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NVH testing using six-degree-of-freedom systems
NVT Team Corporation

Vehicles with minimal interior buzzes, squeaks, and rattles are perceived as having a higher build quality by drivers and passengers. The automotive industry employs six-degree-of-freedom (6DOF) vibration testing to identify, quantify, and mitigate noise sources from components like seats, doors, and dashboards.
In the push to make vehicle interiors quieter, the test system itself must also generate less noise so as not to affect sound measurements. This creates a technical challenge in terms of designing testing equipment and accurately simulating multi-axis road-load data at low ambient noise levels.

Team Corporation’s Cube and Mantis hydraulic multi-axis test systems can accurately replicate and measure vibration levels and other characteristics at exceptionally low noise levels – enabling NVH testing at <40dB, for example – setting a standard for NVH laboratory testing.

To achieve exceptionally low ambient noise while in operation, the vibration test systems employ Team Corporation’s oil-supported ball joints with non-contacting surfaces, delivering direct load path coupling with zero backlash and minimal friction. Team incorporates these components for testing coherence and fidelity. An indirect benefit of using high-precision components is that they generate less noise than competing designs, which often use mechanical joints and bearings.

A Data Physics’ matrix vibration controller monitors the Team Corporation’s multi-axis shaker systems. The matrix multi-axis controller also supports simultaneous multi-shaker operation that leverages continuous control, compensating for cross-coupled dynamic responses from multiple inputs to yield high control accuracy.

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Show date: Automotive Testing Expo China 2020, September 14, 15, 16, 2020, Hall 1, SWEECC, Shanghai, China