Flexible pendulous accelerometer

Abstract

The invention discloses a flexible pendulous accelerometer, which comprises a shell, a flexible rod, a torquer moving coil, a torquer stator consisting of a yoke iron and a permanent magnet, a signal sensor consisting of a signal sensor moving coil and a signal sensor stator, a triangular pendulous reed and a servoamplifier, wherein the shell is full of a damping liquid; the triangular pendulous reed, the torquer moving coil and the signal sensor moving coil form a pendulum module; the flexible rod ensures that the pendulum module and an instrument shell are elastically connected; and the torquer stator and the torquer moving coil form a torquer. The flexible pendulous accelerometer eliminates the Coulomb friction force caused by a pivot and a jewelled bearing compared with the prior jewelled bearing supporting mode due to adopting a flexible supporting mode; the flexible supporting has small rigidity in a sensitive direction of the accelerometer and has large rigidity in other directions at the same time, which improves instrument measurement precision as well as vibration-resistant and shock-resistant abilities; the flexible pendulous accelerometer adopts a liquid for damping, and has better overload capacity and shock-resistant capability compared with a quartz flexible pendulous accelerometer adopting air damping.

Description

technical field [0001] The invention relates to a flexible pendulum accelerometer, in particular to a pendulum accelerometer supported by an oil-filled metal flexible material, which can be used as an acceleration sensitive element for aerospace inertial measurement and inertial navigation, and can also be used as an environmental The harsher on-board accelerometers. Background technique [0002] Traditional pendulum accelerometers are divided into gem bearing pendulum accelerometers, liquid floating pendulum accelerometers and flexible pendulum accelerometers according to their support methods. For gem bearing pendulum accelerometers, the detection mass is fixed on a single pendulum , the other end of the movable system is hinged on the housing through a jewel bearing, and the inherent Coulomb friction in the jewel bearing support method cannot be overcome, which will inevitably reduce the accuracy of the instrument; as far as the liquid floating pendulum accelerometer is c...

AI Technical Summary

Problems solved by technology

[0002] Traditional pendulum accelerometers are divided into gem bearing pendulum accelerometers, liquid floating pendulum accelerometers and flexible pendulum accelerometers according to their support methods. For gem bearing pendulum accelerometers, the detection mass is fixed on a single pendulum , the other end of the movable system is hinged on the housing through a jewel bearing, and the inherent Coulomb friction in the jewel bearing support method cannot be overcome, which will inevitably reduce the accuracy of the instrument; as far as the liquid floating pendulum accelerometer is concerned, the detection The mass is suspended in the shell by the liquid float, and is supported and positioned by jewel bearings. Although the liquid float technology is used to balance part of the Coulomb friction force, the friction force still exists, and the use of the liquid float support method increases the design and process of the system. Difficulty; as far as the flexible pendulum accelerometer is concerned, the currently commonly used quartz flexible pendulum accelerometer (quartz watch for short) uses quartz material as the flexible rod support material. Air damping is used inside the upper meter, resulting in poor impact resistance and large overload capacity

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