Reducing noise in car air conditioners


Perceived quality improvement


Smart life on board

Customer needs

Sanden looked for reducing noise inside cars. Its goal was to predict the noise of its equipment in order to assist its customers in redefining specifications for a better integration on their vehicles.

Customer benefits

  • A tailor-made support leveraging on its involvement in standardisation work and its vibration and acoustic expertise
  • A specifications redefinition which rely on the blocked forces in order to guarantee better integration of the compressor onto the vehicle

Cetim answer

Cetim carried out study to determine the forces “blocked” in the compressor at each attachment point with a view to more fully characterise the vibratory source of the compressor and its integration on the car.
The methodology used by Cetim was taken from the ISO 21955 standard which is currently being prepared: “Vehicles – experimental method for transposition of dynamic forces generated by an active component from a test bench to a vehicle”

Delivered results

Cetim adapted the protocol proposed in the standard to company’s products, applied it by outlining the whole of the required experimental system (number and location of the accelerometers) for the measurements on their bench.

A methodology implanted in the form of automated routines in the Sanden measurement acquisition programme


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