Abstract Finite element method is used to analyze the flexural vibrations of beams using Galerkin approach for both Bernoulli and Timoshenko theories.The methodology is started by integral formulation of the partial differential equations for the physical problem, and then the element stiffness, mass matrices and load vector have been obtained. Free vibrations analysis is used for the predictions of natural frequencies and mode shapes for, first flexural vibrations by classical theory, second flexural vibrations by including the effect of shear deformation and rotary inertia in the analysis. Finally, the axial and torsional vibrations, in addition to flexural vibrations, in both transverse and lateral directions together have been taken into consideration, thus the finite element equations and the element stiffness, mass, and load vector matrices have been developed for axial, torsional, and flexural vibration together.The natural frequencies are tabulated for all classical types of classical boundary conditions. The mode shapes corresponding to the natural frequencies were presented graphically. The exact solutions and results obtained by other standard methods are used for comparison with the current numerical results. The forced vibrations were introduced for the analysis of dynamic behavior of beams under several types of loading. The finite element code with Taylor series method and mode superposition for the Bernoulli and Timoshenko beams has been carried out. Numerical results are presented in the form of comparisons between the Bernoulli and Timoshenko and demonstrate how the effect of shear deformation reduced the displacement response with increasing the excitation frequency, excitation amplitude, and length of the beam. Comparisons are made with the exact and existing classical methods and checked with those obtained IVusing standard methods (ANSYS package) and are found in good agreement. It should be noted that all models of beams have always convergence to the correct solution.
أمنة احمد القلفاط (2009)

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Creation of Wind Velocity Contour Map to Calculate Design Wind Velocity for Libya

Abstract The new trend of development in Libya is building a more high rise buildings (tall buildings) in dense populated cities like Tripoli to limit the horizontal expansion of the cities.Therefore, an accurate estimation of wind load is an important factor for the design of such tall buildings.This research examines the effects of wind on the design of buildings, and explaining wind types dominating territory. The thesis main focus is analysing the wind data collected from 22 meteorological stations distributed around the country.The wind data analysis is carried out by using a probability distribution model that created an estimation of the design wind speed with a return period of 50 – year for each city’s station.The established wind speed is then used to create a design wind speed contour map for the entire country using special software.
محمد بشير أبوهدامة (2009)

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Influence of Design Tip Speed Ratio and Rated Wind Speed on Energy Yield of Horizontal Axis Wind Turbine

Abstract Wind turbines are the means of converting wind energy into electrical energy. It is not unexpected that certain brands of horizontal wind turbines are optimally designed for certain wind speed regimes prevailing at certain sites. It has been the objective of this study to find out whether it is possible to design a wind turbine that is more suitable for a site of lower annual mean wind speed such as the western coast of Libya. In achieving this objective, use was made of a typical wind turbine aerodynamic design and performance analysis procedure together with actual wind speed data recorded at the city of Misurata.Based on the annual wind energy yield obtained from different designs of wind turbines having different rated wind speeds and different blade design tip speed ratios, this study indicates that the decrease of the rated wind speed leads to a continuous increase of annual energy yield as well as an increase of the cost of the wind turbine. Therefore the optimum value of rated wind speed for this site may only be determined as a compromise between added wind energy yield and added cost. Moreover, for any given rated wind speed this study indicates that a blade design tip speed ratio equal to six seems to be the optimum value for the given site.
محمد على نايلي (2015)

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أ. سعيد ساسي جمعه القطوس

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بعض المنشورات التي تم نشرها في كلية الهندسة

Flexural Vibrations Of Beams

Creation of Wind Velocity Contour Map to Calculate Design Wind Velocity for Libya

Influence of Design Tip Speed Ratio and Rated Wind Speed on Energy Yield of Horizontal Axis Wind Turbine

المجلات العلمية

بعض المجلات العلمية التي تصدر عن كلية الهندسة

كلية الهندسة

كلية الهندسة جامعة طرابلس

كلية الهندسة

كلية الهندسة جامعة طرابلس

كلية الهندسة في صور

الالبومات الخاصة بفعاليات كلية الهندسة

مناقشة ماجستير لذوي الاحتياجات الخاصة

حفل تكريم ووفاء

تكريم الطلاب المتفوقين بكلية الهندسة 2022

منتدى ليبيا للتعليم والتدريب