关于地震检波器横向共振特性的理论分析

A THEORETICAL ANALYSIS ON THE CROSS RESONANCE OF GEOPHONES

重庆大学

为什么横向运动会引起检波器振子的轴向振动并产生电压输出?本文对此问题进行了理论分析,引入了悬挂振子的弹簧片的横—轴特性,阐明了横向运动通过弹簧片横—轴特性,可以诱发出轴向周期激励。正是在这种周期激励下,振子发生了轴向受迫振动,感生出电压输出。特别地,当振子处于横向共振时,它在轴向则呈现强烈的轴向受迫振动—假共振。

A theoretical analysis is made on the reason why the transversal motion which is perpendicular to the geophone axis can cause the oscillator to vibrate axially and generate an electric output. The cross-axis characteristics of spider spring suspending the geophone oscillator are introduced. Moreover, the fact that the transversal motion may bring out the axial excitation of periodic vibration by dint of the cross-axis characteristics is expounded.Under the act of excitation of periodic vibration, the forced vibration happens with the oscillator and as a consequence, an electric output is induced therefrom. Especially when the oscillator is in the cross resonance it presents a significantly forced axial vibration, the spurious resonance.