A Measuring Method of Initial Alignment Error of Centrifuge
A technology of initial alignment and measurement method, which is applied in the field of inertial instrument testing, can solve the problems of accuracy influence, test accuracy and low efficiency, and achieve the goal of ensuring alignment accuracy, overcoming low accuracy and low efficiency, and improving measurement efficiency Effect
Active Publication Date: 2021-06-08
HARBIN INST OF TECH
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Problems solved by technology
However, using the accelerometer’s own error model to calculate the accuracy of the alignment error is not only affected by the accuracy of the accelerometer itself, but also requires multiple measurements and repeated checks and adjustments. The test accuracy and efficiency are low. Therefore, a new and efficient centrifuge is designed. Initial alignment error measurement method is extremely important
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Embodiment 1
[0062] combine figure 1 , figure 2 , image 3 , Figure 4 and Figure 5 ;The centrifuge is mainly composed of a main shaft and three worktables. After installing the accelerometer, it should be ensured that the input axis of the accelerometer points to the center of rotation of the main shaft of the centrifuge, which is consistent with the direction of the working radius of the centrifuge. The initial alignment error of the centrifuge including the zero position error of the table and the misalignment angle of the tooling. A method for measuring the initial alignment error of a centrifuge according to the present invention, the steps are as follows:
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The invention provides a method for measuring the initial alignment error of a centrifuge, belonging to the technical field of inertial instrument testing. The centrifuge in the present invention is made of a main shaft and three workbenches, at first utilize the theodolite to adjust the axis of the centrifuge main shaft, the workbench axis, and theodolite line-of-sight axis in the same vertical plane, and calculate the theodolite by rotating the main shaft by 90° The distance between the center and the spindle axis, and then control the rotation of the spindle and the worktable at different angles, measure the horizontal angle by aligning the two ridges of the tooling with the theodolite, and finally identify the horizontal coordinates of the two vertical ridges by least squares, Calculate the centrifuge initial alignment error. The invention can accurately and efficiently measure the initial alignment error of the accelerometer tooling installed on the centrifuge, so as to ensure the alignment accuracy of the accelerometer on the centrifuge during testing without repeated testing, adjustment and calculation.
Description
technical field [0001] The invention relates to a method for measuring the initial alignment error of a centrifuge, belonging to the technical field of inertial instrument testing. Background technique [0002] The inertial instrument is an important part of the inertial navigation system. The accelerometer can measure the acceleration of the carrier in the moving space in real time, and its accuracy directly determines the accuracy of the final navigation. Therefore, it is necessary to carry out large-scale and high-dynamic tests on the accelerometer to simulate the real use environment. The precision centrifuge can generate an acceleration much higher than the gravitational field, which can truly test the performance of the accelerometer in a high overload environment, effectively stimulate the non-linear error term of the accelerometer, and improve the calibration accuracy of the accelerometer. [0003] The centrifuge mainly provides uniform angular velocity ω by the mai...
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IPC IPC(8): G01C25/00
Inventor 孙闯任顺清王振桓曾庆双王常虹
Owner HARBIN INST OF TECH