Rotating Motion Assessment Using Dual Coordinate Load Analysis
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Solution Overview
Problem
Existing motion assessment technologies fail to provide a clear index for body load in high-acceleration rotating actions, particularly in sports like baseball pitching, where joint loads are high and injuries are common, due to treating the body as a rigid model.
Innovation Solution
A method and system that assesses body load by comparing rotating coordinate system data with world coordinate system data, using a rotating center definition and conversion to visualize and evaluate performance and load in motions exceeding 9.8 m/sec² acceleration, considering the body as semi-rigid.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the body is treated as a rigid model using fixed local coordinates for motion analysis, then performance assessment (e.g., pitching speed maximization) can be executed, but assessment in terms of body load cannot be made
Solution Approach 1:
The patent transitions from a static rigid body model with fixed local coordinates to a dynamic model that accounts for body segment movements and rotations. By introducing time-varying coordinate transformations and considering the dynamics of each body segment, the system can now assess both performance and body load simultaneously, resolving the contradiction between measurement precision and information loss.
Solution Approach 2:
The patent changes the parameters used in motion analysis by introducing angular velocities, angular accelerations, and time-varying coordinate transformations. These parameter changes enable the calculation of inertial forces and moments, which are essential for body load assessment while maintaining performance assessment capabilities.
2Productivity
If multiple individual independent fixed local coordinates are used for optimization processing in human body simulation, then performance assessment is excellent, but body load assessment cannot be made
Solution Approach 1:
The patent segments the human body into multiple rigid segments (trunk, upper arms, forearms, hands, thighs, shanks, feet) and assigns separate coordinate systems to each segment. This segmentation allows independent optimization processing for each segment while simultaneously enabling load assessment through the calculation of inter-segment forces and moments, thus resolving the contradiction between productivity and information loss.
Solution Approach 2:
The patent introduces intermediate coordinate systems and transformation matrices as mediators between the fixed local coordinates and the global coordinate system. These intermediaries enable the calculation of velocities and accelerations in multiple reference frames, facilitating both performance optimization and body load assessment without losing critical information.
3Manufacturing precision
If fixed local coordinates are used for motion analysis, then performance optimization can be achieved, but the semi-rigid nature of the body cannot be considered
Solution Approach 1:
The patent applies dynamic coordinate transformations that adapt to the actual motion of each body segment. By using time-varying rotation matrices and considering the angular velocities and accelerations of each segment, the model adapts to the semi-rigid nature of the human body while maintaining high precision in motion optimization and performance assessment.
Data Source
AI summary
Provided are a rotating action motion assessment method and system and a program with which a body load applied on a joint or the like of a body, performance and the like can be visualized and assessed by relatively comparing, in a motion accompanied by a rotating action at an acceleration equal to or higher than 9.8 m/sec2, rotating coordinate system coordinate data on an own rotating action and world coordinate system data on the own rotating action with each other. The rotating action motion assessment method includes: a rotating center definition step of defining a rotating center from an actually existing rotating center and/or an ideal rotating center; a step of obtaining world coordinate system coordinate data; a step of converting the obtained data to rotating coordinate system local coordinate data being local coordinate data in a rotating coordinate system having, as an origin, a rotating center in a human body in the rotating action; and an assessment step of relatively comparing and assessing values of two pieces of data being the world coordinate system coordinate data and the rotating coordinate system local coordinate data on a predetermined position in the human body which are obtained from the same action in the rotating action.