Design and modeling of a self-sufficient shape-memory-actuator

André Bucht; Tom Junker; Kenny Pagel; Welf-Guntram Drossel; Reimund Neugebauer

doi:10.1117/12.880373

27 April 2011 Design and modeling of a self-sufficient shape-memory-actuator

André Bucht, Tom Junker, Kenny Pagel, Welf-Guntram Drossel, Reimund Neugebauer

Proceedings Volume 7977, Active and Passive Smart Structures and Integrated Systems 2011; 79772H (2011) https://doi.org/10.1117/12.880373
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2011, San Diego, California, United States

Abstract

In machine tools several time and position varying heat sources causes complex temperature distributions. The resulting problems are varying thermal deformations which cause a loss of accuracy as well as non optimal drive conditions. An option to deal with that issue is to use structure integrated SM-actuators which use the thermal energy accumulated by machining processes to yield an actuator displacement. That creates a structure inherent control loop. There the shape-memory- elements work as sensing element as well as actuation element. The plant is defined by the thermal and mechanical behaviour of the surrounding structure. Because of the closed loop operation mode, the mechanical design has to deal with questions of stability and parameter adjustment in a control sense. In contrast to common control arrangements this issues can only be influenced by designing the actuator and the structure. To investigate this approach a test bench has been designed. The heat is yielded by a clutch and directed through the structure to the shape memory element. The force and displacement of the actuator are therefore driven directly by process heat. This paper presents a broad mechanical design approach of the test bench as well as the design of the SM-actuator. To investigate the thermo-mechanical behaviour of the structure-integrated actuator, a model of the test bench has been developed. The model covers the thermal behaviour of the test bench as well as the thermo-mechanical couplings of the shape memory actuator. The model has been validated by comprehensive measurements.

Citation Download Citation

André Bucht, Tom Junker, Kenny Pagel, Welf-Guntram Drossel, and Reimund Neugebauer "Design and modeling of a self-sufficient shape-memory-actuator", Proc. SPIE 7977, Active and Passive Smart Structures and Integrated Systems 2011, 79772H (27 April 2011); https://doi.org/10.1117/12.880373

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