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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 7 Documents
 1 
Search results for , issue "Vol. 42 No. 1 (2010)" : 7 Documents clear
Model and Controller Order Reduction for Infinite Dimensional Systems Fatmawati Fatmawati; R. Saragih; B. Riyanto; Y. Soeharyadi
Journal of Engineering and Technological Sciences Vol. 42 No. 1 (2010)
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.2010.42.1.1

Abstract

This paper presents a reduced order model problem using reciprocal transformation and balanced truncation followed by low order controller design of infinite dimensional systems. The class of systems considered is that of an exponentially stable state linear systems (A, B, C), where operator A has a bounded inverse, and the operator B and C are of finite-rank and bounded. We can connect the system (A, B, C) with its reciprocal system via the solutions of the Lyapunov equations. The realization of the reciprocal system is reduced by balanced truncation. This result is further translated using reciprocal transformation as the reduced -order model for the systems (A, B, C). Then the low order controller is designed based on the reduced order model. The numerical examples are studied using simulations of Euler-Bernoulli beam to show the closed-loop performance.
Adaptive Control with Approximated Policy Search Approach Agus Naba
Journal of Engineering and Technological Sciences Vol. 42 No. 1 (2010)
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.2010.42.1.2

Abstract

Most of existing adaptive control  schemes are designed to minimize error  between  plant  state  and  goal  state  despite  the  fact  that  executing  actions that are predicted to result in smaller errors only can mislead  to non-goal states. We develop an adaptive control scheme that involves manipulating a controller of  a  general  type  to  improve  its  performance  as  measured  by  an  evaluation function. The developed method is closely related  to a theory of Reinforcement Learning (RL) but imposes a practical assumption made for faster learning. We assume  that  a  value  function  of  RL  can  be  approximated  by  a  function  of Euclidean distance from a goal state and an action executed at the state. And, we propose  to  use  it  for  the  gradient  search  as  an  evaluation  function.  Simulation results provided through application of the proposed scheme to a pole -balancing problem using a linear  state feedback controller and fuzzy controller verify the scheme's efficacy.
Fabrication of Microporous Water Filter Using Titanium Dioxide Particles, Silica Particles, and Polyethylene Glycol Aris Priatama; Mikrajuddin Abdullah; Khairurrijal Khairurrijal; Hernawan Mahfudz
Journal of Engineering and Technological Sciences Vol. 42 No. 1 (2010)
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.2010.42.1.3

Abstract

We report the fabrication of microporous filter for use in filtering both inorganic  and  organic  substances  from  liquid  materials.  Titania  (TiO 2)  anatase was  used  as  the  main  material  for  this  filter.  Polyethylene  glycol  (PEG)  with average  molecular  weight  of  20,000  was  also  used  as  additive  to  control  the formation  of  pores,  especially  pore  sizes.  The  mixture  of  titania  and  PEG  was pressed into cylindrical tablet shape at room temperature  and then simply heated inside a furnace up to temperature where the PEG decomposed into gas to leave only connected titania particles. The use of titania as base material for the filter allows  the  organic  substances  that  trapped  inside  the  filter  pores  to  be  easily removed by heating up the used filter at above decomposition temperature of the trapped  organics.  We  also  made  other  filter  by  adding  small  amount  of  silica (SiO2)  particles  to  reduce  the  size  of  the  pores  as  well  as  to  improve  the mechanical  strength.  We  observed  that  filters  containing  silica  particles,  with smaller  in  size  compared  to  titania,  resulted  in  better  mechanical  strength, smaller in pore sizes and better filtering results in term of turbidity and dissolved oxygen (DO) content. This  method is potential for development of larger scale and cheaper water filters for use in various applications.
Analysis and Minimization of Output Current Ripple of Multiphase Carrier-Based PWM Inverters Pekik Argo Dahono
Journal of Engineering and Technological Sciences Vol. 42 No. 1 (2010)
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.2010.42.1.4

Abstract

Analysis  and  minimization  of  output  current  ripple  of  multiphase carrier-based PWM  inverters are presented in this paper.  Analytical expression of rms value of output current ripple of multiphase PWM inverters as a function of the reference signal is first derived. Based on this expression, it is shown that a pure sinusoidal signal is the optimum reference signal that results in minimum output  current  ripple.  Different  to  three-phase  PWM  inverters,  injection  of harmonics  into  the  sinusoidal  reference  signal  is  neither  necessary  nor  useful. The  rms  values  of  output  current  ripple  of  5-,  7-,  and  9-phase  PWM  inverters under various reference signals are compared. Experimental results are included to show the validity of the analysis method.
Geochemical Tracer in Coral as a Sea Surface Temperature Proxy: Records from Jukung Coral S. Y. Cahyarini; J. Zinke
Journal of Engineering and Technological Sciences Vol. 42 No. 1 (2010)
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.2010.42.1.5

Abstract

Sr/Ca  has been analyzed from coral core from the Seribu Islands  reef complex  i.e  Jukung  Island.  SST  from  ERSST  dataset  and  air  temperature measured at Jakarta is used for Sr/Ca calibration. The results show that Jukung Island  coral  Sr/Ca  correlates  better  with  SST  than  with  air  temperature.  A comparison  between  the  Sr/Ca  records  with  the  Nino  3.4  index  shows  that Jukung  coral  sites  indicate  warming  sea  surface  temperatures  during  the beginning  of El Nino  events followed by cooling temperatures at the end of El Nino years.
Tolerance Stack Analysis in Francis Turbine Design Indra Djodikusumo; Koko Suherman; Paskalis Bowo A. Oken
Journal of Engineering and Technological Sciences Vol. 42 No. 1 (2010)
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.2010.42.1.6

Abstract

The  tolerance  stacking  problem  arises  in  the  context  of  assemblies from  interchangeable  parts  because  of  the  inability  to  produce  or  to  join  parts exactly  according  to  nominal  dimensions.  Either  the  relevant  part's  dimension varies around some nominal values  from part to part or the act of assembly that leads  to  variation.  For  example,  as  runner  of  Francis  turbine  is  joined  with turbine shaft via mechanical lock,  there is not only variation in the diameter of runner  and the concentricity between the runner  hole  and  turbine  shaft, but also the  variation in  concentricity  between  the  outer  parts  of  runner  to runner hole. Thus,  there  is  the  possibility  that  the  assembly  of  such  interacting  parts  won't function  or  won't  come  together  as  planned.   Research  in  this  area  has  been conducted and 2 mini hydro Francis turbines (800 kW and 910 kW) have been designed and manufactured for San Sarino and Sawi Dago 2 in Central Sulawesi. Experiences  in  analyzing  the  tolerance  stacks  have  been  documented.  In  this paper it will be demonstrated how the requirements of assembling performance are derived to be the  designed    tolerances  of each interacting component, such  a way that the assembling would be functioning and come together as planned.
Closed Form Solution of Synchronous Machine Short Circuit Transients Gibson H.M. Sianipar
Journal of Engineering and Technological Sciences Vol. 42 No. 1 (2010)
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.2010.42.1.7

Abstract

This  paper  presents  the  closed  form  solution   of  the  synchronous machine  transients undergoing short circuit. That analytic formulation has been derived  based  on  linearity  and  balanced  conditions  of  the  fault.  Even  though restrictive, the proposed method will serve somehow or other as a new resource for  EMTP  productivity.  Indisputably  superior, the  closed-form  formulation has some  features  inimitable  by  discretization  such  as  continuity,  accuracy  and absolute numerical stability. Moreover, it enables us to calculate states at one specific  instant  independent  of  previous  states  or  a  snapshot,  which  any discretization methods cannot do.

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