Wearable Sensor Body Model Calculation via Circular Motion Approximation
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Solution Overview
Problem
Existing motion sensing technologies face challenges in accurately calculating human body motion due to the need for precise sensor mounting, which is difficult to adjust for varying somatotypes, leading to reduced workability and calculation precision when using pre-recorded body models without adjusting the mounting position.
Innovation Solution
A calculation device that calculates the length of a target region on the human body based on measured results from a measurement target region, using state information to determine positions and postures, allowing for the approximation of circular motions and calculation of lengths as radii, thereby enabling the creation of a body model with simple human motions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a pre-recorded body model is used without adjusting sensor mounting position, then workability is improved, but measurement precision deteriorates
Solution Approach 1:
The system performs preliminary acquisition of body model information by having the person perform simple motions before actual work. The calculation device stores the relationship between sensor output and body shape characteristics in advance, creating a personalized body model that can be reused without requiring repeated adjustments of sensor mounting position.
Solution Approach 2:
The invention creates a virtual copy of the person's body model through measurement and calculation. Instead of requiring physical adjustment of sensors to match a standard model, the system captures the individual's actual body characteristics and creates a digital replica that can be used for subsequent measurements, eliminating the need for repeated mounting adjustments.
2Measurement precision
If sensor mounting position is adjusted to conform to body model, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The system performs the complex task of body model acquisition in advance through simple motions. By capturing body shape characteristics during preliminary simple movements, the system eliminates the need for complex adjustment procedures during actual work, storing the calibrated relationship for future use.
Solution Approach 2:
The calculation device automatically calculates and stores the body model information without requiring manual intervention for complex adjustments. The system self-calibrates by processing sensor data from simple motions to generate the personalized body model, reducing the need for operator involvement in complex adjustment procedures.
3Measurement precision
If body model information is acquired through complicated motion, then measurement precision is improved, but productivity decreases
Solution Approach 1:
The system performs body model acquisition as a preliminary step using simple motions rather than complicated movements. The calculation device captures necessary body shape characteristics during these simple preliminary actions and stores the information for subsequent use, eliminating the need for repeated complicated motion sequences.
Solution Approach 2:
The invention creates a digital copy of body model information from simple preliminary motions. Instead of requiring the person to perform complicated motions each time measurement is needed, the system captures the essential body characteristics once through simple movements and uses the digital replica for all subsequent measurements.
Data Source
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AI summary
The present invention provides a calculation device, calculation method, and calculation program with which the length of a target region required for a body model can be determined by means of a simple operation. This calculation device 1 configures a wearable device to start measurement of a region to be measured (S101). After starting measurement of the region to be measured, a worker wearing the wearable device performs an operation such as rotation of an arm, for example. The calculation device 1 acquires measurement information multiple times (S102) in a chronological manner and calculates a body model on the basis of the acquired measurement information (S103-S105). During calculation of the body model, calculation is performed to determine the length of the region to be calculated by approximately determining, using a mathematical method such as the least-squares method on the basis of the plurality of pieces of measurement information acquired chronologically, a circle or sphere having the length from the center of rotation to the region to be calculated as the radius. Then, the calculation device 1 records the calculated body model in a body model recording unit (S107).