Active damping positioning device for dynamic gravity meter

Abstract

The invention discloses an active damping positioning device of a dynamic gravity meter. The device at least comprises a damping coil, a PID (Proportion Integration Differentiation) controller and a shock insulation mechanism; an annular positioning groove is arranged in the bottom part of a tubular mass block; the damping coil is fixed into the positioning groove and positioned at one side of a detecting coil; the PID controller is positioned in the periphery of a gravity meter housing; the PID controller is respectively connected with a capacitive displacement sensor and the damping coil through communication lines; the shock insulation mechanism comprises a gyroscope stabilizing platform, a first super-long spring, a second super-long spring and a base frame; the gravity meter housing is fixedly mounted on the gyroscope stabilizing platform and positioned in the base frame; the upper surface of the gyroscope stabilizing platform is flexibly connected with the top part of the base frame through the first super-long spring and the second super-long spring. With the adoption of the device, a large damping coefficient can be obtained, thus a plurality of problems caused by air damping or liquid damping of the traditional dynamic gravity meter can be solved, the measuring precision of the dynamic gravity meter is improved, and the long-term stability is also improved.

Description

technical field [0001] The invention relates to a gravity measuring device, in particular to an active damping positioning device for a dynamic gravimeter. Background technique [0002] The dynamic gravimeter will inevitably be affected by the acceleration of the carrier during the working process. The disturbance source is waves, ship power equipment or aircraft engine. Therefore, the output value of the gravimeter is actually the superposition of gravity acceleration and vertical disturbance acceleration, and The intensity of the latter is tens of thousands or even hundreds of thousands of times greater than that of the former, so we must try to remove the vertical disturbance acceleration from the output signal of the instrument. Since the vertical disturbance acceleration has periodic characteristics, and its period is much smaller than the abnormal period of gravity, the dynamic gravimeter often applies strong damping to the sampling mass to greatly compress t...

AI Technical Summary

Problems solved by technology

The operating temperature and storage temperature of the marine gravimeter usually differ by more than 20°C. The volume of the liquid in the sealed tank will expand or contract with the change of temperature. A volume compensation device must be installed to compensate for the change of liquid volume, which increases the complexity of the system. , and the volume expansion leads to an increase in the pressure in the sealed tank, and long-term work is prone to leakage of damping fluid, which affects the long-term stability of the instrument

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