Tennis Racket Sensor Integration for Kinematic Measurement
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Solution Overview
Problem
Existing systems for measuring tennis racket movement, such as those using two-axis linear acceleration sensors and triaxial angular speed sensors, fail to provide satisfactory measurements for analyzing player performance effectively.
Innovation Solution
A tennis racket equipped with a vibration sensor, triaxial linear acceleration sensor, and triaxial angular velocity sensor, along with data storage and transmission capabilities, allows for comprehensive measurement of player gestures and strikes, with data recorded and transmitted to analysis stations like computers or smartphones for evaluation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a two-axis linear acceleration sensor and triaxial angular speed sensor are used, then the measurement system is simpler, but the measurement precision is insufficient
Solution Approach 1:
The patent combines a triaxial linear acceleration sensor and a triaxial angular velocity sensor into an integrated sensing system within the racket handle. This merging of multiple sensor types enables comprehensive 3D movement tracking and precise measurement of racket kinematics, resolving the measurement precision issue while maintaining manageable device complexity through integrated design.
Solution Approach 2:
The patent transitions from two-axis to triaxial sensing capabilities, adding the third dimension (depth/Z-axis) to the measurement system. This dimensional expansion allows for complete 3D reconstruction of racket movement trajectories, significantly improving measurement precision for analyzing player gestures and strikes.
2Measurement precision
If multiple sensors and electronic components are added, then the measurement capability is improved, but the weight of the racket increases
Solution Approach 1:
The patent nests the electronic circuit board, sensors, battery, and data storage components within the existing hollow handle structure of the racket. This nesting approach accommodates multiple functional components without significantly increasing the external dimensions or weight of the racket, as elements are integrated into the existing handle volume.
Solution Approach 2:
The patent employs a flexible printed circuit board to connect the sensors, battery, and data processing elements within the handle. This flexible circuitry allows for compact arrangement of electronic components in limited space, reducing the overall weight compared to rigid wired connections while maintaining electrical connectivity for data acquisition and transmission.
3Adaptability or versatility
If electronic components are integrated into the handle, then the measurement function is achieved, but the mechanical strength is reduced
Solution Approach 1:
The patent segments the electronic components (sensors, circuit board, battery) into a separate removable module housed within the handle. This segmentation allows the electronic assembly to be independently installed and removed without compromising the structural integrity of the racket frame and handle, maintaining mechanical strength while enabling measurement functionality.
Solution Approach 2:
The patent introduces a removable housing or case as an intermediary structure between the electronic components and the racket handle. This intermediary housing protects the electronic components from mechanical stress and environmental factors, while its removable design allows easy installation and maintenance without permanently weakening the racket structure.
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 accurate analysis of player performance parameters, including vibration, angular speed, and linear acceleration, providing detailed insights into technique improvement while maintaining a lightweight and mechanically strong design with sufficient autonomy.
Implementation Method 1
a vibration sensor
Implementation Method 2
a triaxial linear acceleration sensor
Implementation Method 3
a triaxial angular velocity sensor
Data Source
Figure 1
Figure 2
Figure 3
AI summary
The invention relates to a tennis racket. Said tennis racket includes a head including a frame surrounding a netting of string, a holding handle (2), as well as a vibration sensor (14.1), a triaxial linear acceleration sensor (14.2), and a triaxial angular speed sensor (14.3).