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This paper presents the results of the dynamic stability analysis of a flexible spinning launch vehicle subjected to thrust modeled as a thin-walled composite beam with circular cross section. Due to the presence of gyroscopic forces, we mainly aimed to find divergence and/or flutter instabilities and establish the stability boundaries of the spinning beam. For this purpose, we implemented a circumferentially...
Dynamic stability of a free flight aerospace vehicle is investigated in this paper. Firstly, the slender rocket body is modeled as a classic uniform beam that subjected to constant end rocket thrust. The one-dimensional free-free beam under follower force is established for structural model to discover dynamic stability. Equations of motion of vehicle is derived by applying extended Hamilton's principle...
This paper contains calculations about propellant slosh for an upper stage rocket. The liquid fuel is modeled by using an equivalent mechanical model, from this point of view the stability of this rocket is examined by means of mass-spring model. In theory, a nonlinear mathematical model is derived and nonlinear feedback control laws are used. Specifications of the Attitude Vernier Upper Module (AVUM)...
ITU-pSAT II project aims to design and develop standardized bus architecture and an ADCS for pico and nano sized satellites. In order for nano-satellites to perform more capable missions, precise attitude control and more capable bus designs are needed. ITU-PSAT II is considered as follow-on to the ITU-PSAT I project, it includes multi-purpose bus and a 3-axis controlled platform, which can be used...
In this paper, we present the design and analysis of an innovative modular cubesat structure for ITU pSAT II mission. The design hinges on innovative modular structural columns which support rack-like operation for our ITU pSAT II nanosatellite. ITU pSAT II aims to demonstrate on-orbit a standardized bus architecture and an indigenous in-house developed ADCS. The envisioned structure provides the...
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