Journal of Ocean, Mechanical and Aerospace -science and engineering- (JOMAse)
The mission of the JOMAse is to foster free and extremely rapid scientific communication across the world wide community. The JOMAse is an original and peer review article that advance the understanding of both science and engineering and its application to the solution of challenges and complex problems in naval architecture, offshore and subsea, machines and control system, aeronautics, satellite and aerospace. The JOMAse is particularly concerned with the demonstration of applied science and innovative engineering solutions to solve specific industrial problems. Articles preferably should focus on the following aspects: new methods or theory or philosophy innovative practices, critical survey or analysis of a subject or topic, new or latest research findings and critical review or evaluation of new discoveries. Scope The JOMAse welcomes manuscript submissions from academicians, scholars, and practitioners for possible publication from all over the world that meets the general criteria of significance and educational excellence. The scope of the journal is as follows: Naval Architecture and Offshore Engineering Computational fluid dynamic and Experimental Mechanics Hydrodynamic and Aerodynamics Noise and Vibration Aeronautics and Satellite Engineering Materials and Corrosion Fluids Mechanics Engineering Stress and Structural Modeling Manufacturing and Industrial Engineering Robotics and Control Heat Transfer and Thermal Power Plant Engineering Risk and Reliability Case studies and Critical reviews
Articles
329 Documents
Study on Structural Deflection in Attitude Maneuvers of Flexible Satellite Equipped with Fuel-Efficient Input Shaper
Parmana, Setyamartana
Journal of Ocean, Mechanical and Aerospace -science and engineering- Vol 24 No 1 (2015): Journal of Ocean, Mechanical and Aerospace -science and engineering- (JOMAse)
Publisher : International Society of Ocean, Mechanical and Aerospace -scientists and engineers- (ISOMAse)
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DOI: 10.36842/jomase.v24i1.436
Input shaping technique can successfully suppresses residual vibration in slew maneuvers of flexible systems. This paper studies transient structural deflections of flexible satellite during attitude maneuvers controlled using input shaper. The satellite consists of a rigid main body and two symmetrical flexible solar panels. The equations of motion of the satellite are derived using Lagrange’s formulation, and elastic motions of flexible structures are discretized following the finite element method. The attitude maneuvers areequipped with on-off constant amplitude inputs. For fast maneuver, the satellite has poor accuracy after the maneuver. To resolve this issue, input shaper is applied to maneuver the satellite. Various fuel-efficient shaped inputs are studied in order to conclude the relation of input shape and transient maximum deflection resulted.
Estimation of Capacity and Center of Weight of Traditional Ship, Bagan Siapiapi
Yohanes, Yohanes;
Badri, Muftil;
Damanik, Pindo Evans Manuel
Journal of Ocean, Mechanical and Aerospace -science and engineering- Vol 24 No 1 (2015): Journal of Ocean, Mechanical and Aerospace -science and engineering- (JOMAse)
Publisher : International Society of Ocean, Mechanical and Aerospace -scientists and engineers- (ISOMAse)
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DOI: 10.36842/jomase.v24i1.435
On traditional manufactures fishing boats in Indonesia, especially in the shipyard at Bagan Siapiapi, on Riau province usually made by rely on the ability of inherited tradition and hereditary not based on function and their designation. Example that way still used when determine capacity and center of gravity. This research aims to study capacity and center gravity of ship nets at Bagan Siapiapi using computer simulations. On this method some of data about capacity, center of gravity, drawing design and construction of ships would to be studied systematic and accurate base on practical condition. That case would be studied and validate on the one shipyard industry at Bagan Siapiapi. Some result from this study are (1) Capacity of ship nets 7093 kg and the weight is 13401.04 kg on the full condition. (2) Center weight of ship nets at X = 0.7mm; Y = 888.5mm; and Z = -162.5 mm. (3) Stability of ship nets on the without load has a smaller tilt angle compare than the full load condition.
Hydrodynamic Effects of the Length and Angle of the Ducted Propeller
Majdfar, Sohrab;
Ghassemi, Hassan;
Forouzan, Hamid
Journal of Ocean, Mechanical and Aerospace -science and engineering- Vol 25 No 1 (2015): Journal of Ocean, Mechanical and Aerospace -science and engineering- (JOMAse)
Publisher : International Society of Ocean, Mechanical and Aerospace -scientists and engineers- (ISOMAse)
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DOI: 10.36842/jomase.v25i1.434
Ducted propellers used in many vessels, especially fishing vessels, trawlers and submarine which provide the higher efficiency. In this article, the effects of the duct length and duct angle are investigated on the hydrodynamic performance. First, did the modeling of duct 19A. The Kaplan propeller performance with nozzle 19A by turbulence model of SST-K-w analyzed and validated with experimental results that indicate acceptable accuracy. Finally, by changing the nozzle at a rate of 10% and 20% of the original length of the nozzle and also change the angle of the nozzle, analyzed the effects of the changes made. The Kaplan propeller with 19A nozzle is selected for case study. A Reynolds Average Navier-Stokes (RANS) turbulence model of the SST-K- w employed for the present calculations. Numerical results are included pressure distribution, hydrodynamic characteristics and velocity behind the propeller at various geometry and physical conditions. Comparisons of the results are shown with acceptable agreement by the experimental data. It is concluded that the position of the propeller and increasing the duct angle inside the duct may be limited.
Evaluation of Mechanical Properties and Wear Behavior of Aluminium-Red Mud Composite Synthesized By Powder Metallurgy.
Chinta, Neelima Devi;
Selvaraj, N.;
Mahesh, V.
Journal of Ocean, Mechanical and Aerospace -science and engineering- Vol 25 No 1 (2015): Journal of Ocean, Mechanical and Aerospace -science and engineering- (JOMAse)
Publisher : International Society of Ocean, Mechanical and Aerospace -scientists and engineers- (ISOMAse)
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DOI: 10.36842/jomase.v25i1.433
Red mud received from NALCO, Odisha, India has been subjected for sieve analysis and milled to 42 nanometers using high energy ball mill. Pure aluminium powder of 99.72% purity as matrix with red mud as reinforcement at 2%, 4%, and 6% weight fractions at micro as well as nano levels. Micro and nano structured red mud powders and pure aluminium are mixed in a V-blender, compacted at a pressure of 40 bar and samples are prepared by conventional sintering. The mechanical properties of Aluminium-Red mud micro and nano composites are evaluated with respect to hardness and compression strength. The experimental compression strength values are validated by Deform-2D software. An increase in hardness and compression strength is observed with increase in the amount of percentage weight fraction of Red mud. Wear characteristics are investigated using pin-on-disc wear testing machine and evaluated the prediction of optimal combination of pure aluminium and weight fraction of micro and nano structured red mud powder using Regression analysis. Highest wear resistance is observed for the test specimen with 42 nm size and 6% weight fraction of red mud powder at 600 RPM speed.
Analysis of Design for Assembly (DFA) in Waste Separation Machine of Ferromagnetic and Non-Ferromagnetic Material
Arief, Dodi Sofyan;
Ilyandi, Rifki;
Abidin, Tekad Indra Pradana;
Hamzah, Amir
Journal of Ocean, Mechanical and Aerospace -science and engineering- Vol 25 No 1 (2015): Journal of Ocean, Mechanical and Aerospace -science and engineering- (JOMAse)
Publisher : International Society of Ocean, Mechanical and Aerospace -scientists and engineers- (ISOMAse)
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DOI: 10.36842/jomase.v25i1.432
Design for Assembly (DFA) is one of method in the assembly systems to ease the assembly during simultaneous process from the beginning until become new products of the whole components. However, the obstacles in assembly process could be occurred in waste separation machine. Therefore, in order to obtain the optimization of assembly process, it is needed to conduct an analysis of component design before the production. DFA analysis will obtain the value of assembly efficiency. The efficiency value of prototype machine will achieve a way to separate the waste, both ferromagnetic and non-ferromagnetic materials. Furthermore, efficiency value theoretically on assembly of waste separation machine is 14.22% at 548.47seconds. The efficiency value of waste separation machine after assembly process in actual condition is 11.83% at 658.88seconds. The distinction efficiency value is caused by difficulties in assembly of the belt roller and sub assembly of base support on motor. As consequences, the time to get assembly will take more time on actual condition rather than theoretically.
Modification and Testing System Control and Swing Model Excavator System
Nazaruddin, Nazaruddin;
Suhandi, Anang
Journal of Ocean, Mechanical and Aerospace -science and engineering- Vol 25 No 1 (2015): Journal of Ocean, Mechanical and Aerospace -science and engineering- (JOMAse)
Publisher : International Society of Ocean, Mechanical and Aerospace -scientists and engineers- (ISOMAse)
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DOI: 10.36842/jomase.v25i1.431
One of the heavy equipment that play role in development projects is the excavator. An excavator can perform construction work such as digging, splitting, loading and so on. Laboratory of Hydraulics and Pneumatics Mechanical Engineering Faculty of Engineering, University of Riau has produced a model excavator using pneumatic system, support on a controller box, equipped with buttons setting and motion rotary swing 120°. The research has modifications control system, remove the control box under the excavator and change to the remote system. The motion rotary swing system has changed from 120° to 360°. The purpose is all movements similar in general excavator. The result, excavator model using power 12V DC the control system and compressed air drive pneumatic system. The results of testing control system work to properly, the rotary motion of the swing system 360° and use electric voltage 7,5V will have speed 13,598 rpm, so swing motion from the excavator model similar in general.
Determination of the Lift and Drag of 2D Planing Flat Plate Riding on the Free Surface
Rezaei, Amin;
Ghassemi, Hassan;
Noshadi, Esmail
Journal of Ocean, Mechanical and Aerospace -science and engineering- Vol 26 No 1 (2015): Journal of Ocean, Mechanical and Aerospace -science and engineering- (JOMAse)
Publisher : International Society of Ocean, Mechanical and Aerospace -scientists and engineers- (ISOMAse)
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DOI: 10.36842/jomase.v26i1.430
The behavior of planing hull is very similar to planing flat plate. So to treat the planing hull performance at moderate Froude number, 2D planing flat plate was analyzed in different Froude number between 0.5 and 1. Finite volume, using ANSYS-CFX v14 software with RNG turbulence model was used to simulate planing plate. The numerical results of the pressure distribution, free surface profile, lift and drag at different AOAsare presented and discussed.Present calculations are compared with Kramer et al [7] results and show almost good agreement.
Rock Mass, Geotechnical and Rock Type Identification Using SASW and MASW Methodsat Kajang Rock Quarry, Semenyih, Selangor Darul Ehsan
Kausarian, Husnul
Journal of Ocean, Mechanical and Aerospace -science and engineering- Vol 26 No 1 (2015): Journal of Ocean, Mechanical and Aerospace -science and engineering- (JOMAse)
Publisher : International Society of Ocean, Mechanical and Aerospace -scientists and engineers- (ISOMAse)
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DOI: 10.36842/jomase.v26i1.429
Rockmass characterization study at Kajang Rock quarry wasperformed usingSpectral Analysisof Surface Waves (SASW) and Multichannel Analysis of Surface Waves (MASW) methods. RockQuality Designation (RQD) can be measured in the field directly. Discontinuity and processing survey methods determinedfrom 4 locations that have been examined in this study area. Based on MASW and SASW methods, velocity of S waves (Vs) can be obtained and weathering grade of rock mass has beenclassified. Location 1 consists of 5 weathering zones, SASW data indicates surface wave velocity (Vs) obtained from 198 m/s to 2044 m/s, MASW (Vs) ranges obtained from 2400 m/s. Location 2 consists of 4 weatheringzones, (Vs) of SASW obtained from 592 m/s to 2271 m/sand (Vs) of MASW obtained from 400 to 2000 m/s. Location 3 consists of 4 weathering zones with (Vs) of SASW obtained from 512 m/s to 2465 m/s and (Vs)of MASW obtained from 400 to >1200 m/s. Location 4 consists of 5 weathering grades with (Vs) of SASW obtained from the 200 m/s to 2040 m/s and (Vs) of MASW obtained from 300 to >2300 m/s. Rock Quality Designation (RQD) in Location 1 shown the rockquality is excellent (98.63%), in Location 2, RQD shows the rock is good (98.38%), in Location 3 RQD shows the rock is excellent (99.03%), in Location 4 RQD shows the rock is excellent (96.43%).
Undercarriage Design of Excavator Model in Application of Various Track Drive
, Nazaruddin;
, Kiki;
, Gunawan
Journal of Ocean, Mechanical and Aerospace -science and engineering- Vol 26 No 1 (2015): Journal of Ocean, Mechanical and Aerospace -science and engineering- (JOMAse)
Publisher : International Society of Ocean, Mechanical and Aerospace -scientists and engineers- (ISOMAse)
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DOI: 10.36842/jomase.v26i1.428
The excavator is the units of the heavy equipment that serves the physical development sectors such as mining excavations in the area, establishing or expanding roads and expand agricultural land and other physical development. One part of the excavator that has a very large role in the undercarriage. Undercarriage is a component of the heavy equipment that serves as a driver and has a track drive right and left track drive. This research was conducted with the aim to make modeling as excavators in general by using materials available in the market. Next, calculate the speed, direction of turn with a different variation of the track (ceramic, asphalt, soil) and the maximum tilt angle that can be achieved by the excavator. From the test data and calculations have been carried out with 3 times the gear reduction is obtained without load speed excavator bucket is 0.25 m/s while using a load of 1.5 kg bucket excavator speed is 0.24 m/s at the track ceramics. While the direction of maximum inflection occurs on the track with a diameter ceramic to turn right for 995 mm and 782 mm turn left. At the maximum angle of incline can be obtained at 10 degrees.
Failure Assessment Diagram Constraint Used for Integrity Analysis of Cylindrical Shell with Crack
Akbar, Musthafa;
Setiawan, Rachman
Journal of Ocean, Mechanical and Aerospace -science and engineering- Vol 27 No 1 (2016): Journal of Ocean, Mechanical and Aerospace -science and engineering- (JOMAse)
Publisher : International Society of Ocean, Mechanical and Aerospace -scientists and engineers- (ISOMAse)
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DOI: 10.36842/jomase.v27i1.427
During itsoperation time, cylindrical pressure vessel could experience cracks. If this happens, the question is raised whether the pressure vessel could still be used or not, moreoever whether further treatment is required. In process and petroleum industry, an integrity analysis using Fitness For Service methodology is common, for instance referring to API 579/ASME FFS-1 2007 Code. Level 3 assessment within the Code requires a finite element simulation in order to generate both the evaluation point and the Failure Assessment Diagram (FAD) that serves as an acceptance criteria. Here, a parametric study based on the methodology given by the Code has been carried out to generate such result for the cases of internal longitudinal crack defect in a cylindrical shells for a number of common cases, in terms of thickness-to-radius ratio, crack size ratio, and crack aspect ratio. The evaluation of Stress Intensity Factor is determined through J-integral parameter found using a finite element analysis with a specially-meshed strategy incorporating the crack. The result of the model is first verified with that of the Code for a number of cases, before being used for parametric study. The model yields a relatively close comparison with that of the Code. A number of regressed equation was derived for several cases, and proposed to be used in integrity assessment of cylindrical shell. A procedure of using the parametric study result from this investigation is also outlined here.