Modeling Present Worth of Product Quality Loss of STB Characteristic Based on Service Life Distribution
Modeling Present Worth of Product Quality Loss of STB Characteristic Based on Service Life Distribution
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DOI：
10.4028/www.scientific.net/amm.397-400.846
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发表时间：
2013-09
期刊：
影响因子：
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通讯作者：
Y. Zhao;D. Liu;Z. Wen;Tingting Liu
中科院分区：
文献类型：
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作者：
Y. Zhao;D. Liu;Z. Wen;Tingting Liu
产品投入使用后，由于持续的应力、磨损等原因，产品的越小越好（STB）质量特性不断变化并超出规格限度，从而导致产品不合格、报废而造成损失。基于产品质量损失是由于产品质量特性不合格而导致产品投入使用后报废而导致其质量特性造成的损失现值的质量观点，建立了基于使用寿命分布的机顶盒特性质量损失现值模型，提出了基于机顶盒质量特性技术规范的产品使用寿命概率密度函数（PDF）的计算方法。以连杆衬套内外圆柱面同心度为例，分析了新模型中影响同心度质量损失现值的各种因素，并与田口质量损失模型进行对比。结果表明，新模型描述了产品投入使用后给社会带来的实际损失，能够反映机顶盒特性在产品使用过程中的质量损失，比田口机顶盒质量损失模型更加真实。新模型将机顶盒特性的公差设计从制造阶段延伸到服务阶段。
The product smaller-the-better (STB) quality characteristics are continually changing and out of specification limits because of the constant stress, wear and others after the product is put into use, which will cause loss because of the product rejected and scrapped. On the basis of the quality viewpoint that product quality loss is present worth of a loss caused as a result of its quality characteristics because its quality characteristic is out of specification and lead to product scrap after the product is put into service, the paper establishes the present worth model of quality loss of STB characteristic based on service life distribution, and proposes the calculation method on the probability density function (PDF) of the product service life based on the technical specifications of STB quality characteristic. It takes the concentricity between the inner cylindrical surface and the outer cylindrical surface of the link bushing as an example to analysis the various factors that impact on the present worth of concentricity quality loss in the new model, and contrast with Taguchi quality loss model. The results show that the new model describes an actual loss that a product imparts to society after the product is put into service, and can reflect the quality loss of STB characteristic in the product service process, and is more realistic than Taguchi quality loss model of STB. The new model extends tolerance design of STB characteristic from the manufacturing stage to the service stage.