• 新技术应用 •

### 无源伺服大阻尼地震转动加速度传感器

1. 1 哈尔滨学院, 哈尔滨 150080;
2 中国地震局工程力学研究所, 中国地震局地震工程与工程振动重点实验室, 哈尔滨 150080
• 收稿日期:2018-04-11 修回日期:2018-06-29 出版日期:2018-10-20 发布日期:2018-11-29
• 通讯作者: 高峰,男,1974年生,硕士,高级工程师,主要从事振动仪器研制及振动测试技术研究,E-mail:gaofenggao@126.com
• 作者简介:曲明哲,女,1976年生,2007年于黑龙江大学获电子工程专业硕士学位,副教授,主要从事信号与信息处理、通信、编码等相关研究,E-mail:qmz7652@163.com。
• 基金资助:
黑龙江省教育科学“十三五”规划2017年度重点课题（GBB1317063）、中国博士后基金（2017M611339）、黑龙江省高等教育教学改革工程项目（SJGY20170240）和国家重点研发计划项目（2017YFC1500805）共同资助

### RESEARCH ON PASSIVE SERVO SEISMIC ROTATIONAL ACCELERATION SENSOR WITH LARGE DAMPING

1. 1 Harbin University, Harbin 150080, China;
2 Key Laboratory of Earthquake and Engineering and Engineering Vibration, Institute of Engineering Mechanics, China Earthquake Administration, Harbin 150080, China
• Received:2018-04-11 Revised:2018-06-29 Online:2018-10-20 Published:2018-11-29

Abstract: Many strong motion records show that under the strong seismic vibration of, the torsional disfigurement of building structures is a common and serious damage. At present, there are no special sensors for measuring seismic rotation in the world. Most of the experts obtain rotational components through observing deformation, theoretical analysis and calculation. The theory of elastic wave and source dynamics also prove the conclusion that the surface of the earth will rotate when an earthquake occurs. Based on a large number of investigations and experiments, a rotational acceleration sensor was developed for the observation of the rotational component of strong ground motions. This acceleration sensor is a double-pendulum passive servo large-damped seismic rotational acceleration sensor with the moving coil transducer. When an earthquake occurs, the seismic rotational acceleration acts on the bottom plate at the same time. The magnetic circuit system and the middle shaft fixedly connected to the bottom plate follow the bottom plate synchronous vibration, and the moving part composed of the mass ring, the swing frame and the moving ring produces relative corners to the central axis. The two working coils mounted on the two pendulums produce the same relative motion with respect to the magnetic gaps of the two magnetic circuits. Both working coils at this time generate an induced electromotive force by cutting magnetic lines of force in the respective magnetic gaps. The generated electromotive forces are respectively input to respective passive servo large damper dynamic ring transducer circuits and angular acceleration adjusting circuits, and the signals are simultaneously input to the synthesizing circuit after conditioning. Finally, the composite circuit outputs a voltage signal proportional to the seismic rotational acceleration to form a seismic rotational acceleration sensor. The paper presents the basic principles of the rotational acceleration sensor, including its mechanical structure diagram, circuit schematic diagram and mathematical models. The differential equation of motion and its circuit equation are derived to obtain the expressions of the main technical specifications, such as the damping ratio and sensitivity. The calculation shows that when the damping ratio is much larger than 1, the output voltage of the passive servo large damping dynamic coil transducer circuit is proportional to the ground rotation acceleration, and the frequency characteristic of bandpass is wider when the damping ratio is larger. Based on the calibration test, the dynamic range is greater than or equal to 100dB and the linearity error is less than 0.05%. The amplitude-frequency characteristics, the phase-frequency characteristics and their corresponding curves of the passive servo rotational acceleration sensor are acquired through the calculations. Based on the accurate measurement of the micro-vibration of the precision rotating vibration equipment, the desired result is obtained. The measured data are presented in the paper, which verify the correctness of the calculation result. The passive servo large damping rotational acceleration sensor has simple circuit design, convenient operation and high resolution, and can be widely applied to seismic acceleration measurement of earthquake or structure.