速度传感反馈地震计的参数稳定性分析

The stability analysis on parameter of feedback seismometer with a velocity transducer

从理论上定量分析机械摆和环路滤波等开环诸参数变化对速度传感反馈地震计闭环参数的影响。研究指出,在环路设计中可半自由选取的开环阻尼取值对参数稳定性有重要影响。过大或过小的开环阻尼取值均可能造成参数稳定性急剧变差,影响地震计在只标不调的状况下长期连续稳定工作。

The feedback seismometer with a velocity transducer is widely used in the local earthquake and reservoir earthquake observation. However, its parameter stability is poor. The influ ence of component aging varying with environment temperament and time lapse on feedback seismometer with a velocity transducer is larger than that of feedback seismometer with a displacement transducer. The tremendous difference in parameter stability of two types of seismometer has been confirmed by practical observation data. The effect of open-loop parameters, such as mechanical pendulum and loop filter, on closed-loop parameters of the feedback seismometer with a velocity transducer is analyzed in the paper. The research sug- gests that the value of openqoop damping affects importantly on parameter stability during the loop design. The parameter stability may deteriorate sharply if the value of the open-loop damping is too large or too small, which will affect seismograph long-term continuous work in the status of only calibration without adjustment. The relevant theoretical analysis conclusions and charts showed in the paper are important to the development, design and manufacture of the feedback seismometer with a velocity transducer.