Teste Tri Man 14 11 2016 PDF

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TRIBOLOGY & MAINTENANCETEST DURATION: 2:30 14/11/___IThe system of the figure below represents a sub-system of an aeroplane where thelife curves of the components A, B and C are defined by the following probabilitydensity functions:TmA = 2100 HV and A = 500 HVB = 7000 HV and B = 0.C = 2...

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TRIBOLOGY & MAINTENANCE TEST

DURATION: 2:30

14/11/2016

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I The system of the figure below represents a sub-system of an aeroplane where the life curves of the components A, B and C are defined by the following probability density functions: TmA = 2100 HV and A = 500 HV B = 7000 HV and B = 0.5 C = 2x10-4 HV-1 HV – flight hours 1. Detail the zones of the bathtub curve that correspond the probability density function of each component. 2. Determine the reliability of each component for a mission of 1000 HV. 3. Determine the system reliability for a mission of 1000 HV 4. Define  and  and explain the relation with the MTBF and MTTR parameters. 5. Obtain the availability expression knowing:

II Consider a parallel system composed by 4 equals components with  = 10-4 h-1. 1. Write the possible condition states of the system and their reliability equations. 2. Determine the probability that no component fails during 1000 h considering a scenario with replacement. 3. Determine the probability that no component fails during 1000 h considering a scenario without replacement. 4. Determine the system reliability for t= 1000 h considering a requirement of "1 in 4" and a scenario without replacement. Consider a standby system with 2 different components (1 and 2). 5. Define the following parameters: 1 , SCa , SCs , 2c , 2v . 6. Knowing that the mission has a duration of t=t2, describe in detail how the standby system works in the following situations: a) The main unit 1 works until t=t2; b) The main unit 1 fails at t1 (0...