Transactions of Nanjing University of Aeronautics & Astronautics
Design and Analysis of a Thermally Insulating and Heating Scheme for Piezoelectric Stack Actuators Used in the Cryogenic Environment
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Abstract:
In cryogenic wind tunnel tests， piezoelectric stacks are adopted to realize the vibration control of the cantilever sting. However， the free stroke and blocking force of the piezoelectric stack would decrease dramatically as the temperature decreases. This paper proposes a convenient and effective warming structure for the piezoelectric stack， which could keep it working at operating temperatures when the ambient temperature drops. The piezoelectric stack actuator is wrapped with the heating film， and this resulting assembly is then wrapped with the aerogel material for thermal insulation. Both ends of the piezoelectric stack actuator make direct contact with the payload structure. Both one-dimensional and two-dimensional theoretical analyses of the heating conduction problem of the piezoelectric stack actuator are conducted. These analyses results are compared with those of the finite element simulation analysis. The finite element method results show a good consistency with the two-dimensional theoretical results， and a slight deviation of only 0.91 K is observed， indicating its potential for protecting piezoelectric stacks at low temperatures.
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This work was supported by the National Natural Science Foundation of China （No.11872207）， Aeronautical Science Foundation of China （No.20180952007）， Foundation of National Key Laboratory on Ship Vibration and Noise （No.614220400307）， Natural Science Foundation of Jiangsu Province （No.BK20200413）， and the Priority Academic Program Development of Jiangsu Higher Education Institutions （PAPD）.
Clc Number:
TB381
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