Mass distribution model-based plantar impact force dynamic estimation method

By collecting triaxial acceleration data using an IMU and combining it with a mass distribution model, the plantar impact force is dynamically estimated, solving the problem of dynamic estimation in traditional methods. This achieves high-precision dynamic impact force monitoring and gait abnormality analysis, and is suitable for daily wear and rehabilitation assessment.

CN120918630APending Publication Date: 2025-11-11XIAMEN FUHUIKANG ELECTRONIC TECH CO LTD
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Patent Information

Application Number
CN202511030065.5
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-07-25
Publication Date
2025-11-11

AI Technical Summary

Technical Problem

Existing technologies make it difficult to dynamically estimate the impact force on the sole of the foot using non-contact devices, especially in daily wear and dynamic monitoring. Traditional methods rely on force platforms or pressure sensors fixed in the laboratory, which cannot meet dynamic requirements, and changes in foot acceleration alone cannot reflect the true force situation.

Method used

An inertial measurement unit (IMU) is used to collect triaxial acceleration. Combined with gait segmentation and mass distribution models, the landing point is identified, the impact acceleration and mass distribution ratio are calculated, the plantar impact force is estimated using the formula F=ma, and the equivalent weight is calculated using a machine learning model without any weight input.

Benefits of technology

It achieves high-precision, dynamic plantar impact force estimation, is suitable for daily wear, and features low cost, convenience, and applicability. It can monitor gait load imbalance trends and provide rehabilitation assessment and abnormality warnings.

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Abstract

The invention discloses a plantar impact force dynamic estimation method based on a mass distribution model, and relates to the technical field of biomechanical measurement, and the plantar impact force dynamic estimation method comprises the following steps: collecting three-axis acceleration of a human leg through an inertial measurement unit; carrying out gait segmentation based on the three-axis acceleration, and recognizing a landing point; a preset number of acceleration sampling points before and after each landing point are extracted, and the average value of acceleration amplitudes is calculated to serve as impact acceleration; based on the current relative gait postures of the two feet, the supporting states of the feet on the side and the opposite side are determined, and the mass distribution proportion is calculated according to the supporting states; estimating the plantar impact force according to a formula F = ma in combination with the impact acceleration and the mass distribution proportion; and outputting the estimated value of the plantar impact force. According to the method, the landing point is obtained through gait segmentation, after the acceleration characteristics are extracted, biomechanical correction is conducted in combination with the leg mass distribution proportion, and higher-precision estimation of the plantar impact force is achieved.
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