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Technical Paper

Optimizing Vehicle NVH Using Multi-Dimensional Source Path Contributor Paradigm.

2018-06-13
2018-01-1542
Automotive Industry is moving towards lightweight vehicle design with more powerful engines. This is increasing a demand for more optimized NVH design. Source-Path-Contributor (SPC) analysis is one of the ways to draw a holistic picture of any NVH problem. In this paper, an NVH problem of low frequency booming noise and steering vibration has been studied in a development vehicle. All three dimensions of SPC paradigm were looked at to propose a feasible and optimized solution at each level of Source, Path and Contributor model. A classical transfer path analysis (TPA) has been done to identify the highest contributing path: transmission mount and suspension arm. Optimization of suspension bush parameter has been carried out using dynamic elastomer testing facility for an improved NVH performance. After identifying source as engine a study of torsional fluctuations due to gas pressure and torsional resonances has been carried out in order to achieve a feasible solution at source.
Technical Paper

Improving Rough Road NVH by Hydraulic Mount Design Optimization

2020-04-14
2020-01-0422
Vehicle cabin comfort creates or emphasizes a specific image of a brand and its product quality. Low frequency power train induced noise and vibration levels are a major contributor affecting comfort inside passenger cabin. Thus, using hydraulic mount is a natural choice. Introduction of lighter body panels coupled with cost effective hydraulic mounts has resulted in some additional noises on rough road surfaces which are challenging to identify during design phase. This paper presents a novel approach to identify two such noises i.e. Cavitation noise and Mount membrane hitting noise based on component level testing which are validated at vehicle experimentally. These noises are encountered at 20~30 kmph on undulated road surfaces. Sound quality aspect of such noises is also studied to evaluate the solution effectiveness.
Technical Paper

Abatement of passenger vehicle judder through optimized engine mounting design

2020-04-14
2020-01-0420
The modern automobile industry has experienced a paradigm shift in recent years. Product sales are no longer driven by manufacturers’ offerings but by the customer expectations. Even budget vehicles strive to offer a superior driving experience so as to distinguish them from competition. Also, there is an enhanced focus on fuel efficiency as regulations are getting more stringent by the day. The focus on fuel efficiency demands the engine idle rpm to be lowered. Also, during vehicle take-off, the engine rpm drops further in case of partial clutch engagement, resulting in sudden vibrations called vehicle judder. This judder phenomenon can be countered either through ECU calibration with additional torque during clutch release, or through engine mount optimization. The former requires additional fuel supply thus reducing fuel efficiency. This paper emphasizes on the latter methodology to contain judder through design modification of engine mounting.
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