可控震源低频谐波畸变压制技术

Low frequencies HDR(Harmonic Distortion Reduction)technology of seismic vibrators

可控震源由于机械和液压系统的结构限制,在低频时无法产生足够的基波出力能量。可控震源机械和液压系统在低频时又具有非常强的非线性,使其产生了巨大的谐波畸变,从而使得已经微小的基波出力变得更小。本文阐述如何通过箱体控制算法对可控震源在低频时的谐波畸变进行压制,主要目的是展示箱体控制算法可以有效地压制可控震源在低频的谐波畸变,从而提高可控震源基波出力,改善其信噪比。

Due to physical limitations in vibrator mechanical and hydraulic systems,the ground force output from a vibrator at low frequencies is limited.This limited ground force output is severely distorted by harmonic distortion such that the ground force in fundamental frequencies is reduced.This paper focused on reducing harmonic distortion through vibrator control algorithms to improve vibrator performance at low frequencies.The purpose was to show that with only vibrator control algorithms,the fundamental ground force from a vibrator can be noticeably improved at low frequencies.