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

Abstract

The invention provides a multi-stable nonlinear energy trap with a segmented linear beam and permanent magnet negative stiffness, which includes a segmented linear beam composed of three segmented linear rods with different stiffnesses, one end of which is fixed on the segmented linear beam base. On the top, the other end is inserted into the MNES mass block. During installation, the segmented linear rods on both sides have a certain amount of pre-compression with the MNES mass block. There is a gap between the segmented linear rods in the middle and the MNES mass block. As the MNES mass block moves up and down , causing the compression amount between it and the piecewise linear beam to change, producing piecewise linear positive stiffness. The required negative stiffness is generated through the inner and outer magnets, and the multiple required steady-state positions are constructed using the optimal combination of positive and negative stiffness. The vibration energy of the system to be damped is transmitted in one direction to the energy well of the present invention, and is eventually quickly dissipated through the damping of the energy well, thereby achieving efficient suppression of the vibration of the main system. The energy trap has a simple structure, wide vibration suppression frequency, and remarkable vibration suppression 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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