Dynamic modelling of a shape memory alloy adaptive tuned vibration absorber

2005 ◽  
Vol 280 (1-2) ◽  
pp. 211-234 ◽  
Author(s):  
K.A. Williams ◽  
G.T.-C. Chiu ◽  
R.J. Bernhard
Keyword(s):  
Shape Memory Alloy ◽  
Shape Memory ◽  
Dynamic Modelling ◽  
Vibration Absorber ◽  
Tuned Vibration Absorber

scholarly journals A tuned vibration absorber constituted of shape memory alloy wires for vibration reduction of platform structures: design and implementation

2018 ◽  
Vol 185 ◽  
pp. 00013
Author(s):  
Yun-Ting Liao ◽  
Jia-Hong Lin ◽  
Chun-Ying Lee
Keyword(s):  
Shape Memory Alloy ◽  
Shape Memory ◽  
High Efficiency ◽  
Vibration Reduction ◽  
Vibration Absorber ◽  
Practical Applications ◽  
Operation Conditions ◽  
Tunable Frequency ◽  
Six Degree Of Freedom ◽  
Tuned Vibration Absorber

Machinery can suffer from mechanical vibrations since resonance may be generated from time-varying external excitations under different operation conditions. These detrimental vibrations may significantly influence the device's performance, effectiveness and reliability in operation. In this paper, an innovative, simple and high-efficiency tuned vibration absorber (TVA) consisting of shape memory alloy (SMA) wires, which is referred to a wire-type tuned vibration absorber (WTVA), is proposed to reduce the induced vibration. Experiments are carried out using a six-degree-of-freedom platform which is designed to simulate the frame of precision machinery in practical applications. With the equivalent stiffness of SMA wires adjusted by the controlled electric current, the frequency tunability of WTVA can be achieved. When the natural frequency of WTVA tuned in with the disturbance frequency, the experimental results demonstrate that the efficiency in vibration reduction of the platform is drastically increased even with considerable weight difference between WTVA and the platform. Moreover, the tunable frequency span also increases greatly due to the new design of WTVA and the material characteristics of SMA wires.

Nonlinear control of a shape memory alloy adaptive tuned vibration absorber

2005 ◽  
Vol 288 (4-5) ◽  
pp. 1131-1155 ◽  
Author(s):  
Keith A. Williams ◽  
George T.-C. Chiu ◽  
Robert J. Bernhard
Keyword(s):  
Shape Memory Alloy ◽  
Nonlinear Control ◽  
Shape Memory ◽  
Vibration Absorber ◽  
Tuned Vibration Absorber

Studies on the damping mechanism of shape memory alloy-spring tuned vibration absorber attached to a multi-degree-of-freedom structure

2021 ◽  
pp. 107754632110185
Author(s):  
Zheng Lu ◽  
Kunjie Rong ◽  
Li Tian ◽  
Canxing Qiu ◽  
Jiang Du
Keyword(s):  
Shape Memory Alloy ◽  
Shape Memory ◽  
Seismic Waves ◽  
Numerical Models ◽  
Degree Of Freedom ◽  
Hysteretic Behavior ◽  
System Response ◽  
Vibration Absorber ◽  
Transmission Tower ◽  
Tuned Vibration Absorber

To mitigate the adverse structural responses, an improved version of the traditional tuned vibration absorber has been proposed based on the shape memory alloy spring, referred as the shape memory alloy-spring tuned vibration absorber. The finite element numerical models of the multi-degree-of-freedom structure (e.g., transmission tower) and shape memory alloy-spring tuned vibration absorber are developed by using the commercial software ANSYS, and the nonlinear behavior of the shape memory alloy spring is validated based on a previous experimental study. The damping mechanism of the shape memory alloy-spring tuned vibration absorber attached to a multi-degree-of-freedom structure under seismic excitations is investigated, and the nonlinear hysteretic behavior of the shape memory alloy spring is also discussed. The results show that the proposed damper has a two-stage damping mechanism, and its control performance is remarkable. Because the coupled system response is sensitive to the amplitude level, the optimal configuration of the shape memory alloy-spring tuned vibration absorber can be obtained by parametric analysis. Particularly, because of the nonlinear target energy transfer and transient resonance capture mechanism, the shape memory alloy-spring tuned vibration absorber exhibits stable control ability under different seismic waves, indicating a good stability in vibration control of a multi-degree-of-freedom system.

Stability Analysis of a Shape Memory Alloy Adaptive Tuned Vibration Absorber Under PI Control With Anti-Windup

2001 ◽  
Author(s):  
Keith A. Williams ◽  
George Chiu ◽  
Robert Bernhard
Keyword(s):  
Stability Analysis ◽  
Shape Memory Alloy ◽  
Shape Memory ◽  
Control Algorithm ◽  
Relative Phase ◽  
Vibration Absorber ◽  
Primary System ◽  
Structural Elements ◽  
Integral Control ◽  
Tuned Vibration Absorber

Abstract This paper presents a stability analysis of a continuously controlled adaptive tuned vibration absorber (ATVA) incorporating shape memory alloy (SMA) structural elements to realize attenuation of the vibration of a primary system subject to uncertain tonal excitation. The objective is for the SMA ATVA stiffness to be adapted such that a relative phase angle of −90° is achieved between the vibration of the SMA ATVA and the primary mass. The Lyapunov-based stability analysis indicates that the system is stable under proportional-plus-integral control across the operating range of the SMA ATVA when an integral reset is included in the control algorithm. The integral reset also substantially improves the performance of the system when compared to the original PI controller without reset.

Experimental Studies on Dynamic Vibration Absorber using Shape Memory Alloy (NiTi) Springs

2011 ◽  
Author(s):  
V. Raj Kumar ◽  
M. B. Bharathi Raj Kumar ◽  
M. Senthil Kumar ◽  
P. Predeep ◽  
Mrinal Thakur ◽  
...  
Keyword(s):  
Shape Memory Alloy ◽  
Shape Memory ◽  
Experimental Studies ◽  
Vibration Absorber ◽  
Dynamic Vibration Absorber ◽  
Dynamic Vibration

scholarly journals DYANMIC ANALYSIS OF SHAPE MEMORY ALLOY OSCILLATORS IN ACTIVE SUSPENSION SYSTEM

2021 ◽  
Vol 21 (1) ◽  
pp. 15-25
Author(s):  
Rusul Saad Ahmed ◽  
Qasim Abaas Atiyah ◽  
Imad Abdlhussein Abdulsahib
Keyword(s):  
Shape Memory Alloy ◽  
Shape Memory ◽  
Vibration Control ◽  
Smart Materials ◽  
Original System ◽  
Vibration Absorber ◽  
Dynamic Vibration Absorber ◽  
Temperature Variations ◽  
Dynamic Vibration ◽  
Experimental Apparatus

Smart materials have a growing technological importance due to their unique thermomechanical characteristics. Shape memory alloys belong to this class of materials being easy to manufacture, relatively lightweight, and able to produce high forces or displacements with low power consumption. These aspects could be exploited in different applications including vibration control. A dynamic vibration absorber (DVA) can be used as an effective vibration control device. It is essentially a secondary mass, attached to an original system via a spring and damper. The natural frequency of the DVA is tuned such that it coincides with the frequency of unwanted vibration in the original system. This work aims to develop a dynamic vibration absorber with the help of shape memory alloy (SMA) springs in order to attenuate the vibration for a range of excitation frequencies. The experimental apparatus consisted of low-friction cars free to move in a rail. A shaker that provides harmonic forcing excites the system. Special attention is dedicated to the analysis of vibration reduction that can be achieved by considering different approaches exploiting temperature variations promoted either by electric current changes or by vibration absorber techniques. The results established that adaptability due to temperature variations is defined by modulus of stiffness

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