Cable Motion Display With MR Brake for Sport Movement Evaluation
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Solution Overview
Problem
Conventional muscle training apparatuses are unsuitable for evaluating motion states suitable for improving sport performance, as they restrict movement to specific muscles or body parts and are not effective for coordinating the entire body's muscles, making them unstable for practical sport movement evaluation.
Innovation Solution
A motion state display device that includes a cable paid out during user movement, a measurer to calculate stroke amount, a magneto-rheological fluid brake to adjust braking force based on the stroke amount, and a display to show paying-out rate, speed information, or waveforms, allowing for realistic movement evaluation without structural restrictions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional muscle training apparatuses with fixed structures are used, then specific muscle training is achieved, but movement freedom and coordination of entire body muscles are restricted
Solution Approach 1:
The patent replaces conventional mechanical resistance systems with a magnetic field-based resistance system. The magneto-rheological fluid brake generates resistance through magnetic field control rather than mechanical contact, allowing the cable to move freely in three-dimensional space without mechanical constraints while still providing controllable load resistance.
Solution Approach 2:
The patent changes the resistance mechanism from fixed mechanical friction to dynamically adjustable magnetic resistance. By controlling the magnetic field strength applied to the magneto-rheological fluid, the resistance level can be varied continuously without changing the physical structure of the apparatus, enabling both free movement and coordinated muscle engagement.
2Adaptability or versatility
If simple movement patterns are used in training apparatuses, then specific muscle training is achieved, but practical sport movement evaluation is not possible
Solution Approach 1:
The patent transitions from evaluating only linear or rotational movement to capturing three-dimensional spatial movement. The cable can be paid out in any direction in 3D space, and the measuring device tracks position, speed, and acceleration vectors across all three dimensions, enabling evaluation of complex sport movements that cannot be captured by conventional single-axis systems.
Solution Approach 2:
The patent implements real-time feedback by measuring cable payout speed, position, and acceleration, then displaying this information to the user. This feedback loop allows athletes to evaluate their actual motion states against ideal performance patterns, enabling precise assessment of complex multi-dimensional movements for sport performance improvement.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables performance evaluation aligned with practical sport movements by applying dynamic loads that coordinate the entire body's muscles, providing visualization of movement speed and load changes, thus improving sport performance assessment.
Implementation Method 1
a magneto-rheological fluid brake to apply a braking force to the cable
Data Source
AI summary
A motion state display device includes a cable that is paid out in response to movement of a user, a reel on which the cable is wound, a rotary encoder to detect a rotation state of the reel, a magneto-rheological fluid brake to apply a braking force to the reel, a controller configured or programmed to control the braking force according to a stroke amount of the cable calculated based on an output value of the rotary encoder, to change a load for the movement, and a display to display an actual measured waveform of a speed at which the cable is paid out.