可控震源振动器平板多频响应分析

Analysis of multi-frequency response of vibroseis vibrator baseplate

高精度、宽频激发是可控震源的主要发展趋势。在工程应用中,可控震源振动器平板在不同扫描频率下的响应存在差异,导致可控震源在全频段的输出信号精度不一致,难以向宽频拓展,因此有必要开展振动器平板多频响应分析。首先,利用有限单元法,建立了KZ-28型可控震源振动器仿真模型,研究了振动器平板在不同频率下的动力学响应性能,得到了平板加速度、变形和接触力随着频率增加而增大的变化规律。其次,分析发现,平板的刚度不足是导致平板在不同频率下响应存在差异的根本原因,提高平板的刚度可以提升可控震源在全频段的输出信号品质。研究结果将为振动器平板的结构优化提供指导。

High precision and broadband excitation is the main development tendency of vibroseis.Through the engineering application,there are differences in the response of vibrator baseplate at different scanning frequency,which result in the output signal of vibroseis is inconsistent in the whole frequency and restrict the development of vibroseis.Therefore,it’s necessary to analyze multi-frequency response of vibrator baseplate.According to the basic theory of finite element method,the finite element model of KZ-28 vibroseis vibrator was established,the dynamics responses of vibrator baseplate at different frequency was carried out and response rule of vibrator baseplate was mastered.It was found by analysis that insufficient rigidity of vibrator baseplate was the most fundamental reason which brought about the different performance of vibrator baseplate at different frequency.This study has a positive effect for design and optimization of vibrator baseplate.