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   2013| July-December  | Volume 3 | Issue 2  
    Online since June 5, 2013

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Adaptive nodeless variable finite element method for convectively-cooled solid
Sutthikom Puntimakornkij, Atipong Malatip, Pramote Dechaumphai
July-December 2013, 3(2):65-70
An adaptive nodeless variable finite element method for analysis of convectively-cooled solid is presented. The method solves two-dimensional heat transfer in solid coupling with one-dimensional heat transfer of fluid flow in channel. The nodeless variable finite element concept is introduced to increase the solution accuracy without adding the actual nodes. An adaptive finite element technique is incorporated to further improve the overall analysis solution accuracy. Several examples are presented to evaluate the performance of the proposed method by comparing the predicted solution with the exact solution and/or the solution from solving the full Navier-Stokes equations.
[ABSTRACT]   Full text not available  [PDF]
  1,054 4,449 -
Design of co-axial fed broadband single layer rectangular microstrip patch antenna for wireless applications
Jaswinder Kaur, Rajesh Khanna, Machavaram Kartikeyan
July-December 2013, 3(2):71-75
In present work, a novel co-axial fed single layer E-shaped rectangular micro strip patch antenna with broadband behavior for wireless local area network (WLAN) and world-wide interoperability for microwave access (Wi-MAX) applications is proposed. The micro strip antenna has a planar geometry that consists of a ground, a substrate, a patch, and a feed. The basic theory about the proposed structural design, impedance matching, and the radiation characteristics are studied and analyzed using method of finite difference time domain technique. Simulation was conducted using computer simulation technology microwave studio software for optimization of antenna's properties. The proposed antenna has a frequency bandwidth of about 712 MHz (5.16-5.88 GHz) at −10 dB return loss which is sufficient to make the antenna useful for 5.2/5.8 GHz WLAN and 5.5 GHz Wi-MAX application. The WLAN standard requires the antenna to cover 5.15-5.35 GHz and 5.725-5.825 GHz frequency bands and Wi-MAX requires the antenna to cover 5.25-5.85 GHz frequency band. Maximum achievable gain over the entire frequency band is 5.5 dBi. To meet the demanding bandwidth specification, a substrate of low dielectric constant is selected to obtain a compact radiating structure. Furthermore, reflection coefficient is below −10 dB over the entire frequency band at the input of the optimized E-shaped micro strip patch antenna with 50-Ω system impedance.
[ABSTRACT]   Full text not available  [PDF] [CITATIONS]
  1,742 1,975 1
Control chart patterns recognition using optimized adaptive neuro-fuzzy inference system and wavelet analysis
Amir Bahador Bayat, Abdolreza Gharekhani, Masoud Azam Mohajeran, Jalil Addeh
July-December 2013, 3(2):76-81
Unnatural patterns in the control charts can be associated with a specific set of assignable causes for process variation. Hence, pattern recognition is very useful in identifying process problem. In this study, we have developed an expert system that we called an expert system for control chart patterns recognition for recognition of the common types of control chart patterns (CCPs). The proposed system includes three main modules: The feature extraction module, the classifier module and the optimization module. In the feature extraction module, the multi-resolution wavelets (MRW) are proposed as the effective features for representation of CCPs. In the classifier module, the adaptive neuro-fuzzy inference system (ANFIS) is investigated. In ANFIS training, the vector of radius has a very important role for its recognition accuracy. Therefore, in the optimization module, cuckoo optimization algorithm is proposed for finding optimum vector of radius. Simulation results show that the proposed system has high recognition accuracy.
[ABSTRACT]   Full text not available  [PDF] [CITATIONS]
  1,364 1,184 3
Smart material (sma)-based actively tuned dynamic vibration absorber for vibration control in real time applications
Yuvaraja Mani, Senthilkumar Mouleeswaran
July-December 2013, 3(2):90-96
Dynamic Vibration Absorber (DVA) can be used as an effective vibration control device. A (DVA) is essentially a secondary mass, attached to an original system via spring and damper. The natural frequency of the DVA is tuned such that it coincides with the frequency of unwanted vibration in the original system. This result in absorbing the inertial energy transferred from the primary structure. This current study aims at developing an actively tuned dynamic vibration absorber with the help of shape memory alloy (SMA) springs in order to attenuate the vibration for a range of excitation frequencies. In this study, the unique property of SMAs temperature-dependent Young's modulus has been used to change the stiffness of the spring actively to control the vibration. Experiments were carried out with SMA-based dynamic vibration absorber to study the effect of reduction in amplitude of vibration of a cantilever structure. A micro controller-based proportionate control system has been developed for timely actuation of SMA and to supply optimum current to the SMA springs, which are connected in parallel. The experimental results show that the SMA-based dynamic vibration absorber is more effective in reducing the amplitude of vibration for a wider frequency range. The effectiveness of the developed SMA-based DVA was checked in real time-piping application, and the results demonstrate that the SMA springs has good potential to be used as vibration control device.
[ABSTRACT]   Full text not available  [PDF] [CITATIONS]
  1,171 501 1
Application of superconducting magnet energy storage to a multi-area automatic generation control scheme suitable in a restructured power system
Sandeep Bhongade, Barjeev Tyagi
July-December 2013, 3(2):82-89
The application of superconducting magnetic energy storage (SMES) unit to the stabilization of genetic algorithm (GA) based multi-area automatic generation control scheme is presented. In this paper, SMES units have been used to the power systems to inject or absorb active power. Developed scheme utilizes a proportional, integral and derivative (PID) controller to control the output of the generators. The parameters of PID controller have been tuned according to GA based performance indices. The developed G A based PID (GAPID) controller has been tested on a practical Indian power system network representing 75- bus system. A deregulated electricity market scenario has been assumed in the 75- bus system, which has been divided into four control areas. Mixed transaction (Poolco and bilateral) has been considered in the frequency regulation. The effect of generator rate constraint (GRC) has also been included in developing the multi area AGC model.
[ABSTRACT]   Full text not available  [PDF]
  1,172 434 -
An experimental investigation on the flexural behavior of geopolymer ferrocement slabs
Mohana Rajendran, Nagan Soundarapandian
July-December 2013, 3(2):97-104
Efforts are needed to develop innovative and environmentally friendly material in order to reduce the greenhouse gas emissions. An experimental investigation on the flexural behavior of thin cement-less composite plates reinforced with welded rectangular wire mesh and chicken mesh with varying number of mesh layers as well as varying concentration of alkaline solution is presented. A total of 30 slabs have been tested under flexural loading. The size of the slab is 1000 mm (length) × 200 mm (width) × 25 mm (thickness) and 1000 mm (length) × 200 mm (width) × 30 mm (thickness). The parameters studied in this investigation include varying the concentration of sodium hydroxide 8 M, 10 M, 12 M, 14 M and thickness of composite panels. In this work, cement is replaced by geopolymer mix to bind the ferrocement skeletal and its' flexural behavior are studied. It is concluded that the first crack and ultimate loads increase with the increase in the thickness of the element and the concentration of alkaline solution. From the studies, it is observed that the load carrying capacities, energy absorption, deformation at ultimate load are high in the case of geopolymer ferrocement element. Further, it is observed that there is a reduction in crack width and increase in number of cracks in the case of geopolymer ferrocement indicates delay in crack growth.
[ABSTRACT]   Full text not available  [PDF] [CITATIONS]
  1,194 304 1
Effect of machining parameters on dimensional deviation in wire electric discharge machining process using pure titanium
Anish Kumar, Vinod Kumar, Jatinder Kumar
July-December 2013, 3(2):105-112
This study presents an investigation on wire electric discharge machining (WEDM) of pure titanium (grade-2). An attempt has been made to model the response variable dimensional deviation using the response surface methodology in a WEDM process. The experimental plan is based on Box-Behnken design. Six parameters such as pulse on time, pulse off time, peak current, spark gap voltage, wire feed, and wire tension were varied to investigate the effect on output response. The response has been optimized using the multi-objective optimization through desirability approach. The analysis of variance has been applied to identify the significance of the developed model. The test results confirm the validity and adequacy of the developed response surface methodology model. Finally, the optimum parametric setting is designed for the optimization of process .
[ABSTRACT]   Full text not available  [PDF] [CITATIONS]
  1,173 284 1
Performance analysis of mobile wimax handoff using qualnet simulator
Thulasimani Lakshmanan
July-December 2013, 3(2):113-117
Mobile WiMAX is a wireless technology based on IEEE802.16e for broadband wireless access. Mobile WiMAX introduces the most significant new feature, mobility to support for handovers, which can be considered as a basic requirement for mobile communication system. The mandatory handoff method is hard handoff for mobile WiMAX and other two optional soft handoff methods are macro diversity handoff and fast base station switching handoff method. Hand over delay generates during data transmission but handover delay should be less than 50ms over real time applications such as Voice Over Internet Protocol (VOIP). The existing draft standard considers only the received signal strength when deciding handover. The mobility improvement handover scheme that depends upon the velocity factor has been taken into consideration in this paper. The proposed scenario has been implemented using QualNet network simulator which has led to less handover time.
[ABSTRACT]   Full text not available  [PDF] [CITATIONS]
  1,112 325 1
Seismic performance study on exterior beam-column joint with mechanical anchorage for different joint core details
Rajagopal Saminathan, Prabavathy Shamugasundaram
July-December 2013, 3(2):118-123
In the present study, in reinforced concrete structures, beam-column connections are one of the most critical regions in higher seismic prone areas. Proper reinforcement anchorage is essential to enhance the performance of the joints. Congestion of reinforcement and construction difficulties are reported frequently while using the conventional reinforcement detailing in the joint core area. An attempt has been made to study and evaluate the performance of joints with anchorage detailing as per American Concrete Institute (ACI)-352, ACI-318, and Indian Standard (IS)-456 along with confinement as per IS-13920 and without confinement. Apart from a solution for these problems, significant improvements in seismic performance, ductility, and strength were observed while using the mechanical anchorage (headed bar) in combination with X-cross plus hair clip (U-bar) joint reinforcement for higher seismic prone areas. To evaluate the performances of these types of anchorages and joint details, the specimens were assembled into two groups, each group having three specimens were tested under reversal loading and the same are presented in this paper.
[ABSTRACT]   Full text not available  [PDF]
  1,077 250 -
An integrated production planning and scheduling framework for make-to-order environment
Viraj Tyagi, Ajai Jain, PK Jain
July-December 2013, 3(2):124-129
A capacity constrained integrated production planning and scheduling framework for a manufacturing firm operating in make-to-order environment, has been formalized. It primarily aims at the generation of shop floor schedules that are feasible with production plans generated at a higher level, practical and efficient at the shop floor. The formalized framework integrates capacity planning, loading and scheduling activities of a job-shop with consideration of process plans flexibility. The performance of framework is assessed through two case studies. Experimental investigation reveals that shop utilization level considered at capacity planning level affects master production schedule and system performance. Further, presence of multiple process plans improves system performance; especially, they assist in reducing the number of tardy part-types. Moreover, shortest processing time dispatching rule performs better than earliest due date during scheduling.
[ABSTRACT]   Full text not available  [PDF]
  968 283 -