High-low-cycle bidirectional coupling vibration test platform

Abstract

The utility model discloses a high-low-cycle bidirectional coupling vibration test platform, which comprises a test device table, a high-frequency vibration fatigue loading device, a low-frequency vibration fatigue loading device and a vibration stretching decoupling device. According to the test platform, the vibration table is fixedly connected with the test device table, and the vibration table is suspended on the test device table, so that the high-frequency vibration fatigue loading device and the low-frequency vibration fatigue loading device are fixed on the same installation reference, and the integration of the high-frequency vibration fatigue loading device and the low-frequency vibration fatigue loading device is realized; in this way, assembly errors caused by different installation references can be effectively reduced, mutual influence of decoupling devices is reduced, and the implementation precision can be effectively improved. And a pressure sensor of a low-frequency vibration fatigue loading device of the test platform is connected with the movable support through a joint bearing decoupling device, so that unbalance loading during loading of the hydraulic cylinder can be prevented, the test precision is improved, and the service life of equipment is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of material or structure vibration fatigue test, concretely relates to a high low week two -way coupling vibration test platform based on. BACKGROUND

[0002] The blade of an aircraft engine is a key component of the engine, and accurate prediction of the life of the turbine blade is of great significance to ensure the safe operation of the aircraft engine. Fatigue testing of the turbine blade is an effective means to predict its life. The invention patent (application number: CN202410909392.7) discloses a thermal machine fatigue and vibration fatigue coupling loading test device and method based on resonance. The thermal machine fatigue loading device and the vibration fatigue loading device in the device are located above and below the test device table, respectively. The two sides and the bottom of the test piece clamp are connected to the thermal machine fatigue loading device and the vibration fatigue loading device through the vibration and tension decoupling mechanism. The device can accelerate the fatigue behavior of materials or structures under the combined action of thermal mechanical load and high frequency vibration load, sharply increase the initiation rate and propagation rate of fatigue cracks, and provide a large number of fatigue simulation tests and test data for the establishment of subsequent blade or material life models and the feasibility of testing and designing blade structures or materials.

[0003] This high low week two -way coupling vibration test platform is mainly composed of a test device table, a low frequency vibration fatigue loading device, a high frequency vibration fatigue loading device, a test piece clamp, a vibration and tension decoupling mechanism, etc. It can complete low frequency vibration fatigue and high frequency vibration fatigue coupling loading test. The low frequency vibration fatigue loading device of this test platform is fixedly installed on the test device table, and the vibration table as the high frequency vibration fatigue loading device is installed on the vibration table wallboard. The test device table and the vibration table wallboard are fixed to the ground respectively, so the installation bases of the low frequency vibration fatigue loading device and the high frequency vibration fatigue loading device are inconsistent, which will cause a large assembly error, leading to a larger mutual influence of the vibration tension decoupling device, and further affecting the accuracy of the test. In addition, one end of the force sensor in the low frequency vibration fatigue device of this vibration test platform is directly connected with the movable support rigidly. If the force sensor and the movable support are not installed vertically during the test, there will be an unbalanced load when the hydraulic actuator loads, and the hydraulic actuator and the sensor are prone to damage to varying degrees, reducing their service life. Therefore, the processing of the installation contact surface of the movable support and the force sensor is required to be strict, which will also increase the installation difficulty and cost of the whole test platform. UTILITY MODEL CONTENTS

[0004] The utility model provides a high low week two -way coupling vibration test platform that can realize accurate positioning of equipment, effectively improve test precision and prolong the service life of the pressure sensor.

[0005] A high-low frequency bidirectional coupling vibration test platform, comprising: a test device table, wherein a vibration table assembly hole is arranged on the test device table; a high-frequency vibration fatigue loading device, wherein the high-frequency vibration fatigue loading device comprises a vibration table, the upper end of the vibration table passes through the vibration table assembly hole, the vibration table is fixedly connected with the test device table, the vibration table is hoisted on the test device table, and a vibration table connector is arranged on the power output end of the vibration table; a low-frequency vibration fatigue loading device, wherein the low-frequency vibration fatigue loading device comprises first and second fixed supports, the first and second fixed supports are fixed on the upper end surface of the test device table, two parallel arranged cylindrical slide rails are arranged between the first and second fixed supports, an active support is arranged on the slide rails, a hydraulic cylinder is arranged on the first fixed support, and the piston rod of the hydraulic cylinder is connected with the active support through a pressure sensor; and a vibration-tension decoupling device, wherein the vibration-tension decoupling device comprises first and second test piece connecting seats opposite to each other, the first test piece connecting seat is slidably connected with the second fixed support through a vertical guide rail, the second test piece connecting seat is slidably connected with the active support through a vertical guide rail, and the first and second test piece connecting seats are slidably connected with the vibration table connector through a horizontal slide rail.

[0006] Preferably, the vibration table is fixed on the upper end surface of the test device table through a magnetic steel cover.

[0007] Preferably, a joint bearing decoupling device is arranged between the pressure sensor and the active support, the joint bearing decoupling device comprises a joint bearing, one end of the joint bearing is connected with the active support, the bearing end of the joint bearing is connected with a sensor fixed seat through a pin shaft, one end of the pressure sensor is connected with the sensor fixed seat, and the other end of the pressure sensor is connected with the piston rod of the hydraulic cylinder.

[0008] Preferably, the pressure sensor is threadedly connected with the piston rod of the hydraulic cylinder.

[0009] Preferably, a force arm is arranged on each of the second fixed support and the active support, the vertical slide rail is arranged on the force arm, and the first and second test piece connecting seats are slidably connected with the force arm.

[0010] Preferably, the force arm is a C-shaped force arm, vertical slide rails are arranged at two ends of the C-shaped force arm, vertical slide blocks are arranged at two ends of the first and second test piece connecting seats, and the vertical slide blocks are arranged on the vertical slide rails.

[0011] Preferably, the top of the vibration table connector is provided with a transverse sliding rail, the bottom of the first test piece connecting seat and the second test piece connecting seat is provided with a transverse sliding block, and the transverse sliding block is arranged on the transverse sliding rail.

[0012] Preferably, the test device table is provided with a T-shaped groove.

[0013] Preferably, the test device table is uniformly provided with a plurality of reinforcing ribs.

[0014] The high-low frequency bidirectional coupling vibration test platform has the following beneficial effects: the vibration table and the test device table are fixedly connected, the vibration table is suspended on the test device table, so that the high-frequency vibration fatigue loading device and the low-frequency vibration fatigue loading device are fixed on the same installation datum, the high-frequency vibration fatigue loading device and the low-frequency vibration fatigue loading device are integrated, the assembly error caused by different installation datums is effectively reduced, the mutual influence of the decoupling devices is reduced, and the implementation precision is effectively improved; in addition, the pressure sensor of the low-frequency vibration fatigue loading device of the test platform is connected with the movable support through a joint bearing decoupling device, so that the eccentric load of the hydraulic cylinder during loading is prevented, the test precision is improved, the hydraulic cylinder or the pressure sensor is prevented from being damaged, and the service life of the equipment is prolonged.

[0015] In order to further understand the features and technical contents of the present application, please refer to the following detailed description and drawings of the present application. The drawings provided are only used for reference and illustration, and are not used to limit the present application. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a whole structure schematic view of the embodiment of the present application.

[0017] Figure 2 It is a structure schematic view of the high-frequency vibration fatigue loading device of the embodiment of the present application.

[0018] Figure 3 It is a structure schematic view of the low-frequency vibration fatigue loading device of the embodiment of the present application.

[0019] Figure 4 It is a structure schematic view of the vibration tensile decoupling device of the embodiment of the present application.

[0020] Figure 5 It is a connection schematic view of the test piece connecting seat and the second fixed support of the embodiment of the present application.

[0021] Explanation of original part number: 1, test device table; 11, T-shaped groove; 2, high-frequency vibration fatigue loading device; 21, vibration table; 22, magnetic steel cover; 23, vibration table table top; 24, vibration table connector; 3, low-frequency vibration fatigue loading device; 31, hydraulic cylinder; 32, first fixed support; 33, second fixed support; 34, movable support; 35, cylindrical slide rail; 36, shaft sleeve; 37, C-shaped force arm; 38, joint bearing decoupling device; 381, joint bearing; 382, pin shaft; 383, sensor fixing seat; 39, pressure sensor; 4, vibration tension decoupling device; 41, first test piece connecting seat; 42, second test piece connecting seat; 43, vertical guide rail; 44, sliding block; 45, horizontal guide rail; 46, sliding block; 5, test piece. DETAILED DESCRIPTION

[0022] The following is to illustrate the embodiments disclosed by the present application through specific embodiments. Those skilled in the art can understand the advantages and effects of the present application from the disclosed content. The present application can be implemented or applied through other different embodiments, and each detail in the specification can be modified and changed based on different viewpoints and applications without departing from the concept of the present application. In addition, the drawings of the present application are only simple schematic illustrations, not the actual size description, and the prior declaration is made. The following embodiments will further illustrate the related technical content of the present application, but the disclosed content is not used to limit the protection scope of the present application.

[0023] The above disclosed content is only the preferred feasible embodiment of the present application, and is not used to limit the patent application scope of the present application. Therefore, any equivalent technical change made by applying the content of the specification and drawings of the present application is included in the patent application scope of the present application.

[0024] As shown in Figure 1 , 2 The present application discloses a high-low frequency bidirectional coupling vibration test platform, which comprises a test device table 1, a high-frequency vibration fatigue loading device 2, a low-frequency vibration fatigue loading device 3 and a vibration tension decoupling device 4. The high-frequency vibration fatigue loading device 2 and the low-frequency vibration fatigue loading device 3 are arranged on the test device table 1, and the vibration tension decoupling device 4 is used to connect with the test piece. The high-frequency vibration fatigue loading device 2 is used to provide high-frequency vibration loading for the test piece, and the low-frequency vibration fatigue loading device 3 is used to provide low-frequency vibration loading for the test piece.

[0025] The test device table 1 is welded by high-quality low-carbon steel, and the inner and outer parts are uniformly distributed with reinforcing bars. A plurality of parallel T-shaped grooves 11 are arranged horizontally on the table top, which has the advantages of good rigidity and high installation precision. The high-frequency vibration fatigue loading device 2 includes a vibration table 21. The test device table 1 is provided with a vibration table assembly hole matched with the vibration table 21. The upper end of the vibration table 21 protrudes from the upper end surface of the test device table 1 through the vibration table assembly hole. The part of the vibration table 21 protruding from the upper end surface of the test device table 1 is provided with a magnetic steel cover 22. The magnetic steel cover 22 is fixedly connected with the outer peripheral surface of the vibration table 21. The magnetic steel cover 22 is fixedly connected with the test device table 1. The vibration table 21 is hoisted on the test device table 1. The vibration table surface 23 serving as the power output end of the vibration table 21 is connected with a vibration table connector 24. The vibration table connector 24 is used to be connected with the vibration tensile decoupling device 4.

[0026] As shown in Figure 3 , the low-frequency vibration fatigue loading device 3 includes a first fixed support 32 and a second fixed support 33. The first fixed support 32 and the second fixed support 33 are fixed on the upper end surface of the test device table 1. The first fixed support 32 is provided with a hydraulic cylinder 31 serving as a power source for low-frequency fatigue test. Two parallel cylindrical slide rails 35 are arranged between the first fixed support 32 and the second fixed support 33. The cylindrical slide rail 35 is provided with a movable support 34. The movable support 34 is slidably connected with the cylindrical slide rail 35 through a shaft sleeve 36. The piston rod of the hydraulic cylinder 31 penetrates through the first fixed support 32. The end of the piston rod is connected with the movable support 34 through a pressure sensor 39.

[0027] As a preferred embodiment, a joint bearing decoupling device 38 is arranged between the pressure sensor 39 and the movable support 34. The joint bearing decoupling device 38 includes a joint bearing 381. One end of the joint bearing 381 is connected with the movable support 34. The bearing end of the joint bearing 381 is connected with a sensor fixed seat 383 through a pin shaft 382. One end of the pressure sensor 39 is connected with the sensor fixed seat 383. The other end of the pressure sensor 39 is connected with the piston rod of the hydraulic cylinder 31 in a threaded manner. The joint bearing decoupling device can prevent the eccentric load of the hydraulic actuator during loading caused by the non-perpendicular installation of the pressure sensor and the movable support, ensure the test precision, and effectively prolong the service life of the hydraulic cylinder or the pressure sensor.

[0028] As shown in Figure 4 , 5As shown, the vibration-tension decoupling device 4 includes a first test piece connecting seat 41 and a second test piece connecting seat 42 opposite to each other, the first test piece connecting seat 41 is slidably connected with the second fixed support 33 through a vertical guide rail 43, the second fixed support 33 is provided with a C-shaped force arm 37, both ends of the C-shaped force arm 37 are provided with vertical guide rails 43, both ends of the first test piece connecting seat 41 are provided with vertical sliding blocks 44, and the vertical sliding blocks 44 are slidably connected with the vertical guide rails 43. The second test piece connecting seat 42 is connected with the movable support 34 in the same way as the above connection, the second test piece connecting seat 42 is slidably connected with the movable support 34 through a vertical guide rail 44, the movable support 34 is provided with a C-shaped force arm 37, both ends of the C-shaped force arm 37 are provided with vertical guide rails 43, both ends of the second test piece connecting seat 42 are provided with vertical sliding blocks 44, and the vertical sliding blocks 44 are slidably connected with the vertical guide rails 43.

[0029] A horizontal sliding block 46 is arranged at the lower end of the first test piece connecting seat 41 and the second test piece connecting seat 42, and a horizontal sliding rail 45 is arranged at the top of the vibration table connector 24, the horizontal sliding block 46 is arranged in the horizontal sliding rail 45 and slidably connected therewith.

[0030] In use, the high-low frequency bidirectional coupling vibration test platform connects two ends of the test piece 5 through the first test piece connecting seat 41 and the second test piece connecting seat 42. The hydraulic cylinder 31 loads the test piece 5 through the joint bearing decoupling device 38 and the vibration-tension decoupling device 4; the vibration table 21 loads the test piece 5 through the vibration-tension decoupling device 4 to complete the high-low frequency bidirectional coupling vibration test of the test piece.

[0031] The high-low frequency bidirectional coupling vibration test platform fixes the vibration table and the test device table, and suspends the vibration table on the test device table, so that the high-frequency vibration fatigue loading device and the low-frequency vibration fatigue loading device are fixed on the same installation reference, the base of the high-frequency vibration fatigue loading device and the low-frequency vibration fatigue loading device is integrated, which can effectively reduce the assembly error caused by different installation references, reduce the mutual influence of the decoupling devices, and further improve the implementation precision; in addition, the pressure sensor of the low-frequency vibration fatigue loading device of the test platform is connected with the movable support through a joint bearing decoupling device, which can prevent the hydraulic cylinder from being loaded with unbalanced load, improve the test precision, and prevent the hydraulic cylinder or the pressure sensor from being easily damaged, and prolong the service life of the equipment.

Claims

1. A high-low frequency bidirectional coupling vibration test platform, characterized in that it comprises: a test device table, which is provided with a vibration table assembly hole; a high-frequency vibration fatigue loading device, which comprises a vibration table, the upper end of the vibration table passes through the vibration table assembly hole, the vibration table is fixedly connected with the test device table, the vibration table is hoisted on the test device table, and the power output end of the vibration table is provided with a vibration table connector; a low-frequency vibration fatigue loading device, which comprises first and second fixed supports, the first and second fixed supports are fixed on the upper end surface of the test device table, two parallel cylindrical slide rails are arranged between the first and second fixed supports, an active support is arranged on the slide rails, a hydraulic cylinder is arranged on the first fixed support, and the piston rod of the hydraulic cylinder is connected with the active support through a pressure sensor; a vibration-tension decoupling device, which comprises oppositely-arranged first and second test piece connecting seats, the first test piece connecting seat is slidably connected with the second fixed support through a vertical guide rail, the second test piece connecting seat is slidably connected with the active support through a vertical guide rail, and the first and second test piece connecting seats are slidably connected with the vibration table connector through a horizontal slide rail. 2.The high-low frequency bidirectional coupling vibration test platform according to claim 1, characterized in that the vibration table is fixed on the upper end surface of the test device table through a magnetic steel cover. 3.The high-low frequency bidirectional coupling vibration test platform according to claim 1, characterized in that a joint bearing decoupling device is arranged between the pressure sensor and the active support, the joint bearing decoupling device comprises a joint bearing, one end of the joint bearing is connected with the active support, the bearing end of the joint bearing is connected with a sensor fixing seat through a pin shaft, one end of the pressure sensor is connected with the sensor fixing seat, and the other end of the pressure sensor is connected with the piston rod of the hydraulic cylinder. 4.The high-low frequency bidirectional coupling vibration test platform according to claim 3, characterized in that the pressure sensor is threadedly connected with the piston rod of the hydraulic cylinder. 5.The high-low frequency bidirectional coupling vibration test platform according to claim 1, characterized in that force arms are arranged on the second fixed support and the active support, the vertical slide rails are arranged on the force arms, and the first and second test piece connecting seats are slidably connected with the force arms. 6.The high-low frequency bidirectional coupling vibration test platform according to claim 5, characterized in that the force arms are C-shaped force arms, vertical slide rails are arranged at two ends of the C-shaped force arms, vertical slide blocks are arranged at two ends of the first and second test piece connecting seats, and the vertical slide blocks are arranged on the vertical slide rails.

7. The high-low bidirectional coupling vibration test platform of claim 1, wherein the top of the vibration table connector is provided with a transverse sliding rail, the bottom of the first test piece connecting seat and the second test piece connecting seat are provided with transverse sliding blocks, and the transverse sliding blocks are arranged on the transverse sliding rail.

8. The high-low bidirectional coupling vibration test platform of claim 1, wherein the test device table is provided with a T-shaped groove.

9. The high-low bidirectional coupling vibration test platform of claim 1, wherein the test device table is uniformly provided with a plurality of reinforcing ribs.

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