An investigation on the stiffness variation in a synergistically configured SMA actuator

Nalini, D.; Ruth, D. Josephine Selvarani; Dhanalakshmi, K.

doi:10.1109/indicon.2016.7839029

Cited by 4 publications

(1 citation statement)

References 16 publications

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“…The relation between the minimum actuating temperature, captured via infrared images, and safe heating current and the temperature of the SMA wire is shown in Figure 9(a) and (b), respectively. The actuator response is obtained for 425 mA, 0.5 Hz sine input to depict the operation during cycling of heating and cooling phases, as shown in Figure 10, for both the operational modes (Nalini D. et al, 2016a and2016b). The responses of the VSLA for both the operating modes, corresponding to the range of activation, are presented as plots in Figure 11.…”

Section: Basic Performancementioning

confidence: 99%

Synergistically configured shape memory alloy for variable stiffness translational actuation

Nalini

Dhanalakshmi

2019

Journal of Intelligent Material Systems and Structures

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The structural composition of two elastic elements, shape memory alloy wire (active actuating element) and spring (the passive bias), offers variable stiffness actuation. Based on this principle, a variable stiffness linear actuator is conceptually designed and developed. It is electromechanical by nature, that is, it is electrically activated and creates translational/linear motion. The variable stiffness linear actuator engages shape memory alloy wire(s) along with a passive compression spring to work synergistically. The biasing element offers recovery force to the shape memory alloy wire as well as compliance to the whole structure. The synergistic configuration exhibits an aiding force, thereby allowing an actuation with large displacement and a wide range of stiffness. The actuator mechanism is implemented through parallel action and further proposes two different modes of operation: pull mode (i.e. the disc moving along a fixed shaft) and push mode (i.e. linear reciprocating motion of the pushrod). The shape memory alloy configured actuator mechanism is analysed theoretically; the working model of the variable stiffness linear actuator is developed and investigated experimentally. The results apprise that the variable stiffness linear actuator is capable of offering large displacement and in reproducing the stiffness profile for active compliance control applications.

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Section: Basic Performancementioning

confidence: 99%