Volume: 4
Number: 2
July-December 2005

To see an article directly, click its Title. To see abstract, click its [Abstract] link.

• EFFECT OF AIR PREHEATING ON EXHAUST EMISSIONS IN A DI DIESEL ENGINE
  Md. Nurun Nabi, Mhia Md. Zaglul Shahadat
  Abstract PDF
  EFFECT OF AIR PREHEATING ON EXHAUST EMISSIONS IN A DI DIESEL ENGINE
  Md. Nurun Nabi, Mhia Md. Zaglul Shahadat

  Abstract

  In this work diesel combustion and exhaust emission with neat diesel fuel and diesel kerosene blends are investigated in a four-stroke neturally aspirated (N/A) direct injection (DI) diesel engine. This study proposes a new air preheating system. The experimental results show that at an elevated inlet air temperature after warming up the engine, oxides of nitrogen (NOx), carbon monoxide (CO) and engine noise decrease for medium load condition using the newly designed system. Comparatively better overall engine performance is found for medium load condition with the new set up. The reduction in emissions with dthe new set up may be due to significant ceduction in ignition delay and better combustion because of higher inlet air temperature.
• DESIGN AND IMPLEMENTATION OF IPMSM DRIVES USING ARTIFICIAL INTELLIGENCE
  M. J. Hossain, K.K. Islam, M.A. Hoque, M.A. Rahman
  Abstract PDF
  DESIGN AND IMPLEMENTATION OF IPMSM DRIVES USING ARTIFICIAL INTELLIGENCE
  M. J. Hossain, K.K. Islam, M.A. Hoque, M.A. Rahman

  Abstract

  This paper presents novel approaches of speed control scheme for interior permanent magnet synchronous motors (IPMSM) using artificial intelligence. Two types of control techniques based on fuzzy logic and neural networks are presented as examples of intelligent electrical drives. The complete vector control scheme of the (IPMSM) drive incorporation the artificial intelligent controllersi. e. fuzzy logic controller (FLC) and artificial neural network (ANN) are simulated and experimentally implemented for an 1-hp IPMSM using a digital signal processor board DS-1102 in the laboratory. Performance of the proposed FLC-and ANN based IPMSM drive is investigated and compared for various dynamic operating conditions, such as, sudden change in command speed, step change in load, etc. The comparative results show that both the controllers provide optimum performances but the FLC is found to be superior over the ANN in terms of lower settling time and computational burden for the high-performance industrial drive applications.
• A FLEXIBLE AND INTERACTIVE INTELLIGENT AGENT ORIENTED E-LEARNING MODEL OF APPLICATION SOFTWARE FOR GENERAL USERS OF COMPUTER
  Al-Mukaddim Khan Pathan, Shaikh Mostafa Al Masum, Md. Zahed Ali, Md. Razib Hayat Khan, S.M MazharulHoque
  Abstract PDF
  A FLEXIBLE AND INTERACTIVE INTELLIGENT AGENT ORIENTED E-LEARNING MODEL OF APPLICATION SOFTWARE FOR GENERAL USERS OF COMPUTER
  Al-Mukaddim Khan Pathan, Shaikh Mostafa Al Masum, Md. Zahed Ali, Md. Razib Hayat Khan, S.M MazharulHoque

  Abstract

  Web based learning; in other words, e-learning is getting popular now-a-days. This paper presents a flexible and interactive intelligent agent oriented e- learning model of Application Software for easy learning of mass people. The main intention of this paper is to describe the model that would act as a prudent teacher to teach and test the aptitude of Applicadtion Software based on available knowledgebase. Here, we provided an overall view of the proposed model and then described in brief about the purposes of different components of the model. This paper provides a visualization model based on Web Online Force-Directed Animated Visualization (WebOFDAV) and also points out the implementation issues. The application software taken under consideration in this paper is the Office Automation package. The proposed model is designed to be compatible with other application software as well. An agent based software system under this model is in development phase with necessary linguistic support.
• ENERGY ABSORPTION BEHAVIOUR OF SHORT FIBRE COMPOSITE
  A.K.M Masud, A.K.M. Kais Bin Zaman
  Abstract PDF
  ENERGY ABSORPTION BEHAVIOUR OF SHORT FIBRE COMPOSITE
  A.K.M Masud, A.K.M. Kais Bin Zaman

  Abstract

  Plastic composite material is one of the most suitable design materials in airctaft industries, due to its high specific strength. As unidirectional composites exhibit anisotropy, much effort has been drawn by the researchers to make isotropic plastic composite materials. One of their efforts is to make randomly oriented short fibre composites. Unfortunately, theoretical interpretation is highly case dependent. Energy absorption is an important property for structural design element especially for aircraft industries. Thus in this research a generalized model is developed to calculate enetgy absorption by the randomly oriented short fibre composite. Here, classical single-fibre pull-out process is considered for calculating the energy of the randomly oriented short fibre composite. Concept of single-fibre pull-out test is incorporated to the model, such that the fibres intersecting a fracture plane (Where the fracture of compositeoccurs) would pull out or fracture like single-fibre pull -out test. The energy contrubution of each fibre in the fracture plane is calculated for different embedded length and orientation to estimate the total fracture energy. According to lthe model, it is found that the energy absorption depends upon the intrinsic properties of the fibre and matrix, volume fraction, critical embedded length of the fibre( the critical embedded length is defined as the length at which the load required to pull out lthefibre becomes almost equal to the fracturing load of the fibre, during the single-fibre pull-out test.), length of the short fibre and orientation of the fibres in matrix. The significance of the explicit formula for the energy absorption is that it can be used to estimate the amount of fibres and fibre length required to absorb certain amount of energy for composite to be used in structural design element before the material is made.