摘要
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.
在低温风洞试验中,通常采用压电叠堆实现悬臂支杆的振动控制。然而,随着温度的降低,压电叠堆的最大自由位移和最大输出力将显著降低。本文提出了一种方便有效的压电堆加热结构方案,当环境温度下降时,该结构可以使压电堆在工作温度下工作。首先,采用聚酰亚胺加热膜包裹压电叠堆,然后在外部用气凝胶材料包裹以实现隔热目的。压电叠堆的两端与有效载荷结构直接接触。接着,对压电叠堆的热传导问题进行了一维和二维理论分析。最后,采用有限元方法验证了理论分析的结果。有限元计算结果与二维理论结果具有良好的一致性,仅观察到0.91 K的微小偏差,显示了本方案在低温下保护压电叠堆的潜力。
基金
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)
the Priority Academic Program Development of Jiangsu Higher Education Institutions(PAPD)。
