A Multistable Nonlinear Energy Well with Piecewise Linear Beams and Permanent Magnetic Negative Stiffness

Abstract

The invention relates to a multi-stable nonlinear energy well with a piecewise linear beam and permanent magnet negative stiffness. The multi-stable nonlinear energy well comprises the piecewise linear beam which is composed of three piecewise linear rods with different stiffness. One end of the piecewise linear beam is fixed to a piecewise linear beam pedestal, and the other end of the piecewiselinear beam is inserted into an MNES mass block. During installation, a certain pre-compression amount is reserved between the piecewise linear rods of the two sides and the MNES mass block. A gap isreserved between the piecewise linear rod in the middle and the MNES mass block. Along with up-and-down movement of the MNES mass block, the compression amount between the MNES mass block and the piecewise linear beam is changed, and piecewise linear positive stiffness is produced. The required negative stiffness is produced through inner magnets and outer magnets, and required multiple stable positions are constructed through the optimal cooperation of the positive stiffness and negative stiffness. Vibration energy of a to-be-damped system is transmitted into the energy well in a unidirectional mode, and finally the energy is rapidly dissipated through damping by the energy well, and thus main system vibrations can be efficiently restrained. The energy well is simple in structure, wide invibration suppressing frequency band and remarkable in vibration suppressing effect.

Description

technical field [0001] The invention belongs to the field of vibration-absorbing devices, and relates to a multi-stable non-linear energy well with segmented linear beams and permanent magnet negative stiffness. Background technique [0002] At present, mechanical equipment is in a period of rapid development, and the application of mechanical equipment in various fields is becoming more and more extensive. Vibration is inevitable during the operation of mechanical equipment. Vibration will not only cause fatigue damage to mechanical equipment, but also cause a sharp drop in the accuracy of mechanism movement. If it is not controlled, it will not only affect the operation of the equipment and cause economic losses. Serious It may even have catastrophic consequences, so how to effectively control vibration has attracted more and more attention. [0003] In recent years, people often use passive vibration absorbers in vibration control. Its structure is simple, but due to its...

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Problems solved by technology

Vibration is inevitable during the operation of mechanical equipment. Vibration will not only cause fatigue damage to mechanical equipment, but also cause a sharp drop in the accuracy of mechanism movement. If it is not controlled, it will not only affect the operation of the equipment and cause economic losses, serious It may even have catastrophic consequences, so how to effectively control vibration has attracted more and more attention

[0003] In recent years, people often use passive vibration absorbers in vibration control, which has a simple structure, but due to its narrow vibration reduction frequency range, the vibration reduction effect deteriorates when the external excitation frequency changes; active vibration absorbers add active Control, so that it has better broadband vibration suppression performance, but the active vibration absorber has a large mass, complex structure, and poor reliability, so the use of the above two types of vibration absorbers has certain limitations

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