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논문 기본 정보

자료유형
학술저널
저자정보
Enemark, Soren (Technical University of Denmark, Department of Mechanical Engineering) Savi, Marcelo A. (Universidade Federal do Rio de Janeiro, COPPE-Department of Mechanical Engineering) Santos, Ilmar F. (Technical University of Denmark, Department of Mechanical Engineering)
저널정보
테크노프레스 Smart structures and systems Smart structures and systems 제15권 제6호
발행연도
2015.1
수록면
1,521 - 1,542 (22page)

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The use of shape memory alloys (SMAs) in dynamical systems has an increasing importance in engineering especially due to their capacity to provide vibration reductions. In this regard, experimental tests are essential in order to show all potentialities of this kind of systems. In this work, SMA springs are incorporated in a dynamical system that consists of a one degree of freedom oscillator connected to a linear spring and a mass, which is also connected to the SMA spring. Two types of springs are investigated defining two distinct systems: a pseudoelastic and a shape memory system. The characterisation of the springs is evaluated by considering differential calorimetry scanning tests and also force-displacement tests at different temperatures. Free and forced vibration experiments are made in order to investigate the dynamical behaviour of the systems. For both systems, it is observed the capability of changing the equilibrium position due to phase transformations leading to hysteretic behaviour, or due to temperature changes which also induce phase transformations and therefore, change in stiffness. Both situations are investigated by promoting temperature changes and also pre-tension of the springs. This article shows several experimental tests that allow one to obtain a general comprehension of the dynamical behaviour of SMA systems. Results show the general thermo-mechanical behaviour of SMA dynamical systems and the obtained conclusions can be applied in distinct situations as in rotor-bearing systems.

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