Failure Modes
DESIGN PHASE:       measurement
SUB ELEMENT NAME:   failure modes
VARIABLE NAME:      [HEMFAIL]
DATE:               REVISION LETTER:    REVISION DATE:
APPLICABILITY:      all circuits

ACTIVITY:  Verify circuit does not fail under abnormal operating
conditions or that a single failure does not cause secondary
failures.

OUTPUT:  Measurements and discussion in laboratory notebook for
later comparison to specifications and analysis.

ALGORITHM:

[HEMFAIL] =    number of engineer hours for fail mode (and
               effects) measurements
[HTMFAIL] =    number of technician hours for same
0.0+           set up time
0.0*           time per measurement
[NFAIL]        number of failure mode measurements

output.short  [OUTPUT COUNT]
input.short   [INPUT COUNT]
bias.sequencing FACTORIAL[INPUT COUNT] (use [INPUT COUNT])
missing.off.module.signal (clock.failure, etc) and other
failures.  use  0.0*[PARTS COUNT]

[NFAIL] = 1.0*[OUTPUT COUNT]+2*[INPUT COUNT]+0.2*[PARTS COUNT]

DISCUSSION:


Author: Jerrold Foutz, foutz@smpstech.com

Original: Foutz, J., Power Supply Circuit Development Estimating Aid - An Expert System Application, IEEE Applied Power Electronics Conference Record, New Orleans, February 1-5, 1988. Revised 21 February 2001

Copyright © 2001 Jerrold Foutz


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