Application of CAE Techniques to Reduce Powertrain Vibrations 2003-28-0004
One of the challenges a powertrain designer has to face during design of its structure is the bending / torsional mode vibrations of powertrain assembly. This aggravates other concerns such as shift lever vibrations, shift lever rattle, rise in in-cab noise, generation of booms at certain speeds, etc. Powertrain modal frequencies generally fall beyond 100 Hz and may get excited during normal engine operation depending on type of engine, no. of cylinders, strokes (2 stroke or 4 stroke) and max. operating RPM. Proper care needs to be taken in order to ensure that these modes are not excited by normal operation of the engine.
Conventionally, stiffness of the structure of powertrain is modified such that modal frequencies of the structure are moved out of operating range of engine RPM. This sometimes leads to increased weight of the structure and requires higher development time and cost.
Paper discusses the origin of the problem, conventional solutions of modifications and CAE techniques to simulate the powertrain vibration behavior to solve the problem.