The Use of Rubber in Vibration Isolation: Including the Case of Six Degree of Freedom Systems

1937 ◽  
Vol 4 (3) ◽  
pp. A109-A114
Author(s):  
E. H. Hull
Keyword(s):  
Elastic Properties ◽  
Elastic Material ◽  
Vibration Isolation ◽  
Natural Frequencies ◽  
Degree Of Freedom ◽  
Modes Of Vibration ◽  
Six Degree Of Freedom

Abstract The desirable properties of an elastic material applicable to many types of vibration-isolation problems are outlined. Of those materials at present available, rubber appears most suitable for this type of work. The general elastic properties of rubber are discussed and data given for determining the stiffness of pads made from one particular compound. Equations are developed for the six natural frequencies and associated modes of vibration of a mass supported on elastic pads and examples of vibration isolation worked out using this theory.

Vibration isolation using six degree-of-freedom quasi-zero stiffness magnetic levitation

2015 ◽  
Vol 358 ◽  
pp. 48-73 ◽  
Author(s):  
Tao Zhu ◽  
Benjamin Cazzolato ◽  
William S.P. Robertson ◽  
Anthony Zander
Keyword(s):  
Vibration Isolation ◽  
Magnetic Levitation ◽  
Degree Of Freedom ◽  
Six Degree Of Freedom

A novel quasi-zero-stiffness strut and its applications in six-degree-of-freedom vibration isolation platform

2017 ◽  
Vol 394 ◽  
pp. 59-74 ◽  
Author(s):  
Jiaxi Zhou ◽  
Qingyu Xiao ◽  
Daolin Xu ◽  
Huajiang Ouyang ◽  
Yingli Li
Keyword(s):  
Vibration Isolation ◽  
Degree Of Freedom ◽  
Six Degree Of Freedom

Experimental Determination of the Complete Dynamical Properties of a Two-Degree-Of-Freedom Model Having Nearly Coincident Natural Frequencies

1967 ◽  
Vol 9 (5) ◽  
pp. 402-413 ◽  
Author(s):  
R. W. Traill-Nash ◽  
G. Long ◽  
C. M. Bailey
Keyword(s):  
Experimental Investigation ◽  
Experimental Determination ◽  
Natural Frequencies ◽  
Degree Of Freedom ◽  
Influence Coefficients ◽  
Stiffness Properties ◽  
Modes Of Vibration ◽  
Dynamical Properties ◽  
Two Degree Of Freedom

Existing techniques of resonance testing have shown a marked inability to find the principal modes, natural frequencies and levels of damping in a structure which possesses two or more close natural frequencies (1)§. This paper describes an experimental investigation on a two-degree-of-freedom model of a technique which makes use of dynamical influence coefficients (or receptances) measured at a number of stations on the structure (2) (3) (4) (5). The measured coefficients are used to calculate natural frequencies and modes of vibration, and the mass, damping and stiffness properties of the system. Several model configurations having different natural frequency separations were tested and no special difficulty resulted when natural frequencies were close or even coincident.

scholarly journals Benefit of Relaxation-Type Damping on the Performance of a Six-Degree-of-Freedom Microvibration Isolation Device for Control Moment Gyroscope

2021 ◽  
Vol 2021 ◽  
pp. 1-11
Author(s):  
Xingtian Liu ◽  
Changbao Shao ◽  
Liping Zhou ◽  
Xiangsen Kong
Keyword(s):  
Vibration Isolation ◽  
Euler Method ◽  
Degree Of Freedom ◽  
Dynamic Responses ◽  
Control Moment ◽  
Experimental Apparatus ◽  
Isolation Device ◽  
Six Degree Of Freedom ◽  
Vibration Isolation Performance ◽  
Isolation Performance

In order to provide an ultraquiet environment for spacecraft payload, a six-degree-of-freedom microvibration isolation device for satellite control moment gyro (CMG) is proposed in this paper. The dynamic characteristics of the microvibration isolation device are analyzed theoretically and experimentally. The dynamic equations of the microvibration suppression device are established by using the Newton–Euler method. The dynamic responses are numerically solved and the frequency-domain characteristics of the microvibration isolation device under base excitation are analyzed. The analytical results are first verified numerically, and the two results are in good accordance. The experimental apparatus is built, and the vibration isolation performance is investigated. The acceleration transfer function is measured and the influence of the excitation amplitude on the vibration isolation performance is performed. It is shown that the amplification factor at the vicinity of the resonance frequency is within 10 dB, and the vibration isolation performance is significant at higher frequencies. The vibration attenuation performance at the main frequency of the CMG (100 Hz) is more than 30 dB. The microvibration suppression device can effectively suppress the microvibration generated by CMG during orbital operation.

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