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A New Fixture Used for NVH Alpha Cabin Test Disclosure Number: IPCOM000245550D
Publication Date: 2016-Mar-16
Document File: 2 page(s) / 341K

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A New Fixture Used for NVH Alpha Cabin Test

NVH is one of key properties for vehicle performance. For most of soft trim parts (like dash inner insulation, etc.), the part level NVH test usually need sheet metal buck for supporting. We firstly get the vehicle sheet metal buck, then ship it to testing site (roughly 15days). After Cutting (roughly 7 days), we get the sheet metal part. Then start to do the test. The test process is cost and time consuming. Because the test started very late, it will have potential risk for production milestone.

A method is proposed to use Glass Fiber-Reinforced Plastic (GFRP) to replace traditional sheet metal.

  GFRP is a composite material made of a polymer matrix reinforced with glass fibers. It is light but hard. Also, it has stable property and low acoustic absorption coefficient. Thus it is most approximately NVH test fixture comparing with traditional sheet metal.Use GFRP material, the NVH test can be started at very early time. Lower the test risk.


Use the dash outer upper insulator (one NVH part) as an example to do the test. Traditional approach is tested with sheet metal buck in Alpha cabin. The new approach is tested with GFRP. The test result shows NVH curves are very well matched. Test result is good.

Traditional Approach

New Approach

Glass Fiber-Reinforced Plastic (GFRP) Manufacturing Process

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Manufacturing Step 1(8 days): A waxy foam block is milled by CNC according to sheet metal 3D CAD data;