Test device for evaluating multi-dimensional service life of high-bearing-resistance supporting rod

Abstract

The invention discloses a test device for evaluating the multi-dimensional service life of a high-bearing-resistance supporting rod. The device comprises a cyclic load loading device which realizes accurate loading and measurement through a loading actuator cylinder, a counter-force support and a sensor; the guide rail control device is used for simulating an actual complex motion form by utilizing a guide rail, a sliding block and a joint bearing; the abrasion checking device achieves the function of simulating abrasion at the piston end and the fixed end in an actual complex motion form; the temperature control system is used for accurately controlling the environment temperature and the working temperature by virtue of a high and low temperature environment box and a hydraulic oil temperature machine; and the MTS structure test loading system is used for controlling oil inlet and outlet of a loading actuating cylinder and a resistance supporting rod and displaying sensor data in real time. According to the invention, multi-physics coupling conditions such as cyclic load, compound wear and high and low temperature environment can be simulated through tests, the wear resistance, sealing performance, fatigue performance and overall reliability of the resistance stay bar can be comprehensively evaluated, and effective technical support is provided for life prediction and reliability design of the resistance stay bar.

Description

Technical Field

[0001] This invention relates to the field of aerospace technology, and more specifically, to a test device and method for multi-dimensional life assessment of high load-bearing resistance struts. Background Technology

[0002] The high-load-bearing drag strut is a key load-bearing component in the landing gear system, and its performance directly affects the safety and overall reliability of the aircraft during takeoff and landing. In actual operation, this component frequently endures high-frequency, high-amplitude alternating tensile and compressive loads during takeoff and landing, thus placing extremely high demands on its durability, reliability, and overall performance. To accurately reflect the performance of the high-load-bearing drag strut under service conditions, a comprehensive life assessment is necessary through systematic fatigue loading tests simulating actual operating conditions. Such tests typically require input of specified values ​​of displacement, cyclic load, and temperature environment to reproduce the comprehensive stress states involved in various operating conditions such as takeoff and landing. This allows for the evaluation of the specimen's wear resistance, sealing performance, and structural integrity under long-term reciprocating motion, providing data support for the life prediction, reliability optimization, and maintenance cycle determination of the high-load-bearing drag strut device.

[0003] However, there is currently a lack of mature dedicated testing equipment and methods for life testing of such components. Existing equipment often has limited functionality, making it difficult to verify the comprehensive performance of multiple parameters under coupled conditions, and unable to accurately simulate the durability and failure behavior of components in real-world environments. Therefore, to systematically evaluate the wear resistance, sealing performance, fatigue performance, and overall reliability of the nose landing gear drag strut, it is urgent to develop a comprehensive testing device and supporting testing methods capable of achieving multi-dimensional and multi-parameter synergistic effects, thereby providing solid technical support for its life assessment and reliability design. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the shortcomings of the existing technology and provide a multi-dimensional life assessment test device for high load-bearing drag struts. This device can more realistically simulate the working state of the aircraft nose landing gear drag strut during takeoff and landing in actual flight, and comprehensively evaluate its working performance, thus providing effective technical support for the life assessment and reliability design of aircraft landing gear drag struts.

[0005] This invention provides a multi-dimensional life assessment test device for high load-bearing resistance struts, which is achieved through the following technical solutions: a cyclic load loading device, a guide rail control device, a wear assessment device, a temperature control system, and an MTS structure test loading system. The cyclic load loading device includes: a loading actuator, an actuator fixing bracket, a left reaction force bracket, a loading lug, a force sensor, and a displacement sensor. The two ends of the loading actuator are fixedly installed to the left reaction force bracket and the actuator fixing bracket, respectively. The movable end of the loading actuator is fixed to the loading lug by bolts. The loading lug is connected to the piston end of the resistance strut by a pin to form a whole and is placed in the slider on the guide rail. The force sensor is installed at the movable end of the loading actuator. The fixed end of the resistance strut is fixed to the bracket fixing lug on the right reaction force bracket. The displacement sensor is installed on the resistance strut and monitors the displacement of the resistance strut by monitoring the elongation and shortening of the resistance strut. The guide rail control device includes: a guide rail bracket, a guide rail, a pin, a slider, a slide rail fixing ear plate, and an ear plate spherical bearing; two parallel guide rails are respectively installed on the top surface of the guide rail bracket; the slider is screwed to the slide rail fixing ear plate, the slider is placed on the guide rail, and the upper part of the slide rail fixing ear plate is equipped with an ear plate spherical bearing for the pin to rotate; the guide rail bracket is fixedly connected to the floor by bolts. The wear assessment device includes a piston end wear assessment device and a fixed end wear assessment device. The piston end wear assessment device includes a rotating gear, a rack, an adapter flange, and a fixing fixture. A pin passes through the piston end of the resistance strut, the loading lug, the slide rail fixing lug, the adapter flange, and the rotating gear. The pin is engaged with the adapter flange via a hexagonal key, and the adapter flange is connected to the rotating gear via bolts. The rotating gear is then reinforced using a fixing fixture. The fixed end wear assessment device includes a servo cylinder, a servo cylinder support, a bushing, and a force transmission fixing rod. The fixed end mounting hole bushing is connected to the servo cylinder via bolts. The servo cylinder directly drives the bushing to rotate, causing the bushing to rotate relative to the fixed end lug hole, thus achieving the assessment of the fixed end spherical bearing. The temperature control system includes a special high and low temperature environment chamber, a hydraulic oil temperature controller, and a temperature sensor; the two oil ports of the resistance strut are respectively connected to the hydraulic oil temperature controller through hydraulic oil pipes, and the hydraulic oil temperature controller is equipped with a temperature sensor. The MTS structural test loading system controls the oil flow of the loading actuator and resistance strut, and displays the force and displacement data in real time.

[0006] The temperature control system includes an ambient temperature loading device and a working temperature loading device. The ambient temperature loading device encloses the resistance strut in a high-low temperature environment chamber (a specially customized high-low temperature environment chamber for the size of the resistance strut, essentially a cylindrical tube that can change temperature to enclose the resistance strut) and seals it with insulation cotton. The test ambient temperature is directly regulated by the high-low temperature environment chamber, and precise control is achieved through temperature feedback. The working temperature loading device uses a hydraulic oil temperature controller. Nozzle A and nozzle B on the resistance strut tube are connected to the hydraulic oil temperature controller through high-low temperature resistant hydraulic oil pipes. The hydraulic oil temperature controller has a built-in temperature sensor to stably control the working fluid temperature within the test requirement range: -55℃ to +100℃.

[0007] The MTS structural test loading system controls the loading actuator as follows: a hydraulic source is connected to the loading actuator via a servo valve, and the MTS structural test loading system controls the servo valve; the servo valve consists of a high-pressure oil inlet channel P, a system return oil channel T, and oil ports A and B. The reciprocating motion of the loading actuator is achieved by connecting the high-pressure oil inlet channel P and the system return oil channel T to oil ports A and B, respectively; when the high-pressure oil inlet channel P is connected to oil port A and the system return oil channel T is connected to oil port B, the loading actuator extends; when the high-pressure oil inlet channel P is connected to oil port B and the system return oil channel T is connected to oil port A, the loading actuator retracts.

[0008] The MTS structural test loading system controls the oil inlet and outlet of the resistance strut as follows: the resistance strut has a single-cavity structure with inlet and outlet oil holes. Oil enters the resistance strut through the inlet oil hole and is discharged through the outlet oil hole. The hydraulic power source is connected to the resistance strut through a proportional pressure reducing valve, and the MTS structural test loading system controls the proportional pressure reducing valve.

[0009] Compared with the prior art, the beneficial effects of the present invention are: This invention constructs a comprehensive test environment with multi-physics coupling: it innovatively integrates three major systems, namely cyclic load loading, rotational wear simulation and high and low temperature temperature change environment, to achieve multi-dimensional and full-condition synchronous assessment of the wear resistance, sealing performance and working reliability of high load-bearing resistance struts on a single test platform.

[0010] This invention achieves simultaneous verification under all operating conditions with high efficiency: this comprehensive testing environment changes the traditional testing device's mode of only being able to conduct single-item assessments, enabling the simultaneous application of mechanical loads, combined motion, and temperature change environments on a single device, greatly shortening the testing cycle. Its assessment results can truly reflect the comprehensive performance of the product under multi-field coupling effects, and in particular, can expose potential faults that are difficult to detect under single conditions, such as seal failures and material performance degradation, providing unprecedented comprehensive data support for product reliability assessment.

[0011] This invention designs a synergistic composite wear assessment mechanism: targeting the complex motion patterns of the resistance strut in actual working conditions, it innovatively combines the linear motion controlled by the guide rail, the rotational motion of the piston-end gear rack, and the rotation driven by the fixed-end servo electric cylinder, realizing accurate simulation of the wear condition of the joint bearing under the condition of simultaneously bearing axial force and rotational torque, far exceeding the assessment capability of traditional single motion patterns.

[0012] This invention significantly improves the realism and accuracy of wear assessment: the composite wear mechanism accurately reproduces the complex motion of the drag strut during takeoff and landing, involving both extension and rotation, ensuring that the wear condition of key components of the joint bearing is highly consistent with actual service conditions. The resulting wear data and life predictions are more accurate and reliable, effectively guiding design improvements and reducing the risk of field failures due to insufficient design verification.

[0013] This invention achieves intelligent coordinated control of load and motion: it adopts the MTS structural test loading system to simultaneously control the working state of the loading actuator and the resistance strut. Through a closed-loop control strategy of displacement control and pressure feedback, it ensures that while the resistance strut is displaced according to a predetermined curve, its internal pressure can also reach the specified load value in real time and accurately, thus guaranteeing the accurate reproduction of complex loading spectra and the synchronous coordination of actions in all dimensions.

[0014] This invention ensures accurate reproduction of the test process and high reliability of the results: the MTS structural test loading system controls the loading actuator and resistance strut through real-time feedback of displacement and pressure, ensuring that even under complex conditions such as changes in material properties due to temperature variations and fluctuations in the coefficient of friction, the load spectrum and motion trajectory of each test cycle remain highly consistent. This eliminates additional variables introduced by insufficient control precision, resulting in good repeatability and strong comparability of test data, providing a solid technical guarantee for accurately assessing product life and performance degradation. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall device. Figure 2 For guide rail control device, Figure 3 This is a piston end wear assessment device. Figure 4 For fixed end wear assessment system, Figure 5 Ambient temperature loading diagram, Figure 6 Operating temperature loading diagram, Figure 7 This is a schematic diagram of the loading system for MTS structural testing. Figure 8 This is a schematic diagram of a resistance strut device. Detailed Implementation

[0016] To better understand the above-mentioned objects, features, and advantages of the present invention, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. The described embodiments are merely some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this invention pertains. The terminology used herein is for the purpose of describing specific embodiments only and is not intended to limit the present invention.

[0017] Figure 1 The diagram shows the overall setup. The loading actuator 1 and the resistance strut 4 are fixed to the left reaction support 301 and the right reaction support 302, respectively. The loading actuator 1 is also mounted on the actuator fixing bracket 2 for secure fixation. The loading actuator 1 and the resistance strut 4 are supported by a guide rail bracket 6. They are connected to a pin shaft 8 via a loading lug 5 and positioned on a guide rail 7 on the guide rail bracket 6. The reciprocating extension and retraction of the loading actuator 1 provides a cyclic load to the resistance strut 4. Feedback is obtained from a force sensor on the loading actuator 1 and a displacement sensor on the resistance strut 4, allowing for real-time monitoring of the force and displacement of the resistance strut 4. The device is then tested under specified conditions.

[0018] Figure 2 As a guide rail control device, the loading lug 5 on the loading actuator cylinder 1 is connected to the piston end 101 of the resistance strut 4 as a whole by the pin shaft 8, and the slide rail fixing lug 10 with the slider 9 is installed to both ends of the pin shaft 8 and connected to the guide rail 7. This ensures that the piston end 101 of the resistance strut 4 will not have lateral or vertical displacement during the test elongation and contraction process, so that the structure remains stable.

[0019] Figure 3 The piston end 101 wear assessment device mainly includes the following components: a rotating gear 12, a rack 13, a transition flange 14, and a fixing clamp 15. Figure 3 As shown, the pin 8 is engaged with the adapter flange 14 via a hexagonal key. The adapter flange 14 is connected to the gear via bolts. The gear is further reinforced by two sets of fixing clamps 15. A rack 13 is provided under the guide rail bracket 6, which can cooperate with the gear. When the loading actuator cylinder 1 extends or retracts, it drives the pin 8 to slide on the guide rail 7, thereby driving the gear to rotate. This allows the wear performance of the piston end spherical bearing 201 of the piston end 101 to be assessed while the load is applied.

[0020] Figure 4 The wear assessment system for fixed end 102 mainly includes the following components: servo electric cylinder 16, servo electric cylinder support 17, bushing 18, and force transmission fixing rod 19. For example... Figure 4 As shown, the bushing 18 of the mounting hole of the fixed end 102 is connected to the servo cylinder 16 by bolts. The bushing 18 is directly driven to rotate by the servo cylinder 16, so that the bushing 18 rotates relative to the lug hole of the fixed end 102. In this way, the wear performance of the fixed end spherical bearing 202 at the fixed end 102 can be tested while applying load.

[0021] Figure 5 The ambient temperature loading diagram shows that the temperature of the resistance strut 4 is directly applied by the high and low temperature environment chamber 20. The high and low temperature environment chamber 20 adjusts the test temperature through temperature feedback to ensure the required test temperature.

[0022] Figure 6 The working temperature loading diagram shows that, in order to ensure the required temperatures for the wear resistance and sealing tests, the room temperature test, the high temperature test (+100℃), and the low temperature test (-55℃), nozzle A and nozzle B are connected to the hydraulic oil temperature controller 21 via high and low temperature resistant hydraulic oil pipes, respectively. The hydraulic oil temperature controller 21 is equipped with a temperature sensor 22, which can maintain the working fluid temperature at the required test temperature.

[0023] Figure 7 This is a schematic diagram of the MTS structural test loading system. The system integrates loading control and monitoring, including the control of the loading actuator 1, the control of the oil inlet and outlet of the resistance strut 4, and real-time data display of force and displacement sensors.

[0024] Figure 8 This is a schematic diagram of a resistance strut device, which is divided into a piston end 101 with a single earring and a fixed end 102 with two earrings.

[0025] like Figure 1 The diagram shows a multi-dimensional life assessment test device for a high-load-bearing resistance strut. The main structure includes a loading actuator 1, an actuator fixing bracket 2, a left reaction force bracket 301, a right reaction force bracket 302, a loading lug 5, a force sensor 23, a displacement sensor 24, a guide rail bracket 6, a guide rail 7, a slider 9, a guide rail fixing lug 10, a pin 8, a piston end spherical bearing 201, a fixed end spherical bearing 202, a rotating gear 12, a rack 13, a transition flange 14, a fixing clamp 15, a servo electric cylinder 16, a servo electric cylinder support 17, a bushing 18, a force transmission fixing rod 19, a high and low temperature environment chamber 20, a hydraulic oil temperature controller 21, and a temperature sensor 22.

[0026] like Figure 1The cyclic load loading device shown provides a specified cyclic load to the resistance strut 4. A bushing 18 is provided at the fixed end of the double lugs of the resistance strut 4. The bushing is placed outside the pin and the fixed end spherical bearing 202, and is connected and fixed in the lug of the bracket fixing plate 25 on the right reaction support 302. The loading actuator 1 is fixed to the left reaction support 301 by eight φ20 bolts. The left reaction support 301 and the right reaction support 302 are fixed to the ground rail by twelve M24 bolts. The loading actuator 1 is installed on the actuator fixing bracket 2 for fixation. The intermediate support is provided by the guide rail bracket 6. Both are connected to the pin 8 via the loading lug 5 and placed on the guide rail 7 on the guide rail bracket 6. The reciprocating extension and contraction of the loading actuator 1 applies a cyclic load to the resistance strut 4. Feedback is obtained from the force sensor on the loading actuator 1 and the displacement sensor on the resistance strut 4, allowing real-time monitoring of the force and displacement of the resistance strut 4. The strut is then tested under specified conditions.

[0027] like Figure 2 As shown, the guide rail control device provides a supporting carrier for the cyclic loading device and the resistance strut 4, ensuring that the loading direction remains horizontal at all times. The guide rail 7 is installed on the foundation via the guide rail bracket 6, and a slider 9 is installed on top. The slider 9 is connected to the slide rail fixing lug 10 by bolts. The slide rail fixing lug 10 is equipped with lug spherical bearings 203, which are installed on both sides of the pin 8. This structure can effectively constrain the lateral and vertical displacements generated by the test piece during contraction / elongation, ensuring the motion stability of the test piece.

[0028] like Figure 3 As shown, the wear testing device is used to evaluate the wear resistance of the piston end spherical bearing 201 and the fixed end spherical bearing 202 of the resistance strut 4 under high load conditions. The piston end 101 wear testing device mainly includes a rotating gear 12, a rack 13, an adapter flange 14, and a fixing clamp 15. The two racks 13 are fixed to the base plate of the guide rail bracket 6 by bolts. When the gears on both sides are connected to the pin shaft 8, they are first engaged with the adapter flange 14 by hexagonal keys. The adapter flanges on both sides are then connected to each gear by bolts and reinforced with two sets of fixing clamps 15. When the piston end 101 of the resistance strut extends or retracts, it will drive the gear to rotate along the rack 13, and the pin shaft 8 and the piston end spherical bearing 201 will also rotate accordingly, realizing the rotation of the piston end spherical bearing 201 relative to the ear hole under high load conditions. According to the design, when the gear diameter is φ1178mm and the piston end 101 extension distance is 642mm, a rotation angle of 62.5° can be achieved, which can meet the test requirements and the structural dimensions can be adjusted according to different test conditions.

[0029] like Figure 4As shown, the wear assessment device at the fixed end 102 mainly includes a servo cylinder 16, a servo cylinder support 17, a bushing 18, and a force transmission fixing rod 19. The bushing 18 at the double ear of the resistance support rod 4 is connected to the servo cylinder 16 by bolts. The servo cylinder 16 directly drives the bushing 18 to rotate, which can realize the rotation of the mounting hole shaft relative to the bolt shaft by 27.5°, simulating rotational wear under actual working conditions. The structural dimensions can also be adjusted according to different test conditions.

[0030] like Figure 5 , Figure 6 As shown, the temperature control system includes an ambient temperature loading device and a working temperature loading device. The ambient temperature loading device provides the required temperature change environment for the test. It wraps the resistance strut 4 with a high and low temperature environment chamber 20 and seals it with insulation cotton. The test ambient temperature is directly regulated by the environment chamber, and precise control is achieved through temperature feedback. The working temperature loading device mainly uses a hydraulic oil temperature controller 21. The A and B nozzles of the resistance strut 4 are connected to the hydraulic oil temperature controller 21 through high and low temperature resistant hydraulic oil pipes. The oil temperature controller has a built-in temperature sensor 22, which can stably control the working fluid temperature within the required test range (-55℃ to +100℃).

[0031] like Figure 7 As shown, the MTS structural test loading system integrates loading control and monitoring, including the control of the loading actuator 1, the control of the oil inlet and outlet of the resistance strut 4, and the real-time data display of the force sensor and displacement sensor 24.

[0032] The first part concerns the control of the loading actuator 1, which consists of a high-pressure oil inlet channel P, a system oil return channel T, and oil ports A and B. The reciprocating motion of the loading actuator 1 is achieved by connecting the high-pressure oil inlet channel P and the system oil return channel T to oil ports A and B, respectively. When the high-pressure oil inlet channel P is connected to oil port A and the system oil return channel T is connected to oil port B, the loading actuator 1 extends; when channel P is connected to oil port B and channel T is connected to oil port A, the loading actuator 1 retracts. Secondly, there is the control of the oil inlet and outlet of the resistance strut 4. Since the resistance strut 4 only has oil inlet and outlet holes when it is a single chamber, in actual process, the resistance strut 4 can only receive oil and then discharge it through the outlet. The piston end 101 of the resistance strut 4 is tested by two methods: tension and pressure.

[0033] The pressure test operation method is as follows: the high-pressure oil inlet channel P is connected to the oil port A, and the system return oil channel T is connected to the oil port B, which realizes the extension of the loading actuator 1. At the same time, oil is supplied to the resistance support rod 4, so that the loading actuator 1 and the resistance support rod 4 resist each other. Meanwhile, the force and displacement sensors are monitored in real time to ensure that the test conditions are met.

[0034] The tensile test is conducted as follows: the high-pressure oil inlet channel P is connected to the oil port B, and the system return oil channel T is connected to the oil port A, which realizes the contraction of the loading actuator 1. At the same time, the oil inlet of the resistance strut 4 is sealed to make the chamber a vacuum state, and the loading actuator 1 is contracted to the innermost end. The oil pressure of the loading actuator 1 is gradually reduced. At the same time, the proportional pressure reducing valve 11 of the resistance strut 4 is connected to adjust the abdominal pressure in real time. The piston end 101 is contracted and subjected to tensile test at the same time through the vacuum abdominal pressure of the resistance strut 4. The force and displacement sensors are monitored in real time to ensure that the test conditions are met.

[0035] The left reaction force support 301, right reaction force support 302, loading actuation fixed support, loading ear plate 5, guide rail support 6, slide rail fixed ear plate 10, rotating gear 12, adapter flange 14, fixing clamp 15, servo electric cylinder support 17, force transmission fixed rod 19, high and low temperature environment chamber 20, etc. of this invention are all specially designed, processed and assembled; the loading actuation cylinder 1, force sensor, displacement sensor, servo electric cylinder 16, temperature sensor 22, etc. are purchased from the market; all standard parts and raw materials are directly purchased from the market.

[0036] This invention presents a multi-dimensional life assessment test device for high-load-bearing drag struts, enabling cyclic loading tests on drag struts under different temperature conditions to comprehensively evaluate their wear resistance, sealing performance, and operational reliability. The device simulates cyclic loading, rotational wear, and temperature-dependent environments under actual operating conditions. Through the MTS structural test loading system, it assesses the drag strut under elongation and contraction states, overcoming the limitation of the drag strut's single-chamber oil port, which prevents assessment under tension during piston contraction. It also solves the problem of traditional testing methods failing to reproduce the multi-physics coupling effects. The test data provides effective support for structural optimization, life prediction, and reliability assessment of high-load-bearing drag struts, and is applicable to comprehensive performance evaluation of various aircraft landing gear drag strut devices.

[0037] The above description is only a preferred embodiment of the present invention. It should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A high bearing resistance strut multi-dimension life evaluation test device, characterized in that, It comprises a cyclic load loading device, a guide rail control device, a wear evaluation device, a temperature control system and an MTS structure test loading system. The cyclic load loading device comprises a loading actuator (1), an actuator fixing support (2), a left counter-force support (301), a loading lug plate (5), a force sensor (23) and a displacement sensor (24). The two ends of the loading actuator (1) are fixedly installed with the left counter-force support (301) and the actuator fixing support (2) respectively. The movable end of the loading actuator is fixed with the loading lug plate (5). The loading lug plate (5) is connected with the piston end (101) of the resistance support rod as a whole and is placed in the sliding block (9) on the guide rail (7). The force sensor (23) is installed on the movable end of the loading actuator (1). The fixed end (102) of the resistance support rod is fixed with the support lug plate (25) on the right counter-force support (302). The displacement sensor is installed on the resistance support rod (4). The guide rail control device comprises a guide rail support (6), a guide rail (7), a pin shaft (8), a sliding block (9), a sliding rail fixing lug plate (10) and a lug joint bearing (203). The sliding block is placed on the guide rail (7). The upper part of the sliding rail fixing lug plate (10) is provided with the lug joint bearing (203) for the rotation of the pin shaft (8). The wear evaluation device comprises a piston end wear evaluation device and a fixed end wear evaluation device. The piston end (101) wear evaluation device comprises a rotating gear (12), a rack (13), an adapter flange (14) and a fixed clamp (15). The pin shaft (8) penetrates through the resistance support rod piston end (101), the loading lug plate (5), the sliding rail fixing lug plate (10), the adapter flange (14) and the rotating gear (12). The pin shaft (8) is matched with the adapter flange (14) through a hexagonal key. The adapter flange (14) is connected with the rotating gear through bolts. The rotating gear is reinforced by using two sets of fixed clamps (15). The fixed end (102) wear evaluation device comprises a servo cylinder (16), a servo cylinder support (17), a shaft sleeve (18) and a force transmission fixed rod (19). The fixed end (102) mounting hole shaft sleeve (18) is connected with the servo cylinder (16) through bolts. The shaft sleeve (18) is directly driven to rotate by the servo cylinder (16), so that the shaft sleeve (18) rotates relative to the ear ring hole of the fixed end (102), thereby realizing the evaluation of the fixed end joint bearing (202). The temperature control system comprises a high-low temperature environment box (20) and a hydraulic oil temperature machine (21). The temperature sensor (22) is installed on the hydraulic oil temperature machine (21).

2. The high bearing resistance strut multi-dimension life evaluation test apparatus according to claim 1, wherein The two oil ports of the resistance support rod (4) are connected to the hydraulic oil temperature machine (21) through hydraulic oil pipes. The temperature sensor (22) is installed on the hydraulic oil temperature machine (21).

3. The high bearing resistance strut multi-dimension life evaluation test apparatus according to claim 1, wherein The temperature control system comprises an ambient temperature loading device and a working temperature loading device. The ambient temperature loading device wraps the resistance strut (4) by a high-low temperature environment box (20) and seals it with thermal insulation cotton. The test ambient temperature is directly adjusted by the high-low temperature environment box and is precisely controlled through temperature feedback. The working temperature loading device uses a hydraulic oil temperature machine (21). The nozzles A and B on the pipe body of the resistance strut (4) are connected to the hydraulic oil temperature machine (21) through high-low temperature resistant hydraulic oil pipes. The hydraulic oil temperature machine is provided with a temperature sensor (22) to stably control the working fluid temperature in the range of-55℃ to +100℃.

4. The high bearing resistance strut multi-dimension life evaluation test apparatus according to claim 1, wherein The MTS structure test loading system controls the loading actuator cylinder (1) in the following steps: the hydraulic source is connected to the loading actuator cylinder through a servo valve, and the MTS loading system controls the servo valve. The servo valve comprises a high-pressure oil inlet channel P, a system oil return channel T and oil ports A and B. The reciprocating movement of the loading actuator cylinder (1) is realized through the connection of the high-pressure oil inlet channel P and the system oil return channel T with the oil ports A and B. When the high-pressure oil inlet channel P is connected to the oil port A and the system oil return channel T is connected to the oil port B, the extension work of the loading actuator cylinder (1) is realized. When the high-pressure oil inlet channel P is connected to the oil port B and the system oil return channel T is connected to the oil port A, the contraction work of the loading actuator cylinder (1) is realized.

5. The high bearing resistance strut multi-dimension life evaluation test apparatus according to claim 1, wherein The MTS structure test loading system controls the resistance strut (4) to enter and exit oil in the following steps: the resistance strut (4) is provided with a single cavity structure, an oil inlet hole (nozzle A) and an oil outlet hole (nozzle B). The resistance strut (4) enters oil through the oil inlet hole and discharges the oil through the oil outlet hole. The hydraulic source is connected to the resistance strut through a proportional pressure reducing valve, and the MTS loading system controls the proportional pressure reducing valve.

6. The high bearing resistance strut multi-dimension life evaluation test apparatus according to claim 1, wherein Two guide rails (7) arranged in parallel are respectively mounted on the top surface of the guide rail support; the sliding block (9) is screwed with the sliding rail fixed lug plate (10), and the guide rail support (6) is fixedly connected with the floor through bolts.

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