Compressor is one of the main parts in the
refrigerator having a critical role in the proper circulation of the
refrigerant in the vapour compression cycle. Quality inspection
techniques are regulated and carried out in the manufacturing
stage to check the quality of the compressors. A considerable
quantity of defective compressors results in economical loss and
therefore, there is a need for an advanced technique for the early
identification of defective compressors. It is noted that the sound
appears to have fluctuations when the compressors are
malfunctioning during the service period or early stage. This
motivated to further perform research using control charts in
the early manufacturing stage and to come up with a novel
statistical-based technique for assessing the quality of
refrigerator compressors based on acoustic data. The study
revealed that the sample points in the control chart exceeded the
upper control limits in I chart and MR chart when the noise is
produced. The process capability indices are less than one
indicating the defected compressors. The research is promising
as an alternative method for assessing the quality inspection
techniques. |
