A nozzle aerodynamic load simulation device based on a cantilever beam load rod

Abstract

The application provides a passive loading device for controlling analog aerodynamic load of system simulation. By changing a loading mode of a nozzle aerodynamic load and adopting an external passive loading mode, the loading device can effectively reduce a floor space of the nozzle loading device, can simulate the aerodynamic load of the aircraft nozzle in different flight environments by changing the length of the load rod, can flexibly adjust the loading gradient, and can solve the problem of the redundant force generated by the active loading mode.

Description

Technical Field

[0001] This application relates to the field of aircraft control technology, specifically to a nozzle aerodynamic load simulation device based on a cantilever beam load bar. Background Technology

[0002] In addition to the propulsion that enables flight, aircraft in the atmosphere are also subject to aerodynamic and inertial forces. These aerodynamic forces vary with altitude, speed, and airflow. Therefore, aircraft must be able to withstand these forces. The most effective way to design a high-load-bearing, lightweight, and structurally sound aircraft is to monitor its stress and deformation during flight, providing a basis for design. Simulating the aerodynamic loads experienced by an aircraft on the ground is a crucial issue. A common method for applying aerodynamic loads to wing surfaces involves adding small sandbags or similar mass blocks to the outer surface. However, this method, using small sandbags, requires adding them one by one, resulting in long loading times, unstable loads, uneven load distribution across frames, and poor alignment of the aerodynamic load direction with actual conditions. Furthermore, the impact of the sandbags on the wing surface is difficult to control manually. Another method involves attaching a loading fabric to the outer surface of the wing, connecting it with levers, and then applying the load through a coordinated loading system. This loading method requires a large number of loading curtains, and places high demands on the curtain pasting process and lever arrangement. The curtain pasting is a dot matrix to simulate aerodynamic loads, which results in high costs. Summary of the Invention

[0003] To address the problems existing in the prior art, this application proposes a passive loading device for simulating aerodynamic loads in control system simulation. By changing the loading method of the nozzle aerodynamic load and adopting an external passive loading method with the load bar arranged vertically to the ground, the space occupied by the nozzle loading device can be effectively reduced. By changing the length of the load bar to simulate the aerodynamic loads of the aircraft nozzle in different flight environments, the loading gradient can be flexibly adjusted, while solving the problem of redundant force generated by active loading methods. The technical solution adopted in this application is as follows:

[0004] A nozzle aerodynamic load simulation device based on a cantilever beam load bar, the device comprising three parts: load bar, fixed base, and swing guide connector;

[0005] The load bar is perpendicular to the ground and parallel to the axial centerline of the nozzle;

[0006] One end of the load bar is fixed with a fixed base, and the other end is connected to the nozzle through a swing guide connector so that it can swing with the nozzle and be installed around the nozzle.

[0007] Furthermore, the load bar deforms during nozzle oscillation, thereby generating a loading torque to simulate the aerodynamic loads experienced by the nozzle at different oscillation angles during flight.

[0008] Furthermore, after the load bar is installed around the nozzle, the loading gradient of the load bar is a fixed value, and the magnitude of the loading torque is linearly related to the swing angle.

[0009] Furthermore, the loading gradient of the load bar is related to three variables: its number, diameter, and the distance between the swing guide connector and the fixed base. The loading gradient of the load bar can be changed by changing one or more of the above three variables.

[0010] Furthermore, the fixed base includes two parts: a fixed base and a clamping adjustment component, and has a clamping component position adjustment function.

[0011] Furthermore, the fixing base is fixedly connected to the ground, providing an installation end for the clamping adjustment component and the load bar.

[0012] Furthermore, by adjusting the height of the clamping adjustment component from the ground, the length of the load bar between the fixed base and the swing guide connector can be changed, thereby altering the loading gradient.

[0013] Furthermore, the swing guide connector includes three parts: a loading connector, multiple auxiliary rollers, and multiple roller mounting seats. The swing guide connector is used to keep the load bar swinging with the position of the nozzle.

[0014] Furthermore, the loading connector is connected to the nozzle to transmit the loading torque, the auxiliary rollers are mounted on the roller mounting base, and the load bar is clamped between multiple auxiliary rollers.

[0015] Furthermore, during nozzle oscillation, a small-distance displacement friction is generated between the load bar and the oscillation guide connector. The displacement friction is converted into rolling friction by the auxiliary roller, thereby reducing the frictional loss of the load bar.

[0016] The following technical effects can be achieved through the embodiments of this application: Compared with the prior art, the mechanical passive loading method based on load bar of this application can effectively eliminate redundant force and improve loading accuracy; it is easy to adjust the loading gradient of the aerodynamic load and realize the simulation of aerodynamic load under various working conditions; the pure mechanical loading device has higher reliability, is less prone to failure, and has low maintenance cost; the vertical installation method occupies a small area, saves site resources, and reduces usage costs. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the composition and structure of the aerodynamic load simulation device;

[0019] Figure 2 This is a schematic diagram of the components of the fixed base;

[0020] Figure 3 This is a diagram showing the components of the swing guide connector.

[0021] Figure label:

[0022] 1. Fixed base, 2. Load bar, 3. Swing guide connector, 4. Nozzle (loaded object), 5. Clamping adjustment component, 6. Loading connector, 7. Auxiliary roller, 8. Roller mounting base, 9. Fixed base. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0024] Figure 1This is a schematic diagram of the aerodynamic load simulation device. The device consists of a load bar, a fixed base, and a swing guide connector, with the nozzle being the object of load application. The load bar is perpendicular to the ground and parallel to the axial centerline of the nozzle. One end of the load bar is fixed to the fixed base, and the other end is connected to the nozzle via the swing guide connector, allowing it to swing with the nozzle. The load bar is installed around the nozzle. When the nozzle swings, the load bar deforms, generating a loading torque to simulate the aerodynamic loads experienced by the nozzle at different swing angles during flight. After the load bar is installed around the nozzle, its loading gradient is a fixed value, and the magnitude of the loading torque is linearly related to the swing angle. The loading gradient of the load bar is related to three variables: its quantity, diameter, and the distance between the swing guide connector and the fixed base. Changing one or more of these three variables alters the loading gradient. As shown in the diagram, one end of the load bar is fixed to the ground of the test site via the fixed base, while the other end can swing freely. The fixed end of the load bar forms a cantilever beam structure; when the freely swinging end is moved, it generates a bending moment, which is the loading torque.

[0025] Figure 2 This is a schematic diagram of the structure of the fixed base. The fixed base includes two parts: a fixed seat and a clamping adjustment component, which has a clamping component position adjustment function. The fixed seat is fixedly connected to the ground, providing an installation end for the clamping adjustment component and the load bar. By adjusting the height of the clamping adjustment component from the ground, the length of the load bar between the fixed base and the swing guide connector is changed, thereby changing the loading gradient.

[0026] Figure 3 The diagram shows the components of the swing guide connector, which includes a loading connector, multiple auxiliary rollers, and multiple roller mounting seats. The swing guide connector is used to keep the load bar swinging with the position of the nozzle. The loading connector connects to the nozzle and is used to transmit the loading torque. The auxiliary rollers are mounted on the roller mounting seats, and the load bar is held between the multiple auxiliary rollers, as shown in the figure, there are three auxiliary rollers. When the nozzle swings, a small displacement friction (sliding friction) is generated between the load bar and the swing guide connector. The auxiliary rollers convert the displacement friction into rolling friction to reduce the friction loss of the load bar. The gap distance between the multiple auxiliary rollers is adjusted to ensure the loading accuracy of the load bar during swinging and to reduce the friction loss of the load bar.

[0027] In summary, this application changes the way the nozzle aerodynamic load is applied, adopting an external passive loading method with the load bar arranged vertically to the ground. This can effectively reduce the space occupied by the nozzle loading device. By changing the length of the load bar to simulate the aerodynamic load of the aircraft nozzle in different flight environments, the loading gradient can be flexibly adjusted, while solving the problem of redundant force generated by the active loading method.

[0028] The specific embodiments described above do not constitute a limitation on the scope of protection of this disclosure. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this disclosure should be included within the scope of protection of this disclosure.

Claims

1. A nozzle aerodynamic load simulation device based on a cantilever beam load bar, characterized in that, The device consists of three parts: a load bar, a fixed base, and a swing guide connector. The load bar is perpendicular to the ground and parallel to the axial centerline of the nozzle; One end of the load bar is fixed with a fixed base, and the other end is connected to the nozzle through a swing guide connector so that it can swing with the nozzle and be installed around the nozzle. The swing guide connector comprises three parts: a loading connector, multiple auxiliary rollers, and multiple roller mounting seats. One end of the loading connector is connected to the nozzle, and the other end supports the roller mounting seats. The auxiliary rollers are correspondingly mounted on the roller mounting seats, and the multiple auxiliary rollers are evenly arranged circumferentially, with the load bar clamped between the multiple auxiliary rollers. The swing guide connector is used to keep the load bar swinging with the position of the nozzle. When the nozzle swings, a small displacement friction is generated between the load bar and the swing guide connector. The auxiliary rollers convert the displacement friction into rolling friction to reduce the frictional loss of the load bar.

2. The apparatus according to claim 1, characterized in that, When the nozzle swings, the load bar deforms, thereby generating a loading torque, simulating the aerodynamic loads experienced by the nozzle at different swing angles during flight.

3. The apparatus according to claim 2, characterized in that, After the load bar is installed around the nozzle, the loading gradient of the load bar is a fixed value, and the magnitude of the loading torque is linearly related to the swing angle.

4. The apparatus according to claim 1 or 3, characterized in that, The loading gradient of the load bar is related to three variables: its number, diameter, and distance between the swing guide connector and the fixed base. The loading gradient of the load bar can be changed by changing one or more of the above three variables.

5. The apparatus according to claim 1, characterized in that, The fixed base includes two parts: a fixed base and a clamping adjustment component, and has a clamping component position adjustment function.

6. The apparatus according to claim 5, characterized in that, The fixed base is fixedly connected to the ground, providing an installation end for clamping and adjusting components and load bars.

7. The apparatus according to claim 6, characterized in that, By adjusting the height of the clamping adjustment component from the ground, the length of the load bar between the fixed base and the swing guide connector is changed, thereby altering the loading gradient.

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