Pendulum type vibration absorber composite loading device in test state

Abstract

The invention provides a pendulum type vibration absorber composite loading device in a test state, which comprises a pendulum type vibration absorber 1, a transverse support frame 2, a transverse actuator 3, a transverse force column 4, a longitudinal force column 5, a longitudinal actuator 6, a longitudinal support frame 7, a bottom plate 8, a stress application rod 9, a stress application rod guide key groove 10 and a force column sliding groove 11, a main blade swing type vibration absorber is fixed at the position of a blade bushing, a rotating shaft, a rocker arm and a rocker arm mounting bolt structure adopt false parts, the mounting needs to simulate a real mounting environment, a shell bears a low-cycle load, a low-cycle fatigue test is carried out, and the direction of the rocker arm is parallel to the direction of a blade; the support frame 2 is fixed on the bottom plate 8 through a bolt, keeps the horizontal state of the transverse actuator 3, is provided with a bolt hole, and firmly connects the transverse actuator 3 through the bolt; and the transverse actuator 3 is an action execution part for the test system to carry out a loading test and receive a control command.

Description

Technical Field

[0001] The present application relates to the field of structural testing of aviation technology, and in particular to a composite loading device for a pendulum-type vibration absorber under a test state. Background Art

[0002] In the fatigue test of aviation product structural parts, there are many important parts that need to be fatigue tested, and the fatigue test process needs to be adapted to the normal use environment of the structural parts on the aircraft as much as possible. This requires us to design a set of pendulum vibration absorber composite loading device under the test state to simulate the force of the part under the test environment of the flying part installation state.

[0003] In actual engineering design, the pendulum vibration absorber bears four loads in the spatial direction. Since the pendulum vibration absorber has a certain flexibility and the four load directions are different, but the test accuracy needs to be guaranteed, the composite loading device of the pendulum vibration absorber under the test state needs to meet the installation accuracy requirements, loading accuracy requirements, flexible loading requirements and durability requirements of the pendulum vibration absorber at the same time. Therefore, the necessity of designing "a composite loading device for a pendulum vibration absorber under the test state" is very obvious. Summary of the invention

[0004] The present application provides a composite loading device for a pendulum vibration absorber under a test state, which can solve the problem of low test accuracy in the prior art.

[0005] Technical solution: The present application provides a composite loading device for a pendulum vibration absorber under a test state, the device comprising a pendulum vibration absorber 1, a lateral support frame 2, a lateral actuator 3, a lateral force column 4, a longitudinal force column 5, a longitudinal actuator 6, a longitudinal support frame 7, a bottom plate 8, a force rod 9, a force rod guide keyway 10, and a force column slideway 11, wherein:

[0006] The pendulum vibration absorber 1 is supported by a fixture, and the main blade pendulum vibration absorber is fixed at the position of the blade bushing. The rotating shaft, rocker arm and rocker arm mounting bolt structure are dummy parts. The installation should simulate the actual installation environment. The shell is subjected to low-cycle loads and undergoes low-cycle fatigue test assessment. The direction of the rocker arm is parallel to the direction of the blade; the support frame 2 is fixed to the base plate 8 by bolts, and keeps the lateral actuator 3 in a horizontal state, and is equipped with bolt holes, and the lateral actuator 3 is firmly connected by bolts; the lateral actuator 3 is the action execution part of the test system for loading tests and accepting control commands; the lateral force column 4 is fixed to the base plate 8 by bolts, and is equipped with a support platform to keep the lateral actuator 3 in a horizontal state; the longitudinal force column 5 is fixed to the base plate 8 by bolts, and is equipped with a support platform to keep the longitudinal actuator 7 in a horizontal state; the longitudinal actuator 6 is the action execution part of the test system for loading tests and accepting control commands; the longitudinal support frame 7 is fixed to the base plate 8 by bolts , and keep the longitudinal actuator 6 in a horizontal state, and is equipped with bolt holes, and the longitudinal actuator 6 is firmly connected by bolts; the base plate 8 is fastened to the floor rail or steel platform of the factory by bolts, and the transverse support frame 2, the transverse force column 4, the longitudinal force column 5, and the longitudinal support frame 7 are accurately positioned on the base plate by laser positioning and installing positioning pins, and then threaded holes are expanded thereon to fix the transverse support frame 2, the transverse force column 4, the longitudinal force column 5 and the longitudinal support frame 7 to the base plate; one end of the force rod 9 is connected to the sensor on the longitudinal actuator 6, and the other end is connected to the pendulum vibration absorber 1, which can freely reciprocate flexibly in the rolling linear ball bearing inside the longitudinal support frame 7, and the force rod guide keyway 10 adopts a convex groove design, and its force rod 9 cannot rotate in the force column slide groove 11, and can only reciprocate back and forth; the force column slide groove 11 adopts a groove design, and its force rod guide keyway 10 cannot rotate in the force column slide groove 11, and can only reciprocate back and forth.

[0007] Specifically, the lateral actuator 3 includes an action cylinder, a moving piston, a cylinder end cover, a hydraulic distribution valve group, a quick-change self-closing high-pressure oil pipe joint, a high-precision and high-sensitivity servo valve, a high-precision force sensor, a high-precision displacement sensor, and a joint ball joint support.

[0008] Specifically, the longitudinal actuator 6 includes an action cylinder, a moving piston, a cylinder end cover, a hydraulic distribution valve group, a quick-change self-closing high-pressure oil pipe joint, a high-precision and high-sensitivity servo valve, a high-precision force sensor, a high-precision displacement sensor, and a joint ball joint support.

[0009] Specifically, the hydraulic working pressure of the lateral actuator 3 is 21 MPa, and the particle index is not greater than 5 um.

[0010] Specifically, the cylinder and piston of the lateral actuator 3 are processed using aviation spraying technology. The piston is made of high-strength alloy steel and has a hard chrome-plated surface. A hydraulic buffer pad is designed inside the actuator to protect the piston from sudden loss of control and impact. The actuator uses a composite seal composed of filled polytetrafluoroethylene and an O-ring. The piston rod guide part is sprayed with industrial plastics; and special materials are sprayed on the sealing surface between the cylinder and the piston.

[0011] Specifically, the hydraulic working pressure of the longitudinal actuator 6 is 21 MPa, and the particle index is not greater than 5 um.

[0012] Specifically, the longitudinal actuator 6 cylinder and piston are processed using aviation spraying technology, the piston is made of alloy steel and the surface is hard chrome-plated; a hydraulic buffer pad is designed inside the actuator to protect the piston from sudden loss of control and impact; the actuator uses a composite seal composed of filled polytetrafluoroethylene and an O-ring; the piston rod guide part is sprayed with industrial plastic to enhance the ability to resist lateral loads; and special materials are sprayed on the sealing surface between the cylinder and the piston.

[0013] Specifically, the force adding rod 9 adopts the polished rod process with a finish of 3.2 and a tolerance of H6.

[0014] In summary, the present application provides a composite loading device for a pendulum vibration absorber under a test state, which meets the installation accuracy requirements through hydraulic flexible loading and coordinated loading technology, achieves the technical indicators of coordinated loading accuracy in four directions, and improves the accuracy and durability requirements of the test. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A schematic diagram of the structure of a composite loading device for a pendulum vibration absorber in a test state provided in this application; Figure 2 A schematic structural diagram of a force adding rod 9 provided in this application;

[0016] Among them: 1-swing vibration absorber, 2-lateral support frame, 3-lateral actuator, 4-lateral force column, 5-longitudinal force column, 6-longitudinal actuator, 7-longitudinal support frame, 8-bottom plate, 9-force rod, 10-force rod guide keyway, 11-force column slideway. DETAILED DESCRIPTION

[0017] Embodiment 1

[0018] The present application provides a composite loading device for a pendulum vibration absorber under a test state, which can solve the problem that the composite loading device for a pendulum vibration absorber under a test state needs to meet the installation accuracy requirements, loading accuracy requirements, flexible loading requirements and durability requirements of the test piece at the same time.

[0019] like Figure 1As shown, the present application provides a pendulum vibration absorber composite loading device under a test state, the device comprising a pendulum vibration absorber 1, a lateral support frame 2, a lateral actuator 3, a lateral force column 4, a longitudinal force column 5, a longitudinal actuator 6, a longitudinal support frame 7, a bottom plate 8, a force rod 9, a force rod guide keyway 10, and a force column slideway 11, wherein:

[0020] The pendulum vibration absorber 1 is supported by a fixture, and the main blade pendulum vibration absorber is fixed at the position of the blade bushing. The rotating shaft, rocker arm and rocker arm mounting bolt structure are dummy parts. The installation should simulate the real installation environment. The shell is subjected to low-cycle load and low-cycle fatigue test assessment is carried out. The rocker arm direction is parallel to the blade direction. The support frame 2 is fixed on the bottom plate (8) by two rows of bolts, and keeps the lateral actuator 3 in a horizontal state. It is equipped with bolt holes, and the lateral actuator 3 is firmly connected by bolts. The lateral actuator 3 includes an action cylinder, a moving piston, an oil cylinder end cover, a hydraulic distribution valve group, a quick-change self-closing high-pressure oil pipe joint, a high-precision and high-sensitivity servo valve, a high-precision force sensor, a high-precision displacement sensor, and a joint ball joint support. The lateral actuator 3 is the action execution part of the test system for loading test and receiving control commands. The lateral force column 4 is fixed on the bottom plate (8) by two rows of bolts, and is equipped with a support platform to keep the lateral actuator 3 in a horizontal state. The longitudinal force column 5 is fixed on the bottom plate (8) by two rows of bolts and is equipped with a support platform to keep the longitudinal actuator 7 in a horizontal state. The longitudinal actuator 6 includes a working oil cylinder, a moving piston, an oil cylinder end cover, a hydraulic distribution valve group, a quick-change self-closing high-pressure oil pipe joint, a high-precision and high-sensitivity servo valve, a high-precision force sensor, a high-precision displacement sensor, a joint ball joint support and other components. It is the action execution part of the test system for loading test and receiving control commands. The longitudinal support frame 7 is fixed on the bottom plate (8) by two rows of bolts to keep the longitudinal actuator 6 in a horizontal state, and is equipped with bolt holes to firmly connect the longitudinal actuator 6 to the bottom plate. The bottom plate 8 is fastened to the floor rail or steel platform of the factory by bolts. The transverse support frame 2, the transverse force column 4, the longitudinal force column 5, and the longitudinal support frame 7 are accurately positioned on the bottom plate by laser positioning and installing positioning pins, and then threaded holes are expanded on them to fix the transverse support frame 2, the transverse force column 4, the longitudinal force column 5 and the longitudinal support frame 7 to the bottom plate. One end of the boosting rod 9 is connected to the sensor on the longitudinal actuator 6, and the other end is connected to the pendulum vibration absorber 1. It can freely reciprocate in the rolling linear ball bearing inside the longitudinal support frame 7. The slender structure design enables it to withstand a certain degree of curvature, which is convenient for compound loading. The boosting rod guide keyway 10 adopts a convex groove design, and its boosting rod 9 cannot rotate in the force column slideway (11) and can only reciprocate back and forth. The force column slideway (11) adopts a groove design, and its boosting rod guide keyway 10 cannot rotate in the force column slideway (11) and can only reciprocate back and forth.

[0021] Specifically, the hydraulic working pressure of the lateral actuator 3 is 21 MPa, the filtering accuracy reaches the 6th level accuracy of the NAS1638 standard of NASA, and the particle index is not greater than 5um.

[0022] Specifically, the oil cylinder and piston of the lateral actuator 3 are processed by aviation spraying technology. The piston is made of high-strength alloy steel, with hard chrome plating on the surface, wear-resistant, and reliable fatigue life. A hydraulic buffer pad is designed in the actuator to protect the piston from sudden loss of control. The actuator uses a composite seal composed of filled polytetrafluoroethylene and an O-ring, which has a tight fit and good sealing effect and can be used for high-speed movement. The piston rod guide part is sprayed with industrial plastic to enhance the ability to resist lateral loads. Special materials are sprayed on the sealing surface between the oil cylinder and the piston. After precision processing, it ensures that the friction of the actuator during the forward and return strokes is small and approximately equal, the inertia is small, the sealing performance is good, the wear resistance is durable, and the working life is long.

[0023] Specifically, the hydraulic working pressure of the longitudinal actuator 6 is 21 MPa, the filtering accuracy reaches the 6th level accuracy of the NAS1638 standard of NASA, and the particle index is not greater than 5um.

[0024] Specifically, the longitudinal actuator 6 cylinder and piston are processed with advanced military aviation spraying technology. The piston is made of high-strength alloy steel, with hard chrome plating on the surface, wear-resistant, and reliable fatigue life. A hydraulic buffer pad is designed in the actuator to protect the piston from sudden loss of control. The actuator uses a composite seal composed of filled polytetrafluoroethylene and an O-ring, which has a tight fit and good sealing effect and can be used for high-speed movement. The piston rod guide part is sprayed with industrial plastic to enhance the ability to resist lateral loads. Special materials are sprayed on the sealing surface between the cylinder and the piston. After precision processing, it ensures that the actuator has small and approximately equal friction in the forward and return strokes, small inertia, good sealing performance, long-lasting wear resistance, and long working life.

[0025] In practical applications, the thickness of the bottom plate 8 is 7 mm.

[0026] Specifically, the force adding rod 9 adopts the polished rod process with a finish of 3.2 and a tolerance of H6.

[0027] In actual application, one low-cycle fatigue test load program block corresponds to 100 flight hours and contains two states:

[0028] a State 1: 1900 cycles of supertorque centrifugal force

[0029] b State 2: 100 cycles of ultracentrifugal force

[0030] Low cycle fatigue test load:

[0031] State 1:

[0032] F1 loading load: 0N-4380N-0N

[0033] F2 loading load: 0N-4380N-0N

[0034] State 2:

[0035] F1 loading load: 0N-6410N-0N

[0036] F2 loading load: 0N-6410N-0N

[0037] Along the direction of the rocker arm, the direction indicated by the arrow in the figure is positive, that is, the rocker arm is pulled positively.

[0038] All loads are applied in phase.

[0039] The shell low cycle fatigue test requires the completion of 60 load program blocks.

[0040] After the low-cycle fatigue test of the shell is completed, the shaft, rocker arm and rocker arm mounting bolts shall be replaced with real parts. The installation shall simulate the actual installation environment, and the direction of the rocker arm shall be parallel to the direction of the blade.

[0041] The high cycle fatigue test load is:

[0042] F3=F4=2291±1910N

[0043] Along the direction of the rocker arm, the direction indicated by the arrow in the figure is positive, that is, the rocker arm is pulled positively.

[0044] F5=F6=364±680N

[0045] Vertical rocker arm direction, the arrow in the figure points to the positive direction. All loads are loaded in the same phase.

[0046] It should be noted that the transverse support frame (2), the transverse force column (4), the longitudinal support frame (7) and the longitudinal force column (5) are respectively installed on the base plate (8), the two transverse support frames (2) are respectively connected to the transverse actuator (3), one of the two longitudinal support frames (7) is connected to the test piece (1), and the other longitudinal support frame (7) is simultaneously connected to the two longitudinal actuators (6).

[0047] It should be noted that grooves are respectively provided on the two transverse support frames (2) to facilitate the transverse actuator (3) to slide within the support and a certain range, and the transverse actuator (3) is finally connected to the test piece (1). The transverse actuator (3) is connected to the force column slide groove (11) and the force rod (9), and the force rod (9) is also connected to the test piece (1). The force rod (9) and the force column slide groove (11) pass through the force rod guide keyway (10), and are supported by the longitudinal force column (5) through the force rod guide keyway (10).

[0048] It should be noted that the entire test device is installed on the base plate (8). The lateral actuator (3) can reciprocate and extend through the support of the lateral support frame (2) and the lateral force column (4). When an external load affects the installation position, it can perform appropriate free movement through the groove on the lateral support frame (2). The longitudinal actuator (6) can reciprocate and extend through the support of the longitudinal support frame (7) and the longitudinal force column (5). The guide keyway (10) of the booster rod and the force column slide groove (11) ensure the axial stability during reciprocating loading. The flexible design of the booster rod (9) can smoothly transmit the changing force to the test piece (1).

[0049] Embodiment 2

[0050] The present application provides a composite loading method for a pendulum vibration absorber under a test state, the method comprising:

[0051] Step 1: Check whether the test piece has obvious scratches, pits or other surface damage; review whether the quality documents are complete.

[0052] Step 2: Equipment and tooling inspection: Check whether the test instruments and equipment have been inspected and calibrated by the metrology department. Check whether the test tooling is in good condition.

[0053] Specifically, step 2 includes:

[0054] Step 21. Check whether the mounting bolts are damaged. If damaged, replace them with new ones.

[0055] Step 22. Check whether all the connecting parts of the equipment are normal (whether there is any new damage or breakage);

[0056] Step 23. Check whether the hydraulic system is normal;

[0057] Step 24. Check the test bench for excess material.

[0058] Step 3: Install the test piece. The test piece is supported by a fixture, and the main blade pendulum absorber is fixed at the blade bushing position. The shaft, rocker arm and rocker arm mounting bolt structure are dummy parts, and the installation should simulate the actual installation environment. The shell is subjected to low-cycle loads, and low-cycle fatigue tests are performed. The direction of the rocker arm is parallel to the direction of the blade.

[0059] Step 4: Check for excess material. Before the test run, check for excess material.

[0060] Step 5: Test and debug. Open the test control software and start the pump station.

[0061] Step 6: Calibrate the test system. Calibrate the test system according to the sensor calibration certificate; connect the sensor to eliminate zero drift.

[0062] Step 7: Test debugging: Input commands in the test control software to debug the servo valve and actuator of the test system to ensure that the test system operates normally.

[0063] Step 8, test load adjustment. During the test of the first specimen, the high-cycle fatigue test load can be adjusted step by step. If the specimen is not damaged after 300,000 to 500,000 test loads, the fatigue test load can be adjusted. The static load remains unchanged, and the dynamic load increases by 10% to 30%. This process is repeated until the specimen is damaged or meets the design requirements. The initial test load of the next specimen is determined by this load.

[0064] Step 9: Test termination conditions. The test can be terminated if one of the following conditions occurs:

[0065] a. If cracks appear on the upper shell of the main blade swing absorber, the test can be terminated; if other structures are damaged, replace spare parts and continue the test;

[0066] b. If item a is not met, but the assessment purpose has been fully achieved, the test can be terminated after coordination with the design and strength departments.

[0067] In summary, the present application provides a composite loading device for a pendulum vibration absorber under a test state, which meets the installation accuracy requirements through hydraulic flexible loading and coordinated loading technology, achieves the technical indicators of coordinated loading accuracy in four directions, and improves the accuracy and durability requirements of the test.

Claims

1. A composite loading device for a pendulum vibration absorber in a test state, the device comprising a pendulum vibration absorber (1), a lateral support frame (2), a lateral actuator (3), a lateral force column (4), a longitudinal force column (5), a longitudinal actuator (6), a longitudinal support frame (7), a bottom plate (8), a force rod (9), a force rod guide keyway (10), and a force column slideway (11), wherein: The swing absorber (1) is supported by a fixture, and the main blade swing absorber is fixed at the position of the blade bushing. The rotating shaft, rocker arm and rocker arm mounting bolt structure are dummy parts. The installation should simulate the actual installation environment. The shell is subjected to low-cycle loads and low-cycle fatigue test assessment is carried out. The direction of the rocker arm is parallel to the direction of the blade. The support frame (2) is fixed to the bottom plate (8) by bolts, and the lateral actuator (3) is kept in a horizontal state. It is equipped with bolt holes, and the lateral actuator (3) is firmly connected by bolts. The lateral actuator (3) is the test system. The horizontal force column (4) is fixed to the bottom plate (8) by bolts and is equipped with a support platform to keep the horizontal actuator (3) in a horizontal state; the longitudinal force column (5) is fixed to the bottom plate (8) by bolts and is equipped with a support platform to keep the longitudinal actuator (7) in a horizontal state; the longitudinal actuator (6) is the action execution part of the test system for loading test and receiving control commands; the longitudinal support frame (7) is fixed to the bottom plate (8) by bolts and is equipped with a support platform to keep the longitudinal actuator (7) in a horizontal state. The longitudinal actuator (6) is kept in a horizontal state and is provided with bolt holes, and the longitudinal actuator (6) is firmly connected by bolts; the base plate (8) is fastened to the floor rail or steel platform of the factory by bolts, and the transverse support frame (2), the transverse force column (4), the longitudinal force column (5), and the longitudinal support frame (7) are accurately positioned on the base plate by laser positioning and installing positioning pins, and then threaded holes are expanded thereon to fix the transverse support frame (2), the transverse force column (4), the longitudinal force column (5) and the longitudinal support frame (7) to the base plate; One end of the force rod (9) is connected to the sensor on the longitudinal actuator (6), and the other end is connected to the pendulum vibration absorber (1), and can freely and flexibly reciprocate in the rolling linear ball bearing inside the longitudinal support frame (7). The force rod guide keyway (10) adopts a convex groove design, and the force rod (9) cannot rotate in the force column slideway (11) and can only reciprocate back and forth; the force column slideway (11) adopts a groove design, and the force rod guide keyway (10) cannot rotate in the force column slideway (11) and can only reciprocate back and forth.

2. The device according to claim 1, characterized in that The lateral actuator (3) comprises an action oil cylinder, a moving piston, an oil cylinder end cover, a hydraulic distribution valve group, a quick-change self-closing high-pressure oil pipe joint, a high-precision and high-sensitivity servo valve, a high-precision force sensor, a high-precision displacement sensor, and a joint ball joint support.

3. The device according to claim 1, characterized in that The longitudinal actuator (6) comprises an action oil cylinder, a moving piston, an oil cylinder end cover, a hydraulic distribution valve group, a quick-change self-closing high-pressure oil pipe joint, a high-precision and high-sensitivity servo valve, a high-precision force sensor, a high-precision displacement sensor, and a joint ball joint support.

4. The device according to claim 1, characterized in that The hydraulic working pressure of the lateral actuator (3) is 21 MPa, and the particle index is not greater than 5 um.

5. The device according to claim 1, characterized in that The oil cylinder and piston of the transverse actuator (3) are processed by aviation spraying technology. The piston is made of high-strength alloy steel and is hard chrome-plated on the surface. A hydraulic buffer pad is designed in the actuator to protect the piston from sudden loss of control and impact. The actuator adopts a composite seal composed of filled polytetrafluoroethylene and an O-ring. The piston rod guide part is sprayed with industrial plastics. Special materials are sprayed on the sealing surface between the oil cylinder and the piston.

6. The device according to claim 1, characterized in that The hydraulic working pressure of the longitudinal actuator (6) is 21 MPa, and the particle index is not greater than 5 um.

7. The device according to claim 1, characterized in that The longitudinal actuator (6) is processed between the oil cylinder and the piston by using aviation spraying technology. The piston is made of alloy steel and has a hard chrome plated surface. A hydraulic buffer pad is designed inside the actuator to protect the piston from sudden loss of control and impact. The actuator adopts a composite seal composed of filled polytetrafluoroethylene and an O-ring. The piston rod guide part is sprayed with industrial plastic to enhance the ability to resist lateral loads. Special materials are sprayed on the sealing surface between the oil cylinder and the piston.

8. The device according to claim 1, characterized in that The force rod (9) is made of polished rod technology with a finish of 3.2 and a tolerance of H6.

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