Engine mounting bracket fatigue test loading device and method

Abstract

The invention provides a fatigue test loading device for an engine mounting bracket. The fatigue test loading device comprises a large bottom plate; the engine simulation part is mounted on the engine mounting bracket; the simulation part weight counteracting assembly is installed on the large bottom plate, and the simulation part weight counteracting assembly is used for eliminating the influence of the weight of the engine simulation part on the loading error; the X-direction loading executing mechanism is mounted on the large bottom plate; the Z-direction loading executing mechanism is mounted on the large bottom plate; the Y-direction loading executing mechanism is mounted on the large bottom plate; the bottom of the three-direction loading connector is fixedly connected to the engine simulation part, and the upper portion of the three-direction loading connector is connected with the X-direction loading execution mechanism, the Z-direction loading execution mechanism and the Y-direction loading execution mechanism; the torque loading executing mechanism is mounted on the large bottom plate; meanwhile, the invention also provides an engine mounting bracket fatigue test loading method.

Description

Technical Field

[0001] This application belongs to the technical field of fatigue testing, and particularly relates to a fatigue test loading device and method for an engine mounting bracket. Background Art

[0002] The engine mounting bracket is a key component of a helicopter engine. The engine mounting bracket undertakes the important task of supporting the heart of the helicopter. Whether it has reliable fatigue performance directly affects the use safety of the helicopter. In order to master the fatigue performance of the engine mounting bracket, it is necessary to conduct a fatigue test on the engine mounting bracket on the ground, master the fatigue characteristics of the engine mounting bracket, and then give the life of the engine mounting bracket.

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

[0004] Object of the Invention: A fatigue test loading device for an engine mounting bracket is designed. The device adopts an internal force structure design, and can realize the simultaneous loading of 4 loads (X-direction, Y-direction, Z-direction and torque) at the center of gravity of the engine. The loading points are stable, there is no additional bending moment during the loading process, and the weight of the simulated part does not affect the loading accuracy, and the purpose of completing the fatigue test of the engine mounting bracket can be achieved in the most economical and efficient way.

[0005] In a first aspect, the present application provides a fatigue test loading device for an engine mounting bracket, and the device includes:

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

[0007] An engine simulation part, mounted on the engine mounting bracket;

[0008] A simulated part weight offset assembly, mounted on the large base plate, and the simulated part weight offset assembly is used to eliminate the influence of the weight of the engine simulation part on the loading load error;

[0009] An X-direction loading actuator, mounted on the large base plate;

[0010] A Z-direction loading actuator, mounted on the large base plate;

[0011] A Y-direction loading actuator, mounted on the large base plate;

[0012] A three-direction loading joint, the bottom of the three-direction loading joint is fixedly connected to the engine simulation part, and the upper part of the three-direction loading joint is respectively connected to the X-direction loading actuator, the Z-direction loading actuator, and the Y-direction loading actuator;

[0013] a torque loading actuator, mounted on the large base plate, the torque loading actuator being connected to the engine simulation component;

[0014] Among them, the X-direction loading actuator, the Z-direction loading actuator, the Y-direction loading actuator and the torque loading actuator can realize simultaneous loading of four loads in the X-direction, Y-direction, Z-direction and torque at the center of gravity of the engine simulation component.

[0015] Preferably, the dummy weight compensation component comprises:

[0016] A bracket, arranged on the large base plate;

[0017] a fixed pulley, arranged on the top of the bracket;

[0018] a steel wire rope, the steel wire rope passing through the fixed pulley, one end of the steel wire rope being connected to the center of gravity of the engine simulation component;

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

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

[0021] A T-shaped support member, mounted on the large base plate;

[0022] An X-direction loading cylinder, one end of which is connected to the T-shaped support, and the other end of which is connected to the three-direction loading joint.

[0023] Preferably, the device further comprises:

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

[0025] Preferably, the gantry comprises:

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

[0027] A crossbeam is connected to the vertical beam, and the crossbeam is used to install the Z-direction loading actuator.

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

[0029] A Z-direction loading cylinder, one end of which is connected to the crossbeam, and the other end of which is connected to the three-direction loading joint.

[0030] Preferably, the Y-direction loading actuator includes:

[0031] The Y-direction loading actuator, one end of the Y-direction loading actuator is connected to the vertical beam, and the other end of the Y-direction loading actuator is connected to the three-direction loading joint.

[0032] Preferably, the torque loading actuator includes:

[0033] An L-shaped support member, mounted on the large base plate;

[0034] A torque loading actuator, one end of the torque loading actuator is connected to the L-shaped support member;

[0035] A torque conversion device, one end of the torque conversion device is connected to the other end of the torque loading actuator, and the other end of the torque conversion device is connected to the engine simulation part by two fixing pins in a contact connection method.

[0036] In a second aspect, the present application also provides a fatigue test loading method for an engine mounting bracket, the method includes:

[0037] After the X-direction loading actuator receives the instruction from the control system, it starts to extend. When the loading load reaches the set value, the actuator holds, and the load needs to be held for a certain time. Then the control system issues an instruction to start unloading, and the X-direction loading actuator starts to retract;

[0038] After the Y-direction loading actuator receives the instruction from the control system, it starts to extend. When the loading load reaches the set value, the actuator holds, and the load needs to be held for a certain time. Then the control system issues an instruction to start unloading, and the Y-direction loading actuator starts to retract;

[0039] After the Z-direction loading actuator receives the instruction from the control system, it starts to extend. When the loading load reaches the set value, the actuator holds, and the load needs to be held for a certain time. Then the control system issues an instruction to start unloading, and the Z-direction loading actuator starts to retract;

[0040] In this way, a cycle is completed according to this process. The loadings in the three directions need to maintain the same phase, the load value accuracy is controllable, and it needs to be controlled according to a certain load spectrum;

[0041] The torque loading actuator receives the loading instruction from the control system, starts to extend, performs a one-way loading on the torque conversion device, and the torque conversion device converts the one-way loading load into a pure couple acting on the engine simulation part, realizing the torque loading at the center of gravity of the simulation part. After the torque reaches the predetermined value, the torque loading actuator holds. After a certain time, the control system issues an instruction for the torque loading actuator to unload, and the torque loading actuator retracts; In this way, a cycle of load loading is completed according to this process.

[0042] The present application has the following technical effects:

[0043] This fatigue test requires concentrated and coordinated loading at the simulated center of gravity of the engine. There are 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 moments when the actuator applies torque, and the loading points at the simulated center of gravity of the engine are prone to large displacements during loading, resulting in large test loading errors.

[0044] Therefore, through research, the present invention designs a fatigue test loading device for an engine mounting bracket. This device adopts an internal force structure design, which can achieve simultaneous loading of 4 loads (X-direction load, Y-direction load, Z-direction load, and torque) at the center of gravity of the engine. The loading points are stable, there is no additional bending moment during the loading process, and the weight of the simulated part does not affect the loading accuracy, and the purpose of completing the fatigue test of the engine mounting bracket can be achieved in the most economical and efficient way. Description of the Drawings

[0045] Figure 1 is the overall front schematic diagram of the structure of a fatigue test loading device for an engine mounting bracket provided by an embodiment of the present application;

[0046] Figure 2 is the overall reverse schematic diagram of the structure of a fatigue test loading device for an engine mounting bracket provided by an embodiment of the present application;

[0047] Figure 3 is the schematic diagram of a three-way loading joint provided by an embodiment of the present application;

[0048] Figure 4 is the schematic diagram of a torque conversion device provided by an embodiment of the present application;

[0049] Figure 5 is the schematic diagram of the main structure provided by an embodiment of the present application. Detailed Embodiments

[0050] The present application designs a fatigue test loading device for an engine mounting bracket. This device adopts an internal force structure design, which can achieve simultaneous loading of 4 loads (X-direction, Y-direction, Z-direction, and torque) at the center of gravity of the engine. The loading points are stable, there is no additional bending moment during the loading process, and the weight of the simulated part does not affect the loading accuracy, and the purpose of completing the fatigue test of the engine mounting bracket can be achieved in the most economical and efficient way.

[0051] The specific structure of a fatigue test loading device for an engine mounting bracket provided by the present application is as Figures 1 to 5 shown, mainly including:

[0052] 1. The large bottom plate of the device. All connectors, test objects, fixed jigs, loading devices, etc. are fixedly installed on the large bottom plate. While facilitating installation, it ensures that this device is an internal force structure and can be to a certain extent not restricted by the site;

[0053] 2. Test object connector. It includes the connections at the upper and lower ends of the test object, which play a role in connecting and fixing the test object 3, the loading device, and the large bottom plate 1 of the device. It has the ability to fix and transfer a certain load, and can simulate the boundary simulation conditions and load transfer paths of the test object;

[0054] 3. Test object (engine mounting bracket). It includes 3 assessment parts of the engine mounting bracket, such as Figure 1 shown, and is fixedly connected to the test object connector 2;

[0055] 4. Engine simulation part. It simulates the engine, connects the test object 3 and the loading actuator, has high stiffness and strong anti-torsion ability;

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

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

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

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

[0060] 9. Gantry. The bottom of the gantry is fixedly connected to the large bottom plate 1 of the device. The middle cross beam is connected to the Z-direction loading actuator cylinder 8 through a pressure plate. The installation position of the Z-direction loading actuator cylinder 8 can be appropriately adjusted to ensure the loading direction accuracy of the Z-direction loading actuator cylinder 8; One side vertical beam is connected to the Y-direction loading actuator cylinder 10 through a pressure plate. The installation position of the Y-direction loading actuator cylinder 10 can be appropriately adjusted to ensure the loading direction accuracy of the Y-direction loading actuator cylinder 10.

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

[0062] 11. Torque loading actuator cylinder. 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. The bottom is fixedly connected to the large bottom plate 1 of the device, and the upper part is connected to the torque loading actuator cylinder 11.

[0064] 13. Torque conversion device. One end is fixedly connected to the torque loading actuator cylinder 11, and the other end is connected to the engine simulator 4 by two fixing pins in a contact connection method. This device mainly realizes controlling the single-point actuator to output a pure couple, which acts on the engine simulator 4 to achieve torque loading, and no additional bending moment is generated.

[0065] 14. Three-way loading joint. The bottom is fixedly connected to the engine simulator 4, and the upper part is fixedly connected to three actuator cylinders, namely the X-direction loading actuator cylinder, the Y-direction loading actuator cylinder, and the Z-direction loading actuator cylinder.

[0066] This fatigue test needs to be centrally and coordinately loaded at the center of gravity of the engine simulator. There are 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 points at the center of gravity of the engine simulator are prone to large displacements during loading, resulting in large test loading errors.

[0067] Therefore, through research, the present invention designs a fatigue test loading device for an engine mounting bracket. This device adopts an internal force structure design, which can realize the simultaneous loading of 4 loads (X-direction load, Y-direction load, Z-direction load, and torque) at the center of gravity of the engine. The loading points are stable, no additional bending moment is generated during the loading process, and the weight of the simulator does not affect the loading accuracy, and the purpose of completing the fatigue test of the engine mounting bracket can be achieved in the most economical and efficient way.

[0068] In other embodiments of the present application, the loading device provided by the present application includes:

[0069] Large base plate. All connectors, test objects, fixing fixtures, loading devices, etc. are fixedly installed on the large base plate. While being convenient for installation, it ensures that this device has an internal force structure and is not restricted by the site to a certain extent;

[0070] Test object connector. It includes the connections at the upper and lower ends of the test object, which plays a role in connecting and fixing the test object, the loading device, and the large base plate of the device, has the ability to fix and transfer a certain load, and can simulate the boundary simulation conditions and load transfer paths of the test object;

[0071] Test object (engine mounting bracket). It includes 3 parts of the engine mounting bracket to be inspected, such as Figure 1 shown, and is fixedly connected to the test object connector;

[0072] Engine simulator. It simulates the engine, connects the test object and the loading actuator, has a large stiffness and strong anti-torsion ability;

[0073] Mock-up Weight Compensation Device. The bottom of the device is fixed on the large base plate of the device. The steel wire rope set in the device is connected to a counterweight at one end through a fixed pulley and to the center of gravity of the engine mock-up at the other end to eliminate the influence of the mock-up weight on the loading load error.

[0074] X-direction (heading) loading actuator. One end is connected to a T-shaped support member, and the other end is connected to a three-direction loading joint, serving as the X-direction loading actuator.

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

[0076] Z-direction (vertical) loading actuator. One end is connected to a gantry, and the other end is connected to a three-direction loading joint, serving as the Z-direction loading actuator.

[0077] Gantry. The bottom of the gantry is fixedly connected to the large base plate of the device. The middle cross beam is connected to the Z-direction loading actuator through a pressure plate, and the installation position of the Z-direction loading actuator can be appropriately adjusted to ensure the accuracy of the loading direction of the Z-direction loading actuator; one side vertical beam is connected to the Y-direction loading actuator through a pressure plate, and the installation position of the Y-direction loading actuator can be appropriately adjusted to ensure the accuracy of the loading direction of the Y-direction loading actuator.

[0078] Y-direction (lateral) loading actuator. One end is connected to a gantry, and the other end is connected to a three-direction loading joint, serving as the Y-direction loading actuator.

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

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

[0081] Torque conversion device. One end is fixedly connected to the torque loading actuator, and the other end is connected to the engine mock-up by a contact connection method through two fixed pins. This device mainly realizes controlling the output of a pure couple by a single-point actuator to act on the engine mock-up to achieve torque loading, and no additional bending moment is generated.

[0082] Three-direction loading joint. The bottom is fixedly connected to the engine mock-up, and the upper part is fixedly connected to three actuators, namely the X-direction loading actuator, the Y-direction loading actuator, and the Z-direction loading actuator.

[0083] In other embodiments of the present application, the present application provides an engine mounting bracket fatigue test loading method, including the following steps:

[0084] The loading process;

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

[0086] Among them, after the X-direction (heading) loading actuator receives the instruction from the control system, it starts to extend. When the loading load reaches the set value, the actuator holds. The load needs to be maintained for a certain period of time (the load accuracy needs to meet the requirements), and then the control system issues an instruction to start unloading, and the X-direction (heading) loading actuator starts to retract;

[0087] After the Y-direction (lateral) loading actuator receives the instruction from the control system, it starts to extend. When the loading load reaches the set value, the actuator holds. The load needs to be maintained for a certain period of time (the load accuracy needs to meet the requirements), and then the control system issues an instruction to start unloading, and the Y-direction (lateral) loading actuator starts to retract;

[0088] After the Z-direction (vertical) loading actuator receives the instruction from the control system, it starts to extend. When the loading load reaches the set value, the actuator holds. The load needs to be maintained for a certain period of time (the load accuracy needs to meet the requirements), and then the control system issues an instruction to start unloading, and the Z-direction (vertical) loading actuator starts to retract. In this way, a cycle is completed according to this process. The loadings in the three directions need to maintain the same phase, the load value accuracy is controllable, and it needs to be controlled according to a certain load spectrum.

[0089] Torque loading is achieved through the torque loading actuator and the torque conversion device. The torque loading actuator is controlled by the control system according to the given load spectrum. The torque loading actuator receives the loading instruction from the control system and starts to extend, applying a one-way load to the torque conversion device. The torque conversion device converts the one-way loading load into a pure couple acting on the engine simulator, realizing the torque loading at the center of gravity of the simulator. After the torque reaches the predetermined value, the torque loading actuator holds. After a certain period of time, the control system issues an instruction for the torque loading actuator to unload, and the torque loading actuator retracts. In this way, a cycle of load loading is completed according to this process.

Claims

1. An engine mounting bracket fatigue test loading device, characterized in that The device includes: A large base plate; wherein, an engine mounting bracket is mounted on the large base plate; An engine simulation component, mounted on the engine mounting bracket; A simulation component weight offset assembly, mounted on the large base plate, and the simulation component weight offset assembly is used to eliminate the influence of the weight of the engine simulation component on the loading load error; An X-direction loading actuator, mounted on the large base plate; A Z-direction loading actuator, mounted on the large base plate; A Y-direction loading actuator, mounted on the large base plate; A three-direction loading joint, the bottom of the three-direction loading joint is fixedly connected to the engine simulation component, and the upper part of the three-direction loading joint is respectively connected to the X-direction loading actuator, the Z-direction loading actuator, and the Y-direction loading actuator; A torque loading actuator, mounted on the large base plate, and the torque loading actuator is connected to the engine simulation component; Wherein, the X-direction loading actuator, the Z-direction loading actuator, the Y-direction loading actuator, and the torque loading actuator can realize the simultaneous loading of four loads in the X-direction, Y-direction, Z-direction, and torque at the center of gravity of the engine simulation component.

2. The device according to claim 1, characterized in that, The simulation component weight offset assembly includes: A bracket, arranged on the large base plate; A fixed pulley, arranged at the top of the bracket; A steel wire rope, the 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 simulation component; A counterweight, connected to the other end of the steel wire rope.

3. The device according to claim 1, characterized in that, The X-direction loading actuator includes: A T-shaped support member, mounted on the large base plate; An X-direction loading actuator cylinder, one end of the X-direction loading actuator cylinder is connected to the T-shaped support member, and the other end of the X-direction loading actuator cylinder is connected to the three-direction loading joint.

4. The device according to claim 1, characterized in that, The device further includes: A gantry, mounted on the large base plate, and the gantry is used to mount the Z-direction loading actuator and the Y-direction loading actuator.

5. The device according to claim 4, characterized in that, The gantry includes: A vertical beam, mounted on the large base plate, and the vertical beam is used to mount the Y-direction loading actuator; A cross beam, connected to the vertical beam, and the cross beam is used to mount the Z-direction loading actuator.

6. The device according to claim 5, wherein The Z-direction loading actuator includes: A Z-direction loading actuator cylinder, one end of the Z-direction loading actuator cylinder is connected to the cross beam, and the other end of the Z-direction loading actuator cylinder is connected to the three-direction loading joint.

7. The device according to claim 5, characterized in that, The Y-direction loading actuator includes: A Y-direction loading actuator cylinder, one end of the Y-direction loading actuator cylinder is connected to the vertical beam, and the other end of the Y-direction loading actuator cylinder is connected to the three-direction loading joint.

8. The device according to claim 1, characterized in that, The torque loading actuator includes: An L-shaped support member, mounted on the large base plate; A torque loading actuator cylinder, one end of the torque loading actuator cylinder is connected to the L-shaped support member; A torque conversion device, one end of the torque conversion device is connected to the other end of the torque loading actuator cylinder, and the other end of the torque conversion device is connected to the engine simulation component by two fixing pins in a contact connection method.

9. A fatigue test loading method for an engine mounting bracket, characterized in that, The method includes: After receiving the instruction from the control system, the X-direction loading actuator starts to extend. When the loading load reaches the set value, the actuator holds. The load needs to be maintained for a certain period of time, and then the control system issues an instruction to start unloading, and the X-direction loading actuator starts to retract; After receiving the instruction from the control system, the Y-direction loading actuator starts to extend. When the loading load reaches the set value, the actuator holds. The load needs to be maintained for a certain period of time, and then the control system issues an instruction to start unloading, and the Y-direction loading actuator starts to retract; After receiving the instruction from the control system, the Z-direction loading actuator starts to extend. When the loading load reaches the set value, the actuator holds. The load needs to be maintained for a certain period of time, and then the control system issues an instruction to start unloading, and the Z-direction loading actuator starts to retract; In this way, a cycle is completed according to this process. The loadings in the three directions need to maintain the same phase, the load value accuracy is controllable, and it needs to be controlled according to a certain load spectrum; The torque loading actuator receives the loading instruction from the control system and starts to extend, and performs a unidirectional loading on the torque conversion device. The torque conversion device converts the unidirectional loading load into a pure couple acting on the engine simulation part, realizing the torque loading at the center of gravity of the simulation part. After the torque reaches the predetermined value, the torque loading actuator holds. After a certain period of time, the control system issues an instruction for the torque loading actuator to unload, and the torque loading actuator retracts; In this way, a cycle of load loading is completed according to this process.

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