Abstract:

For the operational noise problem in fuel cell systems of hydrogen-powered commercial vehicles， in this study radiator aerodynamic noise and exhaust pneumatic noise are identified as primary sources through vehicle-level NVH testing. By implementing a multidimensional integrated noise reduction solution of exhaust silencer structural optimization， centrifugal fan aerodynamic modification， and intelligent control strategies （including hydrogen valve parameter adjustment and purging strategy enhancement）， effective suppression of key noise sources is achieved. The experimental results show a 5 dB（A） reduction in driver's ear-level noise under FCV steady-state conditions and a 4.7 dB（A） decrease during shutdown purging. Subjective-objective evaluation confirms the optimized acoustic performance meets engineering requirements. The research establishes a systematic noise control framework encompassing "source identification， multi-physics optimization， and system control，" providing a replicable technical paradigm for NVH improvement in commercial fuel cell vehicles.

Key words: hydrogen-fueled commercial vehicles, NVH, radiators, tail-exhaust silencer, noise propagation