摘要
针对偏心轮式可控震源低频激振能量低的问题,基于震源激振力与偏心轮旋转加速度、驱动扭矩的关系,构建了双偏心体非对称旋转模型,并在相位触发机制下实现“动能累积-定向释放”冲击机制,提出一种偏心轮旋转角速度动态变化的瞬时冲击激振优化方法。经参数建模和仿真实验,与常规激振模式进行对比,结果表明:(1)提出的冲击激振模式产生的波形呈连续脉冲式特征,在低频2~5 Hz产生的幅值增强明显,尤其在2 Hz时产生的能量提升幅度超过20%;(2)与恒定频率模式相比,冲击激振模式产生的自相关波形主峰更尖锐、旁瓣衰减更快,在2 Hz时子波压缩率提升30%。该方法能够有效提升了偏心轮式可控震源的低频激振性能,为偏心轮式可控震源技术的发展提供新的设计思路和优化路径。
To address the problem of low excitation energy of eccentric-wheel-type controlled seismic vibrator at low frequencies,a dual-eccentric asymmetric rotation model is constructed based on the relationship among excitation force,rotational angular acceleration and driving torque to realize“kinetic accumulation-directional release”impact mechanism under a phase-triggering mechanism.On this basis,an optimization method for transient impact excitation with dynamically varying angular velocity is proposed.Based on parametric modeling and simulation experiments,a comparative study with conventional excitation modes demonstrates that:(1)The proposed impact excitation mode in this paper generates a continuous pulse-like waveform,with a significant amplitude enhancement in the low-frequency range of 2-5 Hz,where the energy output at 2 Hz increases by more than 20%.(2)Compared with the constant-frequency mode,the autocorrelation waveform produced by the impact excitation mode exhibits a sharper main lobe and faster sidelobe attenuation,achieving a 30%improvement in wavelet compression ratio at 2 Hz.The proposed method effectively enhances the low-frequency excitation performance of eccentric-wheel-based controlled seismic vibrator,providing a new design concept and optimization path for the advancement of eccentric-wheel-based controlled vibrator technology.
作者
洪利
郭宏鑫
张强
HONG Li;GUO Hongxin;ZHANG Qiang(Hebei Key Laboratory o fSeismic Disaster Instrument and Monitoring Technology,Sanhe 065201,China;College of Information and Control Engineering,Institute of Disaster Prevention,Sanhe 065201,China;Langfang Key Laboratory of Accurately-Controlled Active Seismic Source,Sanhe 065201,China)
出处
《防灾科技学院学报》
2025年第4期50-61,共12页
Journal of Institute of Disaster Prevention
基金
中央高校基本科研业务费专项资助项目(ZY20250203)
中央高校基本科研业务费研究生科技创新基金资助(ZY20260315)
2024年廊坊市科学技术研究与发展计划自筹经费项目(2024011011)。
关键词
偏心轮式可控震源
冲击激振
角速度优化
低频增强
最优化方法
eccentric-wheel-type controlled seismic source
impact excitation
angular velocity optimization
low-frequency enhancement
optimization method
