Multi-support piezoelectric dynamometer calibration method

A calibration method and technology of a dynamometer, applied in the direction of force/torque/power measuring instrument calibration/testing, instruments, measuring devices, etc., can solve the problems that the test accuracy does not meet the test requirements, etc., and achieve the improvement of calibration accuracy and reliability sex, the effect of increasing the absolute value

Active Publication Date: 2018-01-23
DALIAN UNIV OF TECH
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AI Technical Summary

Problems solved by technology

When the distance from the force point to the center point exceeds a certain range, the test accuracy does not meet the test requirements

Method used

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  • Multi-support piezoelectric dynamometer calibration method
  • Multi-support piezoelectric dynamometer calibration method
  • Multi-support piezoelectric dynamometer calibration method

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Experimental program
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Embodiment 1

[0035] Embodiment 1, the object 6 to be calibrated in the present invention is a four-point piezoelectric force measuring instrument, the size of the upper plate is 186×186×35mm, the size of the lower plate is 186×186×20mm, and the size of the four piezoelectric force sensors is 40× 40×14mm, the layout spacing is 140mm; the calibration system includes a standard force measuring ring 93618 with a range of 6000N, 4 Kistler charge amplifiers 5018, a data acquisition card DT9804, and a computer with Dewesoft 6 installed.

[0036] The first step is to calibrate the force gauge

[0037]Fix the four-point piezoelectric dynamometer (6) on the base (5) of the loading platform by bolts, so that the diagonal line of the upper plate of the dynamometer is located on the main force moving surface (7), and the liquid level (14) Place it on the guide rail (10), adjust the lock nut (11) to make the guide rail (10) in the horizontal direction, turn the hand wheel (15), and move the main directi...

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Abstract

The invention provides a multi-support piezoelectric dynamometer calibration method. The method is characterized by, through a translational main force loading mechanism, ensuring that force lines ofthe main load force and axes of piezoelectric three-dimensional force sensors are overlapped; applying full scale of main force, repeating applying the force for many times, and collecting and repeating output voltage; carrying out pretreatment on the data, and obtaining a force-power relation expression at each loading point according to the principle of equilibrium of forces; and combining the force-power relation expressions, constructing a calibration equation set model, calculating condition number of a coefficient matrix, calculating force-power conversion coefficient of each piezoelectric three-dimensional force sensor and finishing calibration of a dynamometer. The method, based on an existing calibration device and by improving the thought of calibration, sets a plurality of calibrated variables as unknown parameters, carries out multi-point calibration and establishes a multi-variable one-time calibration equation set without decoupling hypothesis of each support force, thereby solving the problem of principle error due to force distribution hypothesis in the previous calibration; and meanwhile, the method is not sensitive to position precision of each calibration point,and the positions at the axes of the sensors are selected as the calibration points.

Description

technical field [0001] The invention belongs to the technical field of piezoelectric force measurement and relates to a calibration method for a multi-support piezoelectric force measuring instrument, which can accurately and truly obtain the force-electricity conversion coefficient in the main direction, thereby improving the force measuring accuracy of the force measuring instrument in the entire plane. Background technique [0002] Acquisition of space six-dimensional force (three-dimensional orthogonal force Fx, Fy, Fz and moment Mx, My, Mz) and position information of force action point is used in rocket engine thrust test, real-time acquisition of center of gravity data of ejection seat system, robot operation wrist force test , High-precision machining machine tool testing, giant heavy-duty operating equipment force testing and other fields play an extremely important role. The six-dimensional force test is mostly carried out in the way of multi-sensor combination mea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01L25/00
Inventor 张军任宗金宋鹏田雨李明昱韩煜常庆兵卢炜昌
Owner DALIAN UNIV OF TECH
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