Reliability Flashcards
1
Q
MTBF
A
mean time between failures
2
Q
Define reliability:
A
The probability that the system will operate as expected for an expected period of time
3
Q
Define maintainability:
A
The probability of performing a successful repair within a given time.
4
Q
Formulae: Lambda
A
Failure Rate = 1/MTBF
5
Q
For a constant failure rate, the probability distribution of reliability is _____.
A
Exponentially decay
6
Q
Describe bathtub phases:
A
- High risk of failure early on
- Moderate failure during operations expected duration
- high failure as wear out occurs
7
Q
We can increase fault tolerance by creating _______./
A
Redundancy
8
Q
Formulae: Reliability
A
R = e^(-Lt)
or
R = e^(-t/MTBF)
9
Q
Formulae: Series Reliability
A
R = R1R2….*Rn
10
Q
Formulae: Parallel Reliability
A
R = 1 - (1 - R1)(1 - R2)…*(1 - Rn)
11
Q
Designing redundancy in ______ increases ________.
A
parallel, reliability
12
Q
Name some ways to increase reliability:
A
- Decrease time between failures
- Provide ample design margins & contingencies
- Add redundancy
- Reallocate system performance & resources to adjust
- Decrease Complexity
