Development of evaluation techniques and investigation of generation mechanisms in vehicle exterior noise from tyres.

Kotaro Mune･Ryuichi Tanimoto (SEKISO Co.Ltd.)

Tyre noise control is a major issue for Phase 3 of the exterior noise regulation. In order to analyse this exterior noise, a towing trailer type tyre noise measuring device was manufactured and a source investigation was carried out. Next, the noise emitted from the tyres was mapped. From these results, it was found that the exterior noise could be reduced by separating the direction of sound radiation from the front and rear wheels.

Construction of PBN (Pass-By Noise) Model Using MBD (2)
-Construction of PBN model linkage to a HEV 1D system model to improvement acceleration performance-

Shinta Nakazawa･Go Endo･Hiromu Iwase･Kenichiro Ogata･Kazuya Chinda (Honda Motor)

Pass-By noise regulations are continually being strengthened, restricting ENG rotation speed to reduce noise levels. This limits the freedom to set ENG rotation speed, contrary to acceleration performance. Therefore, we investigated the construction of a Pass-By Noise model that works in conjunction with the HEV 1D system model. This will expand the freedom to set ENG rotation speed, contributing to improved acceleration performance.

A Hybrid BEM-SEA Approach to Assess and Mitigate AVAS-Induced Cabin Noise: Balancing Safety and Comfort

Robert Fiedler･Massimiliano Calloni (ESI)

Acoustic Vehicle Alerting Systems are primarily designed to comply with international regulations and enhance the safety of vulnerable road users. However, the impact of AVAS on the interior acoustic comfort of vehicle occupants is often overlooked. This study presents a hybrid Boundary Element Method and Statistical Energy Analysis approach to predict interior noise levels resulting from AVAS operation. The BEM model simulates the exterior noise generated by the AVAS, while the SEA model evaluates its transmission into the vehicle cabin, considering the effects of noise control treatments. The methodology assesses and mitigates AVAS cabin noise, balancing safety, and occupant comfort.

Fast estimation method for vehicle NVH sensitivity variation range due to component tolerances

Hiroyuki Nagashima･Satoshi Hoshika･Masashi Okuno･Shigemitsu Takahashi･Hisayoshi Matsuoka (Nissan Motor)･Hirotaka Uchimura (CDH-Japan)

In order to analyze vibration noise taking component tolerances into account, it is necessary to calculate a large number of combinations of component conditions within the tolerance range and to perform contribution analysis using statistical analysis. In this study, we report that it is possible to quickly analyze vibration and noise tolerance variations by combining a fast solution method using modal linear approximation and the probability distribution of component characteristics.

Virtual Mount Design Framework for Component-Based TPA

Domenico Minervini･Andrea Serni･Theo Geluk (Siemens Digital Industries Software)

The widespread electrification in the automotive sector introduces challenges in noise, vibration, and harshness (NVH) characterization due to higher frequency ranges and stiffer bushings. Current mount testing methodologies fail at higher frequencies due to resonances in the test rig, often requiring time-intensive setups. This work presents a novel hybrid approach using high frequency measurements to identify a parametric finite element mount model. This method eliminates the need for support structures, extending the frequency range and enabling design modifications through parametric design. Results match the accuracy of traditional methods while considerably reducing the overall effort, allowing virtual prototyping.

Operational 6 DOF contribution analysis method employing virtual point transformation
-Contribution analysis application to simple vehicle model-

Junji Yoshida･Kenta Hara (Osaka Institute of Technology)

In this study, we considered a combined method of virtual point transformation and operational TPA to understand contribution of 6 DOF input force at a point, where direct measurement is hard such as inside of a structure, to the response point. We then actually applied the combined method to a simple vehicle model and attempted to obtain the 6 DOF contribution at the center of the motor to the floor as the response point.