AUTOMOTIVE POWERTRAIN NVH (NOISE, VIBRATION HARSHNESS) EVALUATION LEVERAGING CO-SIMULATION

摘要

OEMs rely on a diverse set of simulation software codes to best model the inherent operating physics (i.e., mechanical, fluid, controls, etc.) of components & subsystems. These component and subsystem models would need to be evaluated together in order to correctly assess their interactions and full system effects. Functional Mock-up Interface (FMI) is an emerging open standard interface for coupling two or more simulation tools. The FMI open standard is an effective way of sharing and integrating component and subsystem models using simulation tools from different software vendors. Currently two modes of coupling defined by FMI: co-simulation and model exchange. This paper will focus on the co-simulation mode. The FMI standard for co-simulation has now been implemented in multiple software codes, including Adams, a multi-body dynamics code for system simulation. Ford Powertrain is using a number of "niche" simulation tools to model the various subsystems of drivetrains and there is a growing need to integrate these together to perform system simulation for evaluating the NVH (Noise, Vibration & Harshness) performance with better model predictions. A joint research case study of how FMI couples two simulation codes to evaluate effects of transmission performance on the overall NVH of a drivetrain system will be presented. This paper will showcase how Adams 3D mechanical system models were used along with 1D AMESim models to execute the co-simulation. An Adams full vehicle model including detail drivetrain components is integrated with an AMESim transmission controller model to simulate the overall vehicle transient NVH response due to the engine torque excitation. This CAE approach will be used to best balance drivetrain transient NVH with fuel economy requirements. This presentation will highlight the co-simulation process as well as how it can be used to evaluate the various aspects of NVH for automotive powertrains.