scholarly journals Dynamic Characteristics of Hanging Truss Having Shape Memory Alloy Wires

2017 ◽  
Vol 7 (2) ◽  
pp. 6 ◽  
Author(s):  
Xuan Zhang ◽  
Kazuyuki Hanahara ◽  
Yukio Tada
Keyword(s):  
Shape Memory Alloy ◽  
Shape Memory ◽  
Dynamic Characteristics ◽  
Dynamic Problem ◽  
Vibration Isolation ◽  
Mechanical Characteristics ◽  
Structural System ◽  
Vibration Attenuation ◽  
Calculation Process ◽  
Absorption Characteristics

In this study, we discuss the dynamics of a type of hanging truss structural system consisting of rigid and wire members, part of which are SMA (shape memory alloy) wires. This kind of truss structure has the capability of vibration isolation and absorption. Characteristics of zero compressive stiffness of wire members, SMA wire members and hanging configuration of the structure itself contribute to the effect of vibration isolation. The hysteretic loop of SMA wires plays a significant role in vibration attenuation. Mathematical models for this kind of dynamic problem are developed. Calculation process is introduced to take into account the mechanical characteristics of SMA and wire members. Dynamic characteristics are discussed; simultaneously, the effects of vibration isolation and attenuation have been confirmed. On the basis of the numerical calculations, advantages of combinations of various types of wire members, including the truss units having no bracing wires have been demonstrated. 

Optimal design of a hanging truss with shape memory alloy wires

2020 ◽  
Vol 44 (1) ◽  
pp. 95-107
Author(s):  
Xuan Zhang ◽  
Kazuyuki Hanahara ◽  
Yukio Tada ◽  
Zhiyong Pei ◽  
Zhe Li ◽  
...  
Keyword(s):  
Shape Memory Alloy ◽  
Shape Memory ◽  
Vibration Amplitude ◽  
Vibration Isolation ◽  
Point Of View ◽  
Optimal Solutions ◽  
Sectional Area ◽  
Structural System ◽  
Column Type ◽  
Transmission Reduction

In this study, we discuss the dynamic problem of a column-type hanging truss structural system with pseudo-elastic shape memory alloy (SMA) bracing wires. In the case where the sectional area values of the bracing SMA wire members are small enough to be negligible, it is close to the situation where there are no braces. In the case where the sectional area values of the bracing SMA wire members are large enough not to be negligible, the vibration amplitude of the peripheral end apparatus is suppressed from the deformation point of view. In addition, energy attenuation efficiency is improved with larger sectional area values because of the hysteretic characteristic of SMA. Small sectional area values of the bracing SMA wire members near the support ceiling or peripheral end are beneficial to vibration transmission reduction. These findings indicate that the placement and sectional area values of SMA wire members are both significant from the viewpoint of suppression of influence of the support ceiling vibration of the hanging truss. In this study, we obtain the optimal sectional area values of the SMA wire bracing members for the objectives of vibration isolation and attenuation. We discuss influences of different vibration conditions on the optimal solutions.

Sub-Structure Pseudo-Dynamic Response Test of a Pseudo-Elastic Bracing System Made of Shape Memory Alloy

2005 ◽  
Vol 297-300 ◽  
pp. 628-634 ◽  
Author(s):  
Kenichi Ohi ◽  
Jae Hyouk Choi
Keyword(s):  
Shape Memory Alloy ◽  
Shape Memory ◽  
Original Position ◽  
Small Displacement ◽  
Structural System ◽  
Dynamic Tests ◽  
System A ◽  
Hysteretic Damper ◽  
Bracing System ◽  
Fail Safe

This paper deals with shape memory alloy. As a first step to assess the applicability of this kind of alloy in a structural system, a tension bar made of this kind of alloy that exhibits pseudo-elasticity at room temperature is used herein as a passive bracing system. This paper describes sub-structure pseudo-dynamic tests on pseudo-elastic bracing system with hysteretic damper. A pseudo-elastic bracing system is better to be used with other hysteretic elements such as a hysteretic damper. A damper provides energy dissipation within small displacement levels, and a pseudo-elastic bracing system works in turn as a back-up/fail-safe system when an accidental failure of damper or damper interface occurs, and also it helps to pull back the structure to the original position by uninstalling the damper after earthquake.

Mechanical characteristics of the shape memory alloy driver focusing on quick replacement technology for fusion devices

1991 ◽  
Vol 179-181 ◽  
pp. 1115-1118 ◽  
Author(s):  
M. Nishikawa ◽  
M. Kawai ◽  
T. Yokoyama ◽  
T. Hoshiya ◽  
M. Naganuma ◽  
...  
Keyword(s):  
Shape Memory Alloy ◽  
Shape Memory ◽  
Mechanical Characteristics

Theoretical analysis on the adaptive vibration attenuation of a fixed-fixed beam realized by a piezo-shape memory alloy ferrule

2019 ◽  
Vol 30 (14) ◽  
pp. 2079-2090 ◽  
Author(s):  
Longfei Wang ◽  
Ying Wu ◽  
Zishun Liu
Keyword(s):  
Shape Memory Alloy ◽  
Shape Memory ◽  
Self Regulation ◽  
Nonlinear Dynamic Response ◽  
Adaptive Property ◽  
Proposed Model ◽  
Vibration Attenuation ◽  
The Stability ◽  
System Characteristics ◽  
Fixed Beam

In this article, the vibration attenuation of a fixed-fixed beam with a piezo-shape memory alloy ferrule is theoretically investigated. First, a dynamic model of the beam with a piezo-shape memory alloy ferrule is established, and the nonlinear dynamic response of the model is numerically analysed. The results show that the stability of the beam structure can be improved adaptively through self-regulation of the stiffness of the piezo-shape memory alloy ferrule undergoing external excitations. The effects of some internal system characteristics, such as the ferrule dimensions as well as the initial ferrule temperatures and boundary conditions, on the vibration attenuation of the beam are discussed. The stability of the proposed model under different external factors, including damping and external excitations, is also investigated. Compared with an aluminium ferrule, the present ferrule is better at the suppressing vibrations of the beam, and its adaptive property avoids the structural resonances for bigger ferrule sizes, making it more intelligent, efficient and convenient.

VIBRATION ATTENUATION IN A FLEXIBLE ROTOR USING A SHAPE MEMORY ALLOY

2019 ◽  
Author(s):  
Bárbara Nara Teixeira Cunha ◽  
Orlando Tomaz da Silva Neto ◽  
Aldemir Ap Cavalini Jr ◽  
Valder Steffen Jr ◽  
Marco Túlio Alves
Keyword(s):  
Shape Memory Alloy ◽  
Shape Memory ◽  
Flexible Rotor ◽  
Vibration Attenuation
Sign in / Sign up

Export Citation Format

Share Document