Reliable Equation Pdf For Free

The basic reliability characteristics are explained: time to failure, probability of failure and of failure-free operation, repairable and unrepairable objects. Mean time to repair and between repairs, coefficient of availability and unavailability, failure rate. Examples for better understanding are included.

Reliability is complementary to probability of failure, i.e. R(t) = 1 ?F(t) , orR(t) = 1 ??[1 ?Rj(t)] . For example, if two components are arranged in parallel, each with reliability R 1 = R 2 = 0.9, that is, F 1 = F 2 = 0.1, the resultant probability of failure is F = 0.1 × 0.1 = 0.01.

... which is related to the degree to which measures are free from random errors (Martin and Bateson, 1993), is another important requirement of scientific measurement, and will be mentioned only briefly here. Reliability is determined by precision, sensitivity, resolution and consistency (see Table 1).

Curve; reliability calculations use ? = 2r + 2 where r = number of failures or rejects. FIT (Failures in Time) is a standard industry value defined as the Failure Rate (?) per billion hours.

Reliability is the probability of a product successfully functioning as expected for a specific duration within a specified environment. Figure 1 shows the four key elements to reliability: function, probability of success, duration and environment.

MTBF is a basic measure of a system's reliability; the higher the MTBF, the higher the reliability of a product. This relationship is illustrated in the equation: Reliability = e-(time/MTBF). There are a few variations of MTBF you may encounter.

The reliability definition stresses four elements namely - probability, intended function, time and operating conditions. Thus, reliability is always a function of time. It also depends on environmental conditions which may or may not vary with time.

Reliability = continuity of correct service (i.e. without failures), safety = absence of catastrophic consequences for the users and the environment, maintainability = ability of the object to be maintained (and repaired), and. maintenance support = technical and organizational means enabling maintenance and repairs.