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首页> 外文会议>AIAA/ASME Adaptive Structures Forum, Apr 21-22, 1994, Hilton Head, SC >ADAPTIVE ELECTROSTATIC STRUCTURES: A FUNDAMENTAL STUDY OF THE ELECTROSTATIC OSCILLATOR
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ADAPTIVE ELECTROSTATIC STRUCTURES: A FUNDAMENTAL STUDY OF THE ELECTROSTATIC OSCILLATOR

机译：自适应静电结构：静电振荡器的基础研究

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Electrostatic structures are a new class of adaptive structures in which the structure is imbedded with electrical charge over its domain, which in turn is controlled by an external electrical field. The external electrical field is obtained by a distribution of electrodes, each charged to a prescribed potential. The result is a structure that can change its shape. Fundamental experiments in this area accurately predicted equilibrium positions within errors on the order of 0.16% (Ref. 1, 2) and predicted electrostatic frequencies of oscillation to within errors of 10-20%. While the prediction of the equilibrium positions is sufficiently accurate to validate the prediction techniques employed, the prediction of the electrostatic frequencies was insufficiently accurate and raised questions regarding the prediction method employed and several of the associated assumptions. This paper will describe an experiment and prediction method specifically designed to resolve the inaccuracy of the predicted natural frequency obtained in Refs. 1 and 2. In the process, this paper will highlight fundamental issues in predictive modeling of adaptive electrostatic structures. The field of electrostatics dates back to the classical works of Coloumb and since then has been honored by many historic works. Likewise, the field of mechanics dates back just as far, and within its domain contains a great many classical works. In contrast, the coupling of the two fields is of recent vintage. Coupled problems of electrostatics and mechanics are found in contemporary engineering applications. Examples of these include electrostatic speakers (Refs. 3 and 4), scientific instruments (Refs. 5 and 6) and space-based antennas (Refs. 7 and 8). One way or another, these electrostatic dynamical systems can be regarded as complex electrostatic oscillators. This paper develops an electrostatic oscillator experiment, predicts its behavior and compares the predictions with the measurements. The electrostatic oscillator experiment presented here will isolate the electrical forces and balance to zero the mechanical forces so that the frequency of the oscillator is due to the electrostatic effects alone. Spherical geometries were selected for the charged surfaces so that the predictions can be made using the method of images (Ref. 9). Furthermore, the parameters were selected to yield a frequency in a range that is easily observed (and measured).
机译：静电结构是一类新的自适应结构，其中该结构在其范围内嵌入电荷，而电荷又由外部电场控制。外部电场是通过分布电极而获得的，每个电极都充电到规定的电位。结果是可以改变其形状的结构。该领域的基础实验准确地预测了误差在0.16％左右的平衡位置（参考文献1、2），并且将振荡的静电频率预测为误差在10-20％之内。尽管平衡位置的预测足够准确以验证所采用的预测技术，但静电频率的预测仍不够准确，因此对所采用的预测方法和一些相关假设提出了疑问。本文将介绍专门设计用于解决Refs中获得的预测自然频率不准确的实验和预测方法。 1和2。在此过程中，本文将重点介绍自适应静电结构的预测建模中的基本问题。静电学领域可以追溯到Coloumb的经典作品，从那时起，它就被许多历史悠久的作品所推崇。同样，力学领域的历史可以追溯到很远，并且在其领域内包含着许多经典作品。相反，这两个领域的结合是近代的。在当代工程应用中发现了静电和力学的耦合问题。这些示例包括静电扬声器（参考文献3和4），科学仪器（参考文献5和6）和天基天线（参考文献7和8）。这些静电动力系统以一种方式或另一种方式可以视为复杂的静电振荡器。本文开发了一种静电振荡器实验，可以预测其行为，并将预测结果与测量结果进行比较。此处介绍的静电振荡器实验将隔离电力并将机械力平衡为零，从而使振荡器的频率仅归因于静电作用。为带电表面选择了球形几何形状，以便可以使用图像方法进行预测（参考文献9）。此外，选择参数以产生易于观察（和测量）的频率范围。

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