AHV-364震源出现压力过载原因分析

Troubleshooting for P overload of AHV-364 vibroseis

震源在扫描时,地表的物理特性影响震源性能,共振频率后,随着扫描频率变大,平板出力与重锤出力相位差也变大。当接近140°时,平板出力明显抵消重锤出力,震源出力变小。为了弥补平板出力对震源出力的抵消作用,需要更大的液压出力,系统工作接近极限,最终会达到系统的极限,出现各种过载。本文结合沙特77队出现的P过载现象,分析了P过载的原因。

The baseplate and coupled ground become one system when vibrator sweep,the dynamic motion of this system will significantly impact vibrators performances to make the frequency increase,the phase shift between baseplate acceleration and mass acceleration signals increase.If the sweep frequency goes above the resonant frequency,the baseplate force attempts to cancel the reaction mass force,this leads to the fact that vibrator hydraulic system must produce more force to compensate for the force cancelled,eventually,the hydraulic system limitations will be reached,then we will see P overload,sometimes the vibrator force will decline.In this paper,the P overload phenomenon of the Saudi 77 team is combined to analyze the reasons and solutions.