Tor­sion­al Vibra­tion Mea­sure­ments and Analy­sis on E‑powertrain

Inves­ti­ga­tions on elec­tric pow­er­trains present engi­neers with new chal­lenges as tor­sion­al vibra­tions from elec­tric motor and gear­box result in noise prob­lems and might lead to mechan­i­cal fail­ures. Com­bin­ing the dynam­ic mea­sure­ment of tor­sion­al vibra­tion, ana­log sen­sor val­ues, CAN / OBD data as well as cur­rent and volt­age probes enables an over­all analy­sis of the elec­tric pow­er­train.

In order to iden­ti­fy and local­ize the dynam­ic tor­sion­al vibra­tion exci­ta­tions and the noise sources of an elec­tric pow­er­train, it is equipped with ROTEC high-res­o­lu­tion speed sen­sors and high-fre­quen­cy speed mea­sure­ment boards with a 12.3 GHz clock. Typ­i­cal mea­sure­ment points are e‑motor, trans­mis­sion input and out­put shafts. The high clock fre­quen­cy allows to detect the dynam­ic angu­lar dis­place­ment between two shafts in µrad range and, for exam­ple, to ana­lyze the noise-induc­ing trans­mis­sion error between two gears. In addi­tion, micro­phones and accelerom­e­ters are placed in the engine com­part­ment and driver’s cab. For NVH inves­ti­ga­tions ROTEC offers high-res­o­lu­tion ana­log mea­sure­ment boards with IEPE chan­nels and spe­cial NVH fea­tures in the analy­sis soft­ware. Cur­rent and volt­age mea­sure­ment probes from KLAR­IC are applied to the bat­tery, DC charg­ing, on board charg­er, HV PTC and HV ECC. CAN sig­nals are record­ed at the CAN / OBDII inter­face, e.g. throt­tle and brake posi­tion. The record­ed mea­sured val­ues are eval­u­at­ed in the time and spec­tral domain.

ROTEC ENGI­NEER­ING sup­ports you with expert engi­neer­ing knowl­edge in prob­lems relat­ed to vibra­tion analy­ses on engines, trans­mis­sions and pow­er­trains. With our know-how, we make a valu­able con­tri­bu­tion to your prod­uct in the areas of con­trol dri­ve val­i­da­tion, valve train opti­miza­tion, clutch design,  trans­mis­sion error (TE), trans­mis­sion opti­miza­tion, oil sup­ply opti­miza­tion, pow­er­train mea­sure­ment and opti­miza­tion, mea­sure­ment tech­nol­o­gy appli­ca­tion.