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Journal of Engineering and Technological Sciences
Published by Institut Teknologi Bandung
ISSN : 23375779     EISSN : 23385502     DOI : -
Core Subject : Engineering,
Engineering
Journal of Engineering and Technological Sciences welcomes full research articles in the area of Engineering Sciences from the following subject areas: Aerospace Engineering, Biotechnology, Chemical Engineering, Civil Engineering, Electrical Engineering, Engineering Physics, Environmental Engineering, Industrial Engineering, Information Engineering, Mechanical Engineering, Material Science and Engineering, Manufacturing Processes, Microelectronics, Mining Engineering, Petroleum Engineering, and other application of physical, biological, chemical and mathematical sciences in engineering. Authors are invited to submit articles that have not been published previously and are not under consideration elsewhere. Starting from Vol. 35, No. 1, 2003, full articles published are available online at http://journal.itb.ac.id, and indexed by Scopus, Index Copernicus, Google Scholar, DOAJ, GetCITED, NewJour, Open J-Gate, The Elektronische Zeitschriftenbibliothek EZB by University Library of Regensburg, EBSCO Open Science Directory, Ei Compendex, Chemical Abstract Service (CAS) and Zurich Open Repository and Archive Journal Database. Publication History Formerly known as: ITB Journal of Engineering Science (2007 – 2012) Proceedings ITB on Engineering Science (2003 - 2007) Proceedings ITB (1961 - 2002)
Arjuna Subject : -
Articles 1,267 Documents
 60   61   62   63   64 
Comparison of Eight Month Coastal Polluted Porcelain and Epoxy Resin Outdoor Insulators Waluyo Waluyo; Ngapuli I. Sinisuka; Parouli M. Pakpahan; Suwarno Suwarno; Maman A. Djauhari
Journal of Engineering and Technological Sciences Vol. 40 No. 2 (2008)
Publisher : Institute for Research and Community Services, Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/itbj.eng.sci.2008.40.2.4

Abstract

This study  presents the experimental results of eight months naturally coastal polluted outdoor porcelain  and  epoxy resin  insulators. The experiments were leakage current and applied high voltage measurements used a two-channel storage  digital  oscilloscope,  in  the  hermetically  sealed  chamber,  where temperature,  humidity ,  pressure  and  applied  voltage  could  be  adjusted  and measured simultaneously. The leakage current waveforms were analyzed using FFT  and  the  relation  to  environmental  parameters  were  analyzed  using correlation  matrix  of  multivariate  statistical  tools.  It  was  also  conducted  SEM and EDAX tests. Base  on  the  correlation  coefficient  matrix, the humidity  contributed  to  leakage current  amplitude  and  phase  angle  on  the  porcelain  insulator   were  very significant,  with  the  correlation  coefficient  were  0.60  and  -0.68  respectively. Whereas,  on  polluted  epoxy  resin  insulator,  the  humidity  did  not  influence  to leakage  current  and  phase  angle  considerably.  Generally,  the  surface  became rougher than  the new one. The most three  chemical elements in pollutants  were chlorine, silicon and ferrum.
Development Study of Turbulent κ-ε Model for Recirculation Flow III: Two Dimension Recirculation Flow in a Reservoir M. Syahril B. Kusuma
Journal of Engineering and Technological Sciences Vol. 41 No. 1 (2009)
Publisher : Institute for Research and Community Services, Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/itbj.eng.sci.2009.41.1.1

Abstract

An assessment of recirculation flow in Jatiluhur reservoir is conducted based on two dimensions turbulent κ-ε model. The numerical model was developed using finite difference method where hydrodynamic equation was solved by the combination of Mc Cormack and splitting methods. The κ-ε equation is solved using quickest scheme in convection term, central scheme in diffusion term and Euler scheme in reaction term. The simulations were done for maximum incoming flow during the rainy season and the dry season. Model results are compared to field measurement from which it is found that rainy season scenario has shown better agreement. Maximum incoming flow released in the rainy season could generate a boundary layer greater average velocity and more recirculation flow than that in the dry season. Further development is required to get more accurate results for the case with less average velocity.
Development of Intelligent Controller with Virtual Sensing Yul Y. Nazaruddin; Puji Astuti
Journal of Engineering and Technological Sciences Vol. 41 No. 1 (2009)
Publisher : Institute for Research and Community Services, Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/itbj.eng.sci.2009.41.1.2

Abstract

In  many  industrial  plants,  some  key  variables  cannot  always  be measured on-line and for the purpose of control, an alternative of sensing system is  required.  This  paper  is  concerned  with  a  development  of  an  alternative intelligent  control  strategy,  which  is  an  integration  between  the  neuro-fuzzy based  controller  and  virtual  sensing  system.  This  allows  an  immeasurable variable to be inferred and used for control. The  virtual sensor is  composed of the  Diagonal  Recurrent  Neural  Network  (DRNN)  for  plant  modeling  and  the Extended  Kalman  Filter  (EKF)  as  the  estimator  with  inputs  from  DRNN.  The integration between virtual sensor and the controller enables a development of an on-line  control  scheme  involving  the  immeasurable  variable.  The  real -time implementation  demonstrates  the  applicability  and  the  performance  of  the proposed  intelligent  control  scheme,  especially  in  dealing  with  nonlinear processes.
Synthesis and Activity Test of Cu/ZnO/Al2O3 for the Methanol Steam Reforming as a Fuel Cell’s Hydrogen Supplier IGBN Makertihartha; Subagjo Subagjo; Melia Laniwati Gunawan
Journal of Engineering and Technological Sciences Vol. 41 No. 1 (2009)
Publisher : Institute for Research and Community Services, Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/itbj.eng.sci.2009.41.1.3

Abstract

The  synthesis  of  hydrogen  from  hydrocarbons  through  the  steam reforming  of  methanol  on  Cu/ZnO/Al2O3  catalyst  has  been  investigated.  This process is assigned to be one of the promising alternatives for  fuel cell hydrogen process source. Hydrogen synthesis from methanol can be carried out by means of  methanol  steam  reforming  which  is  a  gas  phase  catalytic  reaction  between methanol and water. In this research, the  Cu/ZnO/Al2O3  catalyst  prepared by the dry  impregnation  was  used.  The  specific  surface  area  of  catalyst  was  194.69 m2/gram.The  methanol  steam  reforming  (SRM)  reaction  was  carried  out  by means of the injection of gas mixture containing methanol and water with 1:1.2 mol ratio and 20-90 mL/minute feed  flow rate to a fixed bed reactor loaded by 1 g of catalyst. The reaction temperature was 200-300 °C, and the reactor pressure was 1 atm. Preceding  the reaction, catalyst was reduced in the H2/N2  mixture at 160  °C.  This  study  shows  that  at  300  °C  reaction  temperature,  methanol conversion  reached  100%  at  28  mL/minute  gas  flow  rate.  This  conversion decreased  significantly  with  the  increase  of  gas  flow  rate.  Meanwhile,  the catalyst prepared for SRM  was stable in 36 hours of operation at 260  °C. The catalyst exhibited a good stability although the reaction condition was shifted to a higher gas flow rate.
Set Up and Calibration of a Spatial Tool for Simulating River Discharge of Western Java in Recent Decades: Preliminary Results and Assessments Poerbandono Poerbandono; Philip J. Ward; Miga M. Julian
Journal of Engineering and Technological Sciences Vol. 41 No. 1 (2009)
Publisher : Institute for Research and Community Services, Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/itbj.eng.sci.2009.41.1.4

Abstract

This  paper  discusses  a  study  of  the  application  of  global  spatiotemporal climate datasets and the hydrological model STREAM   (Spatial Tools for River Basin Environmental Analysis and Management Options). In the study, set up and calibration  of STREAM for  the reconstruction of monthly discharge for several locations in the western part of Java, Indonesia, for the period 1983 -2002 are carried out. The set up includes the preparation of monthly precipitation and temperature datasets, a digital elevation model of the domain being studied, and maps of land cover and soil water holding capacity. Discharge observations from  six  stations  located  mostly  in  the  upper  parts  of  major  watersheds  in  the domain  are  used  to  calibrate  the  model  by  comparing  simulated  and  observed discharge variables. The model performs reasonably well.  Comparison  between computed and observed mean monthly discharges yield correlation coefficients ranging from 0.72 to 0.93. The  computed mean annual discharge in five out of six  observation  stations  ranges  between  -8  and  5%  with  respect  to  the  mean annual  observed  discharge.  This  study  offers  a  tool  which  can  be  used  for reconstructing historical discharge
Pressure Drop Correlation Covering Dilute to Dense Regimes of Solid Particle-Gas Flow in a Vertical Conveying Pipe Yazid Bindar; N. A. Sutrisniningrum; D. Santiani
Journal of Engineering and Technological Sciences Vol. 41 No. 1 (2009)
Publisher : Institute for Research and Community Services, Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/itbj.eng.sci.2009.41.1.5

Abstract

More  general  correlations  between  pressure  drop  and  gas-solid  flow variables are developed from the present experimental data. The correlation was modeled  for  a  pneumatic  conveying  system  in  a  vertical  pipe.  The  transition boundary  between  dense  and  dilute  regimes  is  constructed  from  the  pressure drop correlations. The gas-solid particle flow variables are quantified by the gas Reynolds  (Nref)  and  the  solid  Froude  (Frp)  numbers.  The  dense  flow  regime  is indicated  by  the  decrease  of  the  pressure  drop  with  the  increase  of  the  gas Reynolds  number.  In  contrary,  the  dilute  regime  exhibits  the  increase  of  the pressure  drop  with  the  gas  Reynolds  number.  The  proposed  correlations  were built at the range of gas Reynolds number f from 360 to 500 and solid Froude number from 0,01 to 0,02.
Decision Support System for Selection of Suitable Mariculture Site in the Western Part of Java Sea, Indonesia W. Windupranata; R. Mayerle
Journal of Engineering and Technological Sciences Vol. 41 No. 1 (2009)
Publisher : Institute for Research and Community Services, Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/itbj.eng.sci.2009.41.1.6

Abstract

Mariculture (marine aquaculture) has been intensified and has created essential  employment  opportunities  over  the  last  two-decades  in  Indonesia,  as well as many other countries in the world. This development has negative impact to  the  environment.  Considerable  amounts  of  nutrient  waste  in  dissolved  and particulate  form  were  released  by  intensive  fish  farming  into  the  environment through  feed  excess,  soluble  fish  excretion  and  faeces  production.  One  of  the first steps to  avoid the dangerous environmental impacts is careful site selection to  minimize  environmental  impacts  arising  from  the  farming  activities (sustainability) as well as to guarantee adequate conditions from the operational point of view (suitability).The paper focuses on the development of a Decision Support System  (DSS) as a tool for the appropriate selection of mariculture   site location. The DSS is based on  physical,  chemical  and  sediment  criteria  as  well  as  on  data  of  conflicting coastal use. The GIS analysis results in a map indicating the suitable areas for the improved  method  of  offshore  cage  mariculture.  In  this  study,  emphasis  was placed on finfish species; however the methods and results may be employed for other species as well following some modifications.The DSS was applied for the  western part of Java Sea, Indonesia. The data were acquired  from  direct  field  measurement,  numerical  modeling  and  existing information  from  particular  agencies.  Numerical  modeling  was  used  to  obtain spatial  and  temporal  distributions  of  hydrodynamic  parameters  (i.e.  current velocities  and  water  levels).  The  Delft3D  modeling  system  (Delft  Hydraulics, The Netherlands) was employed for this purpose. The DSS was developed under GIS  application  of  ESRI®  ArcGISâ„¢  using  weighted  overlay  method.  The results  showed  the  adequacy  of  the  system  for  supporting  governmental authorities in the implementation, environmental controlling, and estimation  of overall carrying capacity for environmental sustainable marine fish farming.
Geometry Effect Investigation on a Conical Chamber with Porous Media Boundary Condition Using Computational Fluid Dynamic (CFD) Technique Yazid Bindar
Journal of Engineering and Technological Sciences Vol. 41 No. 2 (2009)
Publisher : Institute for Research and Community Services, Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/itbj.eng.sci.2009.41.2.1

Abstract

The present study is an attempt to introduce  a  method for optimizing the  geometry  of  a  unit  process.  The  comprehensive  unit  process  performances are generated by a  CFD engine. The CFD engine can simulate the unit process performances  at  whatever  conditions.  Both  design  geometry  and  operating variables were used on the CFD simulation. The burden on a simplified process was taken out from CFD simulation. A complex geometry of a unit process is represented  by  a  secondary  reformer.  A  secondary  reformer  has  a  conical chamber  as a space to undergo  a  combustion reaction before entering  a  catalyst bed. This complexity is added by the boundary  on a  porous solid surface as the top surface of  the catalyst bed. The  conical  angle affects the flow pattern inside the  conical chamber  having a porous solid surface as its  base. The  conical  angle above  65° results  the  disappearing  of  the recirculation  flow.  The  inlet  distance from  the  porous  solid  surface  also  can  exhibit  different  characteristics  of recirculation  flow.  The  closer  the  distance  to  the  porous  solid  surface,  the stronger the recirculation is. The inlet velocity values have no significant effect on  the  flow  pattern.  The  introduction  of  a  solid  volume  inside  the  geometry creates distortion in the flow pattern. In the application, the inserted solid volume is equivalent to a burner. It means that the use of the burner inherently produces some problems of the flow distribution.
Vortex-induced Vibration of a Flexible Free-hanging Circular Cantilever R. W. Prastianto; K. Otsuka; Y. Ikeda
Journal of Engineering and Technological Sciences Vol. 41 No. 2 (2009)
Publisher : Institute for Research and Community Services, Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/itbj.eng.sci.2009.41.2.2

Abstract

The  behavior  of  a  free-hanging  riser  of  floating  offshore  structures would be different from  a  typical at-sea-floor-terminated riser type of oil or gas platforms.  For the design purpose, the present study  was intended to incorporate some  important  factors  of the riser conditions  (i.e.  bidirectional vibration,  freeend condition, and spanwise variation of response amplitude) for investigating its dynamics  characteristics.  An  experimental  investigation  on  time-dependent motion  of  a  flexible free-hanging circular cantilever  subjected to uniform crossflows has been carried out.  The  free-end condition  cantilever has  a  34.4  aspect ratio  and  a  low  mass ratio  of  about  1.24. The  cylinder  freely  oscillates in both inline  and  transverse  to  the  flow.  Reynolds  number  varied  from  10,800  to 37,800.  The "jump  phenomenon"  was found in the inline motion  of the cylinder that agrees well with an existing  comparable work.  At high flow velocities, the 3rd  higher  harmonic  frequencies  of  the  cylinder  transverse  response  became predominant that produce quite different motion  characteristics  compared to the other  existing  comparable  works  with  2-dimensional  bottom-end  condition. Generally, the results suggested that the flexible free-hanging cantilever generate different  vortex  wake  mode  than  either,  a  uniform  (a  short-rigid  flexiblymounted cylinder) or a linear amplitude variation along the span  case (a  pivoted cylinder)
A Field Observation on Lightning Performance Improvement of Overhead Distribution Lines Reynaldo Zoro; Ryan Mefiardhi; Syarif Hidayat; Redy Mardiana
Journal of Engineering and Technological Sciences Vol. 41 No. 2 (2009)
Publisher : Institute for Research and Community Services, Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/itbj.eng.sci.2009.41.2.3

Abstract

Two feeders of 20 kV overhead distribution lines which are located in a high lightning density area are chosen to be observed as a field study due to their  good  lightning  performance  after  improvement  of  lightning  protection system.  These  two  feeders  used  the  new  overhead  ground  wire  and  new  line arrester  equipped  with  lightning  counter  on  the  main  lines.  The  significant reduced  of  lines  outages  are  reported.  Study  was  carried  out  to  observe  these improvements  by  comparing  to  the  other  two  feeders  line  which  are  not improved and not equipped yet with the ground wire and line arrester. These two feeders  located  in  the  nearby  area.  Two  cameras  were  installed  to  record  the trajectory of the lightning strikes  on the improved lines. Lightning peak currents are  measured  using  magnetic  tape  measurement  system  installed  on  the grounding  lead  of  lightning  arrester.  Lightning  overvoltage  calculations  are carried out by using several scenarios based on observation results and historical lightning data derived from lightning detection network. Lightning overvoltages caused by indirect or direct strikes are analyzed to get the lightning performance of  the  lines.  The  best  scenario  was  chosen  and  performance  of  the  lines  were improved significantly by installing overhead ground wire and improvement of lightning arrester installation. 

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