Multi-node Motion Measurement System for Sports Analysis
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Solution Overview
Problem
Current motion capture technologies either lack the ability to capture human body motion effectively, are costly, or require complex calibration and high setup costs, especially when trying to measure both human body and sports appliance motion simultaneously.
Innovation Solution
A multi-node motion measurement and analysis system comprising adjustable motion measurement modules that can be bound to both the human body and sports appliances, using MEMS sensors and RF modules to transmit data to a receiver unit for processing, allowing flexible placement and reducing the number of required modules.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If optical motion capture system with multiple cameras is used, then measurement precision is improved, but device complexity and cost increase significantly
Solution Approach 1:
The patent replaces the complex optical camera system with a mechanical inertial sensor-based IMU (Inertial Measurement Unit). The IMU uses micro accelerometers and micro gyroscopes to directly measure motion parameters without requiring external cameras or complex optical setups, thereby reducing device complexity while maintaining measurement capability
Solution Approach 2:
The patent extracts the essential measurement function from the complex optical system by using only the necessary inertial sensors (accelerometers and gyroscopes) to capture motion data, eliminating the need for multiple cameras, markers, and complex calibration procedures
2Measurement precision
If optical motion capture system is used, then measurement precision is improved, but ease of operation deteriorates due to tedious calibration
Solution Approach 1:
The IMU performs self-calibration and self-measurement without requiring external equipment or complex calibration procedures. The inertial sensors automatically calculate position and orientation through integration of acceleration and angular velocity signals, eliminating the need for external cameras and manual calibration processes
3Ease of manufacture
If single-node motion capture with MEMS sensor is used, then cost is reduced, but measurement precision deteriorates as it cannot capture human body motion
Solution Approach 1:
The patent makes the IMU universal by enabling it to measure motion of multiple objects simultaneously - both the sports appliance and different parts of the human body. The same inertial sensor module can be attached to various locations (club, wrist, waist, etc.) to capture comprehensive motion data for multi-node analysis
Solution Approach 2:
The patent divides the measurement system into multiple independent IMU nodes that can be distributed across different body parts and equipment. Each node independently measures local motion, and the combined data provides comprehensive human body and sports appliance motion capture capability
4Measurement precision
If multiple sports appliances require sensor integration, then measurement precision is improved, but device complexity and cost increase
Solution Approach 1:
The patent creates a universal IMU module that can be attached to any sports appliance or body part without requiring custom integration for each application. The standardized sensor module with adjustable fixture provides consistent measurement capability across multiple appliances and measurement scenarios
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 simultaneous measurement of human body and sports appliance motion, reducing costs and improving accuracy by allowing flexible placement of modules, while providing detailed motion information such as trajectory, speed, and angle.
Implementation Method 1
As the Micro Electro Mechanical System (MEMS) technology develops rapidly and the technology of micro inertial sensor continues to mature
Implementation Method 2
The inertial measurement unit usually includes a micro accelerometer (measuring an acceleration signal) and a micro gyroscope (measuring an angular velocity signal)
Implementation Method 3
The inertial measurement unit usually includes a micro accelerometer (measuring an acceleration signal) and a micro gyroscope (measuring an angular velocity signal)
Implementation Method 4
a first RF module connected to the first microprocessor module and configured to receive the information of acceleration, angular velocity and inclination angle and transmit the received information to the receiver unit
Data Source
AI summary
A multi-node motion measurement and analysis system comprises at least one motion measurement module and a receiver unit. The motion measurement module is bound to a hand-held sports appliance through an adjustable fixture or being bound to a human body. A binding position on the human body is rearrangeable based on different measurement requirements. The motion measurement module comprises a sensor module configured to measure information of acceleration, angular velocity and magnetic force, a first microprocessor module connected to the sensor module and configured to generate information of orientation, and a first RF module configured to receive the information of acceleration, angular velocity, magnetic force and orientation and transmit the received information to the receiver unit. The receiver unit generates motion information according to the information of acceleration, angular velocity, magnetic force and orientation, and calibrates the motion measurement module bound to different positions on the human body.