Preloaded Parallel Six-Dimensional Acceleration Sensor and Its Measurement and Sensitivity Analysis Method

Abstract

The invention discloses a pre-tightened parallel six-dimensional acceleration sensor, a measuring method and a sensitivity analysis method thereof. The sensor adopts an eight-chain parallel mechanism as the elastic body structure of the sensor, which has higher rigidity and greater load-bearing capacity; the pre-tightening force can be applied to the piezoelectric ceramics through the pre-tightening device, and after the pre-tightening, the sensor can effectively The problem of distortion of the piezoelectric ceramic output signal is avoided, so that the sensor has better measurement accuracy. This measurement method can realize the real-time measurement of six-dimensional acceleration only by writing a program in the computer in advance, and its sensitivity analysis method excavates the inherent constraint relationship in the parallel mechanism of the sensor, establishes the force coordination equation, and makes the sensitivity model of the sensor hyperstatically indeterminate The solution of the problem is transformed into the solution of the statically indeterminate problem, so as to derive the analytical expression of the sensitivity of the sensor, which provides theoretical guidance for the subsequent structural optimization design of the sensor.

Description

technical field [0001] The invention belongs to the technical field of inertial measurement, and in particular relates to a pre-tightened parallel six-dimensional acceleration sensor, a measurement method and a sensitivity analysis method thereof. Background technique [0002] As a key component for obtaining information, acceleration sensors play an important role in fields such as engineering vibration measurement, industrial control, inertial navigation and guidance. The theory and technology of traditional low-dimensional acceleration sensors have been perfected day by day, and various acceleration sensor products on the market are not uncommon, but most of them are single-axis sensors. With the diversified development of information and the improvement of information measurement requirements, people are no longer limited to the measurement of pure linear acceleration and pure angular acceleration parameters, and put forward higher requirements for acceleration sensors. ...

AI Technical Summary

Problems solved by technology

But its shortcoming is that the triple compound hinge is introduced in the parallel mechanism, the structure is complex and the processing is difficult. In actual engineering, it is difficult to ensure that the rotation centers of the three flexible spherical It cannot withstand large tensile forces and needs to be preloaded before use, but due to structural limitations, this configuration cannot apply preloads along the axial direction of the branch chain

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