Turn-milling is a machining method with a system of merging turning and milling operations, which the work pieces and cutting tool perform rotary motion synchronously to optimize the disposal process of chip materials. Development of turn-milling can be done on the lathe and milling conventional machining. The purpose of this study is to modify a conventional lathe with a stationary cutting tool and use a single cutting edge into a rotary tool using 4 (four) cutting sides (multi point cutting). In the manufacture and installation of rotary tool on conventional lathes, tools are made portable and can work on tangential, orthogonal and co-axial turn-milling systems. For the orthogonal and co-axial operating system of the turn-milling are divided into up and down operating systems. In this research the phenomenon of material disposal process of the work-piece surface was investigated. In the process of turn-milling test, the chip was removed automatically as the turn of the cutting edge of the end mill cutting tool. The high decreasing of cutting knife rotation during testing was resulted a space during the process of disposal of material. Sequence, it was occurred pores or cavities in the work-piece
Laboratory of Technology Production, Departement of Mechanical Engineering, Faculty of Engineering, Universitas Riau, Indonesia
We designed a high sensitivity optical biosensor based on Mach-zehnder Interferometer (MZI) by covering the silica waveguide with single atomic layer of graphene material. Graphene was applied to the arm of MZI in certain length. The upper arm was set an important key as the reference signal. The sensor sensitivity was determined mathematically from the power difference launched at the output ports. Our results shows novel optical absorption of hybrid waveguide applied in MZI arm. The presence of sample, which induces the effective index of the hybrid waveguide, significantly changes the phase of light propagation and the power ratio at the output ports which determines the sensitivity. Finally, we showed the effect of the distance between the graphene to the core and the length of graphene on waveguide of MZI.
Department of Mathematics Education, Faculty of Education, UIN Suska Riau, Pekanbaru Indonesia
The exchange rates of four currencies in South Asia depend on the foreign exchange market among those countries. In most cases, the best fitting distribution of exchange rates are found to follow the generalized logistic distribution. Now, we seek for the best distribution to describe the extreme daily exchange rate from 1993 to 2013 for 4 countries in Southeast Asia using the classical and Bayesian methods. We use the maximum likelihood method for classical approach while Generalized Extreme Value (GEV) distribution and Generalized Logistic Distribution for Bayesian approach. The estimation of the three-parameters of extreme values distribution has been compared using goodness-of-fit test. The tests show us that there is no significant difference of parameter estimated between these two distributions. Furthermore, the best distribution for fitting the model of these exchange rates is GEV.
Department of Mathematics, Faculty of Mathematics and Natural Sciences, Universitas Riau, Indonesia
Department of Mathematics, Faculty of Science and Technology, UIN Suska Riau, Pekanbaru, Indonesia
Department of Mathematics Education, Faculty of Education, UIN Suska Riau, Pekanbaru, Indonesia
All electric power cannot be distributed well to consumers caused of Power-Losses caused by technical and untechnical losses. Power-Losses caused by technical issue in Distribution-Network caused-by resistance substance in conductor which is permanent. An ideal conductor must not has resistance, but in reality, every matter has resistance towards electric. Main possibility of Power-Losses in Distribution-Network is natural situation of network itself, such-as length of network always tends to increase. Aim of research is to calculate Power-Losses that absorbed by conductor in Primary-Distribution-Line-20kV with Point-to-Point Sequential Method while it loaded. The highest Power-Losses occurred in conductor OL-Melati Street with RST-Phases are 4766,441 Watt, 4335,654 Watt, 4003,747 Watt, respectively. The biggest Power-Losses is on conductor of OL–Melati Sreet, whereas current and resistance are bigger than others. Total Power-Losses absorbed-by conductor is 72135.99Watt that the smallest losses, obtained from measuring of used real load on each Distribution-Transformer. Percentage of Power-Losses towards used power on Lobak-Feeder 1.3177%.
Department of Electrical Engineering, Faculty of Engineering, Universitas Riau, Indonesia
The tool path optimization is an important issue to get a low cost of manufacture parts using the CNC (Computer Numerical Control) machines. Programming to produce an optimum tool path for CNC machines is a key performance indicator for obtaining minimized machining time and good surface quality of parts. This paper purposes to optimized the CNC tool path generation programming and analyze the cost of manufacturing process of master cylinder piston of motorcycle brake. A Computer Aided Manufacturing (CAM) software was used to simulate an optimal tool path, which finding an efficient solution to shorten the cutting tool path generation. The simulation was performed on a roughing surface process of the work piece using 3 tool path schemes: longitudinal, diametrical and surface to parallel. The each scheme employed tool-path generation based on absolute and incremental reference methods of a CNC lathe machine. An analysis of simulation tool path time for each scheme and machining cost was investigated to get optimum and economies machining process. Hence, it was compared to actual time of machining process on CNC lathe in term of the manufacturing cost machining. The optimal processing time and the most economical cost for making a master cylinder piston of motorcycle brake was a parallel to surface scheme. Therefore, an optimization of tool path generation can minimize machining lead time, which lead to lowest cost of manufacturing parts, with keep maintain product quality.
Department of Mechanical Engineering, Faculty of Engineering, Universitas Riau, Indonesia
Currently, solid desiccant cooling systems (SDCS) is one of the alternatives for utilizing solar energy that helps to resolve environmental and energy issues that results from the use of conventional vapor compression air conditioning systems. The solid desiccant cooling can be maintains required indoor comfort by optimal use of thermal energy with least electrical consumption. But, there is some parameter that must be an investigation when SDCS implemented in a building with different climates. It will be influenced to improve performance and to find the appropriate techniques of SDCS for obtaining thermal comfort in a building. This paper aims to summarize recent research development related to a solid desiccant cooling system and to provide information for potential application for residential building in a tropical climate. The result shows that solid desiccant cooling systems can be adopted and can obtain significant energy saving compared with conventional vapor compression system.
Department of Mechanical Engineering, Universitas Andalas, Indonesia
The usage of petroleum is high and rising as day goes by. The reservoir of this unrenewable energy is getting dried up. The price of petroleum increases rapidly and the needs of alternative sources of energy; a much cleaner energy such as Compressed Natural Gas (CNG) is at urge. CNG is recognized as one of the best solution to substitute fossil fuel and is environmental friendly fuel by the world.The aims of this project are to propose a feasible application of CNG engine for riverine operations and to analyse the feasibility by assessing the stability of using the engine for small boats.Feasibility study can be conducted in many ways such as technical part and costing but this research is only focusing on technical part which is the stability of the newly proposed CNG engine small boat design. A small boat model has to be designed in Maxsurf Modeller after a real small boat has been selected and the stability of the placement of the newly added CNG engine, tanks and related components are designed and assessed using Maxsurf Stability. The produced GZ curves will be compared to the IMO standards A.749 (18) for the code on intact stability chapter 3 for the design criteria for all kinds of ships.
Marine Technology Center, Universiti Teknologi Malaysia, Malaysia
Prediction of resistance of ship level ice is very important in initial stage of ship design due to related to propulsion and engine power of a ship. As model scale test is very expensive therefore an accurate tool is required to predict the resistance of a ship in ice. A semi empirical method to predict ship resistance in level ice based Koto method was presented. The ship resistance consisted of ice breaking force due to flexural strength of ice, submersion force due to buoyancy, friction force contact between ice and hull and loss momentum force due to collision. The simulation results were verified with experimental data of three icebreakers: MT Uikku, Hellay and Araon. The method was also compared with other empirical methods: Lindqvist, Riska, Keinonen and Jeong. It was founded that the average errors using the proposed method was 3 % for MT Uikku, 0.3 % for Hellay and 0.4 % for Araon.
Faculty of Mechanical Engineering, Universiti Teknologi Malaysia, Malaysia
This paper present the strength analysis of COBRA riser due to hydrodynamic load in deep water environment of Sabah offshore. The risers were design under ULS design limit and analyze using LFRD method. The riser was modelled and analyzed using finite element analysis via Orcaflex software with the 100 year return period of typical Sabah offshore metocean data. The analysis consist of Global strength analysis between COBRA riser and Lazy Wave riser, and also Sensitivity Case analysis between configurations of COBRA risers with different depth of sub-surface buoy from sea surface. Based on detailed Global Strength analysis result in this paper concludes that COBRA riser concept has a robust design and it is feasible for 1400 m water depth, in particular for Sabah offshore rather than Lazy Wave SCR. Sensitivity case analysis result in this paper found that the COBRA riser with deepest depth of sub-surface buoy from sea surface has a robust design, this shows that deeper depth of sub-surface buoy from sea surface gives less dynamic effect on the riser due to application of flexible jumper that able to decouple and dampen the energy.
Faculty of Mechanical Engineering, Universiti Teknologi Malaysia, Malaysia
Mooring lines have several types of material which is chain, wire, synthetic fiber rope and hybrid. Mostly, in oil and gas industry is use chain and wire rope as a mooring line for shallow water platform. When exploitation of oil and gas become deep, synthetic fiber is use as an alternative for mooring line. This paper focused discussion on experimental of hybrid mooring lines for deep water mooring line. The tensile tests have been done for preliminary design stage. The test is to identify the material properties of mooring line. At this stage only focus on the steel wire rope with length 200mm and nominal diameter 3mm, 4mm, 5mm and 6mm. Finally, the conclusion and important summaries were presented according to the data collected.
Faculty of Mechanical Engineering, Universiti Teknologi Malaysia, Malaysia
The present study analyzed the influence of turret location to surge, sway, heave, pitch, roll and yaw motions effect on the FPSO Kikeh operating in Kikeh Field. A simulation on FPSO Kikeh with five different turret locations in regular wave and collinear sea states has been carried out. From the analysis on the simulations, it is found that yaw motions become critical as turret distance from bow increases. Besides that, roll motion increases as yaw motion increases and this is due to coupling effect. Turret at bow is the best design for FPSO operating in Kikeh because it has the lowest structure excursion and lowest mooring lines tension. In addition, the environmental force exerted on the structure also low.
Faculty of Mechanical Engineering, Universiti Teknologi Malaysia, Malaysia
This paper describes a numerical study to predict the static hydrodynamic force acting on standar submarine model. The standard submarine model as reported by Mackay1 is employed to simulate the forces acting on the model. The simulation represents the model under the condition when the submarine model is towed in towing tank. A model of virtual towing tank which size similar to the BPPT IHL towing tank is made and the submarine model is put at the middle of the virtual towing tank. The purpose of the numerical simulation is to obtain the static maneuvering forces since IHL is preparing to conduct captive physical model test at towing tank using planar motion mechanism. Several angle of attack of the submarine model starting from -30° up to 30° is simulated to determine the axial force and normal force. Since BPPT also conducted physical model test at BPPT's wind tunnel, the speed of the water flow in the virtual towing tank is determined by the same Reynolds Number used at wind tunnel. The simulation results are compared with the experiments carried out at BPPT's wind tunnel. They show a good tendency between the simulation and wind tunnel.
Researcher, Agency of Assessment and Application Technology BPPT- Indonesia
This Study is concerned with Vortex-induced Motions (VIM) on the SPAR platform using different mooring configurations. VIM on SPAR platform which produces the exciting forces of the vortex shedding on the hull of a bluff body, causing the response near the resonant period of any of the six degrees of freedom (6DOF) motions. SPAR platform is modeled as a rigid body with the dynamic response analysis using Airy’s linear wave theory and modified Morison equation, respectively. Three cases have been conducted using Computational Fluid Dynamics (CFD) simulation as to analyze the behavior of VIM on SPAR platform with different mooring configurations. It was found that, the effect of symmetric mooring configuration on the mean position of the platform is relatively high as the mooring line group is shifted from the wave direction. The highest variation in surge, sway, pitch, heave is found to be more prominent at relative high wave time periods. The tension forces of any mooring system with symmetric configuration decreased as the line graph is shifted away from wave direction.
School of Ocean Engineering, Universiti Malaysia Terengganu, Terengganu, Malaysia
AIS (Automatic Identification System) is an automatic tracking system used by ships and vessel traffic service (VTS) for identifying ship information by electronically exchanging data with other vessels, coastal station, and satelite. AIS can be used to monitor vessels traffic on a strait channel by detecting a large number of vessels and collecting the ships information related to ship static, dynamic and voyage information such as MMSI number, navigation status, rate of turn (ROT), ship speed, ship position, course over ground (COG), ship heading (HDG), time stamp, RAIM flag and radio status at once. On this paper we try to develop an AIS system for vessel traffic monitoring purpose in the Strait of Malacca especially in the Strait of Singapore and Batam Waterways as one of the world’s most congested straits used for international shipping. The method of AIS system development are divided onto 2 stage. Firstly, AIS raw data sent by ships are recorded and decoded as ships information into an application at once. Secondly, the output of AIS decode is used into web based interactive visualization application to visualize the vessels traffic. The development of AIS system has been tested by running the AIS record, decode and web visualisation simultaneously and shown that the system could be applied to real vessel traffic management operating system.
Ship Design and Construction Technology Study Program, Department of Mechanical Engineering, Politeknik Negeri Batam, Batam, Indonesia
Department of Electrical Engineering, Politeknik Negeri Batam, Batam, Indonesia
Department of Informatics Engineering, Politeknik Negeri Batam, Batam, Indonesia
Faculty of Mechanical Engineering, Universiti Teknologi Malaysia (UTM), 81310, UTM Johor Bahru, Malaysia
