阅读说明：本技术 一种基于负泊松比结构的高速试验台减振底座 (High-speed test bed vibration reduction base based on negative Poisson ratio structure ) 是由 王权岱 彭书松 曹荣 杨新宇 于 2021-08-06 设计创作，主要内容包括：一种基于负泊松比结构的高速试验台减振底座,包括有底座面板、吸能腹板一、吸能腹板二、吸能腹板三、吸能腹板四、吸能腹板五、底座底板和底座底板；底座面板与底座底板和底座底板之间设有多个负泊松比单胞,多个负泊松比单胞组成一个底座块体,负泊松比单胞的结构呈内凹六边形；吸能腹板一、吸能腹板二、吸能腹板三、吸能腹板四和吸能腹板五由大量结构相同的负泊松比单胞结构阵列得到；本发明解决了转子系统不平衡力引起的振动对轴系部件损坏的问题,提高了检测平台的吸能抑振能力。(A high-speed test bed vibration damping base based on a negative Poisson ratio structure comprises a base panel, an energy-absorbing web I, an energy-absorbing web II, an energy-absorbing web III, an energy-absorbing web IV, an energy-absorbing web V, a base bottom plate and a base bottom plate; a plurality of negative Poisson ratio unit cells are arranged between the base panel and the base bottom plate and between the base panel and the base bottom plate, the negative Poisson ratio unit cells form a base block, and the structure of the negative Poisson ratio unit cells is in a concave hexagon shape; the energy absorption web I, the energy absorption web II, the energy absorption web III, the energy absorption web IV and the energy absorption web V are obtained by a large number of negative Poisson's ratio unit cell structure arrays with the same structure; the invention solves the problem that the shafting components are damaged by vibration caused by unbalanced force of a rotor system, and improves the energy absorption and vibration suppression capability of the detection platform.)

1. A high-speed test bed vibration damping base based on a negative Poisson ratio structure is characterized by comprising a base panel (1), an energy-absorbing web I (2), an energy-absorbing web II (3), an energy-absorbing web III (4), an energy-absorbing web IV (5), an energy-absorbing web V (6), a base bottom plate (7) and a base bottom plate (8); a plurality of negative Poisson ratio unit cells are arranged between the base panel (1) and the base bottom plate (7) and the base bottom plate (8), the negative Poisson ratio unit cells form a base block, and the structure of the negative Poisson ratio unit cells is concave hexagon.

2. The high-speed test bed vibration attenuation base based on the negative Poisson ratio structure is characterized in that a large number of negative Poisson ratio unit cell structures with the same structure are arrayed in a plane to form the energy absorption web plate I (2), the energy absorption web plate II (3), the energy absorption web plate III (4), the energy absorption web plate IV (5) and the energy absorption web plate V (6).

3. The vibration damping base of the high-speed test bed based on the negative Poisson ratio structure is characterized in that a boss is arranged at the bottom of the base block body, and the base bottom plate (7) and the base bottom plate (8) are abutted against the side edge of the boss to realize positioning.

4. The vibration damping base of the high-speed test bed based on the negative Poisson ratio structure as claimed in claim 1, wherein the concave hexagon: the length B of the two bottom edges is 75mm, the vertical distance H of the two bottom edges is 77mm, and the included angle theta between the bottom edges and the adjacent bevel edge is 64.5 degrees; the wall thickness of the negative poisson ratio structure unit cell is t 12 mm.

Technical Field

The invention belongs to the field of vibration reduction equipment, and relates to a vibration reduction base which is used in a new energy automobile high-speed test bed and other operation environments affected by vibration, in particular to a vibration reduction base suitable for a rotor dynamic unbalance environment.

Background

At present, the problems of energy and environment are increasingly serious, the vigorous development of energy-saving and new energy automobiles is an effective way for solving the problems of energy and environment, and meanwhile, the new energy automobile industry is a strategic emerging industry and plays an important role in the development of national economy and society. Under the advocation and support of national policies, the new energy automobile market rapidly increases.

The development trend of high speed of a new energy automobile electric drive system enables the problem of shafting vibration to be more prominent. The causes of vibration are many, with "unbalanced forces" being the main cause, and it is statistical that 70% of vibration failures of rotating machines result from rotor system imbalances.

The unbalanced forces of the rotor system are transmitted to the carrier via the bearings, and the carrier is thus subjected to simple harmonic forces. The reaction force of the support to the shafting or the possible resonance of the support under the action of simple harmonic force can further intensify the vibration of the shafting. The base of the system is therefore required to have good damping properties to avoid damage to the shafting components from vibration caused by unbalanced forces.

Disclosure of Invention

In order to overcome the defects of the prior art, the invention aims to provide the vibration damping base of the high-speed test bed based on the negative Poisson's ratio structure, and the vibration damping base has the characteristics of good vibration damping performance and small quality.

In order to achieve the purpose, the invention adopts the technical scheme that: a high-speed test bed vibration damping base based on a negative Poisson ratio structure is characterized by comprising a base panel, an energy-absorbing web I, an energy-absorbing web II, an energy-absorbing web III, an energy-absorbing web IV, an energy-absorbing web V, a base bottom plate and a base bottom plate; a plurality of negative Poisson ratio unit cells are arranged between the base panel and the base bottom plate and between the base panel and the base bottom plate, the negative Poisson ratio unit cells form a base block, and the structure of the negative Poisson ratio unit cells is in a concave hexagon shape;

the energy absorption web I, the energy absorption web II, the energy absorption web III, the energy absorption web IV and the energy absorption web V are all obtained by arraying a large number of negative Poisson's ratio unit cell structures with the same structure in a plane;

the bottom of the base block body is provided with a boss, and the base bottom plate, the base bottom plate and the side edge of the boss lean against each other to realize positioning.

The concave hexagon: the length B of the two bottom edges is 75mm, the vertical distance H of the two bottom edges is 77mm, and the included angle theta between the bottom edges and the adjacent bevel edge is 64.5 degrees; the wall thickness of the negative poisson ratio structure unit cell is 12 mm.

The invention has the beneficial effects that:

compared with the prior art, the high-speed test bed vibration damping base based on the negative Poisson ratio structure combines the characteristics of light weight, good rigidity and strength of a negative Poisson ratio material; meanwhile, the material with the negative Poisson's ratio structure shows special deformation performance different from that of a common material when stressed, and has the characteristics of more stable mechanical property and regular structure. Therefore, the vibration damping base can stably and controllably compress, deform and absorb vibration energy as much as possible under the action of unbalanced force of the shafting, the vibration is alleviated, the stability of the motor test bed is enhanced, and the accuracy of the platform detection system is improved.

Drawings

FIG. 1 is a schematic structural diagram of a vibration damping base of a high-speed test bed based on a negative Poisson's ratio structure in an embodiment of the invention.

Fig. 2 is a schematic structural diagram of a base panel according to an embodiment of the present invention.

Fig. 3 is a schematic structural diagram of a base plate according to an embodiment of the present invention.

Fig. 4(a) is a structural front view of a negative poisson's ratio cell provided by an embodiment of the present invention.

FIG. 4(b) right side view of FIG. 4(a) of the present invention.

Fig. 5 is a simulation schematic diagram of a vibration damping base of a high-speed test bed with a negative poisson's ratio structure according to an embodiment of the invention.

Fig. 6 is a simulation schematic diagram of a vibration damping base of a high-speed test bed with a positive poisson's ratio structure according to an embodiment of the invention.

In the figure:

1-a base panel; 2-energy absorbing web I; 3-energy absorbing web II; 4-energy absorbing web III; 5-energy absorbing web four; 6-energy-absorbing web five; 7-base bottom plate I; 8-base bottom plate two.

Detailed Description

Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

As shown in fig. 1-5, a high-speed test bed vibration damping base based on a negative poisson's ratio structure is characterized by comprising a base panel 1, an energy-absorbing web I2, an energy-absorbing web II 3, an energy-absorbing web III 4, an energy-absorbing web IV 5, an energy-absorbing web V6, a base bottom plate 7 and a base bottom plate 8; a plurality of negative Poisson ratio unit cells are arranged between the base panel 1 and the base bottom plate 7 and the base bottom plate 8, the negative Poisson ratio unit cells form a base block, and the structure of the negative Poisson ratio unit cells is concave hexagon;

the energy-absorbing web I2, the energy-absorbing web II 3, the energy-absorbing web III 4, the energy-absorbing web IV 5 and the energy-absorbing web V6 are obtained by arraying a large number of negative Poisson's ratio unit cell structures with the same structure in a plane;

the bottom of the base block body is provided with a boss, and the base bottom plate 7 and the base bottom plate 8 lean against the side edge of the boss to realize positioning; a base panel is arranged above the first energy-absorbing web 2, the second energy-absorbing web 3, the third energy-absorbing web 4, the fourth energy-absorbing web 5 and the fifth energy-absorbing web 6.

The concave hexagon: the length B of the two bottom edges is 75mm, the vertical distance H of the two bottom edges is 77mm, and the included angle theta between the bottom edges and the adjacent bevel edge is 64.5 degrees; the wall thickness of the negative poisson ratio structure unit cell is t 12 mm.

In the embodiment of the invention, the base panel, the first energy-absorbing web 2, the second energy-absorbing web 3, the third energy-absorbing web 4, the fourth energy-absorbing web 5, the fifth energy-absorbing web 6, the base bottom plate 7 and the base bottom plate 8 are all made of steel.

In the embodiment of the invention, the base panel 1, the energy-absorbing web I2, the energy-absorbing web II 3, the energy-absorbing web III 4, the energy-absorbing web IV 5, the energy-absorbing web V6, the base bottom plate 7 and the base bottom plate 8 are welded together.

As shown in the figure, the energy-absorbing web I2, the energy-absorbing web II 3, the energy-absorbing web III 4, the energy-absorbing web IV 5 and the energy-absorbing web V6 are longitudinally obtained after a large number of negative poisson ratio unit cell structure in-plane arrays with the same structure (the number of structural groups is determined by the macroscopic size of a base) are constructed, namely, a plurality of groups of negative poisson ratio unit cell structure in-plane arrays with the same structure are longitudinally obtained after the arrays are constructed;

as shown in fig. 4(a) to (b), in the negative poisson ratio cell structure: the length B of the two bottom edges is 75mm, the vertical distance H of the two bottom edges is 77mm, and the included angle theta between the bottom edges and the adjacent bevel edge is 64.5 degrees; the wall thickness of the negative Poisson ratio single cell structure is S-12 mm, the thickness M of the negative Poisson ratio single cell structure in the energy absorption web plate I2, the energy absorption web plate II 3, the energy absorption web plate III 4 and the energy absorption web plate IV 5 is 120mm, and the thickness M of the negative Poisson ratio single cell structure in the energy absorption web plate V6 is 415 mm.

The working principle of the invention is as follows: external exciting force acts on the base panel 1 and then is transmitted to the first energy-absorbing web 2, the second energy-absorbing web 3, the third energy-absorbing web 4, the fourth energy-absorbing web 5 and the fifth energy-absorbing web 6, and the negative poisson ratio units on the first energy-absorbing web 2, the second energy-absorbing web 3, the third energy-absorbing web 4, the fourth energy-absorbing web 5 and the fifth energy-absorbing web 6 can expand transversely when being subjected to longitudinal tension and contract transversely when being subjected to longitudinal pressure, so that more vibration energy can be absorbed compared with the traditional material, and the effect of alleviating vibration is achieved.

Under the same conditions, the following parameters of the negative poisson's ratio structure high-speed test bed base in the embodiment and the positive poisson's ratio structure high-speed test bed base in the prior art are tested:

the structure of the negative poisson's ratio model in this example is shown in fig. 4, the three poisson's ratio models are all made of steel materials, and the densities are all 7980kg/m³The Poisson's ratio and the elastic modulus are both 0.3 and 193GPa, the two set models are analyzed by finite element software, as shown in FIGS. 5 and 6, the constraint modes are bolt holes on the base bottom plate 7 and the base bottom plate 8, simple harmonic force F is applied to the partial surfaces A and D of the base panel, the pressure is both 120N, and the frequency range is 0-120 Hz. By vibration levelThe fall is used as an evaluation standard of the vibration reduction effect, and another upper measuring point and a lower measuring point of B-C and E-G are respectively selected on the two models to obtain the vibration level fall. The test parameters for both models are shown in table 1. Simulation results show that the negative poisson's ratio structure base has a good vibration reduction effect.

TABLE 1 measurement of the vibration level drop between points B-C and E-G

It is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," and the like in the foregoing description are used for indicating or indicating the orientation or positional relationship illustrated in the drawings, and are used merely for convenience in describing embodiments of the present invention and for simplifying the description, and do not indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the embodiments of the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the embodiments of the present invention, "a plurality" means two or more unless specifically limited otherwise.

In the embodiments of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," "fixed," and the like are to be construed broadly, e.g., as being fixedly connected, detachably connected, or integrated; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In embodiments of the invention, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise the first and second features being in direct contact, or the first and second features being in contact, not directly, but via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples described in this specification can be combined and combined by those skilled in the art.

Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the invention and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the invention being indicated by the following claims.