Мехатроника 1 Бөлім mechatronics
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Мехатроника 1 том Баймухамедов М.Ф., Джаманбалин Қ.Қ.,Ақгул м.К.
| 5.3 Reliability
The main indicator of failure-free operation is the probability of failure-free operation – the probability that failure will not occur within a given time or specified operating time. The probability of failure-free operation is estimated by the relative number of workable elements: where N is the total number of tested (operated) samples; N p – number of operable samples after testing (operation); n is the number of failed samples after the tests; Q (t) is the failure probability, estimated by the relative number of failures: 243 Since failure-free work and failure are mutually opposite events, then: P(t) + Q(t) = 1 at t = 0 and n = 0 we obtain Q(t) = 0 и P(t) = 1. at t = 0 and n = N , Q(t) = 1 and P(t) = 0. The distribution of failures in time is characterized by the function of the distribution density f (t) of the operating time to failure. In the statistical interpretation: in a probabilistic treatment: where Δ n is the increment in the number of failed objects and, accordingly, the probability of failures in time Δt . The probability of failures and failure-free operation in the distributional density function is expressed by the dependences : at The failure rate λ(t) refers to the number of workable objects N(p) . In the statistical interpretation: in a probabilistic treatment: The probability of failure-free operation, depending on the failure rate, can be written as: 244 This is one of the basic relationships of reliability theory. жүктеу/скачать 11,25 Mb. Достарыңызбен бөлісу:
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