瞬態(tài)激勵下圓盤軸向電磁能量的流動規(guī)律
ELECTROMAGNETIC ENERGY FLOW PATTERN ON THE AXIS OF A CIRCULAR DISK BY TRANSIENT EXCITATION
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摘要: 本文給出了在瞬態(tài)均勻電流分布激勵下，圓盤軸線上能量衰減的精確解。當激勵波形選為矩形脈沖,且 a/c 時，在靠近源的區(qū)域內存在一個能量上升階段，在達到最大值之后能量開始慢衰減，到無窮遠處時即成為球面波衰減；無衰減區(qū)域是不存在的；能量上升階段的范圍決定于天線的尺寸以及脈沖的寬度。文中還給出了單頻信號激勵下，軸線附近的功率流線管。單頻解表明：在靠近源的區(qū)域內存在一振蕩區(qū)域，其幅度呈上升趨勢，與Silver在1949年得出的結論不同。最后對時域能最上升段進行了解釋，并對電磁導彈的一些問題進行了討論。Abstract: The exact energy flow pattern on the axis of a circular disk by transient excitation is presented. It is shown that non-decaying region does not appear when the source is chosen to be a rectangular pulse, on the contrary, there exists a uprising region on the axis when the width of the pulse is less than a/c. After reaching its maximum value, the energy decays slowly until the law of r-2 is met. The scale of the uprising region is dependent upon the size of the antenna and the width of the pulse. The energy flow line tube excited by a harmonic wave is also given. It is also shown that there is a oscillatory region near the source, the amplitude is also uprising, which is quite different compared with the conclusion drawn by S. Silver (1949). Finally, the phenomenon of energy uprising in time domain is explained and some problems about the electromagnetic missiles are also expounded.
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