Rotation acceleration meter for earthquake

Abstract

The invention relates to a rotation acceleration meter for earthquake. The meter comprises a shell and a bottom plate. A spoke type mass spring device, two groups of symmetrically and reversely installed swinging type differential capacitive transducers, two groups of moveable coil dampers and a circuit board are arranged in the shell. The spoke type mass spring device is located between the two groups of swinging type differential capacitive transducers which respectively comprise an outer moveable polar plate, an inner moveable polar plate and a fixed polar plate. The circuit board comprises two capacitor voltage converting circuits, two conditioning circuits, a synthetic circuit and two damp adjusting circuits. The rotation acceleration meter for earthquake provided by the invention is compact in structure, reasonable in design, high in monitoring precision, good in reliability and wide in application range.

Description

technical field [0001] The invention relates to an accelerometer, in particular to a double-differential seismic rotation accelerometer based on a spoke-type mass spring device for strong earthquake observation. Background technique [0002] At present, the well-known strong earthquake observations use three-dimensional accelerometers, and the accelerations obtained are often considered as three translational vibrations in the east-west, north-south, and vertical directions. In fact, the complete motion characteristics of a rigid body at one point during an earthquake also include For rotation, it is necessary to measure vibrations with 6 degrees of freedom, that is, three translations and three rotations, especially near-field vibrations, where the rotation component is more obvious. At present, the phenomenon of rotational damage has been found in many major earthquakes. For example, more rotational damage has occurred in slender and tall buildings (such as chimneys, obeli...

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Problems solved by technology

A large number of studies have also found that in the seismic response of structures, the rotational component can generate a large shear force and bending moment in the structural members, and the torsional and sway components contribute greatly to the structural response. However, due to the lack of records of the rotational component, many The country does not consider the rotation effect in the seismic design of the structure

At present, there are no products of seismic rotational accelerometers at home and abroad, and the inertial navigation six-degree-of-freedom measurement system used in aerospace, the measured rotational quantity is angular velocity, and there are still many technical problems in the direct use of seismic rotational acceleration measurement

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