|Title: First Law Analysis of a DI Diesel Engine Running on Straight Vegetable oil|
|Author(s): Md. Moinul Islam, Mohammad Anisur Rahman, Mohammad Zoynal Abedin|
|Pages: 1-5||Paper ID: 111203-5656 IJMME-IJENS||Published: June, 2011|
Abstract: An experimental investigation has been carried out for the first law analysis of a DI (direct-ignition) diesel engine running on straight soybean oil (SVO) preheated at 50, 75, 100oC with different loads at varying speeds of 1750, 2000, 2250 rpm. The results show that preheated straight soybean oil may be a practical replacement of the conventional diesel fuel with a small power and efficiency drop. The brake thermal efficiency of the engine apparently increases with increased preheats temperature of the soybean oil fuel and at 100oC it becomes very much comparable with the performance trends obtained using diesel fuel.
|Keywords: Straight vegetable oil, DI diesel engine, Energy crisis, Emission problem, First law of thermodynamics.|
|Full Text (.pdf) | 280 KB|
|Title: Sensitivity Analysis of Six-Sigma Applied to a Reliability Project|
|Author(s): Salman T. Al-Mishari, S. M. A. Suliman|
|Pages: 6-12||Paper ID: 113903-02-7575 IJMME-IJENS||Published: June, 2011|
Abstract: The Six-Sigma DMAIC process was applied to improve the reliability on a group of water disposal pumps at a number of oil facilities. The anticipated cost avoidance in terms of production losses and maintenance costs was simulated to be about half the current costs. After the completion of the project, a number of what-if scenarios were conducted to assess the importance of each step in the DMAIC process. Examples of such scenarios are “what if the problem was not well Defined, Measured, Analyzed, Improved, or Controlled?” This paper presents the results of the simulated scenarios in terms of monetary figures. The purpose is to illustrate the significance of each step in the DMAIC process.
|Keywords: Risk centered maintenance, Six-Sigma, Sensitivity analysis, Machinery reliability.|
|Full Text (.pdf) | 353 KB|
|Title: Multi-Source Detection and Location in Wheel-Rail Noise|
|Author(s): Gao Ruipeng, Shang Chunyang, Wang Hongqiang|
|Pages: 13-17||Paper ID: 114003-6565 IJMME-IJENS||Published: June, 2011|
Abstract: In response to the Wheel-rail noise for the audio processing made use of the microphone array setup delay coordinates and coordinates equations solved by Newton iteration method. Under this method for analyzing the accuracy of the optimal lower bound of time delay estimation, and the actual wheel and rail noise model needs to compare the experimental results show that the method proposed to meet the wheel-rail noise, the practical application of the system requirements.
|Keywords: Wheel-Rail noise; Data acquisition; Microphone array; Time Delay Estimation ;Sound source localization.|
|Full Text (.pdf) | 589 KB|
|Title: Computational Analysis of Active Flow Control to Reduce Aerodynamics Drag on a Van Model|
|Author(s): Harinaldi, Budiarso, Rustan Tarakka, Sabar P. Simanungkalit|
|Pages: 18-24||Paper ID: 118403-7272 IJMME-IJENS||Published: June, 2011|
Abstract: Method of active flow control can be applied to reduce aerodynamic drag of the vehicle. It provides the possibility to modify locally the flow, to remove or delay the separation position or to reduce the development of the recirculation zone at the back as well as the separated swirling structures around the vehicle. In this study, a passenger van is modeled with a modified form of Ahmed's body by changing the orientation of the flow from its original form (modified/reversed Ahmed Body). This model is equipped with suction and blowing on the rear side to comprehensively examine the pressure field modifications that occur in order to modify the near wall flow toward reducing the aerodynamics drag. The computational simulation used is k-epsilon flow turbulence model. In this configuration, the front part of body was inclined at an angle of 35? with respect to the horizontal. The geometry is placed in a 3D-rectangular numerical domain with length, width and height equal to 8l, 2l and 2l, respectively. The suction and blowing velocities are set to 1 m/s, 5 m/s, 10 m/s and 15 m/s, respectively. The results show that aerodynamic drag reductions close to 15.83 % for suction and 14.38 % for blowing have been obtained.
|Keywords: Drag reduction, active flow control, suction, blowing, reversed Ahmed body.|
|Full Text (.pdf) | 868 KB|
|Title: Rights & Obligations of Contracting Parties in Engineering Contracts in Bangladesh|
|Author(s): Mohammad Anisur Rahman, Md. Moinul Islam, Mohammad Zoynal Abedin|
|Pages: 25-27||Paper ID: 111303-0404 IJMME-IJENS||Published: June, 2011|
Abstract: This paper introduces the basics of contracts related to engineering works and services. It also describes the process of contracting works to give an idea how the contract issues are framed out in the process. In addition, it describes the relationship and interfaces of engineering and law, definition and meaning of contract, types of contracts, and prerequisites to the formation of a valid contract, interpretation of contract and performance or breach of contract. Moreover, it analyzes the elements of contract in the light of the guidelines, rules and regulations to formulate sound contracts. It also frames out the model conditions of contract, in which it distinguishes between two types of contract i.e. “General Conditions of Contract” and “Conditions of Particular Application” and describes all issues that are related to the first one. The core objective of this paper is to analyze some special contracting issues, which are vital for both the contractor and the employer. Furthermore, it finds out the rights and obligations of contractor and employer on those contracting issues.
|Keywords: GoB, Issue, Cross-reference, Model Condition, Contractor, Employer, Financier, FIDIC.|
|Full Text (.pdf) | 868 KB|