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Erschienen in:
2020 | OriginalPaper | Buchkapitel
Using 3-Dimensional Transfer Path Analysis to Predict the In-vehicle Electrical Power Steering Noise Performance from Wheel-to-Wheel Rig Measurements
verfasst von : Charbel Massoud, Yuriy Kandinov
Erschienen in: Automotive Acoustics Conference 2019
Verlag: Springer Fachmedien Wiesbaden
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Abstract
During the development of an Electric Power Steering system (EPS), it is critical that NVH is incorporated early in the development to mitigate noises that the end customer will find objectionable (roughness, whine … etc.) before start of production. This includes the determination of critical noise rating drivers and propagation of noise to the driver’s ear through several vehicle tests. However, early in development, vehicles are not easily available, making it difficult to identify significant noise concerns. Because of this, it is critical that predictive methods are used. This can be done with a proper vehicle acoustic model being provided either by the OEM or by Transfer Path Analysis (TPA) conducted on a representative vehicle.
TPA has been used heavily throughout the automotive industry as a method for understanding the propagation of noises from the noise source to the driver’s ear for several different automotive systems. However, conducting a TPA on an EPS at the vehicle level presents a challenge in visualizing and interpreting the data since a continuous speed sweep is not possible to cover the entire operating speed range of the EPS. Typically, several lock-to-lock iterations at different operating speeds need to be conducted to cover all operating conditions and results in several 2-dimensional plots to present and interpret. The approach of using 3-Dimensional Transfer Path Analysis improves the presentation and interpretation of Transfer Path Analysis for EPS Systems in the following ways:
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Reduce the analysis time effort by nearly 90 %
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Improve the resolution of the plots from 15 rpm to 0.5 RPM
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Allow for clear identification and tracking of orders which was not possible before
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Allows for in-vehicle SPL prediction in the same format as the standard in-vehicle test
Once a verified model is complete, it can be demonstrated that with force measurements from the ZF Wheel to Wheel Rig, where forces are measured directly, the in-vehicle noise performance of an EPS system can be predicted.
This approach significantly reduces the dependency on a vehicle by making it possible to identify noise risks from the simplicity of a bench test.