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Bajwa O.I.,Advanced Engineering Research Organization | Munir A.,Advanced Engineering Research Organization
IFASD 2013 - International Forum on Aeroelasticity and Structural Dynamics | Year: 2013

The chord-wise position vis-à-vis the span-wise position of the wing-stores (fuel tanks, engines, etc.), on both commercial and military aircrafts, significantly influence the aeroelastic behavior of the aircraft wings. A particular position may destabilize the wing at a particular operating flight condition, which can prove catastrophic for the safety of the crew. The first part of this research investigates the flutter response of a generic aircraft wing with respect to chord-wise position of the wing-store located at a particular span-wise station. A MATLAB code is established that determines the flutter speed for different chord-wise configurations of the wing-store by repeatedly solving the eigenvalue problem at various altitudes. The flutter equations of motion are modified to incorporate the store mass and store induced aerodynamics in terms of lift curve slope which in turn, is determined by using planar vortex lattice method. The second part of this research aims to develop a multidisciplinary framework that optimizes the wing-store position during preliminary design phase. The optimization code is formulated in MATLAB that employs analytical Global Sensitivity Equations (GSE) approach and as well as the numerical finite differencing technique to establish the search direction during optimization. Initially the store chord-wise position at a particular span-wise station is optimized for maximum damping ratio and afterwards, the optimization is carried out to achieve minimum mass moment of inertia of the wing section carrying store by varying the store chord-wise position, subjected to prescribed performance constraint of aerodynamic damping. The optimized solutions from both the analytically based GSE and the finite difference based optimizers are presented and compared with the wing-store flutter analysis performed earlier. Finally, it is concluded that the GSE methodology gives computationally cost effective and robust solution during the preliminary aeroelastic design optimization problem.

Aamir M.,Sir Syed University of Engineering and Technology | Aamir M.,Mehran University of Engineering and Technology | Uqaili M.A.,Mehran University of Engineering and Technology | Khan N.A.,Advanced Engineering Research Organization | And 2 more authors.
Wireless Personal Communications | Year: 2015

This paper presents implementation and testing of a remote terminal unit (RTU) design which is suitable for wide area operation essential for controlling and monitoring oil and gas sector, water and power industries. This particular implementation is based on field programmable gate array which confers reliability and reconfigurability properties to the RTU design. It has significant advantages resulting in a more powerful and optimized solution for execution of wireless based Supervisory control and data acquisition system. The main objective of this research work is to implement and verify a design considering performance parameters which assists in optimized development and inexpensive implementation of an RTU, also featured with wireless communication. It also includes behavioral modeling using integrated software environment web pack of XILINX for the purpose of testing functionality of developed RTU. Features of developed RTU are also compared with commercially available hardware considering its cost effectiveness. This particular design and implementation is made up of four major sections including analog input, digital input, digital output and communication interface module. © 2015, Springer Science+Business Media New York.

Aamir M.,Sir Syed University of Engineering and Technology | Aamir M.,Mehran University of Engineering and Technology | Poncela J.,University of Malaga | Uqaili M.A.,Mehran University of Engineering and Technology | And 2 more authors.
Wireless Personal Communications | Year: 2013

For energy deficit countries, the design of Supervisory Control and Data Acquisition (SCADA) based energy management systems for optimal distribution is of high interest. Such design involves development of Remote Terminal Unit (RTU) which is considered as an essential component of any high scale SCADA system and it is functioning as remote field data interface. Considering various generations of SCADA, two different designs of an RTU are proposed for third generation (Networked Approach) SCADA in view of energy management applications. One design includes Programmable Logic Controller (PLC) as CPU of RTU and other would involve Field Programmable Gate Array (FPGA) instead of PLC. This paper results in comparative study of two different selections of CPUs for designing an RTU based on performance measurement. PLC based RTU exhibits limited features where as FPGA based RTU possesses unique features like encryption support, radio support and large memory area. Suitable simulation tools are needed in order to determine the best approach. The main objective of this study is to propose a design outline considering significant parameters that facilitates optimized development and low cost implementation of an RTU, also featured with wireless communication. In addition to the optimized design of an RTU by means of comparative study, a brief discussion on optimization of wireless link for Remote Terminal Unit is also presented. This phase involves detailed comparison among various options considering the RF spectrum for optimal solution. This segment of research results in design of optimized wireless link for the planned low cost Remote Terminal Unit (RTU). A scenario depicting multiple RTUs communicating with one Tele-Control Interface (TCI) is discussed to address optimized implementation of wireless SCADA. © 2013 Springer Science+Business Media New York.

Ramzan R.,Linköping University | Ramzan R.,National University of Computer and Emerging Sciences | Ahsan N.,Linköping University | Ahsan N.,Advanced Engineering Research Organization | Dabrowski J.,Linköping University
IEEE Transactions on Instrumentation and Measurement | Year: 2010

This paper presents the design and measurement of a stimulus generator suitable for on-chip RF test aimed at gain, 1-dB compression point (CP), and the blocking profile measurement. Implemented in a 90-nm complementary metaloxidesemiconductor (CMOS), the generator consists of two low-noise voltage-controlled ring oscillators (VCOs) and an adder. It can generate a single- or two-tone signal in a range of 0.95.6 GHz with a tone spacing of 3 MHz to 4.5 GHz and adjustable output power. The VCOs are based on symmetrically loaded double-differential delay line architecture. The measured phase noise is -80 dBc/Hz at an offset frequency of 1 MHz for the oscillation frequency of 2.4 GHz. A single VCO consumes 26 mW at 1 GHz while providing -10-dBm power into a 50-Ω load. The silicon area of the complete test circuit including coupling capacitors is only 0.03 mm2 while a single VCO occupies 0.012mm2 The measured gain, 1-dB CP, and blocking profile of the wideband receiver using the on-chip stimulus generator are within ±8%, ±10%, and ±18% of their actual values, respectively. These error values are acceptable for making a pass or fail decision during production testing. © 2010 IEEE.

Hashmi K.H.,Advanced Engineering Research Organization | Hashmi K.H.,University of Engineering & Technology, Taxila | Khalil S.,University of Engineering & Technology, Taxila | Zakria G.,Advanced Engineering Research Organization | And 3 more authors.
Life Science Journal | Year: 2013

The scope of high speed machining for hard materials has been increased due to explorations in the field of applications of these materials in today's technological world. The applications of these materials including Titanium alloys especially used for aerospace are rapidly increasing due to emergent needs of customers and shorter product life cycles. High speed machining (HSM) of Titanium alloys is a more complex phenomenon than that of conventional materials and machining processes. Process optimization for HSM of Titanium alloys can significantly reduce the cycle time of machining processes resulting in reduced lead times, better project management and increased profits. There are several parameters that need to be optimized for better and cost effective machining of Ti alloys. But before optimization the identification and prioritization of these parameters is obligatory. In this paper a methodology has been developed for identification and prioritization of these key parameters. Expert opinions are integrated with Analytical Hierarchical Process (AHP) to define the priority of these parameters. The prioritized matrices will then form the basis for further optimization of these key parameters to be used for HSM of Ti alloys.

Nino-Baron C.E.,Caterpillar Inc. | Tariq A.R.,Advanced Engineering Research Organization | Zhu G.,Michigan State University | Strangas E.G.,Michigan State University
IEEE Transactions on Vehicular Technology | Year: 2011

This paper presents a methodology of calculating the optimal torque and speed commands for the engine-generator system of a series hybrid electric vehicle (HEV). In series HEVs, the engine-generator subsystem provides electrical energy to the dc link. This paper proposes an optimal control strategy of the engine-generator subsystem to generate a desired amount of energy within a given period of time. The optimization algorithm, based on trajectory optimization, determines the torque and speed reference signals for the engine-generator subsystem that achieve maximum efficiency. A simplified version of the controller is also presented for online implementation. The proposed control strategy is compared with nonoptimized control techniques, and simulation results show the improvements in energy efficiency. © 2011 IEEE.

Tariq A.R.,Advanced Engineering Research Organization | Nino-Baron C.E.,Caterpillar Inc. | Strangas E.G.,Michigan State University
2011 IEEE International Electric Machines and Drives Conference, IEMDC 2011 | Year: 2011

Permanent magnet synchronous machines (PMSMs) are widely used as traction machines in the hybrid and electrical vehicles (HEVs) due to their high power density, wide field weakening range and high efficiency. An optimized and efficient design of PMSMs depends upon the driving cycle requirements and consideration of losses of every subsystem in the traction drive. Efficiency of a traction drive over a driving cycle is more important than the efficiency of the traction machine at one operating point. This paper presents an approach for the design of PMSMs based upon the average driving cycle efficiency (ADCE) of traction drive for an urban series hybrid bus for a specific driving cycle. It includes the efficiency of machine, inverter as well as the energy utilized by their cooling systems. The proposed approach was applied to two different machines to demonstrate its validity. © 2011 IEEE.

Samee A.,Advanced Engineering Research Organization | Zakria G.,Advanced Engineering Research Organization | Hashmi K.H.,Advanced Engineering Research Organization | Shahzad A.,Advanced Engineering Research Organization | And 2 more authors.
Research Journal of Applied Sciences, Engineering and Technology | Year: 2014

This study investigates the deformation produced in the weld-based prototype and to optimize the welding parameters to minimize this deformation. Weld-based prototyping is a method to produce form-fit and near-net-shape or net shape prototypes. However, the large amount of heat exposure for the substrate plate and for previously built layers is one of the limitations of weld based prototyping. This causes high temperature gradient which results in deformation, residual stresses, warpage and poor surface quality. In this study a part is made by using welding by incremental layer buildup method. This yielded anisotropic material properties in the part with the non-homogeneous structure and porosity. In present study above mentioned problems were minimized by proper selection and optimizing the deposition parameters such as inter-pass cooling time, heat sink size, deposition speed, applying mechanical constraints and preheating. For analysis of present weld based prototype, experimental approach is adopted. In such developments, the phenomenon of deformation is very crucial to control. In this study a focus has been made on investigation of deformation produced and the parameters effecting this deformation. © Maxwell Scientific Organization, 2014.

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