Because of the need to safely vent exhaust gases, most engine dynamometer facilities are not well suited to measuring engine exhaust orifice noise. Depending on the location of the dyno facility within the building, the exhaust system may need to be extended in order to properly vent the exhaust fumes. This additional ducting changes the acoustic modes of the exhaust system which will change th...

Today, researchers exploit hybrid craft more than they used to be. The main reason is that they need to high speed as well as extra portability. For instance, a famous hybrid craft is named Hysucat, was designed through the combination of catamaran and hydrofoil. Catamarans, a type of multihull boats, have always considered by designers because of their simultaneous supply of high speed and sta...

The European Commission is examining test procedures to ensure that light-duty vehicle emissions are well controlled both in real use and over the legislative test cycle. At the same time, the UN Working Party on Pollution and Energy (GRPE) has developed a Worldwide harmonised Light vehicles Test Procedure (WLTP) that is expected to be used for Type Approval in the EU in the future. To identify...

nergy efficiency is a global goal in the fight against warming. Research on reducing drag one of ways to improve energy efficiency. The research method used injection micro-sized bubbles and ultra-fine barge ship model. Microbubble Drag Reduction (MBDR) Ultrafine Bubble (UFBDR) are two methods that can play an essential role surface ship's hull. Factors affect effectiveness these ratio, locatio...

A comparison between towing tank testing and full-scale CFD simulations is presented at three different target speeds. For the current self-propulsion simulation, point was obtained using polynomial interpolation. The studies of boundary layer thickness, a basic grid uncertainty assessment verification were performed to give some confidence application simulation. All are commercial software ST...

The paper presents a detailed study of certain working regimes TV2-117A turboshaft engine, based on practical research using experimental data following the engine run tests. tests were made into test bench, hydraulic dynamometer to vary load free power turbine and measure main parameters, by operating dynamometer, different are obtained. To accomplish tests, execution an additional instrumenta...

The results from resistance measurements in calm water and load-varying self-propulsion tests regular head following waves are presented. experimental campaign is conducted the large towing tank at SINTEF Ocean (formerly MARINTEK). openly accessible hull of single screw Duisburg Test Case selected as test case. wave added resistance, ship motions RAOs, axial wake fraction, thrust deduction rela...