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Discrete dynamic modeling of shafts with transverse cracks using bond graph
, Article 2003 ASME Design Engineering Technical Conferences and Computers and Information in Engineering Conference, Chicago, IL, 2 September 2003 through 6 September 2003 ; Volume 5 B , 2003 , Pages 1579-1584 ; Borhan, H ; ASME ; Sharif University of Technology
American Society of Mechanical Engineers
2003
Abstract
Discrete dynamic modeling of rotating Timoshenko shafts deflecting in axial, shear and bending directions is discussed in this article. The method presented here aims for developing an algorithm by which shafts with transverse cracks can easily be modeled and analyzed. To this end, a modular dynamic network is constructed, consisting of a mass, springs and dampers, resembling shaft segments between cracks. The local changes in shaft stiffness as a result of cracks rotating (opening and closing), is entered into the module models as change in springs and dampers properties. The modular model is then repeated to obtain a complete shaft model. Bond Graph method is used in a similar modular...
Developing a Method for the Dynamic Analysis of Flexible Flapping Wing
, M.Sc. Thesis Sharif University of Technology ; Meghdari, Ali (Supervisor)
Abstract
Flapping is one of the most usual solutions to produce aerodynamic lift and propulsive force in natural flights, in low Reynolds number. A sample flapping wing mechanism in which propulsion system consists of a battery, two very small DC electrical motors, two gearboxes, a flapping mechanism and flexible beams as wings is studied in this project.Different methods have been proposed to derive the governing equations of motion and simulate the flapping wing system. The main disadvantage of the previous proposed works is the lack of a comprehensive dynamical analysis of the complete system including its components.Therefore, the main objective of the present research is to propose an efficient...