Bilad Alrafidain Journal for Engineering Science and Technology (BAJEST)

In this paper, the frequency analysis methods can detect the fire accident of the solar arc we propose Discrete Wavelet Transform (DWT). The DWT can express time-axis information even in the frequency domain. In case of DWT algorithm, it was implemented based on Arduino linked with MATLAM. The DC arc accident has been implemented using standard using Rogowski coil. This coil is used to simulate the current sensor for large-capacity PV system application. The constructing and simulated DC series arc generation circuit was verified under actual arc generation conditions. In addition, the performance of the accident detector manufactured was studied The experiment results and its simulation demonstrate, the proposed method is more efficient than others.

In this research, EES software was used to simulate efficient model of solar collector for appropriate employing. The model of solar collector is treated with various absorber plate manufactured from Cu, Al- alloy or plain carbon steel and subjected into various ambient temperature. In addition, into efficiency of solar collector, the stagnate temperature of glass cover and absorber plate was calculated. Collector efficiency obviously appears convergence between simulations and experimental during solar collector has absorber plate from Cu or plain carbon steel. The efficiency of these two cases intersects with experiment at (∆T/GT = 0.825). The highest temperature is 167.5 °C was developed on the carbon steel absorber plate during exposure into 37 °C , while 134.9 °C is minimum values that was developed on Al- absorber plate during subjected in to 17 °C.

The temperature control of medical and biological ovens required a high precision controller. A Fuzzy-PD (Fuzzy-Proportional Derivative) controller is designed in this research for controlling the temperature of the heating system. The controlled heating system is a small laboratory oven used for biological experiments. The controller is designed using MATLAB version 7.14 program. SIMULINK environment of MATLAB program is used in designing the controller. The output response of the complete heating system for unit step input is obtained. The inputs and output membership function (MF) and also the surface viewer for the Fuzzy-PD controller are presented in this research. The simulation results show the good performance of the designed controller and its suitability and adaptability for such sensitive application.

Seawater has been used to immerse metals in several industrial applications. Axial loading is applied to these alloys. These alloys are prone to corrosion failures due to differences in environmental conditions. This research looked at the influence of submerged corrosion on the buckling behaviour of 304 stainless steel long column type and intermediate alloy under increasing compressive dynamic stresses. Compressive buckling experiments were performed on twenty-four 304 stainless steel alloy columns, twelve of which were non-corroded, and the tests were performed under increasing axial dynamical compression loads. Before testing, the remaining columns were submerged for 90 days. For the subterranean columns, a maximum decrease of percent in critical buckling loading was obtained. This work uses the Rankine, and Perry-Robertson formulas to calculate the critical buckling stress of non-corroded and corroded 304 stainless steel alloys. The theoretical conclusions of the critical buckling stress were in good accord with experimental data

low Cycle Fatigue behavior of aluminum alloy AA6063 heat treated at 350 ° c with different holding times was studied . Constant S – N Curve is designed with the main fatigue parameters . The results are verified with that obtained numerically . Using different holding times with low cycle fatigue properties AA6063 have been observed . Holding times of 2 , 4 , 6 and 8 hours at 350 ° C temperature was used . The yield stress and the ultimate tensile strength were decreased with the increasing the holding time . The strength Coefficient K and the strain hardening index n results were increased as the holding time temperature increased . Also the exponent b of fatigue strength and the exponent C of fatigue ductility were increased as the holding time increased . Cyclic elastic Strain do not change much with increasing the time at Same temperature 350 ° C and the situation is also the Same for fatigue strain coefficient , for the cyclic plastic strain - Optic Micrograph images were taken using variable magnification before and after fatigue test . Moreover the failure mechanisms with microstructural features are studied using scanning electron microcopy (SEM)