Reliability
The reliability of a product is the
probability of performing its intended function over its specified life.
R = N-n/N
Where
N= Number of article
n=no. of failed articles
Factor Affecting Reliability
1.
Complexity of product
2.
Manufacturing process
3.
Operations and management
4.
Component reliability
5.
Environment condition
6.
Reliability and failure of
product
Rate of failure = No. of items which
failed/ Total test hours of all items
Explanation
Reliability is a characteristic
which refers to the ability of product to perform its intended function when
required to do so.
It is the integral of the distribution
of probabilities failure free operation from the instant of switch on to the
first failure.
It is a mean operating time for
a given specimen between two failures.
Components or system
reliability is the probability that the component or system will not fail for a
time t.
It is the system capacity for a
failure free operation for a definite period of time under given conditions and
minimum time lost for repair and preventive maintenance.
It is a probability that a
device will operate without failure for a given period of time under given
operating conditions. The reliability definition given by the Electronic
Industries Association [EIA] USA states that ‘Reliability is the probability of
a device performing its purpose adequately for the period of time intended
under the operating conditions encountered.’
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