Method of and apparatus for predicting vehicle interior noise
US6529838B1 · kind B1 · utility
Assignees
Inventors
Key dates
| Filing date | Jun 16, 1998 |
| Grant date | Mar 4, 2003 |
| Priority date | — |
| Expiry date | Jun 16, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01H17/00
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A jig is successively mounted on each of the four wheels of a vehicle. The jig is struck in three orthogonal directions independently, and at the same time, a microphone inside the vehicle measures the sound pressure of noise generated due to the exciting force. An FFT analyzer operates a frequency response function from the exciting force to the sound pressure. In a drum testing machine, a tire to be subject to noise prediction is mounted on a shaft, the tire is rotated, and the axial force in the three orthogonal directions is measured. The axial force signal is input to the FFT analyzer and the auto power spectrum in the three orthogonal directions and the cross power spectrum between two different axial directions are operated. The frequency response functions are synthesized with the auto power and cross power spectrums, and the power spectrum of the road noise is operated.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.