Reliability
219
4.17.
4.18.
4.19.
4.20.
4.21.
4.22.
4.23.
4.24.
4.25.
4.26.
4.27.
4.28.
4.29.
4.30.
RADC Non-Electronic Reliability Note Book RADC-TR-85-194 DTIC
Alexandria, VA.
Non-Electronic Parts reliability Data, NPRD 95, Reliability Analysis Center,
Rome NY, 1995.
RAC Journal, Reliability Analysis Center, Rome NY.
Reliability Handbook, Navy Ships 94501, August 1968.
Rothbart HA. Mechanical Design and Systems Handbook, New York:
McGraw-Hill Book Co, 1964.
Smith DJ. Reliability Engineering, Barnes and Noble, 1972.
Shooman M. Probabilistic Reliability an Engineering Approach, New York:
McGraw-Hill Inc, 1968.
Vidosic JP. Elements of Design Engineering, New York: The Ronald Press
Co, 1969.
Von Aluen WH. (ed) Reliability Engineering, Englewood Cliffs, N J: Prentice-Hall, 1964.
Wiesenberg RJ. Reliability and Life Testing of Automotive Radiators, General Motors Engineering Journal, 3rd Quarter 1962.
Woods BM, Degarmo ED. Introduction
to Engineering Economics
MacMillan Co, 1942.
Woodward III JB. Reliability Theory in Marine Engineering, Society of
Naval Architects and Marine Engineers, Cleveland, 1 February 1963.
What is Reliability Engineering? Product Engineering, 16 May, 1960.
Riddick Jr RP. Application of Reliability Engineering to the Integrated
Steam Power Plant, Proceedings on Advance Marine Engineering Concepts
for Increase Reliability, University of Michigan, February 1963.
PROBLEMS
PROBLEM 4.1
A manufacturer sells a motor with major components having the following
reliability characteristics:
(I) Electrical failure (insulation, windings, etc.) MTTF = 20,000 hr
(II) Mechanical failure (impeller, casing, etc.) MTTF = 10,000 hr
(III) Bearing wearout (2 bearings)/~ -- 1800
~ = 600 hr, each
(IV) Brush wearout (2 brushes) # = 1000
a = 200 hr, each
(a) Calculate the reliability at 500 hr
(b) If the manufacturer has a 500 hr guarantee, how many motors
will he have to replace or repair per 1000 sold?