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Development of Shallow Footing Anti-Ram bollard System Through Modeling and Testing

Transactions of Tianjin University 2006年第B9期12卷 46-50页

作者： CRAWFORD John E Karogozian & Case 2550 N.Hollywood WaySuite 500BurbankCA 91505USA

In past terrorist attacks, vehicle borne improvised explosive devices (VBIED) have been the primary manner of attacking buildings and infrastructures. Preventing unauthorized vehicles from approaching a protected area with anti-ram systems would maintain an established standoff distance against moving and stationary vehicles and consequently reduce blast and debris threats. This strategy has been considered the first line of defence against terrorists. Several types of anti-ram devices have been developed in accordance with U. S. Department of State K-rating criteria, for example, wedge barriers, rising beams, sliding/swing gates, and drop arms. However, these devices typically need a deep foundation for installation and can't be implemented into many locations where a depth of excavation is limited in order to protect utility lines of buildings and infrastructures. This paper presents a recent development of a series of shallow footing anti-ram bollard systems (SFABS) that can satisfy K-12 rating with only five-inch thick footing. A high-fidelity physics based finite element technique with a vehicle crash model is used for predicting anti-ram capacity and determining design parameters of the SFABS. Full-scale vehicle crash tests of the developed SFABS systems have been carried out to validate the design and analysis.

关键词： anti-ram bollard shallow footing crash testing finite element analysis

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Numerical Evaluation of Rudder Performance Behind a Propeller in bollard Pull Condition

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Journal of Marine Science and Application 2018年第2期17卷 153-164页

作者： Diego Villa Michele Viviani Giorgio Tani Stefano Gaggero Dario Bruzzone Carlo Bonvino Podenzana Department of Electrical Electronics and Telecommunication Engineering and Naval Architecture– DITENUniversity of Genova16145 GenoaItaly

Correct evaluation of rudder performance is a key issue in assessing ship *** paper presents a simplified approach based on a viscous flow solver to address propeller and rudder *** flow solvers have been applied to this type of problems,but the large computational requests limit(or even prevent)their application at a preliminary ship design *** on this idea,a simplified approach to include the propeller effect in front of the rudder is considered to speed up the *** on the concept of body forces,this approach enables sufficiently fast computation for a preliminary ship design stage,therebymaintaining its *** define the limitations of the proposed procedure,an extensive analysis of the simplified method is performed and the results are compared with experimental data presented in the ***,the reported results show the capability of the body-force approach to represent the inflow field to the rudder without the full description of the propeller,also with regard to the complex bollard pull ***,the rudder forces are satisfactorily predicted at least with regard to the lift ***,the drag force evaluation ismore problematic and causes higher ***,these discrepancies may be accepted due to their lower influence on the overall ship maneuverability performance.

关键词： Rudder-propeller interaction RANS Body forces Actuator disk bollard pull

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维普期刊数据库

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Experimental Study of the Collective and Cyclic Pitch Propeller for an Underwater Vehicle

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Journal of Marine Science and Application 2018年第4期17卷 592-602页

作者： Minh Tran Jonathan Binns Shuhong Chai Alex Forrest Hung Nguyen Australian Maritime College College of Sciences and EngineeringUniversity of Tasmania Department of Civil and Environmental Engineering University of California

A series of experimental studies of the innovative propulsor named Collective and Cyclic Pitch Propeller(CCPP) applied to an underwater vehicle were designed and performed at the Australian Maritime College, University of Tasmania. The bollard pull and captive model tests were conducted to investigate the characteristics of CCPP and to examine the effect of different parameter settings to its performance. The results show that the CCPP is able to generate effective manoeuvring forces in various operational condition. In addition, the obtained results in the form of force coefficients provide a useful empirical model for the simulation and control of an underwater vehicle equipped with this propulsor.

关键词： Collective and cyclic pitch propeller Underwater vehicle propulsion Towing tank test bollard pull test Captive model test Autonomous underwater vehicle

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