Batman University

About: Batman University is a education organization based out in Batman, Turkey. It is known for research contribution in the topics: Diesel fuel & Diesel engine. The organization has 300 authors who have published 810 publications receiving 10346 citations. The organization is also known as: Batman Üniversitesi.

PID Speed Control of DC Motor Using Harris Hawks Optimization Algorithm

Abstract: This paper demonstrates the application of Harris hawks optimization (HHO) algorithm to tune a PID controller for speed regulation of a DC motor. The proposed technique was used to obtain optimal parameters of PID controller by minimizing the integral of time multiplied absolute error (ITAE) as the objective function. The speed step response characteristics of the proposed HHO/PID and other state-of-the-art controllers tuned by atom search optimization (ASO), grey wolf optimization (GWO) and sine-cosine algorithm (SCA) were compared using transient response and robustness analyses. The simulation results have shown that the proposed HHO/PID controller is more effective and robust than ASO/PID, GWO/PID and SCA/PID controllers for the speed control of a DC motor even under uncertainties.

On the energy distribution profile of interface states obtained by taking into account of series resistance in Al/TiO2/p–Si (MIS) structures

Abstract: The energy distribution profile of the interface states (Nss) of Al/TiO2/p–Si (MIS) structures prepared using the sol–gel method was obtained from the forward bias current–voltage (I–V) characteristics by taking into account both the bias dependence of the effective barrier height (ϕe) and series resistance (Rs) at room temperature. The main electrical parameters of the MIS structure such as ideality factor (n), zero-bias barrier height (ϕb0) and average series resistance values were found to be 1.69, 0.519 eV and 659 Ω, respectively. This high value of n was attributed to the presence of an interfacial insulator layer at the Al/p–Si interface and the density of interface states (Nss) localized at the Si/TiO2 interface. The values of Nss localized at the Si/TiO2 interface were found with and without the Rs at 0.25-Ev in the range between 8.4×1013 and 4.9×1013 eV−1 cm−2. In addition, the frequency dependence of capacitance–voltage (C–V) and conductance–voltage (G/ω–V) characteristics of the structures have been investigated by taking into account the effect of Nss and Rs at room temperature. It can be found out that the measured C and G/ω are strongly dependent on bias voltage and frequency.

Investigate the Effect of Pre-drilling in Friction Drilling of A7075-T651

Abstract: Friction drilling is a non-traditional hole achieving method that is a clean, chip-less process, which is called thermal drilling, form drilling, flow drilling, and friction stir drilling. In this study pre-drilling friction drilling was investigated for improving the bushing shape of A7075-T651, which is a brittle cast material. During the process, surface roughness and bushing shapes were analyzed and generated frictional heat was measured by the virtue of thermocouples. Experiments were carried out to 4 mm and 6 mm in thicknesses of A7075-T651 aluminum alloy at 1200, 1800, 2400, 3000, and 3600 rpm spindle speeds, 20, 40, 60, 80, and 100 mm/min feed rates with using high-speed steel rotating conical tool, whose diameter is 8 mm. Consequently, the bushing shapes were advanced without cracks and petal formation in pre-drilling Friction drilling in comparison with without pre-drilling process. With increasing pre-drilled hole diameter the generated frictional heat was decreased. The achieved temperature wa...