by Yongbo Lai, Dewen Kong and Zhiwei Wang
Original Research
Applies programmable logic controller (PLC) to configure control hardware system, addresses the temperature control for a high speed nitrogen gas wind tunnel (HSNWT) testing, in order to obtain variable high temperature control with variable high speed gas flow, a coordinating factor of the gas flow is proposed between the tunnel’s heating and water cooling systems, moreover, considering the temperature modeling nonlinearities, uncertainties and disturbances, establish robust cascade fuzzy PID and expert predictive control strategies for the inner-loop water cooling subsystem and the outer-loop heating system, respectively, which effectively overcomes the influences of large inertia and transport time delay on the temperature responses. Furthermore, designs human-machine integrated user control interface (HMI), achieves fast and accurately control for user operating. The designed system are simulated and tested in the application, which results demonstrate that the system runs stable and reliable, has strongly robustness when the temperature changes with different loading heat modes, and has excellent capability of variable high speed nitrogen gas flow.
American Journal of Electrical and Electronic Engineering. 2018, 6(3), 93-99. DOI: 10.12691/ajeee-6-3-4
Pub. Date: December 12, 2018
16076 Views2619 Downloads
by Ahmed Siddig Ibrahim Mustafa, Mohammed Almoiz Abd-Almoniem Mohammed and Nassrin Ibrahim Mohamed Elamin
Original Research
An electronically controlled parasitic antenna array consisting of one active element connected to a software defined radio (SDR) receiver and four passive parasitic elements used to design and construct affordable radio direction finding system. The directivity of the antenna array achieved by increasing/degreasing the electrical length of the parasitic elements. The design based on a central active monopole and an array of four parasitic monopoles equidistantly from the central element by 0.20 λ, placed on ground plane to provide the 360 degree azimuthal coverage without any moving parts, provides excellent directional resolution. The system is controlled by using Arduino to switch between regions (0-90),(90-180),(180-270) or (270-360) and analysed by using a newly developed method based on I/Q samples to extract the amplitude and phase of the desired signal to find the exact direction in that region. The antenna design, its application to determine the direction finding, the new algorithm are presented below.
American Journal of Electrical and Electronic Engineering. 2018, 6(3), 90-92. DOI: 10.12691/ajeee-6-3-3
Pub. Date: November 13, 2018
11467 Views2345 Downloads1 Likes
by Alok Kumar Singh, Pragati Kumar and Raj Senani
Letter To Editor
In this communication, a Current Follower Current Conveyor (CFCC)-based quadrature oscillator circuit has been proposed which employs a resonator-negative resistor configuration and provides oscillations in quadrature from two high impedance current output terminals of the CFCCs. The workability of the quadrature oscillator has been verified using PSPICE simulations using a CMOS CFCC implementable in 0.18 micron TSMC technology.
American Journal of Electrical and Electronic Engineering. 2018, 6(3), 85-89. DOI: 10.12691/ajeee-6-3-2
Pub. Date: November 02, 2018
10465 Views2137 Downloads
by D. K. Sambariya and Tarun Gupta
Original Research
Representation of physical system using mathematical models leads the process to high-order equations, which are difficult to use for analysis and synthesis. Therefore, it is necessary and useful to find the reduced order equations that describe the same characteristics as the original high-order system. This paper proposes a nature inspired flower pollination algorithm (FPA) for order reduction of original high-order linear time invariant systems. Reduced model will definitely be stable if the original model is stable. Four numerical examples of single-input and single-output systems of different orders are considered to verifying proposed method. The results are compared with different methods available in literature based on step response and performance indices.
American Journal of Electrical and Electronic Engineering. 2018, 6(3), 77-84. DOI: 10.12691/ajeee-6-3-1
Pub. Date: July 26, 2018
19878 Views3000 Downloads