Loading...
Search for:
multibody-dynamics
0.005 seconds
Determination of Landing Gear Loading in Landing Process Using Multi-body Dynamics Softwares
, M.Sc. Thesis Sharif University of Technology ; Haddadpour, Hassan (Supervisor)
Abstract
In this project, the landing process is simulated by using of multi-body dynamics commercial software. Various factors, including landing situations, aircraft structures and climate are used in this simulation. The purpose of this project is to determine the forces exerted on the aircraft landing gears in landing process in various landing conditions. For this purpose, the ADAMS multi-body dynamics software is used. At first, different scenarios based on FAR-25, including level landing, tail-down landing, crab landing are simulated. Results of dynamic simulation software with landing load factor obtained from the analytical solution are compared. Then for the level landing, different...
Investigation of Performance and Aeroelastic Characteristics of Wind Turbine Blades Based on Flexible Multibody Dynamics Model
, M.Sc. Thesis Sharif University of Technology ; Ebrahimi, Abbas (Supervisor)
Abstract
Aeroelasticity analysis and prediction of wind turbines sturcture deformations are fundamental parts in their design. Increasing the size of wind turbine blades and development of Mega-watt sized wind turbines have enhanced the importance of these studies. In this study, the aeroelasticity analysis of a wind turbine blade has been done based on flexible multibody dynamics method. For this purpose, the modal approach has been used for modeling blade structure which has been considered as a flexible beam with bending and torsion degrees of freedom. The unsteady vortex lattice method has been used to calculate aerodynamic loads in order to combine with wind turbine blade structure model. Using...
Dynamic Analysis and Intelligent Control of an Offshore Marine Crane for Safe Load Carrying
, M.Sc. Thesis Sharif University of Technology ; Selk Ghafari , Ali (Supervisor) ; Zabihollah, Abolghasem (Co-Advisor)
Abstract
Marine cranes are installed on vessels to transfer or transport payloads between ships or between ships and decks. One of the most critical issues in this case is the safety during load transferring. Marine cranes move or sway in unexpected direction, when they are influenced by wave, wind and storm. Theprocess of controlling them became difficult without using automatic control methods. Ingeneral, the movement of cranes has no prescribed path.This master thesis is about dynamic modeling and control of fixed crane placed on an offshore vessel. The main challenging problem in this work will be developing an accurate mathematical model of the crane. Therefore, bond graph method which is known...
Hierarchical decentralized control of a five-link biped robot
, Article Scientia Iranica ; Volume 25, Issue 5B , 2018 , Pages 2675-2692 ; 10263098 (ISSN) ; Salarieh, H ; Foumani, M. S ; Sharif University of Technology
Sharif University of Technology
2018
Abstract
Most of the biped robots are controlled using pre-computed trajectory methods or methods based on multi-body dynamics models. The pre-computed trajectory-based methods are simple; however, a system becomes highly vulnerable to the external disturbances. In contrast, dynamic methods make a system act faster, yet extensive knowledge is required about the kinematics and dynamics of the system. This fact gave rise to the main purpose of this study, i.e., developing a controller for a biped robot to take advantage of the simplicity and computational efficiency of trajectory-based methods and the robustness of the dynamic-based approach. To do so, this paper presents a two-layer hierarchical...
A comparative study on the fatigue life of the vehicle body spot welds using different numerical techniques: Inertia relief and modal dynamic analyses
, Article Frattura ed Integrita Strutturale ; Volume 14, Issue 52 , 2020 , Pages 67-81 ; Farrahi, G. H ; Kashyzadeh, K. R ; Azadi, S ; Jahani, K ; Sharif University of Technology
Gruppo Italiano Frattura
2020
Abstract
Owing to the expensive and time-consuming nature of durability experiments, finite element based durability analysis is quite prevalent in the automotive industry. Numerical fatigue life analyses are typically divided into two different categories, the quasi-static methods which are faster and the dynamic methods which are more accurate. The aim of this paper is to compare the inertia relief and modal dynamic approaches in terms of formulation, accuracy and computation time. The chosen case study is the fatigue life of the vehicle body which is considered the main load-bearing component in a vehicle. By utilizing multi-body dynamics model and driving the vehicle on different standardized...