Rotatable Base Test Fixture for High-Frequency Vibration Testing
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Solution Overview
Problem
Conventional test fixtures for high-frequency vibration testing of automotive electronic products are less rigid, leading to reduced resonant frequencies and distorted test results due to local modes and excessive supporting components causing unnecessary resonance.
Innovation Solution
A test fixture design featuring a rotatable base located between two mounting bases, with a supporting base fixed on the rotatable base farthest away from the bottom base, enhancing rigidity and preventing local modes, allowing for vibration testing at frequencies higher than 2000 Hz without resonance distortion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional test fixture design is used, then the structure is simpler, but the rigidity is reduced and local modes occur at low frequency
Solution Approach 1:
The test fixture is divided into multiple functional bases: bottom base, mounting bases, rotatable base, and supporting base. Each base serves a specific function and is positioned to optimize the overall rigidity while preventing local modes. The segmentation allows the fixture to achieve high rigidity without excessive complexity in any single component.
Solution Approach 2:
The rotatable base is positioned between the two mounting bases in a spatial arrangement that creates a stable triangular support structure. This dimensional positioning optimizes the moment of inertia and rigidity of the fixture, preventing local modes while maintaining structural efficiency.
2Strength
If excessive supporting components are added to enhance rigidity, then the rigidity improves, but unnecessary resonance modes are caused
Solution Approach 1:
The design removes unnecessary supporting components that would create excessive resonance modes. Only the essential bases (bottom base, mounting bases, rotatable base, supporting base) are retained, each positioned to provide necessary rigidity without creating harmful resonances. This extraction of redundant elements eliminates unnecessary resonance while maintaining adequate rigidity.
Solution Approach 2:
The positioning parameters of the bases are optimized to achieve the desired rigidity. The supporting base is specifically positioned on the side of the rotatable base farthest from the bottom base, which maximizes the moment arm and rigidity while avoiding configurations that would create low-frequency local modes or excessive resonance.
3Reliability
If conventional test fixture is used, then the assembly method is simpler, but the resonant frequency is reduced and test results are distorted
Solution Approach 1:
The fixture is segmented into distinct bases with clear functional assignments, which simplifies the assembly process while ensuring proper positioning. Each base can be assembled and positioned independently, reducing cumulative positioning errors and improving overall assembly precision.
Solution Approach 2:
The rotatable base acts as an intermediary element between the mounting bases and the supporting base. This intermediary structure provides a stable reference frame that ensures precise positioning of the supporting base, thereby improving assembly precision and preventing distortion in test results.
Data Source
AI summary
A test fixture configured to support a DUT (device under test) and including a bottom base, two mounting bases, a rotatable base and a supporting base. The two mounting bases stand on a side of the bottom base and are spaced apart from each other. The rotatable base is rotatably disposed on the two mounting bases. At least a part of the rotatable base is located between the two mounting bases. The supporting base is fixed on a side of the rotatable base and configured to support the DUT. When the supporting base is parallel to the bottom base, the supporting base is located on a side of the rotatable base located farthest away from the bottom base.