Jeroen Steenbakkers - Academia.edu (original) (raw)
Uploads
Papers by Jeroen Steenbakkers
Proceedings Title: Proceedings of the 2012 Winter Simulation Conference (WSC), 2012
Simulation has proven to be a successful method for analyzing and improving value chains and cost... more Simulation has proven to be a successful method for analyzing and improving value chains and cost price analysis in complex environments, such as aircraft production. This case-study concerns the value chain simulator (VCS), developed by INCONTROL for Fokker Aerostructures. This VCS enables the users to deal with all relevant parameters for manufacturing, logistics and financing in early project phases. The Fokker VCS is integrated in the current ERP system, so all relevant design parameters including Bill of Material, Bill of Processes and Bill of Resources are imported in the VCS and the simulation model is built up automatically. Since all financial parameters are included in the model, eventually the cost-price development of the manufactured parts over the full delivery period is calculated using simulation. The simulation application has already achieved benefits, but the final goal of this ongoing development is to accomplish an application which supports aircraft manufacturers in determining the Total Cost of Ownership for their products.
The Macroscopic Fundamental diagram (MFD) has proven to be a powerful concept in understanding an... more The Macroscopic Fundamental diagram (MFD) has proven to be a powerful concept in understanding and managing vehicular network dynamics, both from a theoretical angle and from a more application-oriented perspective. In this contribution, we explore the existence and the characteristics of the pedestrian Macroscopic Fundamental Diagram (p-MFD). From a theoretical perspective, the main contribution of this research shows how we can derive the p-MFD from assumed local fundamental diagrams (FDs). We show that we can relate the average (out-) flow from a pedestrian network as a function of the average spatial density and the density spatial variation. We show that the latter is essential to provide a reasonable description of the overall network conditions. For simple linear relations between density and speed, we derive analytical results; for more commonly used FDs in pedestrian flow theory we show the resulting relation using a straightforward simulation approach. As a secondary contribution of the paper, we show how the p-MFD can be constructed from pedestrian trajectory data stemming from either microsimulation or from experimental studies. The results found are in line with the theoretical result, providing further evidence for the validity of the p-MFD concept. We furthermore discuss concepts of hysteresis, due to the differences in the queue build up and recuperation phases. We end with applications of the presented concepts, e.g. in crowd management.
Proceedings Title: Proceedings of the 2012 Winter Simulation Conference (WSC), 2012
Simulation has proven to be a successful method for analyzing and improving value chains and cost... more Simulation has proven to be a successful method for analyzing and improving value chains and cost price analysis in complex environments, such as aircraft production. This case-study concerns the value chain simulator (VCS), developed by INCONTROL for Fokker Aerostructures. This VCS enables the users to deal with all relevant parameters for manufacturing, logistics and financing in early project phases. The Fokker VCS is integrated in the current ERP system, so all relevant design parameters including Bill of Material, Bill of Processes and Bill of Resources are imported in the VCS and the simulation model is built up automatically. Since all financial parameters are included in the model, eventually the cost-price development of the manufactured parts over the full delivery period is calculated using simulation. The simulation application has already achieved benefits, but the final goal of this ongoing development is to accomplish an application which supports aircraft manufacturers in determining the Total Cost of Ownership for their products.
The Macroscopic Fundamental diagram (MFD) has proven to be a powerful concept in understanding an... more The Macroscopic Fundamental diagram (MFD) has proven to be a powerful concept in understanding and managing vehicular network dynamics, both from a theoretical angle and from a more application-oriented perspective. In this contribution, we explore the existence and the characteristics of the pedestrian Macroscopic Fundamental Diagram (p-MFD). From a theoretical perspective, the main contribution of this research shows how we can derive the p-MFD from assumed local fundamental diagrams (FDs). We show that we can relate the average (out-) flow from a pedestrian network as a function of the average spatial density and the density spatial variation. We show that the latter is essential to provide a reasonable description of the overall network conditions. For simple linear relations between density and speed, we derive analytical results; for more commonly used FDs in pedestrian flow theory we show the resulting relation using a straightforward simulation approach. As a secondary contribution of the paper, we show how the p-MFD can be constructed from pedestrian trajectory data stemming from either microsimulation or from experimental studies. The results found are in line with the theoretical result, providing further evidence for the validity of the p-MFD concept. We furthermore discuss concepts of hysteresis, due to the differences in the queue build up and recuperation phases. We end with applications of the presented concepts, e.g. in crowd management.