Predicting powertrain radiated noise using flexible multi body dynamics

Paper #:
  • 2018-01-1285

  • 2018-04-03
With the increasing competition in small and compact car market, it is important to delight the customer with better features, aesthetics and comfort. Vehicle NVH plays an important role in comfort. Being the main source of noise and vibration, it is important to study engine vibrations and powertrain radiated noise during vehicle development phase. However, during the initial concept stages of the vehicle development it is very expensive and time consuming to get the proto engine for the judgment. One can predict powertrain vibrations & radiated noise using MBD & FEA tools. The objective of the present paper is to evaluate powertrain radiated noise for an inline 3 cylinder engine considering actual engine running conditions.The detailed FE model includes main engine components and transmission components which represents powertrain stiffness & mass distribution. All other smaller powertrain components' mass has been suitably incorporated in the model in form of mass elements. The Engine FE model is then reduced using component mode synthesis in MSC Nastran which is further converted into AVL files using AVL Excite power unit tool. These reduced powertrain components are connected by means of nonlinear joints at bearing locations and wherever there is joint with stiffness. Further engine dynamic loads (p-theta information) at various engine speeds and timing drive loads are considered for calculating real time engine loads. Surface velocities for engine are calculated using these loads which are given to LMS VL for acoustic calculation. This method is used for calculation of engine mount acceleration levels and sound pressure levels. The mount acceleration levels are compared with actual testing levels. The simulation process offers simpler modeling techniques and consideration of real time forces coming from crank train and valve train systems. This procedure helps to calculate engine radiated noise in the concept stages of engine development with cost and time benefit.
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