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Method for non-intrusion measuring human hand and arm joint

A non-invasive, measurement method technology, applied in the field of measurement, can solve problems such as strict positioning requirements for marker points, many marker points, and no consideration of the relative motion of skin, muscles and bones.

Inactive Publication Date: 2006-03-22
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above method has the following problems: many marker points are required, generally 7, at least 5 marker points, and the positioning requirements of the marker points are strict; placing more marker points on the arm may affect the natural movement of the arm; using skin markers Calculations of spatial reconstruction and kinematics and dynamics of the musculoskeletal system should not take into account the relative motion of the skin, muscles and bones

Method used

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  • Method for non-intrusion measuring human hand and arm joint
  • Method for non-intrusion measuring human hand and arm joint
  • Method for non-intrusion measuring human hand and arm joint

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Experimental program
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Embodiment

[0037] Concrete steps of the present invention are as follows:

[0038] 1. Data measurement

[0039] Such as figure 1 As shown, four (A, B, C and D four points in the figure) 6-degree-of-freedom pose trackers are fixed near the three joints of the measurer's arm, and it can accurately obtain its position relative to the reference through electromagnetic induction. The position and direction of the measurement point, that is, four coordinate systems are fixed at four measurement points, and the data obtained by each tracker is the position of the origin of the coordinate system coordinates of the measurement point and the rotation of the three axes. These data are Described under the reference coordinate system, the reference coordinate system is determined by the placement position and attitude of the electromagnetic launch unit, and one electromagnetic launch unit can obtain the pose data of multiple trackers. Connect the tracking device with the computer through the serial...

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Abstract

The present invention belongs to the field of human engineering and measuring technology, and the non-intrusive arm joint measuring method includes the following three steps: 1. acquiring the arm motion data via fixing four pose trackers separately in the positions near the joint of hand, the lower arm, the upper arm and the shoulder and fixing four coordinate systems separately; 2. establishing arm motion model via considering the bones between the arm joints as rigid bodies to form one 7-freedom parameterized spatial link rod mechanism; and 3. solving to find out the joint centers and rotation shafts via obtaining the instantaneous positions of the joint centers in any two motions. The present invention is easy to realize measurement and simple in calculation, and has least measurement points needed.

Description

technical field [0001] The invention relates to a method in the technical field of measurement, in particular to a non-invasive method for measuring human arm joints. Background technique [0002] Quantification of arm motion is very important in ergonomic and biomechanical analysis. The measurement data of translation and rotation of joints and bones, on the one hand, can be directly used in the evaluation of the operator's posture on the workstation, on the other hand, in kinematics and dynamics analysis, it can be used as input data to analyze the joint force and moment evaluation. It is also the basis for a more precise biomechanical analysis of body stress and injury safety related to various industrial tasks. The key to these applications is the precise positioning of the center of the joint. The determination of the center of the arm joint is the basis for the analysis of arm kinematics and dynamics. The technique of determining the center of rotation of the joint i...

Claims

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Application Information

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IPC IPC(8): A61B5/11A61B5/107
Inventor 杨润党范秀敏武殿梁严隽琪
Owner SHANGHAI JIAO TONG UNIV