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Stability criteria for switching of a bistable microactuator
A study on the stability characteristics of a snap-action bistable microactuator that uses residual stress tension for buckling and employs bimorph for switching is presented. The stability analysis is based on the study of heat transfer and thermal buckling. This analysis is to characterize the device more completely and to help developing design and operational guidelines of the device. A snap-through model of the microactuator based on structural mechanics is built. A governing equation of the structural stability criterion is formulated. The equation reveals that the compensation for the mean elongation of the buckling cantilever during switching is essential to achieve the snap-through action. Functional relationship between heating requirement and initial deflection is obtained and serves as an important guideline for operation and future design. The necessary heating time and applied voltage on the device can be estimated from the analysis. We provide heating specifications of the tension-band anchor for optimum device operation. The analysis shows that the applied voltage on the tension-band anchor should be at least half of that on the buckling cantilever and that the heating time for the tension-band anchor can be reduced further from the previous experiment. The relation among applied voltage, heating time, and initial deflection are presented in a 3D plot. Experimental verification of the obtained stability criteria is also provided.
Stability criteria for switching of a bistable microactuator
A study on the stability characteristics of a snap-action bistable microactuator that uses residual stress tension for buckling and employs bimorph for switching is presented. The stability analysis is based on the study of heat transfer and thermal buckling. This analysis is to characterize the device more completely and to help developing design and operational guidelines of the device. A snap-through model of the microactuator based on structural mechanics is built. A governing equation of the structural stability criterion is formulated. The equation reveals that the compensation for the mean elongation of the buckling cantilever during switching is essential to achieve the snap-through action. Functional relationship between heating requirement and initial deflection is obtained and serves as an important guideline for operation and future design. The necessary heating time and applied voltage on the device can be estimated from the analysis. We provide heating specifications of the tension-band anchor for optimum device operation. The analysis shows that the applied voltage on the tension-band anchor should be at least half of that on the buckling cantilever and that the heating time for the tension-band anchor can be reduced further from the previous experiment. The relation among applied voltage, heating time, and initial deflection are presented in a 3D plot. Experimental verification of the obtained stability criteria is also provided.
Stability criteria for switching of a bistable microactuator
Stabilitätskriterien für das Umschalten eines bistabilen Mikrostellantriebes
Yang, Y.J. (author) / Kim, C.J. (author)
1995
10 Seiten, 15 Bilder, 8 Quellen
Conference paper
English
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