Seong-Woo Wooa and Michael Pechtb
aDirector and Chief Researcher, Reliability Association of Korea, South Korea
bUniversity of Maryland, USA
New designed residential-sized refrigerators subjected to repetitive random
vibrations can be damaged during transportation. The damage consists of
the fracturing of the tubes between the compressor and condenser and the
tearing of the compressor rubber mounts. As the reliability quantitative
(RQ) test specifications, parametric accelerated life testing (ALT) through
sample inspections and corrective action plans was used to identify the key
control parameters for the connecting tubes and compressor rubber mounts.
The shape of failures in refrigerators found experimentally was identical to
those of the failed samples in the field. The connecting tube fractures
resulted from the problematic shape of the compressor rubber mount. To
correct these problems, the mounts and connecting tubes were redesigned.
The refrigerators with targeted B1 life were expected to survive without
failure during rail transport. Parametric ALTs were effective in identifying
the missing design parameters of mechanical systems such as refrigerators
during the design phase. The reliability design method presented in this
paper should be applicable to other mechanical systems during
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