Experimental investigations on seismic control of cable-stayed bridges using shape memory alloy self-centering dampers

2018 ◽  
Vol 25 (7) ◽  
pp. e2180 ◽  
Author(s):  
Peng Zhou ◽  
Min Liu ◽  
Hui Li ◽  
Gangbing Song
Keyword(s):  
Shape Memory Alloy ◽  
Shape Memory ◽  
Experimental Investigations ◽  
Seismic Control ◽  
Cable Stayed Bridges

Passive Seismic Control Using Shape Memory Alloy Springs

2006 ◽  
Author(s):  
Yoshitaka Yamashita ◽  
Arata Masuda ◽  
Akira Sone
Keyword(s):  
Shape Memory Alloy ◽  
Shape Memory ◽  
Shaking Table ◽  
Scale Model ◽  
Response Analysis ◽  
Acceleration Response ◽  
Restoring Force ◽  
Seismic Control ◽  
Seismic Force ◽  
Sma Spring

In this paper, seismic response analysis is made both experimentally and numerically for a passive isolation device with pseudoelastic shape memory alloy (SMA) spring as a restoring force component. Thanks to the material nonliniarity and the geometrical nonliniarity, the SMA spring used in the device has well-defined softening, or “force limiting”, property that can suppress the acceleration response of the superstructure by limiting the seismic force transmitted from the ground. To illustrate how the presented device can suppress the acceleration response under the prescribed level, shaking table tests of a reduced-scale model of uniaxial isolator are carried out with seismic inputs appropriately scaled both in time and in amplitude. Then, a Preisach model of the SMA spring is constructed for the purpose of design study, and verified by comparing the simulated seismic responses with the experimental ones.

scholarly journals Vibration control of a flexible rotor suspended by shape memory alloy wires

2018 ◽  
Vol 29 (11) ◽  
pp. 2309-2323 ◽  
Author(s):  
Marco Túlio Santana Alves ◽  
Valder Steffen ◽  
Marina Castro dos Santos ◽  
Marcelo Amorim Savi ◽  
Søren Enemark ◽  
...  
Keyword(s):  
Shape Memory Alloy ◽  
Shape Memory ◽  
Vibration Control ◽  
Thermomechanical Properties ◽  
Complete Characterization ◽  
Experimental Investigations ◽  
Present Contribution ◽  
Flexible Rotors ◽  
Suspension Stiffness ◽  
The One

The present contribution is devoted to the study of the influence of shape memory alloys on the dynamic behavior of flexible rotors. In this sense, a suspension composed by pseudoelastic shape memory alloy wires that are connected to a rotor-bearing test rig was designed. To evaluate the performance of the system, both numerical and experimental investigations are carried out. The suspension stiffness can vary, especially in the pseudoelastic region, so that this variation takes place per a hysteretic cycle denoting energy dissipation whenever the loading magnitude is sufficient to induce a phase transformation. The constitutive model used to describe the shape memory alloy behavior is a modified version of the Brinson model for the one-dimensional case. To provide all thermomechanical properties of shape memory alloy wire, a complete characterization process was performed. Due to numerical reasons, the size of the model of the rotating system was reduced. Finally, numerical and experimental results demonstrate the success of shape memory alloy applied to the suspension of rotating machines as an interesting alternative for vibration control.

Design of a Shape Memory Alloy Actuated Compliant Smart Structure: Elastica Approach

2009 ◽  
Vol 131 (6) ◽  
Author(s):  
M. Sreekumar ◽  
T. Nagarajan ◽  
M. Singaperumal
Keyword(s):  
Shape Memory Alloy ◽  
Shape Memory ◽  
Static Analysis ◽  
Iterative Algorithm ◽  
Relative Error ◽  
Structural Member ◽  
Smart Structure ◽  
Experimental Investigations ◽  
Spatial Mechanism ◽  
Safe Operating

Large displacement static analysis of a fully compliant spatial mechanism is presented here. This mechanism is made up of a superelastic nitinol pipe as its compliant structural member and actuated by three shape memory alloy (SMA) wires. The coupled effect of the force developed by the SMA actuation and the force required for elastica deflection is simplified by incorporating the geometric parameters of the mechanism using a deflection plane approach. An iterative algorithm with elliptical integration has been developed, which is suitable for a wider range of actual and arbitrary inputs. The solutions are obtained for the effect of one-wire and two-wire actuation methods. Results obtained from the deflection plane approach and simulation have been compared and found that the relative error is less than 1% within the safe operating range of 5% strain value recommended for SMA actuators. Based on the analytical and simulation inputs, the mechanism is miniaturized further with the aim of increasing its workspace and is fabricated for further experimental investigations.

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