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- W2310910227 abstract "One of major failure causes of rotary compressor is lubrication-related. Under the premise that bearings involve no major faults either in the design and material selection, their reliability is sensitive to the amount of system refrigerant charge and the amount of oil. These two factors, oil and refrigerant in the oil sump of rotary compressor are of great interest for lubrication failure modes and their causes. This paper introduces a two-parameter step stress life testing methodology for evaluation of lubrication-related reliability. The methodology uses the amount of oil in the compressor oil sump and refrigerant in the refrigeration system as the two control parameters. Refrigeration oil, as one parameter, is reduced in increment, while refrigerant charge is increased in step-by-step increment In such a step-wise increase in stress, lubrication failure is bound to occur. Resultant failure modes and the stree level, that is determined by the combination of the two control parameters provide design, reliability and application engineers with valuable information. Applications of the step stress methodology include evaluation of bearing design, material selection, and system design, for examples. TEST STRESS and ACCELERATED LIFE TESTING It is a common practice in the field of compressor reliability engineering to use some forms of accelerated life testingY 1 One common way of accelerated life testing is testing compressor at a fixed stress level during the entire testing period. The definition of reliability relates to the operating condition that, in turn, determines stress level imposed on compressor. The stress used in this context is not the conventional definition of stress (force per unit area), defined in mechanics of materials, as the internal reaction of a body to the application of external loadsP 1 It rather means that the change in test condition or test variables (such as" @default.
- W2310910227 created "2016-06-24" @default.
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- W2310910227 date "2000-01-01" @default.
- W2310910227 modified "2023-09-27" @default.
- W2310910227 title "Reliability Evaluation of Rotary Compressor By Two-Parameter Step Stress Life Testing" @default.
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