NVH-MEa­sure­ments — Noise, Vibra­tion, Harsh­ness

Prob­lem: Audi­ble and per­cep­ti­ble vibra­tions

Goal: Increase in ride com­fort

The noise and vibra­tion behav­ior (NVH = Noise, Vibra­tion, Harsh­ness) of vehi­cles is increas­ing­ly becom­ing the focus of atten­tion in auto­mo­tive devel­op­ment regard­ing ride com­fort. This refers to all audi­ble and per­cep­ti­ble vibra­tions com­ing from the chas­sis, pow­er­train and wheels that affect com­fort. Bat­tery-pow­ered dri­ves pose a par­tic­u­lar­ly great chal­lenge in this respect, since there is no com­bus­tion engine to mask the oth­er dri­ve nois­es and these can be per­ceived more eas­i­ly as body or air­borne noise. Sev­er­al effects can be named as the cause of the dri­ve noise. Thus, exci­ta­tions from the dri­ve side can occur, which are caused by the elec­tric motor, the gear trans­mis­sion or by the dri­ve shafts. Cer­tain com­po­nent groups can react to these struc­ture-borne noise exci­ta­tions with nat­ur­al vibra­tions and addi­tion­al­ly wors­en the NVH behav­ior.

To mea­sure and eval­u­ate vibra­tions, rota­tion­al speeds are record­ed at the tor­sion­al vibra­tion-excit­ing com­po­nents. At the same time, struc­ture-borne sound sig­nals are record­ed with an accelerom­e­ter and micro­phones and then joint­ly eval­u­at­ed in the order and fre­quen­cy ranges. ROTEC offers high-res­o­lu­tion ana­log mea­sure­ment boards with ICP inputs and spe­cial NVH fea­tures in the analy­sis soft­ware for NVH inves­ti­ga­tions.

The record­ed mea­sured val­ues are eval­u­at­ed in the time and spec­tral domain. The acoustic behav­iour is also ana­lyzed.

Fur­ther­more ROTEC ENGI­NEER­ING pro­vides you with sup­port and tech­ni­cal engi­neer­ing know-how for prob­lems relat­ed to vibra­tion analy­sis of engines, trans­mis­sions and dri­ve trains. With our know-how, we make a valu­able con­tri­bu­tion to your prod­uct in the areas of tim­ing gear val­i­da­tion, valve train opti­miza­tion, clutch design, trans­mis­sion errors (TE), trans­mis­sion opti­miza­tion, oil sup­ply opti­miza­tion, pow­er­train mea­sure­ment and opti­miza­tion, cur­rent and volt­age analy­sis, and the appli­ca­tion of mea­sure­ment tech­nol­o­gy.