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.

ハブナットクランプ式車両拘束装置が車両に与える振動の影響（第2報）

高橋　利道・河関　年成（明電舎）・古澤　政生（F-MAコンサルティング）

前報では，ハブナットフランジの偏心により，実路走行中には存在しない上心ピッチングモードが励起されることを明らかにした．本報では，その理論背景を解説し，偏心を完全に取り除けない場合でも，上心ピッチングモードの腹の部位に制振ダンパーを取り付けることで，実用上十分に振動低減ができることを提示した．