Inertial Sensor Correlation for Golf Swing Analysis
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Solution Overview
Problem
Existing exercise analyzing devices require attachment to multiple golf clubs, reducing user convenience as they need to be constantly switched or replaced during a golf round.
Innovation Solution
An exercise analyzing system that includes a first inertial sensor attached to the user and a second inertial sensor attached to a golf club, generating reference information on the correlation between their outputs, allowing the system to estimate the second inertial sensor's output from the first when the second is not used, enabling accurate swing analysis without the need for continuous attachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If an exercise analyzing device is attached to each golf club to enable accurate swing analysis, then measurement precision is improved, but device complexity and ease of operation deteriorate due to the need to attach or replace devices for each club
Solution Approach 1:
The exercise analyzing device is designed to function universally across multiple golf clubs. A single device can analyze swings for different clubs by attaching to the user's body (wrist or torso) rather than requiring separate devices for each club. The device adapts to different clubs through correlation-based estimation, making one device serve multiple purposes.
Solution Approach 2:
The device creates a correlation model (reference information) that copies the relationship between body motion and club motion. This reference information allows the device to estimate club swing characteristics from body sensor data alone, eliminating the need for physical attachment to each club while maintaining analysis accuracy.
2Measurement precision
If an exercise analyzing device is attached to each golf club to enable accurate swing analysis, then measurement precision is improved, but device complexity worsens due to managing multiple devices or attachments
Solution Approach 1:
The device performs multiple functions: it directly measures swings when attached to a club, and estimates swings when attached to the user's body using correlation models. This multi-functionality reduces the need for multiple specialized devices while maintaining measurement precision across different scenarios.
Solution Approach 2:
The correlation model (reference information) acts as an intermediary that bridges body sensor data and club swing characteristics. This intermediary allows accurate estimation without direct physical connection to the club, simplifying the system architecture while preserving measurement accuracy.
3Measurement precision
If the second inertial sensor is continuously attached to the golf club during a round, then measurement precision is improved, but ease of operation worsens due to constant attachment requirements
Solution Approach 1:
The correlation model (reference information) is established in advance during practice sessions when the device is attached to the club. This preliminary action creates a mapping between body motion and club motion that can be reused during actual play, eliminating the need for continuous attachment while maintaining accuracy.
Solution Approach 2:
The device copies the club swing characteristics through the correlation model, allowing accurate estimation during golf rounds without physical attachment to the club. The reference information captures the essential relationship between body and club motion for later reproduction during play.
Data Source
AI summary
An exercise analyzing device (a swing analyzing device) includes an acquiring section (a data acquiring section) configured to acquire an output of a first inertial sensor (an acceleration sensor and an angular velocity sensor) attached to a body of a user and an output of a second inertial sensor (an acceleration sensor and an angular velocity sensor) attached to an exercise instrument (a golf club), an analyzing section (a swing analyzing section) configured to analyze a correlation or a similarity degree between the output of the first inertial sensor and the output of the second inertial sensor and generate reference information, and an output processing section configured to estimate, when the second inertial sensor is not used, the output of the second inertial sensor from the output of the first inertial sensor and the reference information.