Comparittve study of noise and vibration measurements of computer cooling fans
Keywords:Accelerometers, Acoustic emissions, Data reduction, Fans, Heat sinks, Vibrations (mechanical), Acoustic dipoles, Computer cooling fans, Sound radiation
AbstractThe relationship between measured vibration levels of several cooling fan heat sink designs to experimentally determine acoustic emission levels, are presented. The structure of a computer heat sink shroud, which is refereed to as an acoustic dipole, can be modeled to represent a pulsating structure. The sound radiation is representative of the force, which is required to accelerate the added mass of the air. Vibration measurements of four fan sink designs are taken using a very small accelerometer placed at five locations on the heat-sink shroud at various operating speed. All the acoustic measurements are performed in a semi-anechoic room and in accordance to the standards of ECMA-74, ISO 7779 and ISO 3744. The noise measurement data showed that the resulting noise comes from the vibrating source and an aeroacostic generated noise. The aluminum shrouds produce the greatest overall vibration levels compared to the plastic directional shrouds.
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