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Reliability Design of Ice-Maker System Subjected to Repetitive Loading

Engineering（科研） 2016年第9期8卷 618-632页

作者： Seong-Woo Woo Reliability Association of Korea Seoul South Korea

parametric accelerated life testing (ALT) was used to improve the reliability of ice-maker system with a fractured helix upper dispenser in field. By using bond graphs and state equations, a variety of mechanical loads in the assembly were analyzed. The acceleration factor was derived from a generalized life-stress failure model with a new load concept. To reproduce the failure modes and mechanisms causing the fracture, new sample size equation was derived. The sample size equation with the acceleration factor also enabled the parametric accelerated life testing to quickly reproduce early failure in field. Consequently, the failure modes and mechanisms found were identical with those of the failed sample. The design of this testing should help an engineer uncover the design parameters affecting the reliability of fractured helix upper dispenser in field. By eliminating the design flaws, gaps and weldline, the B1 life of the redesign of helix upper dispenser is now guaranteed to be over 10 years with a yearly failure rate of 0.1% that is the reliability quantitative test specifications (RQ).

关键词： Reliability Design Sample Size Equation Acceleration Factor parametric accelerated life testing Helix Upper Dispenser Reliability Quantitative Test Specifications (RQ)

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Improving the Reliability of a Domestic Refrigerator Compressor Subjected to Repetitive Loading

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Engineering（科研） 2016年第3期8卷 99-115页

作者： Seong-Woo Woo Dennis L. O’Neal Korea testing Co. Ltd. Daejeon City South Korea Engineering and Computer Science Baylor University Waco USA

As a reliability quantitative specification, parametric accelerated life testing was used to assess the reliability of a newly designed compressor of a commercial refrigerator subjected to repetitive stresses. A generalized life-stress failure model and new sample size equation with a new load concept were derived starting with the basic refrigeration cycle. The sample size equation with the acceleration factor also enabled the parametric accelerated life testing to quickly evaluate the expected lifetime. The design of this testing should help an engineer uncover the design parameters affecting reliability during the design process of the compressor system. Consequently, it should help companies improve product reliability and avoid recalls due to the product failures in the field. A newly designed compressor in a commercial refrigerator was used as a test case.

关键词： Refrigeration System Generalized life-Stress Failure Model Load Analysis Sample Size Equation Acceleration Factor parametric accelerated life testing Compressor Suction Reed Valve

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