Structural buckling, flutter and jump stability test device

Abstract

The invention provides a structure buckling, flutter and jump stability test device, and relates to the field of engineering equipment structure static / dynamic comprehensive tests. Comprising a basic test bench, a transmission mechanism and a support are fixedly arranged on the basic test bench, a test unit is arranged on the transmission mechanism, and the test unit is fixed through the support. The test unit comprises a multi-rod beam hinge mechanism (or other forms of connecting beam column structures), one end of the multi-rod beam hinge mechanism is movably connected with a friction roller, and the other end is hinged with a lever loading mechanism; and the friction roller is contacted with the transmission mechanism. According to the invention, through the relative movement generated between the multi-rod beam hinge mechanism (or other forms of connecting beam column structures) and the transmission mechanism, and through the lever loading mechanism, the normal load of the friction roller is regulated and controlled, and deep analysis can be carried out on buckling, fluttering and complex jumping behaviors in the movement process; the technical problem that a static / dynamic comprehensive test and simulation of a high-fidelity engineering equipment structure are difficult to realize in an existing experimental technology device is solved.

Description

Technical Field

[0001] This invention relates to the field of integrated static / dynamic testing of engineering equipment structures, and more specifically, to a testing device for structural buckling, flutter, and jump stability. Background Technology

[0002] Engineering equipment structures, such as lifting surfaces / control surfaces / skin panels of aircraft in the aerospace field, pipelines in the energy and chemical industry, drilling rod structures in the petroleum engineering field, wind turbine blades, and pantograph structures in the rail transportation field, are subjected to non-conservative environmental dynamics during service, exhibiting buckling, flutter, and complex jump behaviors. They display complex characteristics such as multi-steady-state, nonlinear, multi-scale, and non-Hermitian features. This makes it difficult for existing global dynamic behavior approximation analysis methods based on local modal information of a given potential well to accurately capture the complex dynamic behavior of these systems. Furthermore, because the non-conservative dynamic loads borne by these actual structures are difficult to accurately reproduce and simulate in experiments, existing theoretical analysis methods are difficult to verify through principle experiments. This has become a technical bottleneck restricting the accurate prediction and analysis of the static / dynamic behavior of these key engineering equipment structures. Summary of the Invention

[0003] The purpose of this invention is to provide a structural buckling, flutter, and jump stability testing device that can simulate the buckling, flutter, and complex jump behavior of engineering equipment under non-conservative forces, and perform corresponding static / dynamic analysis and verification. This solves the bottleneck technical problem that it is difficult to realize the non-conservative dynamics of in-service engineering equipment structures with high fidelity in existing experimental devices.

[0004] The embodiments of the present invention are implemented as follows: This invention provides a structural buckling, flutter, and jump stability testing device, including a basic test platform. A transmission mechanism and a support are fixedly mounted on the basic test platform. A test unit is mounted on the transmission mechanism and fixed by the support.

[0005] Furthermore, the aforementioned test unit includes a multi-beam hinge mechanism (or other form of beam-column connection structure), one end of which is movably connected to a friction roller, and the other end is hinged to a lever loading mechanism; the friction roller is in contact with the aforementioned transmission mechanism.

[0006] Furthermore, the aforementioned lever loading mechanism includes a main rod and two auxiliary rods, which are connected by bearings; one of the auxiliary rods is hinged to the multi-rod beam hinge mechanism (or other form of beam-column connection structure), and a weight is hung on the other auxiliary rod.

[0007] Furthermore, the aforementioned multi-bar beam hinge mechanism (or other form of beam-column connection structure) consists of two or more connecting rods, with any of the aforementioned connecting rods hinged together.

[0008] Furthermore, it also includes a terminal processing device, which is located on one side of the basic test bench; a signal sensor is provided on the connecting rod, and the signal sensor is wirelessly connected to the terminal processing device.

[0009] Furthermore, the aforementioned multi-beam hinge mechanism (or other form of beam-column connection structure) is also equipped with an active control drive device, which is wirelessly connected to the aforementioned terminal processing device.

[0010] Furthermore, the aforementioned transmission mechanism is equipped with a conveyor belt, the aforementioned friction roller is in contact with the aforementioned conveyor belt, and the roller body of the aforementioned friction roller is perpendicular to the movement direction of the aforementioned conveyor belt.

[0011] Furthermore, the aforementioned overall test apparatus is equipped with a basic excitation device.

[0012] Compared with the prior art, the embodiments of the present invention have at least the following advantages or beneficial effects: 1. This invention utilizes the relative motion generated between a multi-bar beam hinge mechanism (or other forms of beam-column connection structure) with friction rollers and a transmission mechanism, and uses a lever loading mechanism with weights to regulate the normal load on the friction rollers; the resulting frictional force simulates the non-conservative dynamic forces experienced by the structure of engineering equipment during service; and enables in-depth analysis of buckling, flutter, and complex jump behaviors exhibited during the motion process; 2. This invention can also apply specific spectral forced harmonic or noise excitation to the basic test bench, and in conjunction with signal sensors and terminal processing devices, perform static / dynamic analysis on multi-beam hinged mechanisms (or other forms of beam-column connection structures), thereby elucidating the static critical / post-buckling, dynamic flutter, and static / dynamic integrated cross-saddle jump behavior characteristics and mechanisms of the analyzed structure; 3. The present invention can also suppress the nonlinear static / dynamic behavior of the multi-beam hinge mechanism (or other form of beam-column connection structure) by setting an active control drive device in the multi-beam hinge mechanism (or other form of beam-column connection structure). Attached Figure Description

[0013] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is a perspective view of an embodiment of the present invention; Figure 2 This is a side view of an embodiment of the present invention; Figure 3 This is a schematic diagram of the connecting rod in an embodiment of the present invention; Icons: 1-Basic test bench; 2-Transmission mechanism; 3-Conveyor belt; 4-Friction roller; 5-Multi-bar beam hinge mechanism (or other form of beam-column connection structure); 501-Connecting rod; 6-Lever loading mechanism; 601-Weight; 7-Support; 8-Terminal processing device; 9-Signal sensor; 10-Active control drive device. Detailed Implementation

[0015] 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, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0016] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0017] Example Please refer to Figures 1-3 This embodiment provides a structural buckling, flutter and jump stability testing device, including a basic test bench 1, a transmission mechanism 2 and a support 7 fixedly mounted on the basic test bench 1, a test unit mounted on the transmission mechanism 2, and the test unit fixed by the support 7.

[0018] The test unit includes a multi-bar beam hinge mechanism (or other form of beam-column connection structure) 5 and a lever loading mechanism 6. The multi-bar beam hinge mechanism (or other form of beam-column connection structure) 5 is formed by two or more connecting rods 501 connected to each other, thereby simulating the multi-order buckling or vibration mode configuration of the beam structure. A friction roller 4 is provided at the end of the connecting rod 501 located at the tail end, and the rotation axis of the friction roller 4 coincides with the axis of the end of the connecting rod 501. In addition, the front end of the connecting rod 501 located at the head end is hinged to a secondary rod of the lever loading mechanism 6.

[0019] Furthermore, the lever loading mechanism 6 consists of a main rod and two auxiliary rods, which are connected by bearings. One of the auxiliary rods is hinged to the aforementioned multi-bar beam hinge mechanism (or other form of beam-column connection structure) 5, and a weight 601 is hung on the other auxiliary rod. In addition, a ring is provided on the main rod, and the top rod of the support 7 passes through the ring to fix the lever loading mechanism 6.

[0020] It should be noted that the configuration and mass distribution of each member can be designed according to the characteristics of the continuous structure it simulates. The hinge stiffness and connection damping characteristics of the hinge pair can also be configured according to specific requirements. The only thing that needs to be ensured is that the rotation axis of the friction roller 4 coincides with the axis of the end member of the connecting rod.

[0021] In addition, the transmission mechanism 2 is also equipped with a conveyor belt 3, and the friction roller 4 is in contact with the conveyor belt 3, with the roller body of the friction roller 4 perpendicular to the movement direction of the conveyor belt 3. During the operation of this experimental device, the transmission mechanism 2 is first started, and the conveyor belt 3 on the transmission mechanism 2 begins to move; since the roller body of the friction roller 4 is perpendicular to the movement direction of the conveyor belt 3, under the action of friction, the friction roller 4 will be pushed to move along the movement direction of the transmission belt. The friction roller 4 drives the connecting rod 501 to move, and then drives the relative displacement inside the entire multi-bar beam hinge mechanism (or other form of beam-column connection structure) 5; the axial friction force generated by the conveyor belt 3 and the friction roller 4 along the direction of the end member is used to simulate the non-conservative follow-force that always acts along the axial direction of the member, thereby constructing a non-conservative dynamic system.

[0022] Furthermore, in this embodiment, by adjusting the number of weights 601, the normal contact force between the friction roller 4 and the conveyor belt 3 can be controlled; and the speed of the conveyor belt 3 can be controlled by adjusting the conveying mechanism, thereby simulating the changes in the axial friction force generated by the friction roller 4 and the multi-bar beam hinge mechanism (or other forms of beam-column connection structure) 5 under different speeds and normal contact forces.

[0023] Furthermore, in this embodiment, a signal sensor 9 is provided on the connecting rod 501 of the multi-bar hinge mechanism (or other form of beam-column connection structure) 5. The signal sensor 9 is a speed sensor and a displacement sensor. A terminal processing device is also provided next to the foundation test bench 1. The signal sensor 9 and the terminal processing device are wirelessly connected (via Bluetooth or Wi-Fi). The terminal processing device receives the information emitted by the signal sensor 9 and combines it with the weight of the weight 601, the speed of the conveyor belt 3, and the weight of the friction roller 4. Through static / dynamic analysis, the buckling, flutter, and jump behaviors exhibited by the multi-bar hinge mechanism (or other form of beam-column connection structure) 5 during the movement can be analyzed and displayed, and these behavioral characteristics can be dynamically analyzed and verified.

[0024] Specifically, firstly, the buckling stability boundary conditions (corresponding to static critical axial friction force) of the multi-beam hinged mechanism (or other form of beam-column connection structure) 5 are analyzed based on the static Euler buckling stability theory; then, the flutter stability boundary conditions (corresponding to dynamic critical axial friction force) of the multi-beam hinged mechanism (or other form of beam-column connection structure) 5 are analyzed based on the dynamic Nikolai flutter stability theory; finally, by combining the static and dynamic critical axial friction forces, the multistable nonlinear static / dynamic behavior characteristics of the system after buckling or flutter instability in different parameter domains are determined, and corresponding parameters are set to conduct experimental analysis and verification studies in combination with the theoretical analysis results. The sensor signals of the test structure are also considered, and the corresponding actions of the active control system drive device are applied.

[0025] Furthermore, in this embodiment, an active control drive device 10 is provided on the connecting rod 501 of the multi-bar hinge mechanism (or other form of beam-column connection structure) 5. The active control drive device 10 is also connected to the terminal processing device via wireless signal. In actual use, the test personnel can control the start / stop, vibration frequency, vibration duration, and other parameters of the active control drive device 10 through the terminal processing device, thereby suppressing the nonlinear static / dynamic behavior of the multi-bar hinge mechanism (or other form of beam-column connection structure) 5.

[0026] Optionally, during the experiment, a basic excitation device can be added to apply a specific spectral forced harmonic or noise excitation to the basic test bench 1 to simulate the conservative external excitation that the engineering equipment structure is subjected to during service, and to carry out corresponding principle experiments of the conservative dynamic system.

[0027] Optionally, this device can also introduce corresponding functional materials or structures (such as piezoelectric, thermosensitive and photosensitive functional materials, or mechanical, acoustic and optical metamaterials / structures, etc.) according to experimental requirements, or adopt other specific structural forms to analyze the nonlinear static / dynamic behavior of other discrete mechanisms that generate nonconservative cyclic loads.

[0028] In summary, the embodiments of the present invention provide a structural buckling, flutter, and jump stability testing device. This device utilizes the relative motion generated between a multi-bar beam hinged mechanism (or other form of beam-column connection structure) 5 with friction rollers 4 and a transmission mechanism 2, and adjusts the normal load on the friction rollers 4 via a lever loading mechanism 6 with weights 601. The resulting frictional force simulates the non-conservative dynamic forces experienced by the engineering equipment structure during service. Furthermore, it enables in-depth analysis of buckling, flutter, and complex jump behaviors exhibited during the motion process. This invention applies a specific spectral forced harmonic or noise excitation to the basic test bench 1, and in conjunction with the signal sensor 9 and terminal processing device, performs static / dynamic analysis on the multi-beam hinge mechanism (or other forms of beam-column connection structure) 5, thereby elucidating the static critical / post-buckling, dynamic flutter, and static / dynamic integrated cross-saddle jump behavior characteristics and mechanisms of the analyzed structure; The present invention can also suppress the nonlinear static / dynamic behavior of the multi-beam hinge mechanism (or other form of beam-column connection structure) 5 by setting an active control drive device 10 in the multi-beam hinge mechanism (or other form of beam-column connection structure) 5.

[0029] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A structural buckling, flutter, and jump stability testing device, characterized in that, The system includes a basic test bench, on which a transmission mechanism and a support are fixedly mounted. A test unit is mounted on the transmission mechanism and the test unit is fixed by the support.

2. The structural buckling, flutter, and jump stability testing device according to claim 1, characterized in that, The test unit includes a multi-beam hinge mechanism (or other form of beam-column connection structure), one end of which is movably connected to a friction roller, and the other end is hinged to a lever loading mechanism; the friction roller is in contact with the transmission mechanism.

3. The structural buckling, flutter, and jump stability testing device according to claim 2, characterized in that, The lever loading mechanism includes a main rod and two auxiliary rods, which are connected by bearings; one of the auxiliary rods is hinged to the multi-rod beam hinge mechanism (or other form of beam-column connection structure), and a weight is hung on the other auxiliary rod.

4. The structural buckling, flutter, and jump stability testing device according to claim 3, characterized in that, The multi-bar beam hinge mechanism (or other form of beam-column connection structure) consists of two or more connecting rods, and any of the connecting rods are hinged together.

5. The structural buckling, flutter, and jump stability testing device according to claim 4, characterized in that, It also includes a terminal processing device, which is located on one side of the basic test bench; a signal sensor is provided on the connecting rod, and the signal sensor is wirelessly connected to the terminal processing device.

6. The structural buckling, flutter, and jump stability testing device according to claim 5, characterized in that, The multi-beam hinge mechanism (or other form of beam-column connection structure) is also equipped with an active control drive device, which is wirelessly connected to the terminal processing device.

7. The structural buckling, flutter, and jump stability testing device according to claim 2, characterized in that, The transmission mechanism is equipped with a conveyor belt, the friction roller is in contact with the conveyor belt, and the roller body of the friction roller is perpendicular to the movement direction of the conveyor belt.

8. The structural buckling, flutter, and jump stability testing device according to claim 2, characterized in that, The overall test device is equipped with a basic excitation device.

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