Negative-stiffness device convenient to adjust

Abstract

The invention provides a negative-stiffness device convenient to adjust, and belongs to the technical field of vibration control. The negative-stiffness device comprises two pre-pressure spring mechanisms. The pre-pressure spring mechanisms are symmetrically hinged to a connecting seat, each pre-pressure spring mechanism comprises a first spring seat, a spring, a second spring seat and an adjusting screw, and the springs can be compressed by the first spring seats and the second spring seats; the second spring seats are connected with the first spring seats in a slide fit manner; the adjustingscrews with external threads are connected with the second spring seats in a threaded manner and can be tightened by the aid of locking nuts; the first spring seats are hinged to frameworks. The negative-stiffness device has the advantages that resultant force of acting force of the two symmetrically arranged pre-pressure spring mechanisms on the connecting seat is consistent with the displacement directions of the connecting seat when the connecting seat moves in the up-down directions, the stiffness is a negative value, the magnitude of the stiffness and displacement have proportional relations, the screw-in depths of the adjusting screws in the second spring seats can be changed, and accordingly the purpose of changing the magnitude of the negative stiffness can be achieved.

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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