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首页> 外文期刊>American journal of physics >RIPPLES IN THE ENERGY OF A DAMPED OSCILLATOR - THE EXPERIMENTAL POINT OF VIEW
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RIPPLES IN THE ENERGY OF A DAMPED OSCILLATOR - THE EXPERIMENTAL POINT OF VIEW

机译：阻尼振荡器的能量波动-实验观点

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摘要

An irreversible transformation of mechanical into thermal energy takes place during the motion of a damped harmonic oscillator, with the result that the level of the total mechanical energy of the system, as a first approximation, decays exponentially with time. A detailed description of this decrease, however, is not usually supplied in textbooks of classical mechanics or general physics. As Karlow has recently pointed out, the negative-exponential decay is modulated by a sequence of energy ripples, owing to the dissipation rate being not constant during the motion. Up to now, the analysis of this behavior has been based only on theoretical considerations; in this work we present the corresponding experimental evidence based on a couple of laboratory demonstrations that use an electrical RLC circuit and a hydrodynamically damped mechanical pendulum. (C) 1996 American Association of Physics Teachers. [References: 5]
机译：机械能到热能的不可逆转换在阻尼谐波振荡器的运动过程中发生，结果，系统的总机械能的水平（作为一阶近似值）随时间呈指数衰减。但是，这种减少的详细描述通常不会在古典力学或普通物理学的教科书中提供。正如Karlow最近指出的那样，由于运动过程中的耗散率不是恒定的，因此负指数衰减由一系列能量波动调制。到目前为止，对该行为的分析仅基于理论上的考虑。在这项工作中，我们基于一些使用电子RLC电路和流体动力阻尼机械摆的实验室演示，提供了相应的实验证据。 （C）1996年美国物理教师协会。 [参考：5]

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