Studying the vibration and noise of automobiles and taking effective measures to control them has also become extremely complicated. At present, effective control measures have been taken to control the internal noise of gasoline and diesel vehicles, while the problem of identifying and controlling noise sources of new energy vehicles such as hybrid vehicles, electric vehicles, and fuel cell vehicles will become a problem for researchers. New subject. Each test will provide effective feedback to optimize the design at this stage. These verification tests and design optimization are repeated to determine the structure of the catalytic converter.
Taking a fuel cell prototype vehicle as the research object, through the experimental analysis of its acoustic and vibration characteristics in the anechoic chamber, the main frequency components of the noise in the vehicle under static and different uniform speed conditions and the corresponding noise sources and their transmission methods are obtained. The corresponding vibration and noise reduction schemes are proposed.
Introducing the noise sources in the car The vibration and noise generated by the driving motor assembly, power steering pump, air-conditioning compressor, fuel cell auxiliary system moving parts (such as hydrogen pump, fan) and cooling water pump of the fuel cell prototype vehicle studied are inside the car The main source of noise. Among them, the drive motor assembly, power steering pump, air-conditioning compressor, and fuel cell cooling water pump are arranged in the front compartment, and the hydrogen pump and fan are arranged in the luggage compartment. Because the prototype car borrows the traditional engine front car body, the rear part of the body does not adopt sound insulation measures, when the fuel cell power system is working, the occupants in the rear seats obviously feel a low “buzzing” roar, and the rear seats The noise is significantly higher than the front seats.
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