15 Articles Published

1. METOCEAN LOADS IN MALAYSIAN WATERS EXTREME VALUE ANALYSIS AND JOINT PROBABILITY

Authors: RYSPEK USUBAMATOV

Abstract: The known gyroscope theory based on principle of the rate change in the angular momentum of a spinning rotor. Practice demonstrates this mathematical model cannot describe other gyroscope effects and shows that there are other unsolved problems, which is spawned steady myth of the gyroscope mystery. These phenomena attract new researchers to solve gyroscope problems. The nature of gyroscope effects is more complex than represented in publications and known mathematical models do not match the actual motions and forces of the gyroscope effects. Latest studies of forces that involved in motions of a gyroscope demonstrate that there are four dynamical components, which act simultaneously and interrelated. The gyroscope with the external torque applied is experienced the resistance torque generated by the centrifugal and Coriolis forces and the precession torque generated by the inertial forces and the rate change of the angular momentum of the spinning rotor. These four dynamical componen

Keywords: gyroscope theory

Pages: 1 - 6 | DOI: 10.15224/978-1-63248-037-8-85

2. PHYSICS OF GYROSCOPE MOTION ABOUT ONE AXIS

Authors: RYSPEK USUBAMATOV

Abstract: The known gyroscope theory based on principle of the rate change in the angular momentum of a spinning rotor. Practice demonstrates this mathematical model cannot describe other gyroscope effects and shows that there are other unsolved problems, which is spawned steady myth of the gyroscope mystery. These phenomena attract new researchers to solve gyroscope problems. The nature of gyroscope effects is more complex that represented in publications and known mathematical models do not match the actual motions and forces of the gyroscope effects. Latest studies of forces that involved in motions of a gyroscope demonstrate that there are four dynamical components, which act simultaneously and interrelated with others. The gyroscope with the external torque applied is experienced the resistance torque generated by the centrifugal and Coriolis forces and the precession torque generated by the inertial forces and the rate change of the angular momentum of the spinning rotor. These four dynami

Keywords: gyroscope theory

Pages: 7 - 12 | DOI: 10.15224/978-1-63248-037-8-86

3. APPLICATION OF THE DIFFIUSE INTERFACE NUMERICAL TECHNIQUE FOR SOLVING THE REDUCED MULTI-COMPONENT MODEL

Authors: AHMED BALLIL , SHABAN JOLGAM

Abstract: Numerical simulation of multi-component flows is a challenging task. It requires dealing with mathematical models, numerical solution techniques, uniformity and nonuniformity of the physical and thermodynamic properties of the flow component and the dynamic changes of the interfaces. In this contribution a numerical application is developed to solve a pressure non-equilibrium multi-component model. The numerical solution is based on a finite volume scheme and the interface is treated as a diffuse zone with a small controlled thickness. Since each flow component has its own pressure, a pressure relaxation procedure is considered during the solution. The code is verified against benchmark tests in one and two dimension flows. The results show very good agreement with the reference data, which proves the capabilities of the developed numerical tools.

Keywords: Compressible multi-component flows, interfaces, Godunov approach, Riemann solvers, pressure relaxation

Pages: 13 - 17 | DOI: 10.15224/978-1-63248-037-8-87

4. HIGH ALTITUDE ROCKET PLUME AND THERMAL RADIATION ANALYSIS

Authors: DONG SUNG HA , JAE HYUN PARK , SEUNG WOOK BAEK , WOO JIN JEON

Abstract: In this study, rocket plume behavior at various altitudes and radiative heat transfer to the base surface is investigated by using DSMC and Finite-volume method for radiation. Rapidly expanded plume with increasing altitude cause the low density transient flow region in the plume. And, because of the decrease of plume temperature and density, the radiative heat transfer to the rocket base surface is also decrease.

Keywords: Rocket Plume, Base Heating, Direct Simulation Monte Carlo(DSMC), Finite Volume Method for radiation (FVM)

Pages: 18 - 22 | DOI: 10.15224/978-1-63248-037-8-88

5. BONE POROSITY MODELING AND FE SIMULATION

Authors: ABDULAZIZ S. AL-ABOODI , ABDULRAHMAN A. AL-NASSER

Abstract: Porosity in bone has many functions, which are decreasing the mass of bone relative to its volume, allow fluid to transfer through bones and give some ductility to the bone material. So that, the artificial bone should include porosity to imitate bone structure. To achieve the porosity functions on artificial bone many requirement should be consider such as material property and structure requirements. Researchers had modeled porosity by either regular or irregular shaped. Irregular shape has been modeled by copying several layers from natural pone CT scan images. Regular porous shape could be design by deferent shapes that confirm the porosity function requirement. The aim of this paper is to propose model that satisfy the function of porosity in real bone and attain the requirement on material and structure

Keywords: Bone, Porosity, Modelling, Finite Element

Pages: 23 - 27 | DOI: 0.15224/978-1-63248-037-8-89

6. MECHANICAL DESIGN AND DEVELOPMENT OF AGRICULTURAL ROBOT

Authors: R.RAJAPPAN , S.SENTHIL , T.BALAJI

Abstract: This paper presents a project developed at the Mailam Engineering college (Tamilnadu-India) aimed at designing, implementing, and testing an autonomous multipurpose vehicle with safe, efficient, and economic operation. This autonomous vehicle moves through the crop lines of a Agricultural land and performs tasks that are tedious and/or hazardous to the farmers. First, it has been equipped for spraying, but other configurations have also been designed, such as: a seeding ,plug platform to reach the top part of the plants to perform different tasks (pruning, harvesting, etc.), and a trailer to transport the fruits, plants, and crop waste.

Keywords: autonomous vehicle, greenhouse, configurations

Pages: 33 - 36 | DOI: 10.15224/978-1-63248-037-8-91

7. ANALYSIS OF THE DELAYS AND FAILURES IMPACT IN THE REMOTE CONTROL SYSTEM DEDICATED FOR THE OPTIONALLY PILOTED AIRPLANE

Authors: ANDRZEJ TOMCZYK

Abstract: In recent years, there has been a rapid development of unmanned aerial vehicles, and one of the classes of these aircraft are Optionally Piloted Vehicles (OPV). This means that manually piloting aircraft by the pilot is adapted to the remote control by an operator in a flight management ground-based center, and to exercise autonomous, automatically controlled flight. For remotely controlled OPV particularly important are delays in the transmission of control signals and the aircraft controllability degradation in case of partial damage of the on-board control system. Influence to the quality of the plane control is taking into consideration. Handling qualities of OPV are important from operator point of view. These proprieties influence to operational performance and flight safety. Specified areas limits of control system degradation are calculated, and a method of partial compensation of the impact of disability is presented. The model-following method was used for control augmentatio

Keywords: Flight control, Optionally piloted airplane

Pages: 37 - 40 | DOI: 10.15224/978-1-63248-037-8-92

8. VORTEX GENERATOR EFFECT ON MITTIGATION OF SEPARATION IN TRANSNIC FLOW NOZZLE

Authors: ALTAB HOSSAIN , AZUDDIN BIN MAMAT , IMTIAZ AHMED CHOUDHURY , NURUN NAHAR

Abstract: Preparation of quality feedstock is critically important for production of quality product through metal injection molding (MIM). This study deals with the optimization of mixing parameters to ensure the homogeneity in feedstock of aluminum powder and high density polyethylene based binder. Experimental design and feedstock preparation was carried out considering three parameters such as powder concentration, mixing temperature and mixing speed. Feedstock rheological characteristic ‘viscosity’ was analyzed through alpha analytical rheometer. The Taguchi analysis was performed for this ‘viscosity’ to find the combination of optimum level of parameters. The results show that 58:42 powder-binder ratio, 120 0C mixing temperature and 43 rpm mixing speed give satisfactory quality of feedstock i.e. minimum feedstock viscosity. A well fit of the optimized parameters was observed through analysis of variance (ANOVA) with higher accuracy using a confidence level of 95%.

Keywords: Metal injection molding, feedstock, optimization, viscosity.

Pages: 55 - 59 | DOI: 10.15224/978-1-63248-037-8-95

9. TOPOLOGY OPTIMIZATION USING INTEGRATED MULTI-POINT APPROXIMATION WITH APPLICATION

Authors: ABDURAHMAN M. HASSEN , HAI HUANG

Abstract: Multi-point approximation (MA) [1] and GA together with two-level multipoint approximation concepts was used. The topology variables of the trusses are optimized, through GA in the external layer of the first level approximation, while the cross-sectional areas of bars are optimized in the internal layer, which is solved by the dual method in the second level approximation. But singularity of MA may take place. The Integrated Multi-point Approximation (IMA) developed by using two approximate functions in two different specified domains, to avoid the singularity, the developed function can be used for both topology and sizing. Its accuracy of the new function studied [2],[3], results were satisfying, for topology optimization and sizing; in this study application examples are demonstrated, to show the validity and the efficiency of the proposal, for topology optimization as well as sizing

Keywords: Structural Optimization, Multi-point approximation, GA, Topology Optimization

Pages: 60 - 66 | DOI: 10.15224/978-1-63248-037-8-99

10. DESIGN OF SPACECRAFT CONTROL SYSTEMS IN THE CLASS OF TWO-PARAMETERIC STRUCTURALLY STABLE MAPPINGS USING LYAPUNOV FUNCTION

Authors: ABDRAKHMANOVA LEILA , OINAROV AZAMAT

Abstract: In this paper, we present a method increasing the potential of robust stability of control systems of spacecraft with an approach to the construction of two-parameter system in the class of structurally stable maps. Research of robust stability is produced by using the method of Lyapunov functions, based on geometric interpretation of the second Lyapunov method and definition of system stability in the state space. For research of the stability of steady states of spacecraft control system we using the ideas of the second method A.M. Lyapunov and define components of the gradient vector of the Lyapunov function. During the research, we will represent Equations of state in deviations relative to the stationary states. The general problem of Lyapunov functions for investigation of the systems with improved capacity of robust stability is defined and a condition of stability is given. We propose a method for construct the control system of spacecraft, built in the two-parameter class of s

Keywords: control system, robust stability, increased potential of robust stability, structurally stable mappings, geometric interpretation.

Pages: 67 - 73 | DOI: 10.15224/978-1-63248-037-8-100

11. MODELLING OF IN-CYLINDER CONVECTIVE HEAT TRANSFER LOSSES TO THE COMBUSTION CHAMBER WALL OF COMPRESSION-IGNITION ENGINE

Authors: ABDUL R. A. AZIZ , MERVIN B. STANLEY , MIOR A. SAID , ZAINAL A. A. KARIM

Abstract: Modelling of heat transfer losses to the engine wall of diesel engine involves the employment of heat transfer correlations in quasi one-dimensional thermodynamic simulation. In this study, four common existing heat transfer correlations - Woshni, Sitkei and Ramaniah, Hohenberg and Assanis - are utilised in a quasi one-dimensional thermodynamic simulation. Results are compared with experimental data from existing literature. The results indicate that Woshni’s correlation shows the best results as it includes a parameter that characterize the bore size of combustion chamber, while others exclude it. Attempt has been made to improve Woschni’s correlation by altering value of constants and power values in the velocity and temperature variables, in order to reduce the error from the experimental results. This finding reveals the current heat transfer correlations have inadequate representation of gas flow characteristics in the correlation especially in the near wall region, where velocity

Keywords: convective heat transfer, correlation, modelling, compression- ignition engine

Pages: 74 - 77 | DOI: 10.15224/978-1-63248-037-8-101

12. NUMERICAL ANALYSIS ON DISTRIBUTIONS OF TEMPERATURE AND FLOW VELOCITY IN AN INERTANCE PULSE TUBE CRYOCOOLER

Authors: JAESOO KIM , JONGWOOK CHOI , KYUNGHWAN LEE , SEONGHYUN HAN

Abstract: The inertance pulse tube cryocooler (IPTC) is well known as one of the most effective cryocooler for the cooling of infrared imaging detectors and superconducting technologies. The reciprocating flow in an IPTC was modeled with a computational thermal fluid dynamics. Two dimensional modeling consists of the flows in the cylinder of compressor, a regenerator, a pulse tube, heat exchangers, an inertance tube, and a gas reservoir. The user-defined function was applied to the compression and expansion stroke of piston in the compressor. It was confirmed that the temperature at the cold heat exchanger decayed to the lowest temperature with an oscillating convergence due to the compression and expansion of piston in the compressor. The spatial distributions of temperature and flow velocity are also compared for the piston at the top dead center and bottom dead center during compression and expansion strokes

Keywords: inertance, pulse tube, cryocooler, reciprocating flow

Pages: 78 - 82 | DOI: 10.15224/978-1-63248-037-8-112

13. EFFECT OF REAGENT INJECTION AMOUNT AND HOLE SIZE ON NOX REDUCTION BY SNCR IN A CO BOILER

Authors: CHUN-LANG YEH

Abstract: This study investigates numerically the NOx reduction by SNCR in a CO boiler. The combustion and fluid flow in the FPC CO boiler is examined with emphasis on the effects of injection amount and hole size of reducing agent on NOx reduction. Simulation results indicate that NOx is formed mainly in the high temperature region near the boiler inlet where the mixing caused by swirler is strong. When reducing agent is injected from the boiler inlet, NOx reduction efficiency increases with the amount of reducing agent but gradually levels off. When the amount of reducing agent is increased to 2.5 times the default value, NOx reduction efficiency is 53%. On the other hand, when reducing agent is injected from 3.6m behind the boiler inlet, NOx concentration is not significantly influenced by the amount of reducing agent injected. Finally, when reducing agent is injected from the boiler inlet, the best NOx reduction efficiency is achieved when the size of reducing agent injection hole is the sma

Keywords: CO boiler; Combustion; Fluid Flow; SNCR; NOx Reduction

Pages: 37 - 42 | DOI: 10.15224/978-1-63248-008-8-85

14. FLOW STUDY AND DESIGN ANALYSIS OF A SAFETY VALVE-VENT PIPE

Authors: MUHAMMAD HANAFI MD SAH , SHEIKH HUSSAIN SHAIKH SALLEH , SRITHAR RAJOO , ALIAS MOHD NOOR

Abstract: Discharge of a large volume of steam from a boiler to atmosphere is a complicated and risky task. It can cause damage to equipment or even injury to personnel in the vicinity. A device was designed, based on the arrangement of a valve and vent pipe junction, such that no excessive load arising from the thermal expansion or reaction induced movement is transmitted back to the valve discharge branch, thus avoiding valve malfunction. Specimens were designed and fabricated to satisfy the actual working conditions. Both air and steam were used in the experimental works. Theoretical and experimental results were then studied on the flow phenomenon of the connection. This study leads to a design analysis of the safety valve-vent pipe. The results have shown good correlations between the theoretical and experimental results and thus lead to the prediction of valve-vent pipe sizing.

Keywords: design, fluid mechanics, process control, product design, safety

Pages: 1 - 9 | DOI: 10.15224/978-1-63248-008-8-79

15. PROPERTIES OF GYROSCOPE MOTION ABOUT ONE AXIS

Authors: RYSPEK USUBAMATOV

Abstract: The known gyroscope theory based on principle of the rate change in the angular momentum of a spinning rotor. Practice demonstrates this mathematical model cannot describe other gyroscope effects and shows that there are other unsolved problems, which is spawned steady myth of the gyroscope mystery. These phenomena attract new researchers to solve gyroscope problems. The nature of gyroscope effects is more complex than represented in publications and known mathematical models do not match the actual motions and forces of the gyroscope effects. Latest studies of forces that involved in motions of a gyroscope demonstrate that there are four dynamical components, which act simultaneously and interrelated. The gyroscope with the external torque applied is experienced the resistance torque generated by the centrifugal and Coriolis forces and the precession torque generated by the inertial forces and the rate change of the angular momentum of the spinning rotor. These four dynamical componen

Keywords: gyroscope theory

Pages: 1 - 6 | DOI: 10.15224/978-1-63248-037-8-85