A Calibration Method for a Multi-support Piezoelectric Force Meter
A calibration method and dynamometer technology, applied in the direction of force/torque/work measuring instrument calibration/testing, instruments, measuring devices, etc., can solve the problem that the test accuracy does not meet the test requirements, etc. requirements, the effect of improving reliability
Active Publication Date: 2019-07-12
DALIAN UNIV OF TECH
View PDF3 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
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
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment 1
[0035] Embodiment 1, the upper plate 6 of the multi-fulcrum piezoelectric dynamometer to be calibrated in the present invention is the upper plate 6 of the four-fulcrum piezoelectric dynamometer, the size is 186×186×35mm, and the size of the lower plate is 186×186×20mm, 4 The size of a piezoelectric force sensor is 40×40×14mm, and the layout spacing is 140mm; the calibration system includes a standard force measuring ring 93618 with a range of 6000N, 4 sets of Kistler charge amplifiers 5018, 1 data acquisition card DT9804, and 1 set with Dewesoft 6 computers.
[0036] The first step is to calibrate the force gauge
[0037]Fix the upper plate (6) of the multi-pivot piezoelectric dynamometer on the base (5) of the loading platform through bolts, so that the diagonal line of the upper plate of the dynamometer is located on the moving surface (7) of the main direction force, and the liquid level ( 14) Place it on the guide rail (10), adjust the lock nut (11), make the guide rail ...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More 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
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Patents(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