Dynamic Testing and Evaluation of the Torsional Vibration Absorber

1994 ◽  
Author(s):  
Mike Albright ◽  
Tim Crawford ◽  
Frank Speckhart
Keyword(s):  
Torsional Vibration ◽  
Dynamic Testing ◽  
Vibration Absorber ◽  
Testing And Evaluation

The Tuned and Damped Gyrostatic Vibration Absorber

1947 ◽  
Vol 157 (1) ◽  
pp. 1-19 ◽  
Author(s):  
R. N. Arnold
Keyword(s):  
Theoretical Prediction ◽  
Torsional Vibration ◽  
Forced Vibration ◽  
Theoretical Study ◽  
Experimental Investigations ◽  
Vibration Absorber ◽  
Viscous Damping ◽  
Mean Velocity ◽  
Mass System ◽  
Low Frequencies

The vibration absorber described in this paper consists of a gyrostat suspended symmetrically about an axis perpendicular to that of the torsional vibration which it is desired to suppress. The gyrostat is fitted with springs and a viscous damping mechanism which allow limited vibration about its axis. This device is a modification of that employed by Schlick (1904)†, in his attempt to stabilize the rolling of ships at sea. The new arrangement, however, is more efficient, is not restricted to very low frequencies, and is, in general, capable of application to vibration superposed on a mean velocity. A theoretical study is made of the response of such an absorber to one- and two-mass vibratory systems under both forced and self-induced vibration, and design methods are derived by which the essential dimensions for any given application may be readily determined. Experimental investigations with a gyrostatic absorber applied to a one-mass system under forced vibration are recorded, and the results compared with theoretical prediction. The design of a full-scale absorber built to suppress vibration of the table of a heavy planing machine is also given, together with the results obtained with the apparatus on trial.

Semi-active vibration control of a transmission system using a magneto-rheological variable stiffness and damping torsional vibration absorber

2021 ◽  
pp. 095440702199949
Author(s):  
Wenfeng Li ◽  
Xiaomin Dong ◽  
Jun Xi ◽  
Xiong Deng ◽  
Kaiyuan Shi ◽  
...  
Keyword(s):  
Active Control ◽  
Torsional Vibration ◽  
Variable Stiffness ◽  
Transmission System ◽  
Vibration Absorber ◽  
Experimental Setup ◽  
Variable Damping ◽  
Independent Variable ◽  
Magneto Rheological ◽  
Stiffness And Damping

In this research effort, an innovative magneto-rheological variable stiffness and damping torsional vibration absorber (MR-VSDTVB) is proposed, and independent variable damping control and independent variable stiffness control are adopted to suppress the torsional vibration of the transmission system. MR-VSDTVB, based on semi-active control principle, exhibits a compact structure and integrates with magneto-rheological technology. First, the concept of MR-VSDTVB is discussed, and the output torque characteristic of MR-VSDTVB is analytically developed. Then, a prototype is fabricated and tested. A transmission system with MR-VSDTVB is proposed to verify the MR-VSDTVB's effectiveness. The structure and inherent characteristics of the transmission system are analyzed theoretically. Finally, an experimental setup of transmission system with MR-VSDTVB is built. Experimental results indicate that when torsional stiffness of MR-VSDTVB changes, a frequency shift phenomenon occurs; moreover, when torsional damping of MR-VSDTVB changes, the response amplitude of the experimental setup changes regularly; And finally, the on-off control test validates the effectiveness of semi-active control on the torsional vibration suppression of the transmission system. The above results verify the effectiveness of MR-VSDTVB in suppressing the torsional vibration of the transmission system. These findings are expected to expand the application of magneto-rheological technology and variable stiffness and variable damping technology in torsional vibration of transmission systems.

Research on the Technology of Testing and Evaluation of the Existing Building Foundations

2011 ◽  
Vol 121-126 ◽  
pp. 1382-1386
Author(s):  
Zhen Shuan Zhang ◽  
Yu Deng ◽  
Shi Feng Fu
Keyword(s):  
Shear Wave Velocity ◽  
Static Loading ◽  
Dynamic Testing ◽  
Loading Test ◽  
Existing Building ◽  
Test Technology ◽  
Testing Technology ◽  
Static Loading Test ◽  
Testing And Evaluation

In this paper, some technologys are measured and studied with good applicability and reliability,such as static loading test technology,in situ sampling technology,shear wave velocity test technology,GPR testing technology,low strain dynamic testing and settlement observation technology. It can be popularized in engineering.

728 Dynamic Torsional Vibration Absorber by Wave Control

2000 ◽  
Vol 2000.75 (0) ◽  
pp. _7-61_-_7-62_
Author(s):  
Muneharu SAIGO ◽  
Yoshihiro KIKUSHIMA
Keyword(s):  
Torsional Vibration ◽  
Vibration Absorber ◽  
Wave Control
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