摘要
可控震源产生信号的可控性以及其安全环保、成本低的优点使其被广泛应用于地震勘探中.微型可控震源以其轻便,更易于适应复杂地形的优点而得到越来越多的重视.震源与大地之间的耦合通常会导致震源的输出力信号出现谐波失真.本文采用有限单元法,对一个微型可控震源设计模型进行了模态分析与瞬态响应分析,得到了其在100～200Hz范围内正弦载荷激励下的系统响应,并进行了谐波失真分析.
As the signal generated by vibroseis is controllable as well as its safety, environmental friendly and low cost, the vibroseis is widely used for seismic exploration. Due to its portability, the micro-vibroseis is more adaptable to complex terrain and it is used increasingly. The coupling between the vibroseis and the earth changes will lead to signal harmonic distortion. In this paper, modal analysis and transient response analysis under sinusoidal excitation load for a designed micro-vibroseis model are conducted within 100--200 Hz frequency range. The harmonic distortion analysis results are obtained finally, which demonstrates the designed micro-vibroseis structure meets the requirements of reducing the harmonic distortion.
出处
《物探装备》
2014年第2期91-95,共5页
Equipment for Geophysical Prospecting
关键词
可控震源
模态
耦合
谐波失真
vibroseis, model, coupling, harmonic-distortion
