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Dynamic calibration method for treadmill force platform and system thereof

A technology of dynamic calibration and calibration system, which is applied in the direction of adjusting cardiovascular system training equipment, sports accessories, adjusting coordination training equipment, etc. Practical, impractical horizontal force calibration, etc.

Active Publication Date: 2021-05-11
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of these calibration methods require complex setups around force plates and are therefore impractical for use on large treadmills
Static weights have been used to calibrate instrument treadmills, however, they are impractical for horizontal force calibration
The methods of dynamic calibration do not take into account the effect on the accuracy and precision of the stage when dynamic loads are applied, that is, they do not take into account the dynamic response of the force sensor

Method used

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  • Dynamic calibration method for treadmill force platform and system thereof
  • Dynamic calibration method for treadmill force platform and system thereof
  • Dynamic calibration method for treadmill force platform and system thereof

Examples

Experimental program
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Embodiment

[0064] Step 1 includes: hardware system and data acquisition system, hardware system such as figure 2 As shown, it includes a load-carrying frame 21, four three-dimensional force sensors 22 (model: Suzhou Obatel CL-TR2), and a treadmill 23 (model: American Models GZ8643). Because the structure of the bottom of the treadmill is relatively complicated, it is difficult to install the sensor directly on the bottom, so it is necessary to customize a load-bearing frame according to the size and structure of the treadmill body. The four corners of the bottom of the load-bearing frame are fixed with 4 three-dimensional force sensors and the XYZ of each sensor Keep the same direction to measure the force and moment applied to the treadmill force platform. The top of the frame is used to place and fix the treadmill body. Calculate the center of pressure CoP (center of pressure) according to the force and moment measured by the three-dimensional force sensor:

[0065]

[0066]

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Abstract

The invention discloses a dynamic calibration method for a treadmill force platform and a system thereof. The method comprises the steps that the treadmill force platform and a calibration system of the treadmill force platform are built; the input quantity A is applied to the treadmill force table through the calibration system, and meanwhile the output quantity S of the treadmill force table is recorded; a calibration matrix C is solved according to the input quantity A and the output quantity S; the calibration matrix C is further optimized through a deep learning method, nonlinear errors are compensated, and therefore the measurement error of the treadmill force table is smaller. By using the calibration system provided by the invention, the treadmill force platform can be conveniently and quickly calibrated, the labor cost and the time cost are greatly reduced, and a guarantee is provided for the reliability of a human motion analysis result.

Description

technical field [0001] The invention relates to the field of exercise evaluation, in particular to a dynamic calibration method and system for a treadmill force platform. [0002] technical background [0003] The force platform is a commonly used instrument for human motion analysis, and is used to measure the ground reaction force GRF and the center of pressure COP. From the FP data, other dynamic quantities can be calculated, such as: position of body center of gravity, energy (work or power), net joint forces and moments determined from dynamic and kinematic data by inverse dynamics methods. [0004] Since there is usually crosstalk between the output variables of a 3D force sensor, errors are unavoidable in the force table. Calibration is usually performed by the manufacturer before the product is delivered, but the accuracy of FP data may be reduced due to irregular in-situ installation processes, long-term use, and equipment aging. In addition, asymmetric deformation...

Claims

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Application Information

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IPC IPC(8): A63B22/02G06F17/16G06N3/04
CPCA63B22/02G06F17/16G06N3/044
Inventor 罗洁罗旭
Owner SUN YAT SEN UNIV
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