Soft Robotic Sensor Motion Capture Drift Elimination
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Solution Overview
Problem
Current wearable motion capture systems using inertial measurement units (IMUs) face challenges such as distortion, drift, and calibration issues due to magnetic interference and skin movement, limiting their accuracy and practicality for real-world applications, especially in environments involving contact sports or complex joint movements like the ankle.
Innovation Solution
The use of soft robotic sensors integrated into wearable garments, such as socks, which utilize resistive, capacitive, or inductive materials that provide accurate kinematic and kinetic data by capturing biomechanical strain and eliminating drift, allowing for precise measurement of tri-planar ankle joint movements through optimized sensor placement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If inertial measurement units (IMUs) are used for wearable motion capture, then movement information can be captured outside the lab, but distortion and drift occur due to magnetic interference and skin movement
Solution Approach 1:
The patent extracts and removes the magnetic sensor component from the IMU system that causes distortion and drift. By eliminating the magnetometer while retaining accelerometers and gyroscopes, the system achieves both portability and improved measurement accuracy by taking out the harmful element responsible for magnetic interference
Solution Approach 2:
The patent applies local quality by using different sensor types at different locations on the body. Soft robotic sensors are placed specifically at joint locations to capture local biomechanical strain, while traditional IMUs are used elsewhere. This localized approach allows the system to maintain portability while improving measurement precision at critical joint locations
2Measurement precision
If traditional optical motion capture systems are used, then gold standard precision measures are achieved, but the technology is confined to laboratory settings with limited accessibility
Solution Approach 1:
The patent replaces the complex optical mechanical motion capture system with wearable electronic sensors. Soft robotic sensors integrated into garments substitute for optical markers and cameras, while IMUs replace motion capture cameras. This substitution maintains measurement precision for joint angle detection while dramatically improving accessibility by enabling use in real-world environments outside the laboratory
Solution Approach 2:
The patent creates a universal wearable sensor system that can be used across multiple settings (laboratory, field, home) and multiple applications (rehabilitation, sports, daily activities). The soft robotic sensors and IMUs are designed to work in diverse environments, making the precision measurement capability universally accessible rather than confined to specific laboratory conditions
3Ease of manufacture
If IMU-based systems are used for motion capture, then lower-cost alternative is provided, but calibration challenges and frequent adjustment are required
Solution Approach 1:
The patent applies preliminary action by performing calibration procedures before actual use. The system includes pre-programmed calibration routines that guide users through initial setup and positioning. By completing calibration in advance, the system reduces the need for frequent adjustments during operation, making the low-cost IMU-based system easier to operate while maintaining affordability
4Measurement precision
If soft robotic sensors are integrated into wearable garments, then accurate kinematic data is captured without drift, but device complexity increases
Solution Approach 1:
The patent merges multiple sensor types (soft robotic sensors, accelerometers, gyroscopes, and potentially magnetometers) into an integrated wearable system. By combining these components into a unified garment-integrated platform, the system achieves accurate drift-free measurement of joint angles while managing complexity through unified design and centralized data processing
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
The system provides accurate, real-time kinematic and kinetic data, reducing noise and interference, and offering actionable feedback on joint movement and risk assessment, enhancing the reliability and comfort of wearable technology for athletes and rehabilitation purposes.
Implementation Method 1
resistive, capacitive, or inductive materials that provide accurate kinematic and kinetic data by capturing biomechanical strain
Implementation Method 2
resistive, capacitive, or inductive materials that provide accurate kinematic and kinetic data by capturing biomechanical strain
Implementation Method 3
resistive, capacitive, or inductive materials that provide accurate kinematic and kinetic data by capturing biomechanical strain
Data Source
AI summary
The present design provides a novel system and device for wearables for humans and animals that capture and store kinematic and kinetic data and movement during training, rehabilitation, real-time events, and the like, analyze such data and movement in real-time during and after such activities, and provide output, feedback, assessment, and actionable biomechanical data and information about the wearer.