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121.
Wilson JR 《Aerospace America》2003,41(2):34-38
The application of microelectromechanical systems (MEMS) to space flight is reviewed. The applications include use as microthrusters on mini-size and smaller satellites, in missile defense systems, and as propulsion systems for miniature unmanned aerial vehicles. 相似文献
122.
An analysis technique is presented which permits the designer to explore the start-up transient of a dc-to-dc converter when it is powered by a current-limited source. The current versus voltage characteristics of the source are superimposed upon those of the dc-to-dc converter. By noting the nature of the intersection of these curves in the voltage-current plane, we are able to predict whether or not the converter is able to start up while powering a specified load. 相似文献
123.
Wilson T.G. Lee F.C.Y. Burns W.W. Owen H.A. 《IEEE transactions on aerospace and electronic systems》1975,(2):238-244
It recently has been shown in the literature that many dc-to-squarewave parallel inverters which are widely used in power-conditioning applications can be grouped into one of two families. Each family is characterized by an equivalent RLC network. Based on this approach, a classification procedure is presented for self-oscillating parallel inverters which makes evident natural relationships which exist between various inverter configurations. By utilizing concepts from the basic theory of negative resistance oscillators and the principle of duality as applied to nonlinear networks, a chain of relationships is established which enables a methodical transfer of knowledge gained about one family of inverters to any of the other families in the classification array. 相似文献
124.
Wilson T.G. Whelan E.W. Rodriguez R. Dishman J.M. 《IEEE transactions on aerospace and electronic systems》1983,(3):413-427
A new way is given to describe the independent and dependent design variables of the power train of a dc-to-dc converter in terms of a multidimensional design-parameter space. These concepts provide a framework for examining the problem of design optimization of the power train, with particular emphasis on the maximization of converter efficiency. Numerous examples of important parameterspace surfaces illustrate some of the major relationships between core volume, switching frequency, and output power and between efficiency, ripple, and temperature rise of the energy-storage reactor. Also, the difference in performance between the continuous and discontinuous magnetomotive (MMF) force modes of operation is explored. 相似文献