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Showing 2 results for Rezai Sangtabi
Optimization Of Stacking Sequence For Composite Plates Subjected To Slamming Impact Load Using Genetic Algorithm Method
Mohamad Rezai Sangtabi, Mohamadreza Khedmati, Mahdi Fakori,
Volume 7, Issue 13 (Spring & Summer 2011 2011)
Abstract
Optimisation of stacking sequence for composite plates under slamming impact loads using genetic algorithm method is studied in this paper. For this purpose, slamming load is assumed to have a uniform distribution with a triangular-pulse type of intensity function. In order to perform optimisation based on the genetic algorithm method, a special code is written in MATLAB software environment. The prepared code is so coupled with the commercial software ANSYS that in each step of optimisation, it could analyse the composite plate under study and calculate the central deflection. After validation, different cases of stacking sequence optimisation are investigated for a variety of composite plates. The investigations include symmetric as well as anti-symmetric conditions of stacking sequence. Results obtained from these analyses reveal the fact that the adopted approach based on genetic algorithm is highly capable for performing such optimisations.
Experimental Analysis of slam-induced pressure on the bow-segment of surface ship
Mojtaba Shokri, Mohammad Reza Khedmati, Karim Akbari Vakilabadi, Mohammad Rezai Sangtabi,
Volume 17, Issue 33 (5-2021)
Abstract
Today, determination of slam-induced pressure is one of the interested issue of the researchers. Water entry of bow section of a ship is experimentally examined, in order to investigation of slamming pressure. This experimental study is distinguished because of the effect of longitudinal curvature in the ship shape body. A generalized Wagner theory is used to compare of experimental results. The predicted slamming pressure of experimental results is approximately 25 percent lower than Wagner theory because of differences in the assumption of theories. Longitudinal curvature of ships is ignored in the analytical method which is change of flow regime and produce of flow separation and air cavity. Thus, analytical method based on ignoring of longitudinal curvature cannot precinct predication of slamming pressure and a water entry test or 3D numerical method must be performed.

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