The Experts below are selected from a list of 294 Experts worldwide ranked by ideXlab platform
Ivana Hreljac - One of the best experts on this subject based on the ideXlab platform.
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S-Lay Pipe Laying optimization using specialized PSO method
Structural and Multidisciplinary Optimization, 2017Co-Authors: Stefan Ivić, Siniša Družeta, Ivana HreljacAbstract:The paper deals with the optimization of the S-Lay submarine Pipe-Laying. The considered Laying model is based on a nonlinear elastic beam model with elastic contact interactions with rigid structures of roller supports and the seabed, solved in the Abaqus software. The optimization problem is formulated so as to determine the main parameters of Pipe-Laying. In order to maximize the efficiency of the optimization procedure, a specialized Particle Swarm Optimization variant is developed. The introduced δ -PSO employs an additional displacement of agent positions, through which the optimization is directed towards solutions based on offshore engineering practice. Two different cases of submarine Pipe Laying were used for testing. In these tests, the specialized PSO was compared to standard PSO and Mesh Adaptive Direct Search, which it both outperformed. The δ -PSO specialization is easy to implement in PSO or other swarm intelligence methods, and hopefully can provide similar improvements in other applications.
Chenglin Ni - One of the best experts on this subject based on the ideXlab platform.
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Reconfigurable control of Pipe-Laying vessels after sensor faults
2015 IEEE International Conference on Mechatronics and Automation (ICMA), 2015Co-Authors: Mingyu Fu, Mingyang Li, Lingling Yu, Chenglin NiAbstract:A new method for the control reconfiguration of Pipe-Laying vessels after sensor faults is described. The Pipe-Laying vessel is a kind of special operation vessel coordinated with dynamic positioning system. The new reconfiguration approach uses a virtual sensor as a reconfiguration block that permits to keep the nominal controller in the loop. A systematic procedure for virtual sensor design is presented that guarantees Lyapunov stability theory. The feasible and effective of the proposed approach is experimentally verified in the simulation of a Pipe-Laying vessel.
Stefan Ivić - One of the best experts on this subject based on the ideXlab platform.
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S-Lay Pipe Laying optimization using specialized PSO method
Structural and Multidisciplinary Optimization, 2017Co-Authors: Stefan Ivić, Siniša Družeta, Ivana HreljacAbstract:The paper deals with the optimization of the S-Lay submarine Pipe-Laying. The considered Laying model is based on a nonlinear elastic beam model with elastic contact interactions with rigid structures of roller supports and the seabed, solved in the Abaqus software. The optimization problem is formulated so as to determine the main parameters of Pipe-Laying. In order to maximize the efficiency of the optimization procedure, a specialized Particle Swarm Optimization variant is developed. The introduced δ -PSO employs an additional displacement of agent positions, through which the optimization is directed towards solutions based on offshore engineering practice. Two different cases of submarine Pipe Laying were used for testing. In these tests, the specialized PSO was compared to standard PSO and Mesh Adaptive Direct Search, which it both outperformed. The δ -PSO specialization is easy to implement in PSO or other swarm intelligence methods, and hopefully can provide similar improvements in other applications.
X. Huang - One of the best experts on this subject based on the ideXlab platform.
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cad integrated excavation and Pipe Laying
Journal of Construction Engineering and Management-asce, 1997Co-Authors: X. Huang, Leonhard E. BernoldAbstract:Excavation and, in particular, trenching using backhoes represents a hazardous working environment for workers. The hazards include trench walls that collapse, the accidental drop of heavy objects into the opening, excavators and other equipment that become unstable, and buried utilities that are damaged during the operation. The three main accident prevention efforts used today are the use of the trench box, inspection, and the training of the site personnel. The work discussed in this paper is the result of a search for a more revolutionary prevention method: one that does not require a worker to enter the open trench. This paper presents the development and testing of a computer-aided design (CAD) integrated trenching and Pipe-Laying system. The successful testing of the first prototype could lay the foundation for safer and more productive trenching operations in the future.
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CAD-INTEGRATED REAL-TIME CONTROL FOR ROBOTIC EXCAVATION AND Pipe-Laying: DEVELOPMENT AND TESTING
1997Co-Authors: Leonhard E. Bernold, X. HuangAbstract:Trenching excavation and Pipe-Laying are, without a doubt, some of the most dangerous operations in construction. More than 200 people a year, in the United States alone, are killed during these operations. Machines that can reduce or eliminate the exposure of humans to these risks have the highest potentials to change the present situation. This research project was initiated under the contract between the Federal Highway Administration and North Carolina State University in order to develop and evaluate the concept of spatially integrated excavation. The research team had access to three important hardware components: 1) a robotic excavator in the laboratory; 2) a John Deere 690C backhoe excavator equipped with electronic transducers for measuring joint angles; and 3) the ODYSSEY, a laser based spatial positioning system that was integrated with the excavator. The overall goal of this project was to prove the technical feasibility and effectiveness of laser-based spatial position control under real-world conditions. In addition, innovative technologies for the detection of buried metal obstacles and the Laying of large Pipes without the need for humans in the trench were successfully tested. It is believed that the results of this research project lay the foundation for a dramatic reduction in the number of casualties caused by collapsing trenches, ruptured gas Pipes, etc. Additionally, a variety of other benefits can be gained. For example, the automatic establishment of as built drawings, reduction of damaged utilities, increase of productivity due to the quantity of materials to be excavated (to meet Occupational Safety and Health Administration requirements), and finally, the reduction of errors.
Mingyu Fu - One of the best experts on this subject based on the ideXlab platform.
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Reconfigurable control of Pipe-Laying vessels after sensor faults
2015 IEEE International Conference on Mechatronics and Automation (ICMA), 2015Co-Authors: Mingyu Fu, Mingyang Li, Lingling Yu, Chenglin NiAbstract:A new method for the control reconfiguration of Pipe-Laying vessels after sensor faults is described. The Pipe-Laying vessel is a kind of special operation vessel coordinated with dynamic positioning system. The new reconfiguration approach uses a virtual sensor as a reconfiguration block that permits to keep the nominal controller in the loop. A systematic procedure for virtual sensor design is presented that guarantees Lyapunov stability theory. The feasible and effective of the proposed approach is experimentally verified in the simulation of a Pipe-Laying vessel.