Application of the Momentum Algorithm for Active Noise Control
-Fast Convergence for the HVAC Compressor Noise in an Autonomous Bus-

Seongyeol Kim･Junseok Choi･Doyeon Kim･Sang-Kwon Lee (Inha University, Department of Mechanical Engineering)

This paper presents an ANC algorithm to reduce vibroacoustic noise from the HVAC compressor in an autonomous bus. The compressor generates high-frequency noise due to shell vubrations, with dominant frequencies in the 100-600Hz range, impacting passenger comfort. While the FXLMS algorithm is commonly used, it struggles with nose outside peak frequencies. To improve performance, a momentum algorithm was applied, offering faster convergence and lower residual error. The results demonstrate significant noise reduction both at peak frequencies and across a wider frequency range, enhancing passenger comfort.

eNVH Analysis of a PM Motor with Uneven Magnetization and Rotor Eccentricity

Rabah Hadjit (ESI)･Sumeet Singh (EM Works)･Mario Felice (virsolTech Engineering Consulting, LLC)

This paper investigates the electromagnetic performance, and NVH characteristics of a forty eight-slot and eight-pole interior permanent magnet motor designed for automotive applications. Utilizing advanced virtual modelling and simulation techniques, the study conducts a comparative evaluation of rotor configurations with even and uneven magnetization under varying eccentricities - static, dynamic, and mixed. The resultant radial and tangential electromagnetic forces are then compared for their contributions to surface velocities and noise radiation.
This methodology provides a comprehensive understanding of how magnetization and allows minimizing noise and vibration while maximizing performance in automotive applications.

Impact of Vibration Applied to the Vehicle by the Hub Nut Clamp Type Vehicle Restraint Device (Second Report)

Toshimichi TAKAHASHI･Toshinari KOZEKI (Meidensha)･Masao FURUSAWA (F-MA Consulting)

The previous report showed that the eccentric hub nut flange excited the upper center pithing mode which was not appeared on the actual driving on the road. This report explains the theoretical back ground of this pithing mode, then the counter measure was done by installing the damper unit to the place of antinode of the pithing mode even in a case of difficult concentricity of the hub nut flange.