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基于液压式可控震源的线性模型在电磁式可控震源的应用上已不再适合,故电磁式可控震源-大地耦合模型研究对实现有限激励能量向大地的最佳传输至关重要.由于可控震源基板中含有大量高频谐波,在耦合模型中引入非线性恢复力,并通过用多尺度法对系统进行了非线性振动分析.对振动过程中的超谐共振现象为能量传输过程中谐波的产生给出了合理的解释,并为可控震源地震勘探中互相关参考信号的选取提出了改进方案,通过野外实验,取得了良好的应用效果.
The linear model based on hydraulic vibrator is no longer suitable for the application of electromagnetic vibrator, so the study of electromagnetic vibrator-geodetic coupling model is very important for the optimal transmission of finite excitation energy to the earth. A large number of high-frequency harmonics are contained in the substrate of the vibroseis, and nonlinear restoring force is introduced into the coupling model, and nonlinear vibration analysis is performed by using the multi-scale method. The super-harmonic resonance phenomenon in the vibration process is the energy transfer process This paper gives a reasonable explanation for the generation of harmonics and proposes an improved scheme for the selection of cross-correlation reference signals in seismic exploration of vibroseis. The field experiment has achieved good results.