Engine mounting bracket fatigue test loading device and method

Abstract

The application provides an engine mounting bracket fatigue test loading device, which comprises a large base plate, an engine simulation part installed on the engine mounting bracket, a simulation part weight offsetting assembly installed on the large base plate, the simulation part weight offsetting assembly being used for eliminating the influence of the weight of the engine simulation part on loading load error, an X-direction loading execution mechanism installed on the large base plate, a Z-direction loading execution mechanism installed on the large base plate, a Y-direction loading execution mechanism installed on the large base plate, a three-direction loading joint, the bottom of the three-direction loading joint being fixedly connected to the engine simulation part, and the upper part of the three-direction loading joint being connected to the X-direction loading execution mechanism, the Z-direction loading execution mechanism and the Y-direction loading execution mechanism respectively, and a torque loading execution mechanism installed on the large base plate.

Description

Technical Field

[0001] This application belongs to the field of fatigue testing technology, specifically relating to a fatigue testing loading device and method for an engine mounting bracket. Background Technology

[0002] The engine mounting bracket is a critical component of the helicopter engine, bearing the important responsibility of supporting the helicopter's engine. Its reliable fatigue performance directly affects the helicopter's operational safety. To understand the fatigue performance of the engine mounting bracket, ground-based fatigue tests are necessary to determine its fatigue characteristics and ultimately its lifespan.

[0003] Currently, there is no engine mounting bracket fatigue testing device that centrally coordinates the loading at the simulated center of gravity, making it impossible to simulate this test economically and efficiently. Summary of the Invention

[0004] Purpose of the invention: A fatigue testing loading device for engine mounting brackets was designed. The device adopts an internal force-bearing structure design, which can simultaneously load four loads (X-axis, Y-axis, Z-axis and torque) at the center of gravity of the engine. The loading point is stable, there is no additional bending moment during the loading process, and the weight of the simulated part does not affect the loading accuracy. It can achieve the purpose of completing the fatigue test of engine mounting brackets in the most economical and efficient way.

[0005] In a first aspect, this application provides a fatigue testing loading device for an engine mounting bracket, the device comprising:

[0006] A large base plate; wherein the engine mounting bracket is mounted on the large base plate;

[0007] An engine simulator is mounted on the engine mounting bracket;

[0008] A simulated component weight offset assembly is mounted on the large base plate. The simulated component weight offset assembly is used to eliminate the influence of the weight of the engine simulated component on the loading load error.

[0009] An X-axis loading actuator is mounted on the large base plate;

[0010] The Z-axis loading actuator is mounted on the large base plate;

[0011] The Y-axis loading actuator is mounted on the large base plate;

[0012] The three-way loading joint has its bottom fixedly connected to the engine simulation component, and its upper part is connected to the X-axis loading actuator, the Z-axis loading actuator, and the Y-axis loading actuator, respectively.

[0013] A torque loading actuator is mounted on the base plate and is connected to the engine simulation component.

[0014] The X-axis loading actuator, the Z-axis loading actuator, the Y-axis loading actuator, and the torque loading actuator are capable of simultaneously loading four loads—X-axis, Y-axis, Z-axis, and torque—at the center of gravity of the engine simulator.

[0015] Preferably, the simulated component weight offset assembly includes:

[0016] The bracket is installed on the large base plate;

[0017] A fixed pulley is located at the top of the bracket;

[0018] A steel wire rope passes through the fixed pulley, and one end of the steel wire rope is connected to the center of gravity of the engine simulator.

[0019] A counterweight is attached to the other end of the wire rope.

[0020] Preferably, the X-direction loading actuator includes:

[0021] T-shaped support members are installed on the large base plate;

[0022] An X-axis loading actuator is provided, with one end connected to the T-shaped support and the other end connected to the three-axis loading connector.

[0023] Preferably, the device further includes:

[0024] A gantry frame is installed on the large base plate, and the gantry frame is used to install the Z-axis loading actuator and the Y-axis loading actuator.

[0025] Preferably, the gantry frame includes:

[0026] A vertical beam is installed on the large base plate, and the vertical beam is used to install the Y-axis loading actuator.

[0027] A crossbeam, connected to the vertical beam, is used to mount the Z-axis loading actuator.

[0028] Preferably, the Z-axis loading actuator includes:

[0029] The Z-axis loading actuator has one end connected to the crossbeam and the other end connected to the three-axis loading joint.

[0030] Preferably, the Y-axis loading execution mechanism includes:

[0031] The Y-axis loading actuator has one end connected to the vertical beam and the other end connected to the three-axis loading joint.

[0032] Preferably, the torque loading actuator includes:

[0033] L-shaped support members are installed on the large base plate;

[0034] A torque-loaded actuating cylinder, one end of which is connected to the L-shaped support member;

[0035] A torque conversion device, one end of which is connected to the other end of the torque loading actuating cylinder, and the other end of which is connected to the engine simulation component via two fixing pins in a contact connection method.

[0036] Secondly, this application also provides a fatigue test loading method for an engine mounting bracket, the method comprising:

[0037] After receiving the command from the control system, the X-axis loading actuator cylinder begins to extend. When the load reaches the set value, the actuator cylinder holds the load for a certain period of time. Then, the control system issues a command to start unloading, and the X-axis loading actuator cylinder begins to retract.

[0038] After receiving the command from the control system, the Y-axis loading actuator cylinder begins to extend. When the load reaches the set value, the actuator cylinder holds the load for a certain period of time. Then, the control system issues a command to start unloading, and the Y-axis loading actuator cylinder begins to retract.

[0039] After receiving the command from the control system, the Z-axis loading actuator cylinder begins to extend. When the load reaches the set value, the actuator cylinder holds the load for a certain period of time. Then, the control system issues a command to start unloading, and the Z-axis loading actuator cylinder begins to retract.

[0040] Thus, following this process to complete one cycle, the loads in the three directions must maintain phase consistency, the load value accuracy must be controllable, and they must be controlled according to a certain load spectrum;

[0041] The torque loading actuator receives the loading command from the control system and begins to extend, applying unidirectional loading to the torque conversion device. The torque conversion device converts the unidirectional load into a pure torque acting on the engine simulation component, achieving torque loading at the center of gravity of the simulation component. After the torque reaches the predetermined value, the torque loading actuator holds. After a certain period of time, the control system issues a command to unload the torque loading actuator, and the torque loading actuator retracts. In this way, one cycle of load loading is completed.

[0042] This application has the following technical effects:

[0043] The fatigue test requires centralized and coordinated loading at the simulated center of gravity of the engine, with a total of 4 loading loads (X-direction load, Y-direction load, Z-direction load and torque load). The fatigue test device designed before this device will generate additional bending moment when the actuator applies torque, and the loading point at the simulated center of gravity of the engine is prone to large displacement during loading, resulting in large test loading error.

[0044] Therefore, through research, this invention designs a fatigue test loading device for engine mounting brackets. The device adopts an internal force-bearing structure design, which can simultaneously load four loads (X-direction load, Y-direction load, Z-direction load and torque) at the center of gravity of the engine. The loading point is stable, there is no additional bending moment during the loading process, and the weight of the simulated part does not affect the loading accuracy. It can achieve the purpose of completing the fatigue test of engine mounting brackets in the most economical and efficient way. Attached Figure Description

[0045] Figure 1 This is a front view of the overall structure of a fatigue testing loading device for an engine mounting bracket provided in an embodiment of this application;

[0046] Figure 2 This is a schematic diagram of the overall reverse side of an engine mounting bracket fatigue test loading device provided in an embodiment of this application;

[0047] Figure 3 This is a schematic diagram of a three-way loading connector provided in an embodiment of this application;

[0048] Figure 4 This is a schematic diagram of a torque conversion device provided in an embodiment of this application;

[0049] Figure 5 This is a schematic diagram of the main structure provided in the embodiments of this application. Detailed Implementation

[0050] This application designs a fatigue test loading device for engine mounting brackets. The device adopts an internal force-bearing structure design, which can simultaneously load four loads (X-axis, Y-axis, Z-axis and torque) at the center of gravity of the engine. The loading point is stable, there is no additional bending moment during the loading process, and the weight of the simulated part does not affect the loading accuracy. It can achieve the purpose of completing the fatigue test of engine mounting brackets in the most economical and efficient way.

[0051] This application provides a specific structure for a fatigue testing loading device for an engine mounting bracket, as follows: Figures 1-5 As shown, the main contents include:

[0052] 1. Base plate of the device. All connectors, test objects, fixing fixtures, loading devices, etc. are fixedly installed on the base plate, which facilitates installation and ensures that the device is an internally stressed structure, which can be used without being restricted by the site to a certain extent;

[0053] 2. Test object connectors. These include the connections at the top and bottom ends of the test object, serving to connect and fix the test object 3, the loading device, and the device's base plate 1. They have the ability to fix and transmit a certain load, and can simulate the boundary conditions and load transmission path of the test object.

[0054] 3. Test Object (Engine Mounting Bracket). This includes three test components: the engine mounting bracket, such as... Figure 1 As shown, it is fixedly connected to the test object connector 2;

[0055] 4. Engine Simulator. This simulates an engine, connecting test object 3 and the loading actuator. It features high rigidity and strong torsional resistance.

[0056] 5. Simulation component weight compensation assembly. The bottom of this assembly is fixed to the base plate 1 of the device. The steel wire rope of the device is connected to the counterweight at one end through a fixed pulley, and the other end is connected to the center of gravity of the engine simulation component 4 to eliminate the influence of the simulation component weight on the loading load error;

[0057] 6. X-axis (yaw) loading actuator cylinder. One end is connected to the T-shaped support 7, and the other end is connected to the three-way loading joint 14, which is the X-axis loading actuator.

[0058] 7. T-shaped support component. The bottom is fixedly connected to the base plate, and the upper part is connected to the X-axis loading actuation cylinder 6 through a pressure plate. The installation position of the X-axis loading actuation cylinder 6 can be adjusted appropriately to ensure the loading direction accuracy of the X-axis loading actuation cylinder 6.

[0059] 8. Z-axis (vertical) loading actuator. One end is connected to the gantry 9, and the other end is connected to the three-way loading joint 14, which is the Z-axis loading actuator.

[0060] 9. Gantry Frame. The bottom of the gantry frame is fixedly connected to the base plate 1 of the device. The middle crossbeam is connected to the Z-axis loading actuator 8 through a pressure plate. The installation position of the Z-axis loading actuator 8 can be adjusted appropriately to ensure the loading direction accuracy of the Z-axis loading actuator 8. The vertical beam on one side is connected to the Y-axis loading actuator 10 through a pressure plate. The installation position of the Y-axis loading actuator 10 can be adjusted appropriately to ensure the loading direction accuracy of the Y-axis loading actuator 10.

[0061] 10. Y-axis (lateral) loading actuator. One end is connected to the gantry 9, and the other end is connected to the three-way loading joint 14, which is the Y-axis loading actuator.

[0062] 11. Torque loading actuator. One end is fixedly connected to the L-shaped support 12, and the other end is fixedly connected to the torque conversion device 13, which is the torque loading actuator.

[0063] 12. L-shaped support component. Bottom fixed connection device base plate 1, upper part connected to torque loading actuation cylinder 11.

[0064] 13. Torque conversion device. One end is fixedly connected to the torque loading actuating cylinder 11, and the other end is connected to the engine simulation component 4 through two fixed pins in a contact connection method. This device is mainly used to realize the control of the single-point actuator to output a pure torque couple to act on the engine simulation component 4 to achieve torque loading, without generating additional bending moment.

[0065] 14. Three-way loading connector. The bottom is fixedly connected to the engine simulation component 4, and the upper part is fixedly connected to the three actuating cylinders: the X-axis loading actuating cylinder, the Y-axis loading actuating cylinder, and the Z-axis loading actuating cylinder.

[0066] The fatigue test requires centralized and coordinated loading at the simulated center of gravity of the engine, with a total of 4 loading loads (X-direction load, Y-direction load, Z-direction load and torque load). The fatigue test device designed before this device will generate additional bending moment when the actuator applies torque, and the loading point at the simulated center of gravity of the engine is prone to large displacement during loading, resulting in large test loading error.

[0067] Therefore, through research, this invention designs a fatigue test loading device for engine mounting brackets. The device adopts an internal force-bearing structure design, which can simultaneously load four loads (X-direction load, Y-direction load, Z-direction load and torque) at the center of gravity of the engine. The loading point is stable, there is no additional bending moment during the loading process, and the weight of the simulated part does not affect the loading accuracy. It can achieve the purpose of completing the fatigue test of engine mounting brackets in the most economical and efficient way.

[0068] In other embodiments of this application, the loading device provided in this application includes:

[0069] Large base plate. All connectors, test objects, fixing fixtures, loading devices, etc. are fixedly installed on the large base plate, which facilitates installation while ensuring that the device is an internally stressed structure, and is not limited by the site to a certain extent;

[0070] Test object connector. This connector passes through the upper and lower ends of the test object, serving to connect and fix the test object, loading device, and base plate of the device. It has the ability to fix and transmit a certain load, and can simulate the boundary conditions and load transmission path of the test object.

[0071] Test subject (engine mounting bracket). The test component included three engine mounting brackets, such as... Figure 1 As shown, it is fixedly connected to the test object connector;

[0072] Engine simulator. It simulates an engine, connecting the test object and the loading actuator; it has high rigidity and strong torsional resistance.

[0073] The device is designed to counteract the weight of the simulated component. Its base is fixed to the main plate of the equipment. A steel cable is connected to a counterweight at one end via a fixed pulley, and to the center of gravity of the engine simulation component at the other end, thus eliminating the influence of the simulated component's weight on the loading error.

[0074] X-axis (yaw) loading actuator cylinder. One end is connected to a T-shaped support, and the other end is connected to a three-way loading joint, which is the X-axis loading actuator.

[0075] T-shaped support component. The bottom is fixedly connected to the base plate, and the upper part is connected to the X-axis loading actuator cylinder through a pressure plate. The installation position of the X-axis loading actuator cylinder can be adjusted appropriately to ensure the loading direction accuracy of the X-axis loading actuator cylinder.

[0076] Z-axis (vertical) loading actuator. One end is connected to the gantry, and the other end is connected to the three-way loading joint, which is the Z-axis loading actuator.

[0077] Gantry frame. The bottom of the gantry frame is fixedly connected to the base plate of the device. The middle crossbeam is connected to the Z-axis loading actuator cylinder through a pressure plate. The installation position of the Z-axis loading actuator cylinder can be adjusted appropriately to ensure the loading direction accuracy of the Z-axis loading actuator cylinder. One side vertical beam is connected to the Y-axis loading actuator cylinder through a pressure plate. The installation position of the Y-axis loading actuator cylinder can be adjusted appropriately to ensure the loading direction accuracy of the Y-axis loading actuator cylinder.

[0078] Y-axis (lateral) loading actuator. One end is connected to the gantry, and the other end is connected to the three-way loading joint, which is the Y-axis loading actuator.

[0079] Torque-loaded actuated cylinder. One end is fixedly connected to an L-shaped support, and the other end is fixedly connected to a torque conversion device, serving as a torque-loaded actuator.

[0080] L-shaped support component. The bottom is fixedly connected to the base plate, and the upper part is connected to the torque loading actuator.

[0081] Torque conversion device. One end is fixedly connected to the torque loading actuating cylinder, and the other end is connected to the engine simulation component via two fixing pins in a contact connection method. This device is mainly used to control the output of a single-point actuator to generate a pure torque couple, which acts on the engine simulation component to achieve torque loading without generating additional bending moment.

[0082] Three-way loading connector. The bottom is fixedly connected to the engine simulation component, and the upper part is fixedly connected to three actuating cylinders: the X-axis loading actuating cylinder, the Y-axis loading actuating cylinder, and the Z-axis loading actuating cylinder.

[0083] In other embodiments of this application, a fatigue test loading method for an engine mounting bracket is provided, comprising the following steps:

[0084] The loading process;

[0085] The X-axis (heading) loading actuator, Y-axis (lateral) loading actuator, and Z-axis (vertical) loading actuator are all controlled by the control system to apply specific loads according to a given load spectrum.

[0086] The X-axis (heading) loading actuator cylinder extends after receiving instructions from the control system. When the load reaches the set value, the actuator cylinder holds the load for a certain period of time (the load accuracy must meet the requirements). Then, the control system issues an instruction to start unloading, and the X-axis (heading) loading actuator cylinder begins to retract.

[0087] After receiving the command from the control system, the Y-axis (lateral) loading actuator cylinder begins to extend. When the loaded load reaches the set value, the actuator cylinder holds the load for a certain period of time (the load accuracy must meet the requirements). Then, the control system issues a command to start unloading, and the Y-axis (lateral) loading actuator cylinder begins to retract.

[0088] After receiving instructions from the control system, the Z-axis (vertical) loading actuator extends. Once the load reaches the set value, the actuator holds the load for a certain period (load accuracy must meet requirements). Then, the control system issues a command to begin unloading, and the Z-axis (vertical) loading actuator retracts. This process completes one cycle. Loading in all three directions must maintain phase consistency, load value accuracy must be controllable, and the load must be controlled according to a specific load spectrum.

[0089] Torque loading is achieved through a torque loading actuator and a torque conversion device. The torque loading actuator is controlled by the control system according to a given load spectrum. Upon receiving a loading command from the control system, the torque loading actuator extends to apply a unidirectional load to the torque conversion device. The torque conversion device converts the unidirectional load into a pure torque acting on the engine simulator, achieving torque loading at the simulator's center of gravity. Once the torque reaches a predetermined value, the torque loading actuator holds its position. After a certain period, the control system issues a command to unload the torque loading actuator, which then retracts. This process completes one cycle of load loading.

Claims

1. A fatigue testing loading device for an engine mounting bracket, characterized in that, The device includes: A large base plate; wherein the engine mounting bracket is mounted on the large base plate; An engine simulator is mounted on the engine mounting bracket; A simulated component weight offset assembly is mounted on the large base plate. The simulated component weight offset assembly is used to eliminate the influence of the weight of the engine simulated component on the loading load error. An X-axis loading actuator is mounted on the large base plate; The Z-axis loading actuator is mounted on the large base plate; The Y-axis loading actuator is mounted on the large base plate; The three-way loading joint has its bottom fixedly connected to the engine simulation component, and its upper part is connected to the X-axis loading actuator, the Z-axis loading actuator, and the Y-axis loading actuator, respectively. A torque loading actuator is mounted on the base plate and is connected to the engine simulation component. The X-axis loading actuator, the Z-axis loading actuator, the Y-axis loading actuator, and the torque loading actuator can simultaneously apply four loads—X-axis, Y-axis, Z-axis, and torque—at the center of gravity of the engine simulator. The torque loading actuator includes: L-shaped support members are installed on the large base plate; A torque-loaded actuating cylinder, one end of which is connected to the L-shaped support member; A torque conversion device, one end of which is connected to the other end of the torque loading actuating cylinder, and the other end of which is connected to the engine simulation component via two fixing pins in a contact connection method.

2. The apparatus according to claim 1, characterized in that, The simulated component weight offset assembly includes: The bracket is installed on the large base plate; A fixed pulley is located at the top of the bracket; A steel wire rope passes through the fixed pulley, and one end of the steel wire rope is connected to the center of gravity of the engine simulator. A counterweight is attached to the other end of the wire rope.

3. The apparatus according to claim 1, characterized in that, The X-direction loading execution mechanism includes: T-shaped support members are installed on the large base plate; An X-axis loading actuator is provided, with one end connected to the T-shaped support and the other end connected to the three-axis loading connector.

4. The apparatus according to claim 1, characterized in that, The device further includes: A gantry frame is installed on the large base plate, and the gantry frame is used to install the Z-axis loading actuator and the Y-axis loading actuator.

5. The apparatus according to claim 4, characterized in that, The gantry frame includes: A vertical beam is installed on the large base plate, and the vertical beam is used to install the Y-axis loading actuator. A crossbeam, connected to the vertical beam, is used to mount the Z-axis loading actuator.

6. The apparatus according to claim 5, characterized in that, The Z-axis loading execution mechanism includes: The Z-axis loading actuator has one end connected to the crossbeam and the other end connected to the three-axis loading joint.

7. The apparatus according to claim 5, characterized in that, The Y-axis loading execution mechanism includes: The Y-axis loading actuator has one end connected to the vertical beam and the other end connected to the three-axis loading joint.

8. A fatigue test loading method for an engine mounting bracket, characterized in that, The method is applied to the apparatus as described in any one of claims 1-7, and the method comprises: After receiving the command from the control system, the X-axis loading actuator cylinder begins to extend. When the load reaches the set value, the actuator cylinder holds the load for a certain period of time. Then, the control system issues a command to start unloading, and the X-axis loading actuator cylinder begins to retract. After receiving the command from the control system, the Y-axis loading actuator cylinder begins to extend. When the load reaches the set value, the actuator cylinder holds the load for a certain period of time. Then, the control system issues a command to start unloading, and the Y-axis loading actuator cylinder begins to retract. After receiving the command from the control system, the Z-axis loading actuator cylinder begins to extend. When the load reaches the set value, the actuator cylinder holds the load for a certain period of time. Then, the control system issues a command to start unloading, and the Z-axis loading actuator cylinder begins to retract. Thus, following this process to complete one cycle, the loads in the three directions must maintain phase consistency, the load value accuracy must be controllable, and they must be controlled according to a certain load spectrum; The torque loading actuator receives the loading command from the control system and begins to extend, applying unidirectional loading to the torque conversion device. The torque conversion device converts the unidirectional load into a pure torque acting on the engine simulation component, achieving torque loading at the center of gravity of the simulation component. After the torque reaches the predetermined value, the torque loading actuator holds. After a certain period of time, the control system issues a command to unload the torque loading actuator, and the torque loading actuator retracts. In this way, one cycle of load loading is completed.

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