2024-03-28T21:06:54Z
https://www.ije.ir/?_action=export&rf=summon&issue=11413
International Journal of Engineering
IJE
1025-2495
1025-2495
2006
19
1
Sealing of Rotary Drums for Operation Under Pressurized Conditions
S.
Sadighi
M.R.
Yousefi
Mansour
Shirvani
Rotary Drum
Leakage
Controlled Sealing
Pressurized Operation
2006
11
01
1
12
https://www.ije.ir/article_71605_7f2e3192eab3ffacc5fe888313bc3234.pdf
International Journal of Engineering
IJE
1025-2495
1025-2495
2006
19
1
Modification of Sidelobe Canceller System In Planar Arrays (RESEARCH NOTE)
Reza
Mohammadkhani
N.
Komjani
A Side Lobe Canceller (SLC) structure is a conventional partially adaptive technique which is used in large adaptive array radars. If a desired signal has long time duration in comparison with the SLC adaptation time, signal components may be cancelled. So, this paper presents a modified SLC which eliminates desired signal cancellation problems and allows using an unconstrained adaptive algorithm. Simulation results demonstrate the performance of this modified structure for a planar array.
Side Lobe Canceller
Generalized Side lobe Canceller
Adaptive Array
Planar Array
2006
11
01
13
20
https://www.ije.ir/article_71608_baf8a221d395b9bc4cdef85c7f7d93b3.pdf
International Journal of Engineering
IJE
1025-2495
1025-2495
2006
19
1
A Current-Based Output Feedback Sliding Mode Control for Speed Sensorless Induction Machine Drive Using Adaptive Sliding Mode Flux Observer
G. R.
Arab Markadeh
J.
Soltani
This paper presents a new adaptive Sliding-Mode flux observer for speed sensorless and rotor flux control of three-phase induction motor (IM) drives. The motor drive is supplied by a three-level space vector modulation (SVM) inverter. Considering the three-phase IM Equations in a stator stationary two axis reference frame, using the partial feedback linearization control and Sliding-Mode (SM) control, the rotor speed and rotor flux controllers are derived first. These controllers are capable of making the drive system states follow the system nominal trajectories in spite of the motor parameter uncertainties and external load torque disturbance. Then, based on the Lyapunov theory, a SM observer is developed in order to estimate the rotor flux, rotor speed and rotor resistance simultaneously. In addition, in order to satisfy the persistent excitation (P.E) condition, a low frequency low amplitude ac signal is superimposed to the rotor flux reference command. Finally, the validity and effectiveness of proposed control approach is verified by computer simulation.
Induction Machine
Sliding mode control
Adaptive
output feedback
sliding mode observer
Speed Sensorless
2006
11
01
21
34
https://www.ije.ir/article_71609_fbd2668707bf7c17c91b05daf6dc6889.pdf
International Journal of Engineering
IJE
1025-2495
1025-2495
2006
19
1
Transmission Dynamics of Malaria in Human Host: a Neuro-Fuzzy Approach
Sudheer
Sharma
G. C.
Sharma
Madhu
Jain
Malarial Parasites
Infected Host
Biting Function
Neuro
Fuzzy
Host Preference
Switching
Behavior
Equilibrium
2006
11
01
35
48
https://www.ije.ir/article_71611_f28f689e9aea96e97a803cd2cf3acb74.pdf
International Journal of Engineering
IJE
1025-2495
1025-2495
2006
19
1
Diffusion Process for GGR Machining System with Spares, Balking and Reneging (RESEARCH NOTE)
K. P. S.
Baghel
G. C.
Sharma
Madhu
Jain
This paper deals with the G/G/R machining system consisting of M operating machines as well as S cold standbys. The concepts of balking and reneging are incorporated which make our model more versatile to deal with real time systems. The broken-down machines are sent to repair facilities consisting of R permanent repairmen. The failure times and repair times are generally identical and independent distributed random variables. The failed machines are repaired according to FIFO rules. By using a diffusion process, the steady-state probability density function for the queue size is obtained in terms of the first two moments of inter-arrival times and repair times of machines. Some expressions in explicit form that characterize the system performance are also mentioned.
G/G/R Queue
Machine Repair
Standby
Diffusion
Balking
Reneging
2006
11
01
49
54
https://www.ije.ir/article_71614_a864caa5bae1d953941f6b91b563b6be.pdf
International Journal of Engineering
IJE
1025-2495
1025-2495
2006
19
1
A Comprehensive Model for R and D Project Portfolio Selection with Zero-One Linear Goal-Programming (RESEARCH NOTE)
H.R.
Ghorbani
fariborz
jolai
Reza
Tavakkoli-Moghaddam
Masoud
Rabbani
Technology centered organizations must be able to identify promising new products or process improvements at an early stage so that the necessary resources can be allocated to those activities. It is essential to invest in targeted research and development (R and D) projects as opposed to a wide range of ideas so that resources can be focused on successful outcomes. The selection of the most appropriate projects is the aim of R and D project selection models. The project selection is complicated by many factors, such as vision and preferences of decision makers, allocating the right human resources, interrelationships between projects, and changes over time and success factors that are difficult to measure. In this article we formulate essential factors in R and D project portfolio selection by a mathematical model, which consider a multi- objective function for maximizing corporate benefit through quantitative and qualitative criteria as well as insight and preferences of decision makers and human resource allocation which does not exceed organizations constraints such as planning horizon, available resources and interrelationships between projects.
mathematical programming
project management
R and D Project Portfolio Selection
2006
11
01
55
66
https://www.ije.ir/article_71616_6aeded4d7ebf6c8f959f667a90c1288c.pdf
International Journal of Engineering
IJE
1025-2495
1025-2495
2006
19
1
An Efficient Algorithm to Inter and Intra-Cell Layout Problems in Cellular Manufacturing Systems with Stochastic Demands
S.M.
Mirgorbani
fariborz
jolai
B.
Javadi
Reza
Tavakkoli-Moghaddam
Machine/Cellular Layout
Intra/Inter
Cell Movement
CMS
Stochastic Demands
Simulated Annealing
2006
11
01
67
78
https://www.ije.ir/article_71618_f50189787357585b11c15e7a2870fa03.pdf
International Journal of Engineering
IJE
1025-2495
1025-2495
2006
19
1
A Mathematical Model of a Multi-Criteria Parallel Machine Scheduling Problem: a Genetic Algorithm (RESEARCH NOTE)
Moeed
Haghnevis
Yasaman
Khodadadeghan
fariborz
jolai
Reza
Tavakkoli-Moghaddam
.
multi
criteria parallel machine scheduling
Earliness and tardiness penalties
Machine costs
Genetic Algorithms
2006
11
01
79
86
https://www.ije.ir/article_71620_f8ad2027463db2b85f872cb10b386eb0.pdf
International Journal of Engineering
IJE
1025-2495
1025-2495
2006
19
1
Thermal Behavior of a New Type of Multi-Layered Porous Air Heater
S.A.
Gandjalikhan Nassab
Based on an effective energy conversion method between gas enthalpy and thermal radiation, a multi-layered type of porous air heater has been proposed. In the five layered structure which is analyzed in this work, there are five porous layers which are separated by four quartz glass windows. The main layer operates as a porous radiant burner that products a large amount of thermal radiative energy and in the other layers, the energy conversion process between gas enthalpy and thermal radiation takes place. In order to obtain the thermal characteristics of the heater, the coupled energy equations for the gas flows and porous layers are solved numerically by iterative method. The two–flux radiation model is used for computing the radiative fluxes from a solid matrix. Computational results show a very high efficiency for this type of porous air heater although it has a very simple structure.
Multi Layer
energy conversion
Air Heater
Porous media
2006
11
01
87
94
https://www.ije.ir/article_71622_9ad198eace0ed933c425ae1a3b728723.pdf
International Journal of Engineering
IJE
1025-2495
1025-2495
2006
19
1
Trajectory Tracking of a Mobile Robot Using Fuzzy Logic Tuned by Genetic Algorithm (TECHNICAL NOTE)
S. H.
Mahboobi
Aria
Alasty
In recent years, soft computing methods, like fuzzy logic and neural networks have been presented and developed for the purpose of mobile robot trajectory tracking. In this paper we will present a fuzzy approach to the problem of mobile robot path tracking for the CEDRA rescue robot with a complicated kinematical model. After designing the fuzzy tracking controller, the membership functions and rule weights will be optimized by genetic algorithm in order to obtain more acceptable results. Simulation results have demonstrated significant improvements in controller efficacy.
fuzzy control
Trajectory Tracking
Rescue Robot
Genetic Algorithm
2006
11
01
95
104
https://www.ije.ir/article_71623_f1bb1559bc2ad974211bea1355685630.pdf