Elastic supporting device of slender body model and use method of elastic supporting device

Abstract

The invention provides an elastic supporting device for a slender body model and a using method thereof.The elastic supporting device comprises an elastic body, a supporting shaft and a rigid supporting rod, the rigid supporting rod is of a cantilever beam structure with one end fixed, two through holes distributed front and back are formed in the rigid supporting rod, and the two through holes correspond to modal nodes of the slender body model; the supporting shaft is inserted into and rotationally connected with the through hole, the elastic body is fixed to the through hole of the rigid supporting rod, and the elastic body is fixedly connected with the end of the supporting shaft. Load of the supporting device is mainly shared by the rigid supporting rod and the bearing, and deformation of the elastic body due to excessive stress is avoided. A slender body model is fixed at a modal node, so that an actual free boundary condition is effectively simulated, and a modal shape is highly consistent with a flight state. The supporting rigidity can be flexibly adjusted by adjusting the size parameters of the elastic body spring piece, and the dynamic characteristic requirements of different slender body models are met.

Description

Technical Field

[0001] The present invention relates to the field of aerospace technology, and in particular to an elastic supporting device for a slender body model and a use method thereof. Background Art

[0002] Slender structures have important application value in aerospace, wind tunnel testing and modal analysis. Accurate simulation of their mechanical properties and vibration behavior is one of the keys to ensure the reliability of research results. The dynamic characteristics of slender structures have an important impact on the aerodynamic performance, stability and safety of aircraft. Slender body models are usually used in ground tests to study aerodynamic performance and structural dynamic response, including parameters such as modal vibration shape, vibration frequency and dynamic stability.

[0003] Existing elastic support devices for slender models usually adopt leaf springs, which have the following defects: Limited load-bearing capacity: Leaf springs are easily deformed or damaged due to excessive model loads. Insufficient modal matching accuracy: The dynamic characteristics of the support structure deviate greatly from the actual boundary conditions, affecting the accuracy of the modal test. Complex installation and insufficient accuracy: The installation and adjustment of the leaf spring device is time-consuming and difficult to meet the diverse test requirements. Therefore, a new type of elastic support device is needed to meet the vibration modal and wind tunnel test requirements of slender models with higher reliability and accuracy. Summary of the invention

[0004] The object of the present invention is to provide an elastic support device for a slender body model and a method for using the same, so as to achieve high-precision matching of the model modal vibration shape through an elastic body and a multi-axis system.

[0005] According to one purpose of the present invention, the present invention provides an elastic support device for a slender body model, comprising an elastomer, a support shaft and a rigid support rod, wherein the rigid support rod is a cantilever beam structure fixed at one end, and the rigid support rod is provided with two through holes distributed front and back, the two through holes corresponding to the modal nodes of the slender body model, the support shaft is inserted into and rotatably connected to the through holes, the elastomer is fixed at the through holes of the rigid support rod, and the elastomer is fixedly connected to the end of the support shaft.

[0006] Furthermore, the elastic body is provided at each of the through holes.

[0007] Furthermore, the elastic body is provided on both sides of the through hole.

[0008] Furthermore, the elastomer has an n-shaped structure.

[0009] Furthermore, the elastic body includes spring sheets on both sides and a connecting portion connecting the two spring sheets, the two spring sheets are fixedly connected to the rigid support rods respectively, and the middle portion of the connecting portion is fixedly connected to the support shaft.

[0010] Furthermore, both ends of the support shaft are provided with splines, a keyway is provided in the middle of the connecting portion, and the splines are inserted into the keyway.

[0011] Furthermore, two ends of the support shaft are fixedly connected to the inner wall of the slender body model.

[0012] Furthermore, a bearing is provided in the through hole, the bearing is fixed in the through hole via a bearing fixing ring, and the support shaft passes through the bearing.

[0013] According to another object of the present invention, the present invention provides a method for using the elastic support device of the slender body model, comprising the following steps:

[0014] The two ends of the support shaft are fixed to the slender body model, and it is ensured that the model generates controlled elastic vibration on the support shaft;

[0015] The elastic body provides a controllable elastic support force for the slender body model; the front and rear nodes of the slender body model are connected to the rigid support rod through an elastic support device to form a boundary condition for free vibration;

[0016] When the supporting shaft rotates synchronously, the spring sheet of the elastic body deforms, producing an elastic response coordinated with the movement of the slender body model;

[0017] The dimensional parameters of the elastic body are matched with the modal characteristics of the test model to achieve high-precision dynamic simulation.

[0018] Furthermore, precise adjustment of the support stiffness can be achieved by optimizing the design of the length, thickness or material of the spring sheet of the elastic body.

[0019] The load of the support device of the technical solution of the present invention is mainly shared by the rigid support rod and the bearing, so as to avoid excessive stress and deformation of the elastic body. The slender body model is fixed at the modal node to effectively simulate the actual free boundary conditions, so that the modal vibration shape is highly consistent with the flight state. By adjusting the size parameters of the elastic body spring sheet, the support stiffness can be flexibly adjusted to adapt to the dynamic characteristics requirements of different slender body models. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 It is a structural schematic diagram of an embodiment of the present invention;

[0022] Figure 2 is another structural schematic diagram of an embodiment of the present invention;

[0023] Figure 3 It is a schematic diagram of the partial structure of the elastic body and the rigid support rod according to an embodiment of the present invention;

[0024] Figure 4 Schematic diagram of the internal structure of an embodiment of the present invention;

[0025] Figure 5 This is a schematic diagram of the structure of the elastic body of the embodiment of the present invention when it is not deformed;

[0026] Figure 6 It is a side view of the elastic body of the embodiment of the present invention when it is not deformed;

[0027] Figure 7 This is a schematic diagram of the structure of the elastic body when it is deformed according to an embodiment of the present invention;

[0028] Figure 8 It is a side view of the elastic body of the embodiment of the present invention when it is deformed;

[0029] In the figure: 1. Slender body model; 2. Elastic body; 3. Support shaft; 4. Bearing; 5. Bearing fixing ring; 6. Rigid support rod. DETAILED DESCRIPTION

[0030] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0032] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined. In addition, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] Example 1

[0034] like Figure 1-Figure 8 As shown,

[0035] An elastic support device for a slender body model comprises a slender body model 1, an elastic body 2 and a rigid support rod 6, wherein:

[0036] In this embodiment, the slender body model 1 is used as the test object, with a thin shell structure and front and rear modal nodes for fixing. The rigid support rod 6 provides rigid support for the overall structure and is fixed to the test platform in the form of a cantilever beam.

[0037] The rigid support rod 6 is a cantilever beam structure with one end fixed. A through hole is respectively provided at the front and rear of the rigid support rod 6. The two through holes on the rigid support rod 6 are used to correspond to the modal node positions of the slender body model 1. The support shaft 3 is rotatably connected in the through hole.

[0038] In this embodiment, the rigid support rod 6 is made of metal material with high strength and anti-deformation performance.

[0039] Elastic bodies 2 are provided at the through holes in front and behind the rigid support rod 6, and the elastic bodies 2 are arranged on both sides of the through holes. The elastic body 2 is an n-shaped structure, and the elastic body 2 includes spring sheets on both sides and a connecting portion for connecting the two spring sheets, the center of the connecting portion is fixedly connected to the support shaft, and the spring sheets on both sides of the elastic body 2 are respectively fixedly connected to the slender body model 1 by screws.

[0040] In this embodiment, the elastic body 2 is in an "n" shape, and the spring sheets on both sides provide elastic support force, and the stiffness can be adjusted by adjusting the size. The elastic body 2 is made of a high elastic modulus material to ensure its elastic recovery ability under multiple deformations.

[0041] The support shaft 3 passes through the through hole of the rigid support rod 6 and is rotatably connected to the through hole, and both ends of the rigid support rod 6 are respectively fixedly connected to the corresponding connecting parts of the elastic body 2. The support shaft 3 is rotatably connected to the through hole, and when the center of the elastic body 2 rotates through the support shaft 3, the spring sheets on both sides generate elastic force due to deformation, providing elastic support for the slender body model 1.

[0042] Both ends of the support shaft 3 are fixedly connected to the inner wall of the slender body model 1 by bolts.

[0043] Specifically, a bearing 4 is provided in the through hole of the rigid support rod 6, and the support shaft 3 passes through the bearing 4. The bearing 4 is fixedly mounted on the outside of the through hole by a bearing fixing ring 5, and the bearing fixing ring 5 is mounted outside the through hole by screws to limit the axial movement of the support shaft 3 and the bearing 4.

[0044] Splines are provided at both ends of the support shaft 3, and a keyway is provided in the middle of the connecting part of the elastic body 2. The splines at both ends of the support shaft 3 are inserted into the keyway of the elastic body 2 to ensure that the elastic body 2 and the support shaft 3 rotate synchronously.

[0045] In this embodiment, the support shaft 3 passes through the elastic body and the rigid support rod, connects the model and provides rotational freedom. The bearing 4 and the bearing fixing ring 5 are used to reduce friction and limit the axial movement of the support shaft.

[0046] The operation of the support device of the present invention depends on the linkage between the elastic body 2 and the support shaft 3: the tip of the support shaft 3 fixes the slender body model through bolts and ensures that the model can generate controlled elastic vibrations on the support shaft. The "n"-shaped design of the elastic body 2 provides a controllable elastic support force. When the support shaft rotates synchronously, the spring sheet deforms to produce an elastic response coordinated with the movement of the model. The dimensional parameters of the elastic body 2 match the modal characteristics of the test model to achieve high-precision dynamic simulation. The precise adjustment of the support stiffness is achieved through the design optimization of the spring sheet parameters (length, thickness and material).

[0047] In this embodiment, the fixation at the modal node ensures that the modal vibration shape of the model is not disturbed by the support structure. The front and rear nodes are connected to the rigid support rod through an elastic support device to form a boundary condition for free vibration. The splines at both ends of the support shaft are inserted into the central hole of the elastic body to ensure the synchronous movement of the support shaft and the elastic body.

[0048] In this embodiment, the support shaft adopts a multi-step axisymmetric design to adapt to different components and optimize the force distribution. The cooperation between the bearing and the bearing fixing ring ensures the low friction characteristics of the support shaft when rotating and limits the axial movement.

[0049] Compared with the traditional leaf spring solution, the outstanding advantages of the present invention are as follows:

[0050] High load-bearing capacity: The load is mainly shared by rigid support rods and bearings, and the elastomer is subjected to less force to avoid deformation and damage.

[0051] Accurate simulation of dynamic characteristics: Through modal node fixation and "n"-shaped elastic body design, the modal vibration shape of the test model is highly consistent with the actual flight state.

[0052] Strong adjustability: By replacing or adjusting the elastic body parameters, the support stiffness can be flexibly controlled to meet diverse test needs.

[0053] Efficient installation and high-precision assembly: The component structure design is simple and the assembly process is easy to implement, which can effectively reduce the test preparation time.

[0054] The fixation at the front and rear modal nodes of the present invention enables the test model to respond dynamically in a manner close to the free vibration boundary conditions, and the modal parameters are highly consistent with the actual flight state. The elastic support device of the slender body model based on the n-shaped elastic body of the present invention provides a reliable technical solution for high-precision modal tests and wind tunnel tests, and has broad application prospects and technical value.

[0055] The load of the support device of the present invention is mainly shared by the rigid support rod and the bearing, so as to avoid excessive stress and deformation of the elastic body. The slender body model is fixed at the modal node to effectively simulate the actual free boundary conditions, so that the modal vibration shape is highly consistent with the flight state. By adjusting the size parameters of the elastic body spring sheet, the support stiffness can be flexibly adjusted to adapt to the dynamic characteristics requirements of different slender body models.

[0056] The device of the present invention adopts modular design, has fast assembly and high precision, and improves test efficiency. The elastic support device of the present invention can be widely used in ground modal tests, aeroelastic tests and wind tunnel tests, and provides a high-precision experimental platform for aerospace structural dynamics research.

[0057] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An elastic support device for a slender body model, characterized in that: It includes an elastomer, a support shaft and a rigid support rod, wherein the rigid support rod is a cantilever beam structure fixed at one end, and the rigid support rod is provided with two through holes distributed front and back, the two through holes correspond to the modal nodes of the slender body model, the support shaft is inserted into and rotatably connected to the through holes, the elastomer is fixed at the through holes of the rigid support rod, and the elastomer is fixedly connected to the end of the support shaft.

2. The elastic support device for a slender body model according to claim 1, characterized in that: The elastic body is arranged at each through hole.

3. The elastic support device for a slender body model according to claim 2, characterized in that: The elastic body is disposed on both sides of the through hole.

4. The elastic support device for a slender body model according to claim 1, characterized in that: The elastic body has an n-shaped structure.

5. The elastic support device for a slender body model according to claim 1, characterized in that: The elastic body includes spring sheets on both sides and a connecting portion connecting the two spring sheets. The two spring sheets are fixedly connected to the rigid support rods respectively, and the middle portion of the connecting portion is fixedly connected to the support shaft.

6. The elastic support device for a slender body model according to claim 5, characterized in that: The supporting shaft has splines at both ends, and a keyway is provided in the middle of the connecting portion, and the splines are inserted into the keyway.

7. The elastic support device for a slender body model according to claim 1, characterized in that: Both ends of the support shaft are fixedly connected to the inner wall of the slender body model.

8. The elastic support device for a slender body model according to claim 1, characterized in that: A bearing is arranged in the through hole, and the bearing is fixed in the through hole through a bearing fixing ring, and the support shaft passes through the bearing.

9. The method for using the elastic support device for a slender body model according to claim 1, characterized in that: The steps include: The two ends of the support shaft are fixed to the slender body model, and it is ensured that the model generates controlled elastic vibration on the support shaft; The elastic body provides a controllable elastic support force for the slender body model; the front and rear nodes of the slender body model are connected to the rigid support rod through an elastic support device to form a boundary condition for free vibration; When the supporting shaft rotates synchronously, the spring sheet of the elastic body deforms, producing an elastic response coordinated with the movement of the slender body model; The dimensional parameters of the elastic body are matched with the modal characteristics of the test model to achieve high-precision dynamic simulation.

10. The method for using the elastic support device for a slender body model according to claim 9, characterized in that: The support stiffness can be precisely adjusted by optimizing the design of the length, thickness or material of the spring leaf of the elastic body.

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