This study explains the performance analysis of a propulsion system engine of an LNG tanker using a combined cycle whose components are gas turbine, steam turbine, and heat recovery steam generator. The researches are to determine the total resistance of an LNG tanker with a capacity of 125,000 m3 by using the Maxsurf Resistance 20 software, as well as to design the propulsion system to meet the required power from the resistance by using the Cycle-Tempo 5.0 software. The simulation results indicate a maximum power of the system of about 28,122.23 kW with a fuel consumption of about 1.173 kg/s and a system efficiency of about 48.49% in fully loaded conditions. The ship speed can reach up to 20.67 knots.

Reduced thrust or derate has been practiced commonly nowadays as a standard procedure of takeoff. Since power is being used at maximum during takeoff phase, the practice has many benefits for the operation of aircraft. Not only it reduced fuel consumption during the takeoff phase, but also reduced engine’s wear and tear that caused by stress and a very high temperature. Exhaust Gas Temperature (EGT) is one of the most important parameters that used to monitor the engine deterioration. There is a definite correlation between reducing takeoff thrust and EGT reduction, where both values are contradicting one another. However, there must be some calculation by the flight crew on how much percentage of derate is eligible prior to takeoff. The goal of this paper is to find the effectiveness of derate to reduce EGT in order to improve performance, prolong engine life and reduce operating costs of the operators.

Landing gear design of this commuter aircraft was developed from the previous model, to carry more passengers. The total load of the aircraft will increase as passenger capacity increases. With a variety of runways in Indonesia, it is necessary to have a good landing gear performance for landing on a paved and unpaved runway. Performance of the landing gear design is analyzed through kinematics and dynamics methods. Main concern of this analysis is to find the capability of the landing gear shock absorber to damp the vibration response due to the impact of the landing gear system with the wavy surface of the unpaved runway, as well as the actuator ability as the extension and retraction mechanism driver. The analysis concluded that the landing gear design capable to perform during landing on a paved and unpaved runway, with a modification of the shock absorber and actuator design.

No abstract

The study of earthquake resistance design on cyclotron bunkers using base isolators was introduced. With the increasing trend of detection and treatment of cancer using nuclear technology in Indonesia, the construction of nuclear medicine facilities which include the manufacture of radiopharmaceuticals using a cyclotron facility must be held immediately. With the many areas in Indonesia in earthquake-prone areas, a cyclotron bunker design is needed that can accommodate the effects of the earthquake. The cyclotron bunker must be able to withstand earthquake loads without damage because apart from being a building structure, concrete also acts as shielding radiation during cyclotron operations. Base isolators have become a reliable technology in overcoming earthquake loads and will be used in cyclotron buildings in earthquake areas. By using the spectrum response method in the cyclotron building, the results of the base isolator will be evaluated. It was found that building acceleration after adding base isolators decreased 37% and base isolators also increased the vibration period of cyclotron bunkers away from the earthquake period.