Vibration Test Jig with Wire Rope Isolators for Torsion Simulation
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Solution Overview
Problem
Existing vibration test jigs fail to accurately simulate the relative displacement such as torsion or bending of vehicle parts like panorama sunroofs under actual vehicle conditions, leading to discrepancies between single product test results and actual vehicle test results.
Innovation Solution
A vibration test jig incorporating a complex four-articulation link and spring mechanism with double parallelograms and wire rope isolators is designed to generate vertical displacement while restricting other directions, allowing for accurate simulation of torsion or bending similar to actual vehicle conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a fixed jig is used to measure relative displacement of a vibration test object, then the test setup is simple and stable, but the test results differ from actual vehicle conditions and cannot accurately simulate torsion or bending
Solution Approach 1:
The patent applies the dynamics principle by transforming the fixed jig into a movable jig that can dynamically follow the motion of the vibration test object. The jig is equipped with rollers that move along guide rails, allowing it to adapt to torsion and bending movements during vibration testing. This dynamic capability enables accurate simulation of actual vehicle conditions while maintaining measurement precision.
Solution Approach 2:
The patent changes the positional parameters of the jig by allowing it to move freely in the vertical direction and rotate about the vertical axis. These parameter changes enable the jig to accommodate the dynamic deformation modes (torsion and bending) of the vibration test object, thereby improving measurement accuracy without requiring an overly complex fixed structure.
2Reliability
If a movable jig is used to follow the motion of the vibration test object, then accurate simulation of actual vehicle conditions is achieved, but the jig structure becomes more complex
Solution Approach 1:
The patent segments the jig into multiple independent components: a base that moves vertically along guide rails, a body that rotates about the vertical axis, and rollers that facilitate movement. This segmentation allows each component to perform a specific function independently, simplifying the overall structure while achieving the reliability needed for accurate test result simulation.
Solution Approach 2:
The patent introduces rollers as intermediary elements between the jig and the vibration test object. These rollers enable the jig to smoothly follow the motion of the test object without direct rigid contact, reducing structural complexity while maintaining the reliability of motion tracking and test result accuracy.
3Adaptability or versatility
If the jig is constrained in multiple directions, then positional stability is maintained, but the ability to simulate torsion and bending is reduced
Solution Approach 1:
The patent applies local quality by providing different degrees of freedom at different parts of the jig. The base is constrained in horizontal directions but free in the vertical direction, while the body is free to rotate about the vertical axis. This localized freedom of movement allows the jig to simulate torsion and bending modes while maintaining positional stability through controlled constraints.
Solution Approach 2:
The patent uses dynamics by allowing the jig to adapt its constraints based on the vibration test conditions. The movable structure with rollers and rotation capability enables the jig to dynamically adjust its positional and orientational characteristics, providing both stability and adaptability for simulating various deformation modes during vibration testing.
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
This design enables precise simulation of relative displacements like torsion or bending, ensuring that vibration tests accurately replicate actual vehicle conditions, thereby improving the reliability of test results.
Implementation Method 1
a wire rope isolator connected between the upper plate and the lower plate
Implementation Method 2
a displacement causing and displacement restricting unit including a complex four-articulation link and a spring
Data Source
AI summary
A vibration test jig may include an upper jig frame to which a vibration test object is fixed and a lower base frame mounted to an oscillator, and a plurality of double parallelograms connected between the jig frame and the base frame, for generating displacements in an upward/downward direction and/or a forward/rearward direction. Each of the double parallelograms may include a complex four-articulation link structure and a wire rope isolator. The vibration test jig can simulate a deformation mode due to generation of resonances.