University of Twente Student Theses


Towards a standardized availability model for material handling systems

Gietema, Nienke (2016) Towards a standardized availability model for material handling systems.

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Abstract:Downtime of a system is expensive for the customers of Vanderlande. Therefore, availability of a system is an important key performance indicator during the design phase of a material handling system. Currently, each market segment within Vanderlande uses its own methods to calculate the availability of a system in the design phase. We design a simple time simulation model to estimate the system availability. We found that our model is accurate for parallel and k-out-of-n structures. For serial structures our model underestimates system availability compared to the exact serial system availability. A combination of different structures gives accurate results. The running time exponentially increases with the number of components. This increase is even larger for simulation of parallel and k-out-of-n structures. Our study is a first research towards standardized, fast and accurate availability calculation. This results in a prototype tool that can handle small material handling systems and estimate its system availability. We recommend to further develop our tool to make it suitable for the large and complex systems Vanderlande designs by making the software more efficient, designing a user friendly layout and by adding relevant features such as subsystem availability calculation and a list of critical components.
Item Type:Essay (Master)
Faculty:BMS: Behavioural, Management and Social Sciences
Subject:50 technical science in general
Programme:Industrial Engineering and Management MSc (60029)
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