During the MBS Tech Days 2021, Gerwin Pasch from the RWTH Aachen — Institute for Machine Elements and Systems Engineering (MSE) held a presentation called "Using EMBS and Numerical Transferpath Analysis for Optimizing Vehicle NVH".

The NVH behavior of vehicles is a key purchase criterion nowadays. In the novel and alternative drivetrain concepts, tonal excitation sources often pose a challenge in terms of NVH. Validated simulation methods are needed to evaluate the NVH behavior in the early phases of the product development process. This presentation presents a general methodology to describe the drivetrain excitations over the entire sound transmission chain up to the airborne sound at the driver's ear. As an example, the application of the methodology is shown for a tractor with the hydrostatic-mechanical power-split transmission. The application is characterized by tonal excitations from the hydrostatic piston units. The transient system behavior is calculated via using EMBS and a developed force element describing the hydrostatic excitations. In addition, for optimization and target-oriented analysis of EMBS system models, numerical transfer path analysis (NTPA) methods are presented. The application of NTPA for NVH optimization is demonstrated using the tractor example. Measurement results confirm the numerically determined optimization measures.

​​​​​​​Gerwin PASCH, M.Sc., has been leading the Noise Vibration Harshness (NVH) group in the department of "Systems Engineering — Modelling and Simulation" at the Institute for Maschine Elements and Systems Engineering (MSE) since September 2019. In 2016, he began working as a research scientist at the MSE. 
As part of his research, he develops methods and models for analyzing, optimizing, and evaluating noise vibration harshness behavior, NVH for short, of drive trains and vehicles. The research includes calculations using both elastic multi-body simulation and the finite element method and metrological investigations for configuration and validation of components, assemblies, and entire system models. Until 2016, Mr. Pasch studied Mechanical Engineering with a specialization in "Development and Design Engineering" at RWTH Aachen University.

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MBS Simpack Multibody Dynamics Multibody Simulation Motion Multibody System Simulation ​​​​​​​NVH Drivetrain Simpack