Horizontal tail steering engine and horizontal tail connector load force transmission device and test method

Abstract

The invention provides a horizontal tail steering engine and horizontal tail connection joint load force transmission device and a test method, which are used for simulating test boundary connection conditions and designing force transmission and loading of a horizontal tail steering engine and a horizontal tail connection joint by combining an assembly structure of the horizontal tail steering engine and the horizontal tail connection joint of a helicopter and load and force transmission characteristics of the horizontal tail of the helicopter. When the device is used for carrying out the fatigue test on the horizontal tail steering engine and the horizontal tail connector of the helicopter, the load force transmission characteristics of the horizontal tail steering engine and the horizontal tail connector can be accurately simulated, the performance is fully verified, and the fatigue life of the structure is obtained.

Description

Technical Field

[0001] This invention belongs to the field of helicopter horizontal stabilizer fatigue testing technology, specifically relating to a load transmission device and test method for the horizontal stabilizer servo and horizontal stabilizer connection joint. Background Technology

[0002] The horizontal stabilizer is a key structural component for enhancing helicopter flight stability, playing a crucial role in flight stability and hovering. In actual flight, the aerodynamic interference of the horizontal stabilizer has a significant impact on the helicopter's flight quality, performance, and vibration characteristics. Therefore, providing a precise fatigue testing environment to evaluate the horizontal stabilizer servo motor and its connection joint, determine its fatigue performance and weak points, identify the load transmission path between the servo motor and the horizontal stabilizer, and accurately assess the service life of the helicopter's horizontal stabilizer and its connection joint are of paramount importance.

[0003] Currently, due to shortcomings in boundary simulation and test loading technology for fatigue testing of helicopter horizontal stabilizer servo motors and horizontal stabilizer connecting joints, my country does not yet have a corresponding fatigue testing loading device for helicopter horizontal stabilizer servo motors and horizontal stabilizer connecting joints, and therefore cannot carry out precise fatigue test loading. Summary of the Invention

[0004] This invention provides a load transmission device and test method for the horizontal stabilizer servo and horizontal stabilizer connection joint, which is used for fatigue testing of the horizontal stabilizer servo and horizontal stabilizer connection joint of helicopters. Using the device of this invention to conduct fatigue testing of the horizontal stabilizer servo and horizontal stabilizer connection joint can ensure accurate simulation of load transmission between the horizontal stabilizer servo and horizontal stabilizer connection joint and between the horizontal stabilizer, fully verify the fatigue performance of the horizontal stabilizer servo and horizontal stabilizer connection joint and obtain the fatigue life of the structure.

[0005] The first aspect of the present invention provides a load transmission device for a horizontal tail servo and a horizontal tail connecting joint, comprising: a left connecting support 1 of an upper support plate, an upper support plate 2, a servo load loading joint assembly 3, a right connecting support 4 of an upper support plate, a lower support plate 5, a lower support plate fixing support 6, a test bench base plate 7, and an actuator fixing support 8. The left side connecting support 1 and the right side connecting support 4 of the upper support plate are inverted L-shaped structures, which are set opposite each other on the test bench base plate 7 to form a portal frame structure with a break in the middle. The upper support plate 2 is connected between the left connecting support 1 and the right connecting support 4 of the upper support plate, and the lower support plate fixing support 6 is set on the test bench base plate 7 and located below the upper support plate 2. The test piece for the horizontal tail servo and the horizontal tail connection joint is set on the upper support plate 2, and the tail passes through the through hole on the upper support plate 2 and is connected to the lower support plate fixed support 6 through the lower support plate 5; The ground rail platform is vertically set on the side of the test bench base plate 7. The actuator fixing support 8 is set on the ground rail platform. One end of the actuator is connected to the actuator fixing support 8, and the other end is connected to the horizontal tail servo and horizontal tail connection joint test piece through the servo load loading joint assembly 3. The actuator and the horizontal stabilizer servo are connected to the horizontal stabilizer at a predetermined angle to the horizontal plane of the test piece.

[0006] Optionally, the upper support plate 2, the lower support plate 5, and the test piece for the horizontal tail servo and horizontal tail connection joint are riveted together.

[0007] Optionally, the servo load loading connector assembly 3 and the horizontal tail servo and horizontal tail connection connector test piece are connected by a double-ear and a triple-ear structure, with the horizontal tail servo connection bolt 9 passing through the middle.

[0008] Optionally, the upper support plate 2 is provided with an elongated hole, which can move laterally relative to the left connecting support 1 and the right connecting support 4 of the upper support plate, thereby driving the horizontal tail servo and the horizontal tail connecting joint test piece to move laterally.

[0009] Optionally, the ground rail platform is a wall-mounted sliding platform perpendicular to the ground, and the actuator fixed support 8 can move up and down along the sliding platform of the ground rail platform.

[0010] Optionally, the lower support plate fixing support 6 is provided with a waist-shaped hole, so that the lower support plate fixing support 6 can move longitudinally on the test bench base plate 7.

[0011] Optionally, the lower support plate fixing bracket 6 has an elongated hole, which allows the lower support plate 5 to be adjusted up and down.

[0012] Optionally, the load transmission direction is as follows: the actuator transmits the test load to the horizontal tail servo and horizontal tail connection joint test piece through the servo load loading joint assembly 3, and then through the upper support plate 2 through the connecting bolts to the left connecting support 1 and the right connecting support 4 of the upper support plate, and through the lower support plate 5 through the connecting bolts to the lower support plate fixed support 6, and finally through the left connecting support 1, the right connecting support 4 and the lower support plate fixed support 6 to the test bench base plate 7 respectively, and the reaction force at the tail of the actuator is transmitted to the ground rail platform through the actuator fixed support 8.

[0013] A second aspect of the present invention provides a test method for using a load transmission device for a horizontal stabilizer servo and a horizontal stabilizer connection joint as described in any one of the first aspects, comprising: 1) Obtain the theoretical value of the load required to achieve the target load; 2) Configure the channel parameters for the servo motor's simulated load F based on theoretical values; 3) Perform load debugging to ensure that the actuator output F actually follows the input command F. Adjust the PID parameters to control the error between the two within 3%. 4) Adjust the test loading angle according to the load waveform. Angle, so that the loading actuator forms an angle with the horizontal plane of the test piece. The angle was adjusted further to ensure the loading accuracy met the requirement that the test load be less than 2.5%. 5) Attach strain gauges to the upper support plate 2 and the lower support plate 3 to monitor the load magnitude and force distribution. Adjust the installation position of the upper and lower support plates so that the load they bear is similar to the actual load. 6) Set the test load error limit and the loading device displacement limit, start the test and ensure that the test load and loading angle meet the test requirements.

[0014] This invention provides a load transmission device and test method for the horizontal stabilizer servo and horizontal stabilizer connection joint. During testing, this invention accurately simulates the installation and stress conditions of the horizontal stabilizer servo and horizontal stabilizer connection joint on the helicopter horizontal stabilizer. The test bench is stable, the test environment is good, and the load fluctuation is small. By using the device of this invention, the total test error can be controlled within 3%. Life analysis using the test data obtained by this invention can fully verify its performance and obtain the fatigue life of the structure. This invention also proposes a fatigue test method for the horizontal stabilizer servo and horizontal stabilizer connection joint, used for fatigue testing of the helicopter horizontal stabilizer servo and horizontal stabilizer connection joint. This method accurately applies the load to the horizontal stabilizer servo and horizontal stabilizer connection joint, realistically simulating the load and force transmission state of the helicopter horizontal stabilizer servo and horizontal stabilizer connection joint, overcoming the shortcomings of the prior art. Furthermore, this method improves the loading accuracy of the test load, ensuring accurate load application and force transmission between the horizontal stabilizer servo and the horizontal stabilizer connection joint. It fully verifies the fatigue performance of the horizontal stabilizer servo and the connection joint, while effectively overcoming the problems of low loading accuracy, large errors, and inadequate assessment of key parts of the test component leading to a conservative product safety life and failure to fully utilize the product's structural performance, which are problems associated with traditional methods. It solves the problem of realistically simulating the application of loads to helicopter horizontal stabilizer servo motors. The test load actuator generates the load, realizing the application of loads and force transmission between the horizontal stabilizer servo and the horizontal stabilizer connection joint. The test method ensures accurate load application and force transmission between the horizontal stabilizer servo and the horizontal stabilizer connection joint, realistically simulating the connection assembly and load transfer relationship between the horizontal stabilizer servo and the helicopter horizontal stabilizer. The test bench is stable, the test environment is good, the load fluctuation is small, and the test error can be controlled within 3%. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. The drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the installation of the test components; Figure 3 This is a diagram illustrating the adjustment of the loading angle. Figure 4 This is a schematic diagram of the force transmission path of the test load; Figure 5 This is a schematic diagram of the servo motor load loading connector assembly structure; Figure 6 A schematic diagram showing the connection between the servo load loading connector assembly and the horizontal stabilizer servo and horizontal stabilizer connection connector test piece via a double-ear and triple-ear structure. Figure 7 This is a schematic diagram of the ground rail platform; Figure 8 This is a top view of the experimental setup; Figure 9 A schematic diagram of the assembly of the lower support plate and the lower support plate fixed support; Explanation of reference numerals in the attached figures: 1- Connecting support on the left side of the upper support plate; 2-Upper support plate; 3-Servo load loading connector assembly; 4- Connecting support on the right side of the upper support plate; 5-Lower support plate; 6-Lower support plate fixed support; 7-Test bench base plate; 8-Actuator mounting bracket; 9-Horizontal tail servo connecting bolts; 10-Ground rail platform; 11-Loading actuator; 12 - Test specimen; 13-Rivet. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] The features and illustrative embodiments of various aspects of the present invention will now be described in detail. Numerous specific details are set forth in the following detailed description to provide a thorough understanding of the invention. However, it will be apparent to those skilled in the art that the invention may be practiced without requiring some of these specific details. The following description of embodiments is merely intended to provide a better understanding of the invention by illustrating examples of the invention. The invention is by no means limited to any specific setups and methods set forth below, but covers any improvements, substitutions, and modifications to structures, methods, and devices without departing from the spirit of the invention. Well-known structures and techniques are not shown in the drawings and the following description to avoid unnecessarily obscuring the invention.

[0019] In the description of this invention, it should be noted that the directions or positional relationships indicated by terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing and simplifying the invention, and should not be construed as limiting the invention. Furthermore, the use of ordinal numbers (e.g., "first and second," etc.) is for distinguishing objects and is not limited to this order, and should not be construed as indicating or implying relative importance.

[0020] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly, encompassing both direct connection and indirect connection via an intermediate medium. Those skilled in the art can understand the specific meaning of these terms in this invention based on the specific circumstances.

[0021] It should be noted that, unless otherwise specified, the embodiments of the present invention and the features thereof can be combined with each other, and the various embodiments can be referenced and cited in each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0022] The present invention will be further described in detail below with reference to the embodiments and accompanying drawings, but the embodiments of the present invention are not limited thereto.

[0023] Specifically, such as Figure 1-9As shown, the present invention provides a load transmission device for the horizontal tail servo and the horizontal tail connecting joint, including: a left connecting support 1 of the upper support plate, an upper support plate 2, a servo load loading joint assembly 3, a right connecting support 4 of the upper support plate, a lower support plate 5, a lower support plate fixing support 6, a test bench base plate 7, and an actuator fixing support 8.

[0024] The upper support plate 2, lower support plate 5, and horizontal stabilizer servo and horizontal stabilizer connection joint test piece 12 are riveted together by rivets 13, simulating the helicopter horizontal stabilizer structure interface design consistent with the installed state. Other parts are designed according to the strength requirements of the test bench, without considering factors such as horizontal stabilizer control function and aerodynamic shape. The test load is applied by the oblique loading actuator 11 at an angle to the horizontal plane of the test piece 12. Angle application is applied, and the load is transferred to the test piece through the servo load loading joint assembly 3 and the horizontal tail servo connecting bolt 9. Then, through the upper support plate 2 and the lower support plate 5, the load is transferred to the left connecting support 1 of the upper support plate, the right connecting support 4 of the upper support plate, and the fixed support 6 of the lower support plate, which truly simulates the connection and assembly relationship between the horizontal tail servo and the horizontal tail connecting joint and the horizontal tail and fuselage tail structure and the load transfer relationship.

[0025] This device can perform fatigue testing on the horizontal stabilizer servo and horizontal stabilizer connection joint of a helicopter, and simulate the connection and load transmission between the servo and the horizontal stabilizer. The test device can be divided into two parts: the test piece installation boundary simulation design and the load transmission design. 1. Test piece installation boundary simulation design: Simulate the actual installation state of the horizontal stabilizer servo and horizontal stabilizer connection joint. The upper support plate 2, lower support plate 5, and the horizontal stabilizer upper joint test piece are riveted and assembled into a test piece assembly, and the assembly is fixed to the left connecting support 1 of the upper support plate, the right connecting support 4 of the upper support plate, and the fixed support 6 of the lower support plate with bolts; 2. Load transmission design. The actuator transmits the test load to the test piece assembly through the servo load loading joint assembly 3, and then through the upper support plate 2 to the left connecting support 1 and the right connecting support 4 of the upper support plate via connecting bolts. The load is then transmitted from the lower support plate 5 to the lower support plate fixed support 6 via connecting bolts. Finally, the load is transmitted from the left connecting support 1, the right connecting support 4, and the lower support plate fixed support 6 to the test bench base plate 7 and the actuator fixed support 8, respectively.

[0026] The device of this invention can accurately simulate the boundary conditions of the test piece. The test bench is stable, the test environment is good, the load fluctuation is small, and the total test error can be controlled within 3%. The obtained test data can be used for life analysis to fully verify its performance and obtain the fatigue life of the structure.

[0027] like Figures 1-4As shown, this invention is a load transmission device for the horizontal stabilizer servo motor and the horizontal stabilizer connection joint. The interface design of the servo motor load loading joint assembly 3, the upper support plate 2, and the lower support plate 5 with the test piece is consistent with the installed state. Other parts are designed according to the strength of the test bench and the load transmission requirements, without considering the horizontal stabilizer's control function and aerodynamic shape. The test load is generated by the loading actuator 11 and the horizontal plane of the test piece. Angle application is applied, and the load is transferred through the servo load loading joint assembly 3, upper support plate 2 and lower support plate 5 to the horizontal tail servo and horizontal tail connection joint test piece, which truly simulates the connection assembly and load transfer relationship between the horizontal tail servo and the horizontal tail connection joint and the horizontal tail.

[0028] This test setup can be divided into two parts: the simulation design of the test piece mounting boundary and the load transmission design.

[0029] 1. Simulation Design of Test Component Installation Boundaries. Simulate the actual installation state of the horizontal stabilizer servo and the horizontal stabilizer connection joint. Rivet and assemble the upper support plate 2, lower support plate 5, and the horizontal stabilizer connection joint test component into a test assembly, such as... Figure 2 As shown; and the test assembly is fixed to the left side connecting support 1 of the upper support plate, the right side connecting support 4 of the upper support plate, and the lower support plate fixing support 6 by bolts. The test assembly can move laterally on the left and right supports 1 and 4 (e.g., Figure 3 (As shown in the X direction), the actuator fixed support 8 can move up and down on the ground rail platform 10 (e.g., Figure 3 As shown in the Z direction), the lower support plate fixing bracket 6 also needs to move longitudinally on the test bench base plate 7 (as shown in the Z direction). Figure 3 The Y-direction shown (i.e., the direction indicated by the dotted circle and the crossed circle in the diagram) is used to continuously adjust the loading angle of the actuator. And ensure it meets the test requirements, with the loading angle error not exceeding 1 degree, such as Figure 3 As shown.

[0030] 2. Load Transmission Design. The actuator transmits the test load to the test assembly via the servo motor load loading joint assembly 3. Then, the load is transmitted from the upper support plate 2 to the left connecting support 1 and the right connecting support 4 via connecting bolts. From the lower support plate 5, the load is transmitted to the lower support plate fixed support 6 via connecting bolts. Finally, the load is transmitted from the left connecting support 1, the right connecting support 4, and the lower support plate fixed support 6 to the test bench base plate 7. The reaction force from the actuator tail is transmitted to the wall-mounted ground rail platform via the actuator fixed support 8. The test scheme is reasonably designed, and the load transmission is accurate, ensuring smooth test execution and fully assessing the fatigue performance and structural weaknesses of the flat-tail connecting joint test piece. The load transmission route diagram is as follows: Figure 4 As shown.

[0031] During testing, this invention can accurately simulate the boundary conditions of the test piece, with a stable test bench, a good test environment, and small load fluctuations. By using the device of this invention for testing, the total test error can be controlled within 3%. The test data obtained by using the device of this invention for life analysis can fully verify its performance and obtain the fatigue life of the structure.

[0032] The present invention also provides a test method for using a load transmission device for a horizontal stabilizer servo and a horizontal stabilizer connection joint, comprising: (1) Based on the experimental loading scheme, establish a mechanical model and calculate the theoretical value of the load required to achieve the target load; (2) Configure the channel parameters for the servo motor simulated load F; (3) Perform load debugging so that the actuator output F actually follows the input command F. Adjust the PID parameters to control the error between the two within 3%.

[0033] (4) Adjust the test loading angle according to the load waveform. Degree (i.e., the angle between the loading actuator and the horizontal plane of the test piece) (Angle), further adjust the loading accuracy to meet the requirement that the test load is less than 2.5%.

[0034] (5) Attach strain gauges to the upper support plate 2 and the lower support plate 3 to monitor the load magnitude and force distribution. Adjust the installation position of the upper and lower support plates so that the load they bear is similar to the actual load.

[0035] (6) Set the test load error limit and the loading device displacement limit, start the test and ensure that the test load and loading angle meet the test requirements.

[0036] The above detailed embodiments are a description of the present invention. It should not be considered that the specific embodiments of the present invention are limited to these descriptions. For those skilled in the art, several simple deductions and substitutions can be made without departing from the concept of the present invention, and all of these should be considered to fall within the protection scope of the present invention.

Claims

1. A load transmission device for the connection joint between a horizontal stabilizer servo and a horizontal stabilizer, characterized in that, include: Upper support plate left side connecting support (1), upper support plate (2), servo motor load loading joint assembly (3), upper support plate right side connecting support (4), lower support plate (5), lower support plate fixed support (6), test bench base plate (7), actuator fixed support (8). The left side connecting support (1) and the right side connecting support (4) of the upper support plate are inverted L-shaped structures, which are set opposite each other on the bottom plate (7) of the test bench to form a portal frame structure with a break in the middle. The upper support plate (2) is connected between the left connecting support (1) and the right connecting support (4) of the upper support plate, and the lower support plate fixing support (6) is set on the bottom plate (7) of the test bench and located below the upper support plate (2); The test piece of the horizontal tail servo and the horizontal tail connection joint is set on the upper support plate (2), and the tail passes through the through hole on the upper support plate (2) and is connected to the lower support plate fixed support (6) through the lower support plate (5); The ground rail platform is vertically set on the side of the test bench base plate (7), and the actuator fixing support (8) is set on the ground rail platform. One end of the actuator is connected to the actuator fixing support (8), and the other end is connected to the horizontal tail servo and horizontal tail connection joint test piece through the servo load loading joint assembly (3). The actuator and the horizontal stabilizer servo are connected to the horizontal stabilizer at a predetermined angle to the horizontal plane of the test piece.

2. The load transmission device for the horizontal stabilizer servo and horizontal stabilizer connection joint according to claim 1, characterized in that, The upper support plate (2), the lower support plate (5) and the test piece of the horizontal tail servo and horizontal tail connection joint are connected by rivets.

3. The load transmission device for the horizontal stabilizer servo and horizontal stabilizer connection joint according to claim 1, characterized in that, The servo load loading connector assembly (3) and the horizontal tail servo and horizontal tail connection connector test piece are connected by a double-ear and a triple-ear structure, with a horizontal tail servo connection bolt (9) passing through the middle.

4. The load transmission device for the horizontal stabilizer servo and horizontal stabilizer connection joint according to claim 2, characterized in that, The upper support plate (2) is provided with an elongated hole, which can move laterally relative to the left side connecting support (1) and the right side connecting support (4) of the upper support plate, thereby driving the horizontal tail servo motor and the horizontal tail connecting joint test piece to move laterally.

5. The load transmission device for the horizontal stabilizer servo and horizontal stabilizer connection joint according to claim 1, characterized in that, The ground track platform is a wall-mounted sliding platform perpendicular to the ground, and the actuator fixed support (8) can move up and down along the sliding platform of the ground track platform.

6. The load transmission device for the horizontal stabilizer servo and horizontal stabilizer connection joint according to claim 2, characterized in that, The lower support plate fixing support (6) is provided with a waist-shaped hole, so that the lower support plate fixing support (6) can move longitudinally on the test bench base plate (7).

7. The load transmission device for the horizontal stabilizer servo and horizontal stabilizer connection joint according to claim 2, characterized in that, The lower support plate fixing bracket (6) has an elongated hole, which allows the lower support plate (5) to be adjusted up and down.

8. The load transmission device for the horizontal stabilizer servo and horizontal stabilizer connection joint according to claim 2, characterized in that, The load transmission direction is as follows: the actuator transmits the test load to the horizontal tail servo and horizontal tail connection joint test piece through the servo load loading joint assembly (3), and then through the upper support plate (2) to the upper support plate left connecting support (1) and the upper support plate right connecting support (4) through the connecting bolts. The load is transmitted from the lower support plate (5) to the lower support plate fixed support (6) through the connecting bolts. Finally, the load is transmitted from the upper support plate left connecting support (1), the upper support plate right connecting support (4) and the lower support plate fixed support (6) to the test bench base plate (7) respectively. The reaction force of the actuator tail is transmitted to the ground rail platform through the actuator fixed support (8).

9. A test method for using the load transmission device of the horizontal stabilizer servo and horizontal stabilizer connection joint as described in any one of claims 1-8, characterized in that, include: 1) Obtain the theoretical value of the load required to achieve the target load; 2) Configure the channel parameters for the servo motor's simulated load F based on theoretical values; 3) Perform load debugging to ensure that the actuator output F actually follows the input command F. Adjust the PID parameters to control the error between the two within 3%. 4) Adjust the test loading angle according to the load waveform. Angle, so that the loading actuator forms an angle with the horizontal plane of the test piece. The angle was adjusted further to ensure the loading accuracy met the requirement that the test load be less than 2.5%. 5) Attach strain gauges to the upper support plate (2) and the lower support plate (5) to monitor the load size and force distribution. Adjust the installation position of the upper and lower support plates so that the load they bear is similar to the actual load. 6) Set the test load error limit and the loading device displacement limit, start the test and ensure that the test load and loading angle meet the test requirements.

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