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[[File:Self_excited_oscillation.svg.png|thumb|300px|自激振荡作为[[正反馈]]回路的图示。振荡器<math>V</math>产生一个反馈信号<math>B</math>。位于<math>R</math>的控制器使用这个信号来调制作用于振荡器的外部源<math>S</math>。如果源与振荡器的速度同相调制，则产生负阻尼导致振荡增大，直到受到[[非线性]]的限制。]]

[[File:Self_excited_oscillation.svg.png|thumb|300px|自激振荡作为[[正反馈]]回路的图示。振荡器<math>V</math>产生一个反馈信号<math>B</math>。位于<math>R</math>的控制器使用这个信号来调制作用于振荡器的外部源<math>S</math>。如果源与振荡器的速度同相调制，则产生负阻尼导致振荡增大，直至达到[[非线性]]的限制。]]

Self-oscillation is the generation and maintenance of a periodic motion by a source of power that lacks any corresponding periodicity.  The oscillator itself controls the phase with which the external power acts on it.  Self-oscillators are therefore distinct from forced and parametric resonators, in which the power that sustains the motion must be modulated externally.  In linear systems, self-oscillation appears as an instability associated with a negative damping term, which causes small perturbations to grow exponentially in amplitude.  This negative damping is due to a positive feedback between the oscillation and the modulation of the external source of power.  The amplitude and waveform of steady self-oscillations are determined by the nonlinear characteristics of the system.  Self-oscillations are important in physics, engineering, biology, and economics.

Self-oscillation is the generation and maintenance of a periodic motion by a source of power that lacks any corresponding periodicity.  The oscillator itself controls the phase with which the external power acts on it.  Self-oscillators are therefore distinct from forced and parametric resonators, in which the power that sustains the motion must be modulated externally.  In linear systems, self-oscillation appears as an instability associated with a negative damping term, which causes small perturbations to grow exponentially in amplitude.  This negative damping is due to a positive feedback between the oscillation and the modulation of the external source of power.  The amplitude and waveform of steady self-oscillations are determined by the nonlinear characteristics of the system.  Self-oscillations are important in physics, engineering, biology, and economics.

<font color="#ff8000">自激振荡 Self-oscillation</font>是指不外加任何激励信号时，自行产生恒稳和持续的振荡。如果在运算放大器的输入端不加任何激励信号，输出端仍然输出一定幅值和频率的输出信号。<ref>https://kknews.cc/news/j9em45l.html</ref>

<font color="#ff8000">自激振荡 Self-oscillation</font>是指不外加任何激励信号时，自行产生的恒稳且持续的振荡。如果在运算放大器的输入端不加任何激励信号，输出端仍然会出一定幅值和频率的输出信号。<ref>https://kknews.cc/news/j9em45l.html</ref>

振子本身控制着外部源作用于它的相位。因此，自激振荡器不同于受迫和参数共振器，后者维持运动的源必须由外部调制。在<font color="#ff8000">线性系统 linear systems</font>中，自激振荡表现为与负阻尼项相关的失稳，导致小扰动振幅呈指数增长。这种负阻尼是由于振荡和外部源调制之间的<font color="#ff8000">正反馈 positive feedback</font>。系统的非线性特性决定了系统稳态自激振荡的幅值和波形。自激振荡在物理学、工程学、生物学和经济学中都很重要。

自激振荡是由缺乏相应周期性的动力源产生并维持周期性运动。其中振子本身控制着作用于它的相位的外部源。因此，自激振荡器不同于受迫和参数共振器，后者维持运动的源必须由外部调制。在<font color="#ff8000">线性系统 linear systems</font>中，自激振荡表现为与负阻尼项相关的失稳，导致小扰动振幅呈指数增长。这种负阻尼是由于振荡和外部源调制之间的<font color="#ff8000">正反馈 positive feedback</font>。系统的非线性特性决定了系统稳态自激振荡的幅值和波形。自激振荡在物理学、工程学、生物学和经济学中都有着很重要的作用。