۱Dynamic Modeling of a Satellite Equipped with Variable Speed Control Moment Gyros
نویسنده(ها): ، ،
اطلاعات انتشار: شانزدهمین کنفرانس سالانه مهندسی مکانیک، سال
تعداد صفحات: ۸
In this paper, the equations of motion of a satellite equipped with N single gimbal Variable Speed Control Moment Gyros (VSCMG), are derived by the use of Kane’s method. The numbers of VSCMGs, as well as their positions and the direction of gimbal axes have been chosen arbitrary. Compared to other researches, no assumptions have been made of ignoring mass and inertia of the gimbals to increase the precision of the satellite dynamic simulation. The resultant equations are compared to the results obtained from other methods. Analytical equations are solved in MATLAB for a pyramid configuration of VSCMGs and compared to the results obtained from ADAMS model for verification. The simulation results show good compatibility between analytical methods and the results of multi–body dynamics analysis in ADAMS.<\div>

۲Design and Dynamic Modeling of Planar Parallel Micro– Positioning Platform Mechanism with Flexible Links Based on Euler Bernoulli Beam Theory
نویسنده(ها): ، ،
اطلاعات انتشار: Journal of Solid Mechanics، پنجم،شماره۲، Spring ۲۰۱۳، سال
تعداد صفحات: ۱۹
This paper presents the dynamic modeling and design of micro motion compliant parallel mechanism with flexible intermediate links and rigid moving platform. Modeling of mechanism is described with closed kinematic loops and the dynamic equations are derived using Lagrange multipliers and Kane’s methods. Euler–Bernoulli beam theory is considered for modeling the intermediate flexible link. Based on the Assumed Mode Method theory, the governing differential equations of motion are derived and solved using both Runge–Kutta– Fehlberg4, 5th and Perturbation methods. The mode shapes and natural frequencies are calculated under clamped–clamped boundary conditions. Comparing perturbation method with Runge–Kutta–Fehlberg4, 5th leads to same results. The mode frequency and the effects of geometry of flexure hinges on intermediate links vibration are investigated and the mode frequency, calculated using Fast Fourier Transform and the results are discussed.
نمایش نتایج ۱ تا ۲ از میان ۲ نتیجه

ارتباط با ما

لینک‌های مفید