Research on vibration suppression effect of shape memory alloy on thin-walled structure

2021 ◽  
Author(s):  
Chuanliang Shen ◽  
Chengfeng Zheng ◽  
Jing Yu ◽  
Xiaodong Xu ◽  
Shengnan Li ◽  
...  
Keyword(s):  
Shape Memory Alloy ◽  
Shape Memory ◽  
Vibration Suppression ◽  
Suppression Effect ◽  
Thin Walled

Design and control of adaptive vibration absorber for multimode structure

2019 ◽  
Vol 30 (7) ◽  
pp. 1043-1052 ◽  
Author(s):  
Jin-Siang Shaw ◽  
Cheng-An Wang
Keyword(s):  
Shape Memory Alloy ◽  
Shape Memory ◽  
Fuzzy Logic Controller ◽  
Vibration Suppression ◽  
Experimental Testing ◽  
Vibration Absorber ◽  
Vibration Absorbers ◽  
Vibration Absorption ◽  
Resonant Modes ◽  
And Control

In this study, we used two tunable vibration absorbers composed of shape memory alloy to reduce vibration of a platform structure. The natural frequency of the shape memory alloy absorber can be tuned online using a fuzzy logic controller to change the axial force of the shape memory alloy wires through phase transformation. In addition, we employed the finite element method to analyze the dynamic characteristics of the multimode platform structure and to evaluate the effectiveness of the shape memory alloy vibration absorber in terms of platform vibration attenuation. Experimental testing of the platform structure was conducted to verify its modal characteristics. By setting the two shape memory alloy tunable vibration absorbers on two adjacent sides of the platform at 90 degrees to each other and offset from the platform’s center axes, it is shown that all six modes can be covered for vibration absorption. The experiments show that the vibration due to all six mode modal excitations can be attenuated by more than 7.49 dB using the shape memory alloy tunable vibration absorber. Specifically, at the fourth, fifth, and sixth resonant modes, an average of 16.68 dB vibration suppression is observed. Overall, an average of 12.69 dB vibration suppression is achieved for resonant excitation of the entire platform structure when using the designed shape memory alloy tunable vibration absorber.

Influence of Contact Positioning of Pivot Support on Machining Vibration

2021 ◽  
Author(s):  
Kotaro Mori ◽  
Iwao Yamaji ◽  
Daisuke Kono ◽  
Atsushi Matsubara ◽  
Takehiro Ishida ◽  
...  
Keyword(s):  
Rigid Body ◽  
Flat Plate ◽  
Vibration Suppression ◽  
Suppression Effect ◽  
Damping Effect ◽  
Machining Test ◽  
Cylindrical Workpiece ◽  
Support Mechanisms ◽  
Thin Walled ◽  
Body Support

Abstract The authors have studied support mechanisms for the machining of thin-walled workpieces. Previous studies have shown that the newly proposed pivot support has a vibration suppression effect on flat plate workpieces. This report clarifies the guideline for determining the placement interval for deploying this support on a cylindrical workpiece. Also, a machining test was conducted to compare the damping effect of pivot support with that of conventional rigid body support. As a result, it was found that the pivot support has an equivalent vibration suppression effect as the conventional support has. By using the proposed support, installation can be simplified while maintaining the damping effect.

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