Case 2-difficult to fix Occurrence of failure mode FM FM C Don Clausing 1998 16881 Fig 6
Case 2 – difficult to fix Occurrence of failure mode FM1 FM2 © Don Clausing 1998 16.881 Fig. 6
Case 1 and Case 2 Both cases have same failure rate But situations are very different Counting failure rate is very weak approach to the reduction of failure rate Concentrate on ideal function What is the system supposed to do? Then make system do it all of the time C Don Clausing 1998 16881 Fig. 7
Case 1 and Case 2 • Both cases have same failure rate • But situations are very different • Counting failure rate is very weak approach to the reduction of failure rate • Concentrate on ideal function – What is the system supposed to do? • Then make system do it all of the time © Don Clausing 1998 16.881 Fig. 7
The engineered system N olse Signal System Response Control factors C Don Clausing 1998 16881 Fig 8
The engineered system Noise Signal System Response Control factors © Don Clausing 1998 16.881 Fig. 8
Ideal function Ideal function 00.0u2 (response) SIGNAL, M C Don Clausing 1998 16881 FI
Ideal function Ideal function (response) RESPONSE SIGNAL, M © Don Clausing 1998 16.881 Fig. 9