Appliance and Compressor Manufacturer’s Joint Effort to Reduce Noise
نویسندگان
چکیده
Appliance manufacturers establish standards to meet customer's requirements. Whirlpool of India (WOIL) surveyed its market and converted the customer's need for a quiet appliance into an acceptable sound level when tested in their reverberation room. Tecumseh Products India Limited (TPIL), a major compressor supplier to WOIL, was made a partner in meeting this standard. The standard specifies a maximum overall sound power level of 46 dBA for the refrigerator when tested in the WOIL reverberation room. The compressor manufacturer reviewed their compressors for sound, vibrations and pressure pulsations. It was found that near 400 Hz, which is the ath harmonic of the running frequency of 50 Hz, both sound and discharge pulsations were high. This resulted in a overall sound power level of 50.6 dBA. The sound reduction was made at Tecumseh Research facilities in India and also at Tecumseh Research Labs in the USA. Joint work at these three places resulted in better time management for designing, verifying and validating the changes required to reduce the sound power levels to 45.0 dBA on the appliance. The final customers of this new model refrigerator, with reduced sound, will reap the benefits ofWOIL-TPIL team work.
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