A dynamometer capable of emulating linear, nonlinear and discontinuous loads for rotating systems is described. The controllable load is produced by a servo drive system. Applications for the dynamometer are steady state load tests and dynamical load tests with linear, non-linear or discontinuous loads for testing of electrical machines in variable speed drive systems. The configuration of the ...

Reducing the added resistance in waves has become a crucial aspect of today’s ship design. The is traditionally considered proportional to square wave height. However, this assumption believed be only partly valid, and further investigations are required. In present study, experimental tests numerical simulations were carried out determine regular head DTC hull (the scale factor 135). analysis ...

Experimental testing of physical turbines, often at a smaller scale, is an essential tool for engineers to investigate fundamental design parameters such as power output and efficiency. Despite issues with scaling blockage which are caused by limitations in size flow velocity the test facilities, experimental tank laboratory environments perceived offering more control thus trustworthier result...

This paper presents the design and experimental results of a new type developable added bulbous bow that has been designated as dihedral bow. is based on polyhedral bows are used in small vessels, whose origin traced to 1990s. The designed with set surfaces following previous methodology surface considers material properties can contain boundary curves. Two designs their towing tank tests prese...

Bulk carriers have an important role in international maritime transport. In this paper, we carried out a numerical study on a model of bulk carrier vessel and calculated total resistance of the model. A model of a bulk carrier vessel with length of 2.76 m, breadth of 0.403 m and draught of 0.173 m was selected for numerical modeling. Numerical work was done by commercial CFD software ANSY...

Hull roughness increases ship frictional resistance and, thus, results in economic and environmental penalties. Its effect has been prevalently predicted using the similarity law scaling procedure. However, this method not yet validated with experimental data a model ship. This study presents an investigation into of on provides validation scaling, by tank testing flat plate Both were tested sm...

Hull form selection, resistance and powering are important in designing underwater vehicle. An vehicle bare hull is based on the five parameters due to interaction between propeller hull. When they running surface condition, there will be problems likely as vessel, but main of below waterline with low freeboard. The vehicles operating high speed at a Froude Number. Therefore, wave making compon...

this study describes the design, construction and calibration of an adjustable three-point hitch dynamometer. the dynamometer frame design was based on an inverted u-shaped frame that was mounted between the tractor links and implement. the dynamometer frame design allows for use in both category i and ii three-point hitch systems because of its flexibility in a lower point hitch spread and mas...