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Studying car vibration and noise and taking effective measures to control it has also become extremely complicated. At present, effective measures have been taken to control noise in gasoline vehicles and diesel vehicles. Noise source identification and control of new energy vehicles such as hybrid vehicles, electric vehicles, and fuel cell vehicles will become a problem faced by researchers. New topics. Each test will provide effective feedback to optimize the design at the current stage. These verification tests are repeated with the design optimization to finalize the structure of the catalytic converter.
Taking a fuel cell prototype as the research object, the main frequency components of car noise, the corresponding noise source and its transmission method under stationary and different uniform speed conditions were obtained through experimental analysis of acoustic and vibration characteristics in the anechoic room. A corresponding damping and noise reduction scheme was proposed.
The noise sources in the vehicle introduce the vibration noise generated by the drive motor assembly, power steering pump, air conditioner compressor, fuel cell auxiliary system moving parts (such as hydrogen pump, fan) and cooling water pump of the fuel cell vehicle studied. The main source of noise. Among them, the drive motor assembly, the power steering pump, the air-conditioning compressor, and the fuel cell cooling water pump are arranged in the front compartment, and the hydrogen pump and the fan are arranged in the luggage compartment. Due to the sample car borrowing the traditional engine front passenger car body, the back of the car body did not use sound insulation measures. When the fuel cell power system works, the occupants in the rear seats obviously feel a low “rumble†roar, and the rear seats The noise is significantly higher than in the front seats.
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