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Double-shaft centrifuge based gyro accelerometer testing method

A double-axis centrifuge and accelerometer technology, which is applied in the direction of speed/acceleration/shock measurement, speed/acceleration/shock measurement equipment testing/calibration, and measuring devices, which can solve the problems that the test method is far from being developed.

Inactive Publication Date: 2012-12-26
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the test method of the gyro accelerometer on the double-axis centrifuge is far from being carried out.

Method used

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  • Double-shaft centrifuge based gyro accelerometer testing method
  • Double-shaft centrifuge based gyro accelerometer testing method
  • Double-shaft centrifuge based gyro accelerometer testing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] combine figure 1 , this embodiment adopts the JML-1 type double-shaft centrifuge developed by Harbin Institute of Technology, including the double-shaft centrifuge rotary main shaft 1 and the reverse platform rotary shaft 2, the double-axis centrifuge rotary main shaft and the reverse platform back The distance between the rotating shafts is R; is the rotational angular velocity vector of the main shaft and arm of the centrifuge, In order to reverse the angular velocity vector of the platform rotation, it is stipulated that and The positive direction of is vertically upward,

[0049]According to the composition theorem of rigid body compound motion angular velocity, the implicated angular velocity relative angular velocity Then invert the absolute angular velocity of any point on the platform relative to the ground base for:

[0050] w → a = w ...

Embodiment 2

[0080] combine figure 1 , figure 2 , different from the test on the precision centrifuge of the non-gyro pendulum accelerometer, when the gyro accelerometer is tested on the two-axis precision centrifuge, the centripetal acceleration component on the input axis of the accelerometer is an alternating sinusoidal signal, and the gyro accelerometer The output will also be affected by the rotational angular velocity of the housing itself relative to the inertial space. The basic steps of the test method for the gyro accelerometer provided by the invention on a two-axis precision centrifuge are as follows: figure 2 shown. figure 1 In , the distance R between the rotating shaft 1 of the centrifuge and the rotating shaft of the reversing platform is known precisely; is the rotational angular velocity vector of the arm of the centrifuge, In order to reverse the angular velocity vector of the platform rotation, it is stipulated that and The positive direction of is vertically...

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Abstract

The invention relates to a double-shaft centrifuge based gyro accelerometer testing method. Two grating strips are arranged on a reversal platform, grating reading heads are arranged on a large arm of a centrifuge, a connection line of the two grating strips passes through the axle center of the reversal platform, after the installation is finished, a main shaft of the double-shaft centrifuge and the reversal platform can operate at different rotating speeds and are always in a reversal synch state. By making the time of integer circle or semicircle rotation of the double-shaft centrifuge as a sampling period, the output pulse number of a gyro accelerometer under test is read, and then a calibration result of each error model coefficient is obtained by using a regression analysis method. The testing method can be used for accurately calibrating high-order error term coefficients and particularly the K2 term of the gyro accelerometer, and meanwhile, the data processing accuracy is increased.

Description

technical field [0001] The invention relates to a testing method of a high-precision inertial instrument, in particular to a testing method of a gyro accelerometer based on a biaxial centrifuge. Background technique [0002] During the working process of the inertial system, the navigation error caused by the error of the gyro accelerometer is accumulated over time. In order to improve the precision of the inertial navigation system, it is very important to improve the precision of the gyro accelerometer. Improving the accuracy of the gyro accelerometer should be developed from two aspects: on the one hand, continuously improve and improve the instrument design and process technology, and develop a high-precision and high-stable inertial instrument table; on the other hand, the error modeling and testing of the instrument Research, improve the calibration accuracy, and use the corresponding method to compensate and correct. Further improving the accuracy of the inertial in...

Claims

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Application Information

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IPC IPC(8): G01P21/00
Inventor 刘雨于志伟杨毓乔永辉苏宝库曾鸣
Owner HARBIN INST OF TECH
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