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Download Automotive NVH Technology by Anton Fuchs, Eugenius Nijman, Hans-Herwig Priebsch PDF

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By Anton Fuchs, Eugenius Nijman, Hans-Herwig Priebsch

This ebook provides seven chapters reading chosen noise, vibration and harshness (NVH) themes which are hugely proper for automobile car improvement. those contain purposes following the key developments towards elevated passenger convenience, motor vehicle electrification and light-weight layout. The authors of the seven chapters, all of that are specialists from the car and academia, current the main demanding situations and power options during this challenging box. between others, purposes for sound optimization in downsized engines, noise optimization in electrical powertrains, weightloss techniques for exhaust structures, porous fabrics description, and the vibro-acoustic research of geared structures are discussed.

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Moreover, subjective evaluation of the drivability considering dynamic handling aspects exhibit improved results without modifications on the vehicle itself but solely acoustically supporting a four-cylinder sound in the passenger cabin. Conducted experiments partly took place at public transport routes under normal road traffic conditions and at a special dedicated test track. 9 TwinAir Turbo with 82hp built in 2009. 2 Sound Optimization for Downsized Engines 15 Fig. 1 Measured sound pressure spectra in passenger cabin.

Examining the measured sound pressure level at the driver position for various run-ups, considering different gears and loads, attested a huge variability of the transfer function from the engine to the car interior (cf. Fig. 2). As a consequence, in order to perform a reliable ANC system, the coupling of the gearbox and the powertrain has to be considered in real time applications. Moreover, different operating and occupation states will result in different transfer functions as well. If these states are not considered in the ANC coefficients, noise boost can occur, cf.

In [5], basic coherences between engine orders and elements of music are discussed. Sound attributes and perceived timbre in regard to consonant and dissonant are treated considering engine order intervals and related harmonics. In addition, it has to be mentioned that the amplitude distribution of engine orders mainly determine the perceived pitch of the overall sound [6]. In regard to reduce the fuel consumption the optimal theoretical gear change should happen at around 2000 revolutions per minute (rpm).

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