Automated Identification of NVH- Phenomena in Vehicles Research

Format:

Conference/Event

Author/Creator:

Albert, Albert, author.

Contributor:

Schwarz, Alexander

Conference Name:

SAE 2011 Noise and Vibration Conference and Exhibition (2011-05-16 : Grand Rapids, Michigan, United States)

Language:

English

Physical Description:

1 online resource

Place of Publication:

Warrendale, PA SAE International 2011

Summary:

The NVH (Noise Vibration Harshness) behavior of modern vehiclesbecomes more and more important - especially in terms of newpowertrain concepts, like in hybrid electric or full electricvehicles. There are many tools and methods to develop and optimizethe NVH behavior of modern vehicles. At the end of the developmentprocess, subjective ratings from road tests are very important. Forobjective analyses, different approaches based on artificial neuralnetworks exist. One example is the AVL-DRIVE system, adriveability analysis and benchmarking system which allows, basedon a very small set of sensors, an adequate objective rating of thevehicle's driveability. The system automatically detectsdriving maneuvers and rates the driveability.This article presents a method which is able not only to ratedifferent maneuvers and the behavior of the vehicle but also todetect phenomena and causes in the domain of NVH. In terms ofeffort, one main requirement was to use the same sensor set as thedriveability evaluation system and no additional equipment.Basis for the method is a large database consisting of about 104NVH phenomena. In this database the causes and phenomena are linkedto concrete driving maneuvers. That is permissible because mostphenomena can only occur within one specific maneuver. One exampleis the so-called CLONK (powertrain phenomenon), which only appearsduring a load change. The phenomena are identified by usingpatterns of characteristic frequency ranges. So the userautomatically gets the rating on the one hand and information aboutpossible causes on the other.This method will be illustrated by the examples of the hummingof the climatic compressor and the coolant pump as well as thevibrations during the restarting of the combustion engine in ahybrid test vehicle. Basis for the validation of this method isdata from experiments on the track and the acoustic roller testbench at the IPEK - Institute of Product Engineering Karlsruhe

Notes:

Vendor supplied data

Publisher Number:

2011-01-1656

Access Restriction:

Restricted for use by site license