Parallel and adjustable-frequency negative-stiffness vibration absorbing device

Abstract

The invention discloses a parallel and adjustable-frequency negative-stiffness vibration absorbing device. The device comprises an upper bearing plate, secondary structures and a base, wherein the secondary structures are two distributed rectangular rings, namely, an inner rectangular ring and an outer rectangular ring; each rectangular ring comprises four secondary structures; each secondary structure comprises a negative-stiffness unit, a positive-stiffness unit and a common damping component; the negative-stiffness units comprise inner magnets, outer magnets and conducting rods; the positive-stiffness units comprise upper mechanical springs, upper connectors, lower mechanical springs and lower connectors; and the common damping components are uniformly distributed on an outer annular frame. According to the device, the stiffness of the upper mechanical springs of the secondary structures of the inner rectangular ring and the outer rectangular ring, and the damping coefficients of the common damping components are set to achieve the vibration absorbing effect of each frequency point within a low frequency brand, and thus the purpose of performing adjustable-frequency vibration absorbing on specific frequency vibration of an instrument within the low frequency brand can be achieved.

Description

technical field [0001] The invention belongs to the field of precision vibration reduction, and in particular relates to a parallel frequency-adjustable negative stiffness vibration reduction device. Background technique [0002] With the rapid development of science and technology and social economy, civilian and military fields such as medical production and aerospace electronics production are all developing towards high precision. Therefore, the working environment required for high-precision precision instruments in various fields is even more demanding. Harsh. Low-frequency vibration is very harmful to precision instruments. To deal with the harm of low-frequency vibration, the negative stiffness structure can effectively solve the problem of poor low-frequency isolation effect of traditional vibration isolation instruments, and the cost of this structure is lower. However, general negative stiffness devices can only reduce vibration at a specific frequency point, wh...

AI Technical Summary

Problems solved by technology

However, general negative stiffness devices can only reduce vibration at a specific frequency point, which cannot meet the requirements of more stringent precision instruments. For example, some precision instruments require a wider frequency band for vibration reduction, and within this frequency band need Each frequency point has better adjustable frequency vibration reduction effect

Images