Crash Dummy Chest Calibration via Multi-Condition Force Displacement Analysis
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Solution Overview
Problem
Existing methods for calibrating the chest of a vehicle crash dummy have a single calibration mode, leading to poor accuracy in determining whether the chest meets the biological simulation standard, as they focus on the entire chest rather than individual parts, potentially misclassifying damaged areas as compliant.
Innovation Solution
A method and device using a pressing apparatus with pressure and displacement sensors to simulate various impact conditions on the chest, comparing actual force-displacement curves of the target dummy to standard curves, determining compliance with the biological simulation standard by analyzing differences across multiple test conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single calibration mode focusing on the entire chest is used, then the calibration process is simple, but the measurement precision is poor and may misclassify damaged areas as compliant
Solution Approach 1:
The patent divides the chest calibration into multiple test conditions (first test condition and second test condition), each targeting different aspects of chest performance. The first test condition evaluates overall chest compliance while the second test condition specifically evaluates rib compliance. This segmentation allows for precise identification of damaged areas without requiring complex additional hardware.
2Measurement precision
If multiple test conditions are used to improve calibration accuracy, then the measurement precision improves, but the device complexity increases
Solution Approach 1:
The pressing apparatus is designed to perform multiple functions: it can apply pressing forces under different test conditions (first and second test conditions) using the same basic structure. The apparatus includes a pressing component that can operate in different modes without requiring separate calibration devices for each test condition, thus improving measurement precision while controlling device complexity.
Solution Approach 2:
The patent changes test parameters (pressing force, pressing distance, test conditions) to differentiate between overall chest compliance and rib compliance evaluation. By varying these parameters across different test conditions, the system achieves high measurement precision using a single multi-functional pressing apparatus rather than multiple specialized devices.
Data Source
AI summary
A method for calibrating a chest of a vehicle crash dummy, includes: controlling, under each preset test condition, a pressing apparatus to press down a chest of a target crash dummy with a target pressing speed and a target pressing distance corresponding to the preset test condition, obtaining an actual force-displacement curve under each preset test condition, obtaining a standard force-displacement curve of a chest of a standard crash dummy under each preset test condition, and determining, according to the actual force-displacement curve and the standard force-displacement curve under each preset test condition, whether the chest of the target crash dummy satisfies a biological simulation standard. Through collecting information under various preset test conditions, various complicated conditions of impact on the chest can be more effectively simulated in a crash test by using the method, which improves the accuracy of determining the biological simulation standard.