A geometric nonlinear adjustable multi-stable device

A geometrically nonlinear, multi-stable technology, applied in linear motion bearings, non-rotating vibration suppression, shafts and bearings, etc. Inability to adjust and other problems, to achieve the effect of simple structure, good adjustability, and stable position adjustment

Active Publication Date: 2022-04-05
NORTHWESTERN POLYTECHNICAL UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to solve the shortcomings of the existing multi-stable mechanism, such as complex structure, unadjustable stroke, and difficult adjustment of the number of stable states, and for the design and application of geometric nonlinear multi-stable systems with high-order quasi-zero stiffness characteristics Insufficiency of few researches, but provides a geometrically nonlinear tunable multi-stable device that satisfies multiple specific functions

Method used

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  • A geometric nonlinear adjustable multi-stable device
  • A geometric nonlinear adjustable multi-stable device
  • A geometric nonlinear adjustable multi-stable device

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Effect test

Embodiment approach 1

[0060] Embodiment 1: A geometrically nonlinear adjustable multi-stable system based on a spring-mass system

[0061] combine figure 1 , the implementation of the multi-stable unit 3 of this scheme is as follows figure 2 shown. The support 31 in the multi-stable unit 3 is hinged; the elastic member is a linear spring 32 and is symmetrically distributed on both sides of the second mass block 33 .

[0062] The multi-stable vibration energy harvesting system based on the geometrically nonlinear adjustable multi-stable device of the spring-mass system is provided with electromechanical conversion elements on the first mass block and the elastic element of the basic device.

[0063] A multi-stable vibration energy harvesting method for a geometrically nonlinear adjustable multi-stable device based on a spring-mass system, comprising the following steps:

[0064] The first step is to install the electromechanical conversion element 7, the electromechanical conversion element 7 is...

Embodiment approach 2

[0079] Embodiment 2: Beam-based geometric nonlinear adjustable multi-stable system

[0080] combine figure 1 , the implementation of the multi-stable unit 3 of this scheme is as follows image 3 shown. The support 31 in the multistable unit 3 is fixed; the elastic member, the second mass block and the second guide rail are all replaced by beam buckling.

[0081] The vibration energy harvesting method of the beam-based geometrically nonlinear adjustable multi-stable system includes the following steps:

[0082] The first step is to install the electromechanical conversion element 7. The electromechanical conversion element 7 is composed of a permanent magnet 71, a conductive coil 72 and a piezoelectric ceramic or piezoelectric film 73; the permanent magnet 71 is installed on the first mass block 5, and the conductive coil 72 is arranged on the The moving direction of the permanent magnet 71, the piezoelectric ceramic or the piezoelectric film 73 is pasted on the root of the ...

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Abstract

The invention provides a geometrically nonlinear adjustable multi-stable device, which solves the shortcomings of the existing multi-stable mechanism, such as complex structure, unadjustable stroke, and difficult adjustment of the number of stable states. The design of nonlinear multistable systems and its applications are little studied problems. The geometrically nonlinear adjustable multistable device provides a basic multistable unit through the configuration of the elastic element, the support and the second mass block, and the variation between different multistable mechanisms can be realized by utilizing the adjustable properties of geometric parameters , the variant process does not need to add any other devices, which effectively avoids the efficiency and cost problems caused by the loading and unloading of different multi-stable mechanisms in the system, and has the characteristics of practicality, low energy consumption, and low cost.

Description

technical field [0001] The invention belongs to the technical field of nonlinear dynamics and control, and relates to a geometric nonlinear adjustable multi-stable device. Background technique [0002] Geometric nonlinear systems have been widely used in aerospace, aviation, navigation, weapon equipment, medical treatment, machining, energy harvesting and other fields. The simplest form of a geometrically nonlinear system is a single-degree-of-freedom monostable structure, in which the system has only one stable equilibrium state and one oscillating mass. In recent years, scholars at home and abroad have proposed a new type of geometric nonlinear quasi-zero stiffness vibration isolator by using the method of parallel connection of monostable positive stiffness elements and bistable negative stiffness elements. The quasi-zero stiffness vibration isolation system has excellent characteristics such as high static and low dynamic stiffness, which can improve the vibration isola...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16C29/02F16C29/00F16F15/02F16F15/06
CPCF16C29/02F16C29/002F16F15/02F16F15/06
Inventor 杨涛刘嘉一宋鹏坤蔡翔宇刘卿池
Owner NORTHWESTERN POLYTECHNICAL UNIV
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