Embedded IMU Baseball Kinematics Measurement
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Solution Overview
Problem
Current methods for baseball pitching training rely on qualitative assessments and expensive, invasive video-based motion capture systems, which are not viable for accurately measuring pitching mechanics and aerodynamics due to size and cost constraints of existing inertial measurement units (IMUs).
Innovation Solution
A highly miniaturized wireless inertial measurement unit (IMU) is embedded within a baseball to measure kinematics during pitching and free flight, providing detailed kinematic information such as velocity, angular velocity, and orientation, enabling precise training and evaluation of pitch types.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If video-based motion capture systems are used to measure pitching mechanics, then measurement precision is improved, but device complexity and cost increase
Solution Approach 1:
The patent replaces complex video-based motion capture systems with miniaturized inertial measurement units (IMUs) embedded in the baseball. The IMUs use accelerometers and gyroscopes to directly measure ball kinematics, substituting optical measurement infrastructure with self-contained inertial sensors that transmit data wirelessly, thereby reducing system complexity while maintaining measurement capability
Solution Approach 2:
The patent creates a simplified measurement model by embedding sensors directly in the baseball rather than tracking the ball through external cameras. The IMU captures essential kinematic data (acceleration, angular velocity) that replicates the information obtained from complex video systems but through a more compact, integrated approach
2Measurement precision
If commercial IMUs are used for baseball measurement, then measurement capability is improved, but ball size and mass increase prohibitively
Solution Approach 1:
The patent divides the measurement system into discrete, miniaturized components including separate accelerometer and gyroscope modules, each optimized for specific functions. This segmentation allows for compact packaging within the baseball while maintaining individual sensor performance requirements
Solution Approach 2:
The patent employs modern MEMS (micro-electromechanical systems) technology to dramatically reduce sensor size and mass parameters. The IMU components are fabricated at micrometer scales, enabling the entire measurement unit to weigh only a fraction of an ounce while still capturing accurate ball kinematics during pitching
3Measurement precision
If high-speed video analysis systems are used, then measurement precision is improved, but ease of operation deteriorates due to operator skill requirements
Solution Approach 1:
The patent implements self-service measurement by embedding intelligent sensors that automatically capture and process kinematic data without requiring external observation or manual tracking. The IMU autonomously records acceleration and angular velocity, eliminating the need for operators to manually analyze video frames or track ball position
Solution Approach 2:
The patent incorporates wireless transmission of measurement data from the embedded IMU to external recording devices, providing real-time feedback of ball kinematics. This automated data feedback loop eliminates manual measurement processes and reduces dependency on operator expertise for data collection and initial analysis
Data Source
AI summary
A measurement system having a miniature, wireless inertial measurement unit (IMU) disposed within or on a moving object, such as a ball or other member, to calculate the kinematics of the moving object.