hydraulic cylinder is perpendicular to and locked to the axis of the fluid tank 14. Start the high-pressure cylinder 3; the piston of the high-pressure cylinder strikes the impact rod 5, which in turn strikes the rubber at the front end of the fluid tank 14, causing vibration in the medium inside the fluid tank 14. Simultaneously, start the electro-hydraulic servo system to control the reciprocating motion of the servo hydraulic cylinder 10, collect the displacement curve of the servo hydraulic cylinder 10, and compare it with the displacement curve of the servo hydraulic cylinder without vibration to test the anti-interference capability of the electro-hydraulic servo system.

[0033] 4. Reset the device and rotate the rotatable test platform 7 to ensure the piston rod axis of the servo hydraulic cylinder is parallel to and locked with the axis of the fluid tank 14. Start the high-pressure cylinder 3; the piston of the high-pressure cylinder strikes the impact rod 5, which in turn strikes the rubber at the front end of the fluid tank 14, causing vibration in the medium inside the fluid tank 14. Simultaneously, start the electro-hydraulic servo system to control the reciprocating motion of the servo hydraulic cylinder 10, collect the displacement curve of the servo hydraulic cylinder 10, and compare it with the displacement curve of the servo hydraulic cylinder without vibration to test the anti-interference capability of the electro-hydraulic servo system.

[0034] 5. Reset the device, rotate the rotatable test platform 7 to keep the piston rod axis of the servo hydraulic cylinder parallel to the vibration motor 8, and lock the rotatable test platform 7. Connect the power supply and start the vibration motor 8 to start the electro-hydraulic servo system under test to control the servo hydraulic cylinder 10 to reciprocate. Collect the displacement curve of the servo hydraulic cylinder and compare it with the displacement curve of the servo hydraulic cylinder without vibration to test the anti-interference ability of the electro-hydraulic servo system.

[0035] 6. Reset the device, rotate the rotatable test platform 7 to keep the piston rod axis of the servo hydraulic cylinder parallel to the vibration motor 8, and lock the rotatable test platform. First, connect the power supply and start the vibration motor 8 to start the electro-hydraulic servo system under test to control the servo hydraulic cylinder 10 to reciprocate. Start the high-pressure cylinder 3 to impact the fluid tank to form fluid excitation. Collect the displacement curve of the servo hydraulic cylinder 10 and compare it with the displacement curve of the servo hydraulic cylinder when there is no vibration to test the anti-interference of the electro-hydraulic servo system.

[0036] It is understood that the present invention has been described through some embodiments, and those skilled in the art will recognize that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of the invention. Furthermore, under the teachings of the present invention, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of the invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the protection scope of the present invention.

Claims

1. A method for conducting vibration resistance testing of an imported guide vane electro-hydraulic servo system using a vibration resistance testing device, wherein the servo hydraulic cylinder is connected to the electro-hydraulic servo system via a cable and provides a carrier for the electro-hydraulic servo system, characterized in that... The servo hydraulic cylinder is fixedly mounted on a rotatable test bench, which is mounted on a vibration table bracket. Vibration motors are mounted on both sides of the rotatable test bench and fixedly connected to the vibration table bracket. A rigid spring connects the vibration table bracket to the fluid tank. A cylinder support is fixedly connected to the base and installed directly in front of the fluid tank. A high-pressure cylinder and impact rod are mounted on the same axis as the fluid tank. A rigid spring connects the vibration table bracket to the vibration table support, enabling the vibration table to vibrate up and down. S1: By controlling the electro-hydraulic servo valve, the system pressure of the hydraulic circuit is adjusted to achieve the reciprocating motion of the servo hydraulic cylinder piston rod, thus testing whether the servo hydraulic cylinder can operate normally. S2: Rotate the rotatable test platform to keep the piston rod axis of the servo hydraulic cylinder perpendicular to the vibration motor and lock the rotatable test platform. Start the vibration motor, control the reciprocating motion of the servo hydraulic cylinder, and collect the displacement curve of the servo hydraulic cylinder. S3: Reset the device, rotate the rotatable test platform to keep the piston rod axis of the servo hydraulic cylinder perpendicular to the fluid tank axis and lock it, start the high-pressure cylinder to run, the piston of the high-pressure cylinder hits the impact rod, the impact rod hits the front rubber of the fluid tank, the medium in the fluid tank is excited and vibrates, controlling the reciprocating motion of the servo hydraulic cylinder, and collecting the displacement curve of the servo hydraulic cylinder. S4: Reset the device, rotate the rotatable test platform to keep the piston rod axis of the servo hydraulic cylinder parallel to the fluid tank axis and lock it, start the high-pressure cylinder to run, the piston of the high-pressure cylinder hits the impact rod, the impact rod hits the front rubber of the fluid tank, the medium in the fluid tank is excited and vibrates, controlling the reciprocating motion of the servo hydraulic cylinder, and collecting the displacement curve of the servo hydraulic cylinder. S5: Reset the device, rotate the rotatable test platform to keep the piston rod axis of the servo hydraulic cylinder parallel to the vibration motor and lock the rotatable test platform, start the vibration motor, control the reciprocating motion of the servo hydraulic cylinder, and collect the displacement curve of the servo hydraulic cylinder. S6: Reset the device, rotate the rotatable test platform to keep the piston rod axis of the servo hydraulic cylinder parallel to the vibration motor and lock the rotatable test platform; start the vibration motor, control the reciprocating motion of the servo hydraulic cylinder, start the high-pressure cylinder to strike the fluid tank to form fluid excitation, collect the displacement curve of the servo hydraulic cylinder, compare the displacement curves collected in S2-6 with the displacement curve of the servo hydraulic cylinder when there is no vibration, and test the anti-interference of the electro-hydraulic servo system.

2. The method according to claim 1, characterized in that, The rotatable test stand can be manually rotated to change the angle of the piston rod axis of the servo hydraulic cylinder.

3. The method according to claim 1, characterized in that, The servo hydraulic cylinder is fixedly installed on the support, and the support is fixedly connected to the rotatable test bench by bolts.

4. The method according to claim 3, characterized in that, Includes a cylinder cover, wherein the cylinder support and the cylinder cover are bolted together for fixing a high-pressure cylinder.

5. The method according to claim 1, characterized in that, The fluid tank can be filled with different media to achieve fluid vibration, which is transmitted to the servo hydraulic cylinder by a spring, simulating fluid vibration caused by gas turbulence under actual working conditions.

6. The method according to claim 5, characterized in that, The medium is gas or hydraulic fluid.

7. The method according to claim 1, characterized in that, It includes a protective rod, which is fixedly installed at the rear of the fluid tank, and anti-collision rubber is installed between the front end of the protective rod and the rear wall of the fluid tank for cushioning.

8. The method according to claim 1, characterized in that, The test slide is installed in the groove of the rotatable test platform and is hinged to the piston rod of the servo hydraulic cylinder to simulate the operating damping of the servo hydraulic cylinder under actual working conditions.

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