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C-J Liang, S-C Kang

Development of a Steel Beam Hauling System for Automatic Steel Beam Assembly

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Series: w78:2014 (browse)
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Chao L C

Simulation of construction operation with direct inputs of physical factors

Abstract: The deterministic approach to estimating the production rate of a construction operation assumes constant midpoint physical attributes without addressing the effect of randomness of job conditions. On the other hand, most simulation models bypass physical factors and rely on secondorder inputs of probability distributions of task times, the judgements of which have been cited as difficult for users to make. This paper presents an alternative approach to production estimation, based on simulating directly the effects of changing job factors on task times, while addressing the probabilistic nature of construction. The neural network model is used as the computing mechanism for determining the cycle times of the equipment in given conditions and provides the basis for estimation. The obtained times are then fed directly into a discrete-event simulation model to simulate the process and establish the production capacity of the system as constrained by first-order factors. The approach is illustrated using a hypothetical excavating and hauling operation while the object-oriented programming technique is used to implement the computing procedure.

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Full text: content.pdf (72,259 bytes) (available to registered users only)

Series: w78:1999 (browse)
Cluster: papers of the same cluster (result of machine made clusters)
Class: class.analysis (0.027295) class.software development (0.021146) class.software-machine (0.005241)
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Permission to reproduce these papers has been graciously provided by the Research Press of the National Research Council of Canada. The support of the editors, particularly Dr. Dana Vanier, is gratefully appreciated.


Martinez J C

EarthMover - simulation tool for earthwork planning

Abstract: Earthwork projects are performed in an environment fraught with uncertainty and using expensive machines that interact in complex ways. While the planning of these projects can be improved significantly with discrete-event simulation modeling, most projects are still planned using traditional tools. Recent advances in general-purpose simulation tools for construction operations modeling, such as STROBOSCOPE, enable accurate and detailed modeling of any complex operation. These tools, however, demand a level of training that is beyond that which can be found in most current construction practitioners. Special-purpose simulators bring the benefits of simulation modeling to users with little or no training by providing a modeling environment that is very close to the problem and geared towards a narrow domain. This paper presents EarthMover, a special-purpose simulation-modeling tool for planning and estimating earth-moving operations. The paper explores the use of EarthMover as a state-of-the-art simulation-modeling tool that allows construction practitioners to model complex earthwork operations in detail. EarthMover supports model definition via an interactive graphical interface where users drag and drop elements such as road segments, bridges, and loading and hauling units. In addition, EarthMover produces static and dynamic output. The static output includes numerous graphs and tables that describe the performance of the system in detail. The dynamic output includes an animation of the simulated system where the loading and hauling units can be seen moving about the site as they perform construction. The animation serves as a verification, validation, presentation, and credibility tool. The paper also presents the tools and techniques that were used to build EarthMover. These tools and techniques can be readily used to build other special-purpose simulators for building construction as well as for other types of heavy construction. The tools include STROBOSCOPE as a simulation engine, Visio for the graphical and interactive model definition, and Proof Animation for the dynamic output. The techniques include Visual Basic programming and OLE automation.

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Full text: content.pdf (120,295 bytes) (available to registered users only)

Series: w78:1998 (browse)
Cluster: papers of the same cluster (result of machine made clusters)
Class: class.man-software (0.033643) class.environment (0.010932) class.strategies (0.006121)
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Permission to reproduce these papers has been graciously provided by Royal Institute of Technology, Stockholm, Sweden. The assistance of the editors, Prof. Bo-Christer Björk and Dr. Adina Jägbeck, is gratefully appreciated.


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