Posture Control Using Sway Spectrum Peaks for Fatigue Detection
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Solution Overview
Problem
Existing methods for determining the state of a person's body are not precise and complex, making it difficult to assess fatigue levels and maintain posture effectively, especially in high-stress environments like construction sites.
Innovation Solution
A determination device that utilizes a sway detector to analyze sway data, deriving the positions of the body's three-dimensional centers of gravity and employing stable resonation phenomena to determine the state and fatigue level of a person, and a posture control device to maintain balance by controlling the sway of these centers of gravity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional methods are used to determine body state and posture, then measurement can be performed, but measurement precision and determination accuracy are insufficient
Solution Approach 1:
The invention segments the body into three distinct center of gravity points (head, torso, hips) and analyzes their sway independently. By dividing the complex body posture analysis into three separate COG tracking tasks, the system achieves higher measurement precision for each segment while maintaining manageable device complexity through modular sensor placement and individual spectral analysis of each COG.
2Measurement precision
If multiple sensors are added to improve determination precision, then measurement accuracy improves, but device complexity increases
Solution Approach 1:
The invention uses a universal sway detector that can detect the sway of all three centers of gravity (head, torso, hips) simultaneously through a single detection device. This multi-functional approach eliminates the need for separate sensors for each body segment, achieving high measurement precision while keeping the device complexity low by using one versatile sensor system rather than multiple specialized sensors.
3Manufacturing precision
If complex control configurations are used to maintain posture, then posture control precision improves, but ease of operation deteriorates
Solution Approach 1:
The invention implements a feedback mechanism where the spectral analysis results of the three centers of gravity are continuously monitored and used to adjust posture control in real-time. The controller receives spectral information about COG sway and automatically adjusts positioning to maintain optimal posture, achieving high control precision through simple spectral-based feedback rather than complex control algorithms.
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
Enables precise and simplified determination of a person's state and fatigue level, and maintains posture by utilizing stable resonation of the body's centers of gravity, reducing the need for additional sensors and simplifying control configurations.
Implementation Method 1
a sway detector 10 that detects sway of a person when the person moves; an angular velocity sensor that detects an angular velocity of sway of the person in a horizontal direction orthogonal to a direction in which gravitational force is exerted
Implementation Method 2
The determination device performs spectrum analysis by resolving sway data outputted from the sway detector into frequency components
Implementation Method 3
utilizing stable resonation phenomena to determine the state and fatigue level of a person
Data Source
Figure 1
Figure 2A~2B
Figure 3A~3B
AI summary
A determination device (100) includes: a sway detector (10) that detects sway of a person when the person moves; and a controller (20). The determination device (100) performs spectrum analysis by resolving sway data outputted from the sway detector (10) into frequency components. In a spectrum obtained from the spectrum analysis, a first peak, a second peak, and a third peak sequentially appear in order of increasing frequency. The controller (20) determines a state of a body of the person based on the first peak, the second peak, and the third peak.