Stochastic Analysis of Power Train Rigid Body Modes 2006-01-2782
This work is focused on the computer aided engineering noise and vibration control area (CAE-NVH), which is one of the most important in the automobile industry. The reason for that relevancy is that the noise and vibration effects can be directly perceived by the costumer. The vibration of the seats and steering wheel, as well as audible noises are some examples of factors that can cause discomfort to the driver.
During the early design of a car, the systems are designed in a way to reach a good modal management level in order to avoid resonance problems. The finite element models, used to predict these resonances, are normally generated using only deterministic values for the model parameters such as stiffnesses, thicknesses and masses. However, these properties have an uncertainty due to the manufacturing process which is, in most cases, not taken into consideration during the design.
The non-observance of these uncertainties can mask some problems that might occur in the end of the process generating additional costs and unexpected results.
In this paper the influence of the manufacturing uncertainty of engine mount bushings on the power train body modes is addressed. The manufacturing uncertainties are obtained by means of statistical methods.