Prediction of interior noise by excitation force of the powertrain based on hybrid transfer path analysis

Abstract

In the early design stage of a vehicle, simulation of interior noise is useful for assessment and enhancement of the noise, vibration and harshness (NVH) performance. Traditional transfer path analysis (TPA) technology cannot simulate interior noise since it uses an experimental method. In order to solve this problem, hybrid TPA is employed in this paper. Hybrid TPA uses simulated excitation force as the input force, which excites the flexible body of a car at the mount points, while traditional TPA uses the measured force. This simulated force is obtained by numerical analysis of the finite element (FE) model of a powertrain. Interior noise is predicted by multiplying the simulated force by the vibro-acoustic transfer function (VATF) of the vehicle. The VATF is the acoustic response in the compartment of a car to the input force at the mount point of the powertrain in the flexible car body. The trend of the predicted interior noise based on the hybrid TPA corresponds very well to the measured interior noise, with some difference due to not only experimental error and simulation error, but also the effect of the airborne path.

Excitation force analysis of a powertrain based on CAE technology

“…According to these results, it is carefully inferred that the simulated force based on the CAE technology can also be used for accurate prediction of the interior noise caused by the structure-borne path of the powertrain vibration based on the hybrid TPA. This conclusion is validated and confirmed in the another one of our papers (Kim and Lee, 2008). …”

“…In this paper, the simulation of the excitation force is expanded up to 6th order based on FE modeling and flexible multibody dynamic analysis of the powertrain (Pistek and Novotny, 2005). The other part of this research is related to prediction of interior noise by using the simulated input forces and the VATF of body of a test vehicle (Kim and Lee, 2008). Figure 1 shows the flow chart for the systematic approach to the prediction of excitation forces at mount points of a powertrain.…”

Overview of modern contributions in vehicle noise and vibration refinement with special emphasis on diagnostics

“…According to cylinder pressure and engine rpm, firstly dynamic forces at each mount position are predicted by ADAMS and secondly, noise transfer functions are determined for the prediction of vehicle interior noise [31]. Also, in order to achieve prediction of the interior noise, Kim proposed a hybrid transfer path analysis [32] and Plunt used the same instrument to find and fix NVH problems, especially in the later development stages [33]. Another important application of ADAMS/VIEW software was for the analysis of passengers vibration comfort, according to international standard ISO 2631, through an oscillatory model of intercity bus.…”

Time‐Domain Substructure Transient Vibration Transfer Path Analysis Based on Time‐Varying Frequency Response Functions under Operational Excitations

“…In the following paragraphs, different methods will be discussed based on one simple dynamic model (seen in Figure 1), which is extensively applied in the field of vehicle engineering, such as in the systems of powertrain mounts [40] and vehicle suspension systems [37,38,41].…”