Robust design of hydrodynamic bearings: adopting Taguchi methods towards zero defects of a hermetic compressor
by Suresh Akella; Leela Prasad; N. Venkateswarlu
International Journal of Precision Technology (IJPTECH), Vol. 2, No. 4, 2011

Abstract: Indian manufacturing companies have passed through the conventional manufacturing with quality control systems, 100% inspection, to a quality assuring TQM companies with robust designs to obtain PPM levels of customer returns. This study is about the hydrodynamic lubrication system in a hermetically sealed compressor to reduce the Taguchi loss function of bearing wear. Taguchi loss function is modified to include warranty. Loss/warranty period is a new parameter introduced. This parameter is lower the better, a lower value indicates less loss to society, more warranty period to customer. A product with less loss/warranty will lead to increased business to manufacturer. This parameter is used for the benefit of society, customer has more warranty period and increased business for the manufacturer. Study of warranty returned compressors was done to obtain the distribution of defects. System design, parameter design and tolerance design approach of Taguchi was adopted to obtain robustness. An improved life of product was obtained. Customers were provided with compressors so that the warranty may be increased from 18 months to five years, with no financial loss also the manufacturer had consistent reliable products.

Online publication date: Sun, 15-Jan-2012

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