Offset Impact Test Rail and Cable Shuttle System
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Solution Overview
Problem
Current vehicle crashworthiness testing systems face challenges in accurately simulating offset frontal impacts, as existing methods struggle to efficiently and reliably position and move test vehicles and deformable barriers to achieve precise collision conditions.
Innovation Solution
A system comprising a rail, cable, shuttles, and a cart, where the cable is moved by a motor to slideably couple the shuttles along the rail, allowing the vehicle and cart to be offset and impacted while the cable's continuous loop and pulley system ensures synchronized movement, with a shock absorber and ramp mechanism to manage the impact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single rail system with cable and shuttles is used to position and move test vehicle and deformable barrier, then the precision and repeatability of offset frontal impact testing is improved, but the device complexity increases
Solution Approach 1:
The patent combines the positioning and movement functions for both the test vehicle and deformable barrier into a single integrated rail system with shared cable and shuttle mechanisms. This merging approach enables precise synchronized movement and offset positioning while reducing the number of independent positioning systems needed, thereby improving measurement precision without proportionally increasing overall system complexity.
Solution Approach 2:
The cable and shuttle act as intermediary mechanisms between the motor drive system and the test objects (vehicle and barrier). The shuttle slidingly coupled to the rail and connected to the cable provides a controlled interface that translates cable movement into precise positional adjustments, enabling accurate offset positioning while isolating the complexity of the positioning mechanism from the test objects.
2Reliability
If the cable is moved by a motor with pulley system to synchronize movement of vehicle and cart, then the reliability of impact testing is improved, but the device complexity increases
Solution Approach 1:
The continuous loop cable system ensures uninterrupted and synchronized movement transmission from the motor to both shuttles throughout the entire testing cycle. The cable remains under tension and continuously engaged with the pulleys and shuttles, eliminating gaps or discontinuities in the motion transmission, which enhances the reliability and repeatability of the impact testing.
Solution Approach 2:
The single cable system performs multiple functions simultaneously: it positions both the test vehicle and deformable barrier, maintains synchronization between their movements, and enables the offset positioning required for frontal impact testing. This multi-functionality reduces the need for separate independent drive systems, improving reliability while managing overall system complexity.
3Productivity
If shuttles are slideably coupled to the rail to move vehicle and cart along a single rail, then the efficiency of crashworthiness assessments is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The shuttles are designed to slideably couple to the rail, providing dynamic movement capability along the rail length. This sliding coupling allows the shuttles to move freely and smoothly to any position required for different impact scenarios, enhancing the efficiency and flexibility of crashworthiness assessments. The dynamic coupling compensates for minor manufacturing variations through the sliding interface.
Solution Approach 2:
The system divides the positioning function into separate modular components: the rail provides the guide path, the shuttles provide the moving platforms, and the cable provides the drive force. This segmentation allows each component to be manufactured and assembled independently, with the sliding coupling between rail and shuttles serving as a tolerance-absorbing interface that reduces the cumulative impact of manufacturing variations.
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 controlled offset frontal impact testing, ensuring accurate and repetitive results by synchronizing the movement of the vehicle and cart along a single rail, enhancing the reliability and efficiency of crashworthiness assessments.
Implementation Method 1
a cart (18) including a connector (20) horizontally spaced from the rail (12)... The first shuttle (16) and the second shuttle (42) are slideable along the rail (12) in a direction toward each other
Implementation Method 2
with a shock absorber and ramp mechanism to manage the impact
Data Source
AI summary
A system for testing an impact of a vehicle includes a rail, a cable moveable along the rail, a shuttle fixed to the cable and slideably coupled to the rail, and a cart. The cart includes a connector horizontally spaced from the rail and a centerline parallel to and horizontally spaced from the rail. An arm is fixed to the shuttle and extends from the shuttle to the connector. The arm is releasably connectable to the connector.