tailieunhanh - System design for automotive body: Part 2

Continued part 1, System design for automotive body: Part 2 with the content: noise, vibration, harshness; structural integrity; passive safety; behavior of thin wall structures, simplified structural models, measurement of the car body stiffness, biomechanics, simplified models for srash. Invite you to consult the ebook to grasp the content details. | 11 Noise Vibration Harshness When traveling all vehicles are subject to several dynamic excitations. The induced vibration and noise has a number of effects on the vehicle and its occupants ranging from the integrity of the structure to the perception of comfort and driving performance. High levels of vibration and noise tends to reduce comfort the outcome being increased fatigue of the driver that in the long term has an impact on safety. The dynamic excitation induces repeated loads on the structure that reduce its life due to fatigue hence influencing the safety and reliability. Dynamic loads acting on the tires have a negative iiifliienci on thelongitudinaland side slip forces reducing theacneloralions l Iml ctil bn anhinvtdduting I bralgIel and cornering. The retufr is agbin rsducad Sbfety. These are just a few oxiiiiựilcs g. hrw ibcnoise and vibrations influence several aspects that ultimately may atfecl safety. The vibrations Till. nisiir m a vshicle iiivalvi acide range ill hidinaneins ranging from below IHx forwannuvering kinds 1 liia ncil lg k Hz .-ai-ouri . excitations. The effeas x s .el ilqH iidjUtt ant I gh ncWre and toh intenofey of the excitation bii. idsooi. the dynanik- bthaofee oftlie t niebiiaaie II id acoustic cavity inside lhe vehfeIt than niiii gb tha dib di due Io 1 and acoustic resonances. Vibro-acoustic phiu T alien io densified eonside ringi hi1 otx elu oiai frequency ranges. Wfrhreferanct to Fty sIT illn fnhowmg frequency bands can be defined i I g i . . Ride 0-5 Hzl whinhmeludas thelow ftnq .icy licelantiodi e 10 16 16 maneuvers and rigid oedllutloini of Hie s Xsbodn the ousprnsáons. L. Morello et al. The Albomolietbovyi nel. 2 System Design MES pp. 239 363. tpringeraiiiecs 0uiines1Midls . eon 240 11 Noise Vibration Harshness Fig. . Main sources of vibration and noise and indication of the main conventional frequency bands used to classify the vibratory .