A Nonlinear Compensator for Zero-Power Control and Its Application to Vibration Isolation System

2005 ◽  
Author(s):  
Md. Emdadul Hoque ◽  
Tetsuro Kamiya ◽  
Takeshi Mizuno
Keyword(s):  
Power Control ◽  
Vibration Isolation ◽  
Isolation System ◽  
Vibration Isolation System ◽  
Nonlinear Compensator

Development of an Active Vibration Isolation System Using Linearized Zero-Power Control With Weight Support Springs

2010 ◽  
Vol 132 (4) ◽  
Author(s):  
Md. Emdadul Hoque ◽  
Takeshi Mizuno ◽  
Daisuke Kishita ◽  
Masaya Takasaki ◽  
Yuji Ishino
Keyword(s):  
Power Control ◽  
Vibration Isolation ◽  
Permanent Magnets ◽  
Ground Vibration ◽  
Original System ◽  
Isolation System ◽  
Vibration Isolation System ◽  
Weight Support ◽  
In Series ◽  
Nonlinear Compensator

This paper presents a hybrid vibration isolation system using linearized zero-power control with weight support springs. The isolation system, fundamentally, is developed by linking a mechanical spring in series with a negative stiffness spring realized by zero-power control in order to insulate ground vibration as well as to reject the effect of on-board-generated direct disturbances. In the original system, the table is suspended from the middle table solely by the attractive force produced by the magnets and therefore, the maximum supporting force on the table is limited by the capacity of the permanent magnets used for zero-power control. To meet the growing demand to support heavy payload on the table, the physical model is extended by introducing an additional mechanism-weight support springs, in parallel with the above system. However, the nonlinearity of the zero-power control instigates a nonlinear vibration isolation system, which leads to a deviation from zero compliance to direct disturbance. Therefore, a nonlinear compensator for the zero-power control is employed furthermore to the system to meet the ever-increasing precise disturbance rejection requirements in the hi-technology systems. The fundamental characteristics of the system are explained analytically and the improved control performances are demonstrated experimentally.

A modified zero-power control and its application to vibration isolation system

2011 ◽  
Vol 18 (12) ◽  
pp. 1788-1797 ◽  
Author(s):  
Md Emdadul Hoque ◽  
Takeshi Mizuno ◽  
Yuji Ishino ◽  
Masaya Takasaki
Keyword(s):  
Power Control ◽  
Vibration Isolation ◽  
Isolation System ◽  
Vibration Isolation System

Design and analysis of a vibration isolation system with cam–roller–spring–rod mechanism

2021 ◽  
pp. 107754632110005
Author(s):  
Yonglei Zhang ◽  
Guo Wei ◽  
Hao Wen ◽  
Dongping Jin ◽  
Haiyan Hu
Keyword(s):  
Vibration Isolation ◽  
Dynamic Stiffness ◽  
Experimental Studies ◽  
Excitation Amplitude ◽  
Isolation System ◽  
Vibration Isolation System ◽  
Stiffness Characteristic ◽  
Negative Stiffness Mechanism ◽  
Isolation Systems ◽  
Vibration Isolation Performance

The vibration isolation system using a pair of oblique springs or a spring-rod mechanism as a negative stiffness mechanism exhibits a high-static low-dynamic stiffness characteristic and a nonlinear jump phenomenon when the system damping is light and the excitation amplitude is large. It is possible to remove the jump via adjusting the end trajectories of the above springs or rods. To realize this idea, the article presents a vibration isolation system with a cam–roller–spring–rod mechanism and gives the detailed numerical and experimental studies on the effects of the above mechanism on the vibration isolation performance. The comparative studies demonstrate that the vibration isolation system proposed works well and outperforms some other vibration isolation systems.

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