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)

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.

Electromagnetic and NVH Analysis of PMSM with Eccentricity and Rotor Magnetization Variations

Sumeet Singh (EMWorks)･Rabah Hadjit (ESI)･Mario Felice (virsolTech)･Taiki Tsukada (ESI)

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．