A Quasi-Zero Stiffness Vibration Isolator Using Piezoelectric Sheets for Neutral Adjustment

Abstract

The invention aims to provide a quasi-zero stiffness vibration isolator adopting piezoelectric plates for centering performance adjustment. The quasi-zero stiffness vibration isolator adopting the piezoelectric plates comprises a supporting plate and a base. Mechanical springs, a stator and a rotor are installed between the supporting plate and the base. The stator is fixed to the base. A coil iswound on the stator. The rotor is located outside the stator. The supporting plate and a rotor installing seat are installed at the upper end and lower end of the rotor through supporting rods. The supporting rods are fixed to the supporting plate. The lower ends of the supporting rods are located in guide holes of the rotor installing seat. The rotor installing seat is located above the base andprovided with linear bearings. Guide shafts are arranged on the base, penetrate through the rotor installing seat and are matched with the linear bearings to form linear movement pairs. The two sidesof each linear movement pair are each provided with one supporting rod. By combining leaf springs with piezoelectric materials, the whole adjustment mechanism is greatly simplified, so that the structure is more reliable and not prone to have faults, adjustment is more convenient and rapider, response is rapider, and the height-diameter ratio is small.

Description

Technical field [0001] The invention relates to a vibration isolator, specifically a quasi-zero stiffness vibration isolator. Background technique [0002] Quasi-zero stiffness systems have higher requirements for the position of the intermediate mass, while semi-active electromagnetic isolators require more stringent requirements. When the load of the system changes, the intermediate mass will deviate from the equilibrium position and reduce the system's vibration isolation effect Therefore, the quasi-zero stiffness system generally requires a matching center position adjustment mechanism to ensure the normal operation of the system. The known center position adjustment mechanism is divided into mechanical and electronic control. The most common mechanical adjustment mechanism is to adjust the pre-compression of the support spring. It includes two parts: an adjustment mechanism and a locking mechanism. There are many parts, and the processing cost is high. The adjustment process...

AI Technical Summary

Problems solved by technology

This patent has a set of mechanical adjustment mechanism, which can adjust the pre-tightening screw of the transverse spring part to realize the ability to change the vibration isolation bandwidth of the system. Not compact and takes up a lot of space, so it is not suitable for engineering applications

[0006] The patent with the publication number CN 105972370 A discloses a new type of semi-active pipeline vibration absorber with variable stiffness. The vibration absorption effect, however, the use of elastic materials with nonlinear stiffness such as leaf springs as the main bearing mechanism increases the difficulty of control

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