Bearing and vibration isolation integrated plate shell superstructure and design method thereof

Abstract

The invention discloses a bearing and vibration isolation integrated plate shell superstructure and a design method thereof, and belongs to the technical field of plate shell vibration isolation. Thestructure comprises a plate shell and a plurality of microstructure components, the microstructure component is of a uniform-section block structure, the section contour line of the microstructure component is composed of a bottom edge and two arcsine-like function curves, and the intersection point of the two arcsine-like function curves forms a beak tip. The bottom surface of the microstructurecomponent is connected with the plate shell; and the plurality of microstructure components are periodically arranged to form an array to separate the vibration source from the protected object. Whenelastic waves excited by the vibration source are propagated to the periphery of the array from any direction along the plate shell, the microstructure component generates bending and torsional vibration under the influence of the elastic waves, and the microstructure can generate force and moment effects on the plate shell, so that propagation of the elastic waves in the plate shell is inhibited,and isolation of incident elastic waves in any direction at a high frequency band in the plate shell is realized. The structure is simple, machining is convenient, a protected object and a vibrationsource can be isolated at the same time, and the good bearing and vibration isolation capacity is achieved.

Description

technical field [0001] The invention belongs to the technical field of plate shell vibration isolation, and in particular relates to a plate shell superstructure integrated with load bearing and vibration isolation and a design method thereof. Background technique [0002] Plate and shell structures are widely used in aerospace, civil engineering, vehicles, ships and other fields to fix various instruments and equipment. In actual engineering, some equipment will generate shock and vibration during operation. These shocks and vibrations will excite elastic waves in the plate shell, and the elastic waves will propagate in the plate to other equipment, causing other equipment to fail or be damaged. Therefore, vibration isolation of specific areas in the shell structure is an important issue. [0003] Existing vibration isolation technologies are divided into passive vibration isolation (no external energy supply required) and active vibration isolation (requires external ener...

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Problems solved by technology

[0004] However, the existing vibration isolator has the following disadvantages: 1) the existing vibration isolator has a large volume and a large additional mass, which is not conducive to the miniaturization and light weight of the vibration isolator; 2) the damping material of the existing vibration isolator is mostly rubber, and The Young's modulus of the rubber material is 4 to 5 orders of magnitude lower than that of metal materials such as 304 steel, resulting in low stiffness of the damping vibration isolator, large deformation, and low load-bearing capacity; (Processed from metals such as steel and aluminum) The materials are different, and the design of the separation of the vibration isolation structure and the load-bearing structure makes the integrated processing difficult; 4) The rubber will age under the influence of mechanical stress, light, heat, etc., resulting in turtles. Cracking, softening, stickiness and other phenomena will affect the vibration isolation effect of the damping isolator; 5) The geometric parameters, elastic stiffness and damping characteristics of the existing vibration isolator cannot be changed once the design is completed. When the protected object changes, The entire vibration isolator needs to be redesigned, and the cost is high

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