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PROJECT PRESENTATION Battery Swapping Reliability Wesley Lavender EMIS 7305
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Presentation Outline Overview Scope Problem Analysis Overview Industrial Robots Performing Swap Charging Stations Results Conclusions Questions
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Overview Battery swapping stations have been proposed by Better Place as a solution to the problem of electric vehicle batteries’ limited range. The Better Place switch stations are currently in the demonstration phase and use a mix of mature and immature technology. Better Place Switch Station
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Scope Original Scope: Reliability, Maintainability, Supportability Analyzing the battery identification process, battery swapping process, and the charging of depleted batteries Refined Scope: Reliability only Analyze battery swapping process (including the clamping mechanism, the retrieving mechanism, and the moving tray) and charging stations
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Problem Battery swapping is new and immature Little testing completed on reliability of battery swapping systems Complex system with a lot of moving parts
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ANALYSIS Overview, Industrial Robots Performing Swap, and Charging Stations
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Overview Selected Model: Exponential commonly used for electronic equipment constant failure rate model used in analyzing the ‘useful life’ period of an item’s life Failure rates and MTBFs used were measured during testing
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Industrial Robots Performing Swap 3 Primary Components: Clamping mechanism: holds vehicle in place while swapping battery Retrieval mechanism: retrieves/inserts batteries Moving tray: contains clamping and retrieval mechanisms and moves batteries to and from vehicle Failure Rate (λ)MTBF (in hours) Clamping mechanism0.0000520,000 Retrieving mechanism0.000110,000 Moving Tray0.000062516,000 FIGURE 1: Industrial Robots failure rates and MTBFs
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Industrial Robots Performing Swap Reliability Function: R(t) Clamping mechanism0.966 Retrieving mechanism0.905 Moving Tray0.911
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Industrial Robots Performing Swap Components in a series configuration: Product Rule of System Reliability: R S (t) = (0.966)*(0.905)*(0.911) = 0.796 Failure rate: = 0.000213 MTBF S = 4,706 Clamping Mechanism Retrieval Mechanism Moving Tray
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Charging Stations 5 identical, independent charging stations Need at least 3 in operation at all times R-out-of-N configuration (n=5, r=3) S1 3 out of 5
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Charging Stations
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Results R(t)Failure Rate (λ)MTBF (in hours) Industrial Robots 0.7960.0002134,706 Clamping mechanism0.9660.0000520,000 Retrieving mechanism0.9050.000110,000 Moving tray0.9110.000062516,000 Charging Stations 0.7960.000491,958 FIGURE 4: Summary of reliabilities, failure rates, and MTBFs
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Conclusions Technology too immature for widespread commercial implementation Industrial robot system should use redundancy to improve reliability Charging stations should improve reliability of individual stations to improve overall reliability
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Questions? References: "Better Place." Wikipedia. Wikipedia Foundation, Inc., 07APR2012. Better Place official website. www.betterplace.com. EMIS 7305 class notes.
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