摘要
为了研究瞬变电磁场分布变化规律,在理论上推导了不同阻尼状态下的瞬变电磁暂态响应方程,并采用Simulink对瞬变电磁场暂态过程进行模拟仿真,设计开发了激励电流、发射回线、地质异常体、接收回线等效电路模块和互感关系模块;系统研究了电感、分布电容和电阻对发射和接收回线等效电路的影响。结果表明:发射回线的阻尼状态决定了瞬变电磁场激励波形特点,接收回线的阻尼状态则直接影响瞬变电磁场的衰减特征和观测质量。电路仿真结果对于抑制非地质因素的影响和指导瞬变电磁观测系统设计具有重要意义。
In order to analyze the distribution and variation law of transient electromagnetic field intuitively,the response equations of transient electromagnetic field under different damping states are theoretically derived,including a modeled transient process of transient electromagnetic field via Simulink.The equivalent circuit modules of excitation current,transmitting loop,geological anomaly body,receiving coil and their mutual inductance modules are developed.The influence of inductance,distributed capacitance and resistance on the equivalent circuit of transmitting and receiving loops are systematically studied.The results indicate a direct determination of the excitation waveform characteristics of the transient electromagnetic field based on the damping state of the transmitting loop,while the damping state of the receiving loop directly affects the attenuation characteristics and the observation quality of the transient electromagnetic field.The circuit simulation results are hugely significant in terms of restraining the non-geological influential factors and guide the design of transient electromagnetic observation system.
作者
刘世蕾
张莹
岳建华
LIU Shilei;ZHANG Ying;YUE Jianhua(School of Computer Science and Technology,China University of Mining and Technology,Xuzhou 221116,China;School of Resource and Geoscience,China University of Mining and Technology,Xuzhou 221116,China)
出处
《煤田地质与勘探》
CAS
CSCD
北大核心
2020年第2期209-215,共7页
Coal Geology & Exploration
基金
国家自然科学基金项目(41674133)。
