Reliablity 3.pdf

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Basic Concept of Reliability Background Automation in Industry Process Complexity of industry System as well as their product day by day Effectiveness – Is ability of the system for fulfillment of the intended tasks and efficiency of utilizing the means put into it The ability / Suitability of the system is primarily determined by the reliability and quality of the system. Reliability haunts every one – 1. System used in space
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  3/26/2018 ISD 1 Basic Concept of Reliability Background  Automation in Industry Process  Complexity of industry System as well as their product day by day  Effectiveness  –   Is ability of the system for fulfillment of the intended tasks and efficiency of utilizing the means put into it  The ability / Suitability of the system is primarily determined by the reliability and quality of the system. Reliability haunts every one  –   1. System used in space 2. Low cost common consumer  Reliability of components used in TV sets can’t be expected to be high as the reliability of components used in missile or space  3/26/2018 ISD 2 Contd….   Reliability  The probability that a failure may not occur in the given time interval  Reliability of a unit / product / components is the probability that the unit  perform its intended function adequately for a given period of time under the stated operating condition or environment  If the T is the time till failure of the unit ( a random variable ) occurs , then the probability that it will not fail in a given time t is R  (t) = P(T > t)  Thus reliability always function of time  It also depends on environmental conditions which may or may not very with time.  Its numerical values always lies between 0 and 1  3/26/2018 ISD 3 Quality and Reliability  Quality of a device is the degree of conformance to applicable specification and workmanship standards  Quality is associated with manufacturing where as reliability is primarily associated with design  Reliability is the ability of unit to maintain its quality under specific condition  3/26/2018 ISD 4 Failure and Failure Modes Failure  Failure is the partial or total loss or change in those properties of a device ( or a system ) in such a way that its functioning is seriously or completely stopped  Some components are well define failure - other do not eg bulbs  Initial failure  –   Due to manufacturing defects such as poor insulation , bad assembly  Random failure -Failure after initial failure generally occurs after long period of time  –   Difficult to determine their causes  –   they may occur due to changes in working condition / stress  Over long period the system / unit begin to deteriorate and this region is called wear out region
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