Applied Mechanics and Materials Vols. 799-800

Abstract: As the vessel operates in the rough open seas, a marine diesel engine simulator which engine rotation is controlled to transmit through propeller shaft is a new methodology for the self-propulsion tests to track the fuel saving in a real time. Considering the circumstance, this paper presents the real time of marine diesel engine simulator system to track the real performance of a ship through computer-simulated model. A mathematical model of marine diesel engine and the propeller are used in the simulation to estimate fuel rate, engine rotating speed, thrust and torque of the propeller thus achieve the target vessel’s speed. The input and output are real time control system of fuel saving rate and propeller rotating speed representing the marine diesel engine characteristics. The self-propulsion test simulation results in calm water [7] were compared to validate the present marine diesel engine simulator. The present simulator then was used to evaluate the fuel saving by employing a new mathematical model of turbocharged marine diesel engine and was applied to a full scale target vessel. The control system developed will be beneficial for users as to analyze different condition of vessel’s speed to obtain better characteristics and hence optimize the fuel saving rate.

Abstract: Variable swash plate compressors recently have been used to improve fuel efficiency and SCM 435 or UNS C67300 were used as the material to manufacture them.As a result of structure analysis through static analysis that used ANSYS, SCM 435 currently being used was found structurally safe as it has that maximum stress is within the allowable range of their material property. Therefore, UNS C67300 was found to generate better fuel efficiency than the existing SCM 435 through structure analysis for automotive variable swash plate air conditioning compressor.

Abstract: The paper is focused on the ionization current measurement in the cylinder SI engine during an engine cycle. Briefly describes the problems and lists reference sources, which are several possible ways of measuring the ionization current during the working cycle. Paper also provides information regarding the proposed scheme of measuring devices and mentions functional test equipment.

Abstract: Not only for aircraft performance calculations and trajectory predictions but also for air traffic management simulation tools and operational equipment, accomplishment of an accurate propulsive model for transport aircraft has a crucial priority and is a remarkable topic for aircraft industry. In the literature, there are very few propulsive modeling studies; furthermore, the demand for an accurate thrust model still remains unfulfilled. In this study, a new turbofan engine propulsive model determining the relationship between thrust, flight altitude, and Mach number was developed by using genetic algorithms (GAs) method and multilayer feed-forward neural networks (FNNs) utilizing Levenberg-Marquardt (LM), delta-bar-delta (DBD), and conjugate gradient (CG) learning algorithms. Estimated thrust values by the derived models showed a good fitting with actual thrust data for both models, which validated each model’s accuracy.

Abstract: This paper presents the application of bond-graph modeling for investigation of the microjet engine in cold starting mode. In this model, the idea of simultaneous usage of the compressed air and electric starter is developed to perform the starting process. For this purpose, the microjet engine is assembled by components which is provided by the engine manufacturer, then a monitoring system in Labview software is developed. Dynamic modeling of the engine cold starting phase is performed by bond graph approach and simulated in 20-sim software. So, the allowable air pressure to inject during the starting process is calculated. The simulation results are then compared with experimental data where a good agreement is observed. These results support the proposed model for further analysis to improve the performance of engine start-up process.

Abstract: Exhaust gas heat utilization in the form of Thermal Energy Recovery (TER) has attracted a major interest due to its potentials with Internal Combustion Engines (ICE). Recovering useful energy, for example in the form of electrical power from the engine exhaust waste heat could benefit in the form of direct fuel economy or increase in the available electric power for the auxillary systems. The methodology in this paper includes the assessment of each waste heat recovery technology based on the current research and development trends for automotive application. It also looked into the potential for energy recovery, performances of each technology and factors affecting its implementation. Finally, the work presents an Electric Turbo Compounding (ETC) simulation using a Ford Eco-Boost as a baseline engine modeled with the 1-Dimensional AVL Boost software. A validated 1-D engine model was used to investigate the impact on the Brake Specific Fuel Consumption (BSFC) and Brake Mean Effective Pressure (BMEP) at full load. This paper presents some reviews on the turbo-compounding method and also the modelling efforts and results of an electric turbo-compounding system. Modelling shows that the turbo-compounding setup can be more beneficial than turbo-charging alone.

Abstract: Because of an increasing world-energy demand, water-flooding is not the practical technology to produce more oil due to the high interfacial tension or IFT. To achieve this, enhanced-oil-recovery (EOR) technique like alkaline-flooding becomes more significant. For alkaline-flooding by sodium hydroxide, in-situ surfactant is created between the alkaline solution and the organic acids in oil to reduce IFT thus making oil flow easily. Consequently, the objective of this research is to investigate the effects of alkaline concentration, brine salinity, temperature and pressure on oil production and to measure the IFT from rising drop method for oil in Thailand. The results show that IFT is reduced from 37 to 0.2 mN/m with the increases of temperature, alkaline concentration and brine salinity. However, pressure has less effect on IFT reduction. The results can be applied to use as pre-flooding approach to reduce IFT along with water-flooding for oil recovery with lower cost.

Abstract: In this report it is being discussed approaches for designing the SnO₂ and In₂O₃ ozone sensors based on the film parameters optimization. It was considered the influence of the conditions of the SnO₂ and In₂O₃ films deposition by spray pyrolysis method and the parameters of those films on operating characteristics of ozone sensors. Main factors, controlling operating characteristics of thin film ozone sensors were determined. Recommendations to process of the SnO₂ and In₂O₃ films deposition, promoting an attainment of optimal operating gas sensing properties, were formulated.

Abstract: A new SPR sensor surface based onself-assembled-Calix [4] arene-derivative-monolayer was proposed for the detection of sodium in water. The immobisation of claixarene onto the gold surface was confirmed by impedance spectroscopy (EIS). Three alkaliions were used K⁺, Na⁺ and Ca²⁺ and the influence of pH on ions detection was studied and optimized. The Calix [4] arene-gold SPR sensor developed was characterized by low limit of detection (LOD) for about 10^-10 M, high sensitivity and wide linear detection range between 10^-6M and 10^-14M.

Abstract: The new fabrication method of dielectric membrane structures for sensitive elements of gas sensors, based on the separation of anisotropic etching of silicon into two stages, is proposed. The preference etchant compositions, the preference elemental composition of membrane films and the acceptable thickness of the thermal silicon oxide underlay to obtain mechanically relaxed membranes are presented. The group technology for manufacturing of sensitive elements for gas sensors is developed, membrane structures are fabricated and their properties are studied.