Speaker
Description
This study examines the influence of seat‑position changes on the transfer functions between the target point, representing the occupant’s ear location, and the error microphones installed at each seat to optimize Active Road Noise Control (ARNC) performance. In ARNC systems, error microphones remain fixed at predefined locations, while the target position varies with seat adjustment. This positional variation may affect the intended control performance, making it necessary to quantitatively evaluate its impact during the early system design phase. This study aims to evaluate the Virtual Transfer Path (VTP) by measuring and comparing the transfer functions between the occupant ear location and the error microphones for various driver and co‑driver seat positions within their allowable adjustment ranges. The comparison of the VTPs obtained from in‑vehicle measurements indicates that the transfer functions remain largely unchanged in the booming band (20-150Hz), whereas statistically meaningful differences emerge above 200Hz in the cavity/rumble frequency range. These observations indicate that the influence of seat-position variations on ARNC performance becomes more pronounced at frequencies above 200Hz, reflecting increased sensitivity of the VTP at higher frequencies.These findings further imply that, in the control of higher‑frequency in‑cabin noise sources beyond Road Noise (e.g., Wind and HVAC noise), a seat‑position grouping strategy with representative transfer functions can be an effective approach to ensuring robust ANC performance.