本文应用微分方程的定性方法，给出具有间隙动力系统产生自激振动的一个充分条件。
In this paper, the sufficient condition for self-excited oscillation of dynamic systems with gap is given by using qualitative method of differential equations.
研究了双幅激振自同步椭圆振动系统的同步性条件和同步状态稳定性条件。
In this paper, we discussed the synchronism conditions and the synchronous state stability condition of the self-synchronous ellipse vibrating system with dual amplitudes exciting.
对双电机实现自同步直线激振的进一步分析和推导，给出自同步原理和同步性条件；
The paper further analyses the mechanism of double motor linear excitation. This chapter establishes the principle of the realization of auto-synchronization and the condition of auto-synchronization.
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