Gyro Sensor Deformation Analysis with Installation Error Correction

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Solution Overview

Problem

Existing methods for analyzing the deflection and torsion of objects, such as golf clubs, face challenges in achieving high accuracy due to errors in gyro sensor installation angles and difficulties in measuring these errors, leading to inaccuracies in deformation measurements.

Innovation Solution

A motion analysis device with two posture angle sensors attached to a measurement object at distant locations, which detects and corrects differences in posture angles and angular velocities to calculate deformation amounts with high accuracy by accounting for installation angle errors before and during motion.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If gyro sensors are attached to measure deflection and torsion, then deformation measurement is possible, but installation angle errors cause measurement inaccuracy

Engineering Contradiction:

Improvedeformation measurement accuracyVSAvoidmeasurement reliability due to installation angle errors

Core Design Contradiction:

Measurement precisionVSReliability

Solution Approach 1:

The system performs preliminary measurement of installation angle errors before actual deformation measurement. The error measurement unit measures the installation angle errors of gyro sensors relative to the object's coordinate system in advance, and this error data is stored for subsequent correction during actual measurement operations.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system establishes a feedback loop where installation angle errors are measured, corrected, and used to improve subsequent measurements. The error correction unit uses the previously measured installation angle errors to correct the deformation amount calculations, ensuring continuous improvement of measurement accuracy.

Inventive Principle:

Principle #23Feedback

2Adaptability or versatility

If two gyro sensors are attached at distant locations, then deformation analysis is possible, but accurately conforming installation angles becomes extremely difficult

Engineering Contradiction:

Improvedeformation analysis capabilityVSAvoidinstallation angle conformity

Core Design Contradiction:

Adaptability or versatilityVSManufacturing precision

Solution Approach 1:

The system replaces the mechanical requirement for precise manual alignment with an automated error measurement and correction system. Instead of requiring operators to manually align sensors with high precision, the system automatically measures installation angle errors using the sensors themselves and computationally corrects the results.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The gyro sensors serve dual purposes: they both detect the deformation motion and enable measurement of their own installation angle errors. The error measurement unit utilizes the gyro sensors' own readings to determine their installation angle deviations, making the system self-diagnosing and self-correcting without requiring external alignment tools or procedures.

Inventive Principle:

Principle #25Self-service

3Measurement precision

If image analysis method is used, then deformation analysis is possible, but measurement accuracy and data acquisition speed are insufficient

Engineering Contradiction:

Improvedeformation measurement accuracyVSAvoiddata acquisition speed

Core Design Contradiction:

Measurement precisionVSProductivity

Solution Approach 1:

The system replaces optical image analysis with direct mechanical sensing using gyro sensors. The gyro sensors directly detect angular velocity and posture changes, providing immediate numerical data without requiring image capture, processing, or complex image analysis algorithms, thereby significantly improving data acquisition speed.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The system performs preliminary calibration to measure installation angle errors before actual measurement. This preliminary action ensures that subsequent deformation measurements are accurate without requiring repeated calibration or adjustment during data acquisition, maintaining high measurement precision while enabling rapid continuous measurement.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS9026398B2Motion analysis device and motion analysis method for analyzing deformation of measurement object

Publication Date: 2015.05.05 SEIKO EPSON CORP

AI summary

A motion analysis device includes two posture angle sensors attached to a measurement object at locations distant from each other, a data acquisition section, a posture angle correction section, and a deformation amount calculation section. The data acquisition section acquires data of a first posture angle and a second posture angle respectively detected by the posture angle sensors. The posture angle correction section corrects a difference between the first posture angle and the second posture angle after starting a motion of the measurement object in accordance with a difference between the first posture angle and the second posture angle before starting the motion of the measurement object. The deformation amount calculation section calculates a deformation amount of the measurement object based on a difference between the first posture angle and the second posture angle corrected by the posture angle correction section.