A Negative Stiffness Device with Convenient Adjustment

Abstract

The invention provides a negative stiffness device with convenient adjustment, which belongs to the technical field of vibration control, and includes two sets of preloaded spring mechanisms symmetrically hinged to the connecting seat, each set of preloaded spring mechanisms includes a spring seat 1, a spring, and a spring seat 2 and the adjusting screw, the spring is compressed by the spring seat 1 and the spring seat 2; the spring seat 2 is connected with the spring seat 1 by sliding fit; the adjusting screw with external thread is connected with the spring seat 2 through threads and tightened by the lock nut; the spring seat One is hinged with the frame. When the connecting seat moves up and down, the resultant force of the two sets of symmetrically arranged preload spring mechanisms on the connecting seat is consistent with the displacement direction of the connecting seat, and its stiffness is negative, and its size is proportional to the displacement. By changing the screw rotation Enter the depth of spring seat 2 to achieve the purpose of changing the negative stiffness.

Description

technical field [0001] The invention relates to a conveniently adjustable negative stiffness device, which belongs to the technical field of vibration control equipment. Background technique [0002] Vibration is harmful in most engineering situations. Mechanical vibration will not only generate noise but also reduce the working accuracy and life of equipment. Lowering the natural frequency of the system can effectively isolate low-frequency vibrations. Reducing the support stiffness of the vibration isolation system and increasing the mass of the vibration-isolated object can reduce the natural frequency, but directly reducing the stiffness of the elastic element will lead to an increase in the overall size of the vibration isolation system, and in most cases the overall size of the vibration isolation system is limited Limitations in the operating conditions of the object; the ability to improve low-frequency vibration isolation performance by adding mass is also limited....

AI Technical Summary

Problems solved by technology

Reducing the support stiffness of the vibration isolation system and increasing the mass of the vibration-isolated object can reduce the natural frequency, but directly reducing the stiffness of the elastic element will lead to an increase in the overall size of the vibration isolation system, and in most cases the overall size of the vibration isolation system is limited Limitations in object operating conditions; limited ability to improve low-frequency vibration isolation performance by adding mass

Therefore, the vibration reduction and vibration isolation system with positive stiffness characteristics is often difficult to achieve satisfactory results in vibration isolation and vibration reduction.

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