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Alkass S, El-Moslmani K, AlHussein M

A computer model for selecting equipment for earthmoving operations using queuing theory

Abstract: This paper presents a computer model “FLSELECTOR” for equipment fleet selection for earthmoving operations. The methodology based on the queuing theory is incorporated in a computer module to account for the uncertainties in that are normally associated with the equipment selection process. FLSELECTOR is capable of assisting the users in making decisions required for earthmoving operations, such as determining the size and number of trucks and excavators, haul road lengths and surface conditions, etc…These decisions are based on the calculated output for all feasible fleets. An actual case study is presented in order to illustrate the effectiveness and performance of the FLSELECTOR in comparison with the simulation method

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Series: w78:2003 (browse)
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Permission to reproduce these papers has been graciously provided by the University of Auckland. The assistance of the editor who provided the full texts and the structured metadata, Dr. Robert Amor, is gratefully appreciated.


Flood I,Nowrouzian V

Construction process modelling: a constrained graphics approach versus conventional construction simulation

Abstract: Effective construction project planning and control requires the development of a model of the project’s construction processes. The Critical Path Method (CPM) is the most popular project modelling method in construction since it is relatively simple to use and reasonably versatile in terms of the range of processes it can represent. Several other modelling techniques have been developed over the years, each with their own advantages and disadvantages. Linear scheduling, for example, has been designed to provide highly insightful visual representations of a construction process, but unfortunately is largely incapable of representing non-repetitive construction work. Discrete-event simulation is generally agreed to be the most versatile of all modelling methods, but it lacks the simplicity in use of CPM and so has not been widely adopted in construction. A new graphical constraint-based method of modelling construction processes, Foresight, has been developed with the goal of offering the simplicity in use of CPM, the visual insight of linear scheduling, and the versatility of simulation. Earlier work has demonstrated the modelling versatility of Foresight. As part of a continuing study, this paper focuses on a comparison of the Foresight approach with discrete-event construction simulation methods, specifically Stroboscope (a derivative of CYCLONE). Foresight is shown to outperform Stroboscope in terms of the simplicity of the resultant models for a series of case studies involving a number of variants of an earthmoving operation and of a sewer tunnelling operation. A qualitative comparison of the two approaches also highlights the superior visual insight provided by Foresight over conventional simulation, an attribute essential to both the effective verification and optimization of a model.

Keywords: Construction process,Foresight,process modeling,construction simulation,Stroboscope,model complexity,visual insight

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H-J Bargstädt & A Blickling

Implementation of logic for earthmoving processes with a game development engine

Abstract: In modern industry for example the assembly of a car can be done in different ways or sequences. All may lead to success. Nevertheless manufacturers decide on one specific order of processes for the assembly. This order is designed and managed properly and is the result of deeper studies of the logic of the assembly. In the construction industry experiences on site have shown that logic of processes is difficult to be identified. Although there are areas where a logical order of processes can be presumed. This paper tries to setup logic for earthmoving processes and implement it within a computer game development engine. The result is an interactive computer game that allows the user to play the simulation of excavation in real-time.

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Full text: content.pdf (858,029 bytes) (available to registered users only)

Series: w78:2005 (browse)
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Permission to reproduce these papers has been graciously provided by the Technische Universität Dresden.


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