Active Stiffness and Damping Control of Air Mounted/Suspended Systems

2008 ◽  
Author(s):  
Pooya Mahmoudian ◽  
Reza Kashani
Keyword(s):  
Vibration Isolation ◽  
Active Damping ◽  
Operating Conditions ◽  
Isolation System ◽  
On Demand ◽  
Damping Control ◽  
Low Stiffness ◽  
Stiffness Control ◽  
Shock Isolation ◽  
Stiffness And Damping

Passive mounts/springs with negligible damping and low stiffness are highly effective in isolating vibration but have poor shock isolation characteristics. This and other contradictory traits of passive mounts, make the realization of an ideal, uncompromised isolation system unfeasible. To avoid an isolation system design based on a compromise among its conflicting requirements, a degree of real-time, on-demand adjustability should be built into the mounting system. Air springs/mounts, because of their inherent adjustability, are the best candidate for such adjustable isolation; other passive mounts, e.g. elastomeric, would require the introduction of an additional active element/actuator to work in parallel with the mount. In this proposed adjustable air mounting system, shock isolation can be enhanced without undermining the vibration isolation effectiveness by using an on-demand, active damping scheme which adds various levels of damping to an air mounted/suspension application, e.g., the cab in a truck, depending on the instantaneous urgency of shock isolation over vibration isolation. In addition, the proposed adjustable isolation scheme contains an on-demand, active stiffness control working in parallel with the active damping scheme. Depending on the operating conditions, the stiffness of the mount will be lowered to better its vibration isolation or increased to enhance its shock isolation. The active damping and stiffness control along with other on-demand adjustment tactics for an air isolation system are described, numerically examined, and experimentally demonstrated.

228 Active Damping Control on Vibration Isolation System of Centrifuge Rotor

2001 ◽  
Vol 2001.7 (0) ◽  
pp. 273-276
Author(s):  
Fumio OTSUKI ◽  
Hirohiko UEMATSU ◽  
Yasuhiro NAKAMURA ◽  
Yuichi CHIDA ◽  
Ryo FURUKAWA ◽  
...  
Keyword(s):  
Vibration Isolation ◽  
Active Damping ◽  
Isolation System ◽  
Vibration Isolation System ◽  
Damping Control ◽  
Centrifuge Rotor ◽  
Active Damping Control

Study on the Application of Damping Control Method in Multi-Solution Interval of the QZS System

2013 ◽  
Vol 457-458 ◽  
pp. 1017-1020
Author(s):  
Qing Chao Yang ◽  
Jing Jun Lou ◽  
Ai Min Diao
Keyword(s):  
Small Amplitude ◽  
Vibration Isolation ◽  
Control Method ◽  
Excitation Frequency ◽  
Main Idea ◽  
Isolation System ◽  
Vibration Isolation System ◽  
Damping Control ◽  
Controlling System ◽  
Vibration Attenuation

The quasi-zero-stiffness system (QZS) is a nonlinear vibration isolation system, when the excitation frequency is in the multi-solution domain, the system may malfunctions in vibration attenuation. To solve this problem, the damping control method is introduced in this paper. The main idea is that the response on the resonance branch with large amplitude can switches to the non-resonance branch with small amplitude by controlling system damping, and it can stay on the non-resonance branch in the next process, which makes vibration isolation is also available in this interval. During this process, the Van den Pol plane is used to determine the time of which damping control can be withdrawn.

Dynamic Analysis of Bionic Vibration Isolation Platform Based on Viscoelastic Materials

2014 ◽  
Vol 852 ◽  
pp. 467-471
Author(s):  
Hong Qing Lv ◽  
Wei Xiao Tang ◽  
Qing Hua Song
Keyword(s):  
Vibration Isolation ◽  
Excitation Frequency ◽  
Viscoelastic Damper ◽  
Physical Damage ◽  
Isolation System ◽  
Rubber Layer ◽  
Environmental Vibration ◽  
Performance Deterioration ◽  
Nonlinear Dynamics Model ◽  
Stiffness And Damping

The ecological structures of some organisms that could resist environmental vibration naturally (such as dragonfly, woodpecker and legs of cursorial animals) uncovered by biologists inspire people a new approach to overcome the above problem. In this paper, a new shock isolation system consisting of a pedestal, a rubber layer, an air spring and a shearing viscoelastic damper is designed, fabricated, and characterized to avoid the performance deterioration and physical damage of mechanical manufacturing devices from external mechanical excitations. The nonlinear dynamics model of the platform is developed and the dynamic characteristics are analyzed using numerical analysis. The displacement and velocity response are obtained. The results demonstrate that the stiffness and damping characteristic of the platform change with excitation frequency. The vibration isolation effectiveness will be greatly enhanced.

scholarly journals Modeling and Dynamics of a MDOF Isolation System

2017 ◽  
Author(s):  
Youshuo Song ◽  
Xiuting Sun
Keyword(s):  
Vibration Isolation ◽  
Vibration Suppression ◽  
Structural Parameters ◽  
Structural Parameter ◽  
Isolation System ◽  
Passive Components ◽  
Vibration Isolation System ◽  
Joint Friction ◽  
Engineering Practices ◽  
Stiffness And Damping

This study analyzes the modeling and dynamics of a novel passive in Multi-Degree-of-Freedom (MDOF) vibration isolation platform which can achieve significant isolation effect. Symmetrical Scissor-Like structures (SLSs) are utilized in the proposed MDOF isolation platform as the supporting and isolation elastic components. Based on the mathematical modeling and theoretical analysis of the MDOF vibration isolation system with SLSs, the effect of structural parameter and joint friction on stiffness and damping properties is investigated. It is shown that due to geometric relations within the SLSs, the natural frequencies can be reduced via adjusting structural parameters of the SLS for different direction vibration isolation. Theoretical and experimental results show that the SLS isolation platform can achieve much better loading capacity and vibration isolation performance simultaneously by only using linear passive components because of the MDOF adjustable stiffness property. Therefore, with low costing and energy consumption, the proposed novel isolation platform can provide the improvement of vibration suppression in various engineering practices.

Optimization Design of Vibration and Shock Isolation System

2006 ◽  
Author(s):  
Cun-Sheng Zhao ◽  
Shi-Jian Zhu ◽  
Zhen-Zhong Zhang
Keyword(s):  
Optimal Design ◽  
Optimization Design ◽  
Vibration Isolation ◽  
Design Method ◽  
Engineering Application ◽  
Experimental Results ◽  
Isolation System ◽  
Combination Optimization ◽  
Shock Resistance ◽  
Shock Isolation

The combination optimization design problem of vibration isolation and shock resistance system is studied in consideration of acoustical concealment performance and lifeforce of ships. The weakness of design method based on continuity is pointed out and combination optimal design method is brought forward. Then the limiting performance of shock isolation system is analyzed and two realization methods are discussed. One method is to adopt linear stiffness component with large damping. The other method is to use multiple linear stiffness components without damping. Amplitude of steady excitation is much smaller than that of shock input during experiment. Experimental results showed that the optimal loss factor is still 0.4 when the stiffness of shock bumper is much larger than that of vibration isolator, just the same with that suffered from only shock loads. Experimental results also showed that limiting performance can be achieved by configuration optimal design using multiple linear components. The two discussed methods can be used to direct engineering application.

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