Passive servo earthquake rotation speedometer

Abstract

The invention provides a passive servo earthquake rotation speedometer and belongs to the field of earthquake measurement devices. The passive servo earthquake rotation speedometer comprises a bottom plate, a spoke type mass spring device, two pendulum type passive servo large damping moving coil transducers and a circuit board; each pendulum type passive servo large damping moving coil transducer is composed of a swing frame, a moving coil component 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; each moving coil component is installed at the other end of the corresponding swing frame and extends into a magnetic gap of the corresponding magnetic circuit system; the circuit board is composed of two passive servo large damping moving coil transduction circuits, two angular acceleration conditioning circuits and a synthesis circuit; the transducers are connected with the input ends of the corresponding transduction circuits; the output ends of the transduction circuits are electrically connected with the input ends of the corresponding angular acceleration conditioning circuits; the output ends of the two angular acceleration conditioning circuits are connected with the synthesis circuit separately; and the synthesis circuit is used for eliminating a non rotational component, synthesizing a rotational component and outputting a voltage signal which is proportional to an earthquake rotation acceleration.

Description

technical field [0001] The invention relates to the field of accelerometers, in particular to a passive servo seismic rotational velocity meter. 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 the above pro...

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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 seismic rotational accelerometers at home and abroad.

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