The thermal analysis of radiant heating by the final elements method to choose suitable control for central heating systems in host buildings

This research performs thermal analysis of the central heating's radiator by the final elements method manner using Cosmos/m2.6, Where it was designing a three dimensional model of the radiator with engineering specifications that mimic one of the used radiators .Then apply a convection simulates the role of the mediator heating used and ambient temperature for concluding the mathematical behavior of thermal gradient within the radiator. Research proposing a control system depends on adjusting the intermediary of heating inside the radiator, through the installation of flow control valve which works by D.C motors at the entrance to each radiant. The research shows the inability of depending on controlling system which uses the PI controller in building a suitable control system, Because the difficulty of receiving signals from analog temperature sensor that reflect the constant readings of room temperature which makes the response of control valve for signals slow, Thus makes the use of PI unhelpful of the economic and technical side.

Computer modeling of reducers gearboxes for large axes vehicles and analysis with the help of finite element

The use of modern methodologies and techniques a new approach to evaluate the process of engineering design in the industry pay to use in evaluating the speed in large cans mechanisms design. The gearbox that is designed for big vehicles for off-road driving conditions need portal axle which installed between the wheel and the axle shaft to give higher ground clearance to the vehicle. The modeling and simulation of spur gear which contacted with portal axle is important to predict the actual motion behavior, but it's so complicated to study. In this study, it'll analysis the portal axle by using finite element method (FEM), modal analysis will simulated on three different combinations of gear train system, the three gear trains being analyzed are: gear train without idler gear, one idler gear and two idler gears. FEM static stress analysis will also simulated on three different gear train to study the gear teeth bending stress and contact stress behavior of the gear trains in different angular positions from °0 to °18 degree.

Examining the Effectiveness of the Hot Spot Stress Method to Assess Fatigue Stresses inWelded Joints Using Finite ElementsAnalysis

Tensile and bending tests modeling have been undertaken for various welded joints which were different in shape and design. Also, the hot spot stress was calculated at critical failure areas using the finite elements analysis method. There was a good similarity between experimentally defined critical areas in certain certified literature and those in our modeling. It appeared that the information listed in the international institute for welding (IIW) in regards of hot spot stress method gives relatively accurate values for the welded joints possibility to endure fatigue loading and keep their desired mechanical properties even those joints that could fail only at the connecting area with the base metal.