Template:Tires

Tire Example

Description

A car has four regular tires and a spare tire. Each tire has two failure modes: Wear with Weibull distribution (Beta=2,Eta=40000 miles) and Puncture with Exponential distribution (Mean=1year). Assume that 2 miles=1 hour. Both Wear and Puncture failures are repaired in two days. However, Wear is repaired as good as new, Puncture is repaired as bad as old. When regular tires fail, the spare tire is activated; upon regular tire is restored, the spare tire is deactivated ans put back.

BlockSim Solution

To model this system, six diagrams are created: Car, Tire_1, Tire_2, Tire_3, Tire_4 and Spare. Car is the main diagram. In the Car diagram, five subdiagram blocks Tire_1, Tire_2, Tire_3, Tire_4 and Spare are pointed to other four diagrams with the same names.

For diagram Tire_1, there are two blocks in series. Block Wear 1 represents Wear failure mode and Puncture 1 represents Puncture mode for tire 1 respectively. Block Wear 1 belongs to maintenance group Wear_1 and Block Puncture 1 belongs to maintenance group Puncture_1. Block Wear 1 has State Change Triggers (SCT), its initial state is ON, and the state upon repair is "Always On". If any item from maintenance group Puncture_1 goes down, deactivate Block Wear 1 and if any item from maintenance group Puncture_1 is restored, activate Block Wear 1.

Other four diagrams follow the same logic.