Abstract: To enhance the lifetime of a newly designed reciprocating compressor in a refrigerator, parametric accelerated life testing (ALT) were developed using new definitions of the sample size equation and the B1 life index. In 1st ALT, compressor was locked due to the fracture of the suction reed valve. The failure modes and mechanisms of the suction reed valve in the accelerated tests were found to be similar to that of the failed product in the field. The root cause of the failure was the overlap between the suction reed valve and the valve plate in the suction port. The design faults in the design phase were modified by the trespan size, tumbling process, the material and thickness for the valve, a ball peening and brushing process for the valve plate. In 2nd ALT, compressor was locked due to the interference between the crank shaft and thrust washer. The corrective plan was to give heat treat the surface of crank shaft. During the third ALT, there were no problems. The B1 life of the com

• Publication Date: 31-May-2020
• DOI: 10.15224/978-1-63248-188-7-13
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Abstract: The novel coronavirus caused pandemic COVID 19 which affected the whole world since December 2019. As social distancing was to be observed in absence of any vaccine for COVID 19 to arrest its fast spread, lockdown was imposed in several parts of the world. Lockdown affected education system as schools, colleges and universities were closed to reduce contacts and save lives. Thus on line education became necessary to engage students to complete their curriculum or extra curricular activities. Present paper discusses factors arising out of uncertainty related to on-line education of school, college and research students with respect to learning, psychological impact and evaluation.

• Publication Date: 31-May-2020
• DOI: 10.15224/978-1-63248-188-7-14
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