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Tae-Hwan Joung, Hyeung-Sik Choi, Sang-Ki Jung, Karl Sammut and Fangpo He

ABSTRACT

This paper examines the suitability of using the Computational Fluid Dynamics (CFD) tools, ANSYSCFX, as an initial analysis tool for predicting the drag and propulsion performance (thrust and torque) of a concept underwater vehicle design. In order to select an appropriate thruster that will achieve the required speed of the Underwater Disk Robot (UDR), the ANSYS-CFX tools were used to predict the drag force of the UDR. Vertical Planar Motion Mechanism (VPMM) test simulations (i.e. pure heaving and pure pitching motion) by CFD motion analysis were carried out with the CFD software. The CFD results reveal the distribution of hydrodynamic values (velocity, pressure, etc.) of the UDR for these motion studies. Finally, CFD bollard pull test simulations were performed and compared with the experimental bollard pull test results conducted in a model basin. The experimental results confirm the suitability of using the ANSYS-CFX tools for predicting the behavior of concept vehicles early on in their design process.

Open access

M. Sangeetha and S. Prakash

Abstract

Aluminium based metal matrix composites are widely used in automobile components such as cardan shaft of Chevrolet corvette, disc brake and engine push rod. In this experiment a Hybrid Metal Matrix Composites (HMMC) are fabricated and drilled. Drilling is the process of making slots in disc brake and thread in the engine parts. The surface quality of the drilled specimen depends on the speed, feed, drill type and the thrust force. Thrust force plays the major role in drilling the specimen. In this experiment HMMCs are fabricated using two processes-called, sonication and casting. Sonication is the process of coating the carbon nanotubes over the silicon carbide particles (SiCp). Semisolid stir casting is used to reinforce the coated SiCp in the LM 25 alloy. A drilling process is performed on HMMC to analyse the extent to which the input parameters influence the thrust force and Ovality. The tools used for drilling are solid carbide tools of three different diameters. Taguchi’s experimental design is adopted for the drilling operation. A mathematical model is used to determine the influence of input parameters on the outputs thrust force and ovality. This paper proves the combination of N3, f1 and d1 of the carbide tool results in the lowest value of thrust force and ovality while drilling HMMCs. In this work the HMMC is prepared by coating the abrasive nature, silicon carbide particle and there is a good interfacial bonding between the reinforced particle and matrix and the drilling process becomes smoother. The new being of this article is the treated ceramics, SiCp with carbon nanotubes. This HMMC shows the improved mechanical properties compared to other metal matrix composites surveyed in the literatures.

Open access

Reddy Sreenivasulu and Chalamalasetti Srinivasa Rao

. 2089-2102. [8] Karri, V., 1999. “Thrust and Torque Predictions in Drilling Operations using Neural Networks” Advanced Manufacturing Process, Systems and Technologies, pp. 257-266. [9] Sanjay, C., Jyothi, C., 2006. “The Study of Surface Roughness in Drilling using Neural Networks and Mathematical Model,” The International Journal of Advanced Manufacturing Technology, 29 (9-10), pp. 846-852. [10] Singh, A.K., Panda, S.S., Pal, S.K., and Chakraborty, D., 2006. “Predicting Drill Wear using an Artificial Neural Network,” International Journal of Advanced

Open access

Toshimitsu Morizane, Keisuke Tsuruya, Noriyuki Kimura and Hideki Omori

attractive force of linear induction motor in a novel maglev system driven by the source including high frequency component. Proc. LDIA 2003, ML-07 (2003). [9] Takahashi I., Ide Y., Decoupling Control of Thrust and Attractive Force of a LIM Using a Space Vector Control Inverter. IEEE Trans. IA 29(1): 161-167 (1993). [10] Kotani Y., Morizane T, The Dynamic Characteristics of LIM Using Disc-Shaped Secondary Side Converted into Linear Motion. Proc. of ICEM 2012 (2012). [11] Iwaki K., Morizane T., Kimura N., Taniguchi K

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S. Sakipova and A. Jakovics

Abstract

Under the conditions of continuous increase in the energy consumption, sharply rising prices of basic energy products (gas, oil, coal), deterioration of environment, etc., it is of vital importance to develop methods and techniques for heat and power generation from renewables. The paper considers the possibility to use a sail-type wind turbine for autonomous power supply in Latvia, taking into account its climatic conditions. The authors discuss the problems of developing a turbine of the type that would operate efficiently at low winds, being primarily designed to supply power to small buildings and farms distant from centralized electricity networks. The authors consider aerodynamic characteristics of such a turbine and the dependence of the thrust moment of its pilot model on the airflow rate at different angles of attack. The pilot model with a changeable blade shape has been tested and shows a good performance.

Open access

Krzysztof Karaskiewicz and Marek Szlaga

References [1] Karassik I., Messina J., Cooper P., Heald C.: Pump Handbook, Fourth Edition, McGraw-Hill Prof., 2008. [2] Stepanoff A. J.: Centrifugal and Axial Flow Pumps: Theory, Design, and Application, John Wiley & Sons, 1957 also Krieger Publishing Company, 1992. [3] Agostinelli A., Nobles D., Mockridge C. R.: An Experimental Investigation of Radial Thrust in Centrifugal Pumps, ASME J. Eng. Power, 80, 1960, pp. 120-126. [4] Biheller H. J.: Radial Forces on the Impeller of Centrifugal Pumps with Volute, Semivolute, and Fully Concentric Casings, ASME

Open access

Harish Kumar, Anil Kumar and Poonam Yadav

References Kruh, D., Benaim, N., Moscovitch, A. (1994). Computerized calibration system. Measurement , 13, 225-233. Yee, K. W. (1992). Automation of Strain Gauge Load cell Force Calibration . US Department of Commerce, Gaithersburg. GTM Gassmann Theiss Messtechnik GmbH (2010). GTM Force Manager User's Guide . Germany. Jain, K. K., Jain, S. K., Dhawan, J. K., Kumar, A. (2005). Realization of force scale upto 50 kN through dead weight force machines at NPL

Open access

Sung-Soo Kim, Soon-Dong Kim, Donghoon Kang, JongHyun Lee, Seung Jae Lee and Kwang Hyo Jung

ABSTRACT

The purpose of this research is to compare and analyze the advanced speed of ships with different rudder controller in wavy condition by using a simulation. The commercial simulation tool named AQWA is used to develop the simulation of ship which has 3 degree of freedom. The nonlinear hydrodynamic force acting on hull, the propeller thrust and the rudder force are calculated by the additional subroutine which interlock with the commercial simulation tool, and the regular wave is used as the source of the external force for the simulation. Rudder rotational velocity and autopilot coefficients vary to make the different rudder controller. An advanced speed of ships depending on the rudder controller is analyzed after the autopilot simulations.

Open access

Reza Shamsi and Hassan Ghassemi

ABSTRACT

The present paper deals with the problems of yaw angle effects on podded propulsor performance. The study aims at providing insights on characteristics of podded propulsors in azimuthing condition. In this regard, a wide numerical simulation that concerned yaw angle effect measurement on podded propeller performance was performed. The Reynolds-Averaged Navier Stokes (RANS) based solver is used in order to study the variations of hydrodynamic characteristics of podded propulsor at various angles. At first, the propeller is analyzed in open water condition in absence of pod and strut. Next flow around pod and strut are simulated without effect of propellers. Finally, the whole unit is studied in zero yaw angle and azimuthing condition. Structured and unstructured mesh techniques are used for single propeller and podded propulsor. The performance curves of the propeller obtained by numerical method are compared and verified by the experimental results. The characteristic parameters including the torque and thrust of the propeller, the axial force and side force of unit are presented as function of velocity advance ratio and yaw angle. The results shows that the propeller thrust, torque and podded unit forces in azimuthing condition depend on velocity advance ratio and yaw angle.