The effect of the resonant chamber is analyzed . during the experiment , fluid self - oscillation occurs under reasonable configuration and inlet waterpower parameter of resonant chamber , the intensity of the self - oscillation will be changed when the configuration and inlet waterpower parameters of the resonant chamber are changed 实验中发现在合适的结构参数和水力参数下，可以使流体产生自激振荡，当共振腔结构尺寸及进口流体的水力参数发生改变时，产生的自激振荡强弱也会随之改变。
First , we think periodicity and weakening surge of the nonlinear waveform is caused by self - excitation of the circuit . the electric field thresholds ( et ) and maintenance field ( es ) of lock - on are modulated by the ac electric field ; the nonlinear waveform became two main modes of trans - electron oscillator , namely delay polar domain mode and quenched dipole domain mode 指出非线性波形周期性的减幅振荡，是由于光电导开关所处电路自激振荡形成的交流场对偶极畴的阈值电场e _ t和维持电场e _ s进行控制，从而形成转移电子振荡器的两种主要工作模式：延迟偶极畴模式和猝灭偶极畴模式。
It will exert resistance and damping force to the torque motor armature , so that the dynamic performance , especially the stability , of flapper - nozzle servo - valve can be improved . the self - excited oscillations and noise can be removed . at the same time , as magnetic fluid has a higher magnetic permeability , the efficiency of torque motor magnetic circuit can be improved 由于磁流体具有的较大磁导率和较大的磁化强度,把磁流体添加到伺服阀力矩马达的工作气隙中,可提高伺服阀力矩马达的磁回路效率,增加伺服阀的阻尼,从而改善喷嘴挡板伺服阀的动态特性,抑制及消除其自激振荡和噪声。
For the same configuration resonance chamber , the intensity of the self - oscillation is changed by the waterpower parameters . when the pressure increases , self - oscillation intensity will increase . by applying the self - oscillation generated by the resonance chamber to the heat exchanger , and when the self - oscillation intensity achieves a certain degree , heat transfer will be enhanced 对于同一结构的共振腔，水力参数不同，产生的自激振荡强弱也不相同，随着压力的增加，自激振荡的强度也增加；将共振腔产生的自激振荡引入换热器后，当自激振荡达到一定程度的强度后，可以强化换热。
Output window is the core of the gyrotron , which speciality can decide the speciality of the gyrotron greatly . the major subjects of output window design for high power gyrotron are to reduce the reflection and absorption power in order to enhance the gyrotron ’ s stability and protect the output window 如果窗片的反射升高,在高功率情况下返回到高频系统的功率将显著上升,引起寄生模式在高频系统中自激振荡,从而降低回旋管的高频输出功率和模式纯度,乃至于使回旋管不能正常稳定工作。
The shearing layer is carried by the jet and the eddy is formed because of the instability and selective amplification of shearing layer which will propagate to the downstream . as the eddy impacts the impinging wall , a wave of pressure disturbance with certain frequency is induced . this wave then propagates to the upstream with high speed , and results in the overlap and amplification of the waves when the frequencies of them are close with each other 当前喷嘴流束中的不稳定扰动波在穿过腔内的剪切层时，剪切层对其有选择放大作用，形成涡环结构，剪切流动中涡环与碰撞壁撞击，在碰撞区域产生压力扰动波并向上游反射，在上游剪切层分离处诱发新的扰动的产生，当新扰动与原扰动匹配时，射流上游就被不断地受到周期性激励，腔内就产生流体自激振荡并在后喷嘴出口形成脉冲射流。
Furthermore , the fiber phase - conjugator has been used in ld - pumped solid - state laser system with four - pass configuration to suppress the self - oscillating ( so ) phenomena caused by amplified spontaneous emitting ( ase ) in laser amplifier . when using 200 m fiber , the energy of so has been successfully decreased from 12mj to below the precision of energy - detector 将光纤相位共轭镜应用于四通放大结构中，有效抑制了放大级中的放大自发辐射引起的自激振荡现象，使得自激振荡输出能量从12mj降低到能量计最小精度以下。
