Passive servo large-damping earthquake rotation accelerometer

Abstract

The invention provides a passive servo large-damping earthquake rotation accelerometer, and belongs to the field of earthquake measurement devices. The passive servo large-damping earthquake rotation accelerometer comprises a bottom plate, a spoke-type mass spring device, two swing-type passive servo large-damping moving coil transducers and a circuit board. Each swing-type passive servo large-damping moving coil transducer comprises a swing frame, a moving coil assembly and a magnetic circuit system. One ends of the two swing frames are symmetrically installed on the two sides of a mass ring of the spoke-type mass spring device, and the moving coil assemblies are installed at the other ends of the swing frames and stretch into magnetic gaps of the magnetic circuit systems. The circuit board comprises two passive servo large-damping moving coil transduction circuits, two angular acceleration conditioning circuits and a combination circuit. The transducers are connected with the input ends of the transduction circuits, the output ends of the transduction circuits are electrically connected with the input ends of the angular acceleration conditioning circuits, and the output ends of the two angular acceleration conditioning circuits are connected with the combination circuit. The combination circuit is used for eliminating non-rotation components, combining rotation components and outputting voltage signals in direct proportion to the earthquake rotation acceleration.

Description

technical field [0001] The invention relates to the field of accelerometers, in particular to a passive servo large damping seismic rotation accelerometer. Background technique [0002] Usually strong earthquake observations use a three-component translational accelerometer. In fact, the complete motion characteristics of a rigid body at one point during an earthquake is a six-degree-of-freedom vibration, which includes three translations and three rotations, especially near-field vibrations. more obvious. [0003] At present, the phenomenon of rotational damage has been found in many large earthquakes. A large number of studies have also found that in the seismic response of structures, the rotational component can generate large shear force and bending moment in the structural members. However, due to the lack of records of the rotational component, many countries have not considered the rotational effect in the seismic design of structures. [0004] In order to solve th...

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Problems solved by technology

[0010] However, the above-mentioned seismic rotational accelerometers have disadvantages such as complex circuits and difficult adjustments. At present, there are no products of passive servo large damping seismic rotational accelerometers at home and abroad.

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