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The dynamics of motorised momentum exchange tether (mmet) with dynamic boundary conditions /Choo Jacqueline

The dynamics of motorised momentum exchange tether (mmet) with dynamic boundary conditions_Choo Jacqueline_A2_2015_NI
Tesis ini membincangkan tentang reaksi kabel angkasa dalam persekitaran angkasa apabila dikenakan syarat sempadan dinamik. Kabel angkasa ini dimodelkan supaya menjadi berterusan dan fleksibel untuk mendapatkan reaksi kabel yang tepat dan betul berkenaan dengan pengerakan menegak dan mendatar. Keadaan sempadan dinamik yang akan dikaji dalam kajian ini adalah sambungan tetap dan sambungan kedua-dua penghujng. Bentuk mod bagi keadaan-keadaan sempadan di atas dan persamaan untuk pengerakan bagi kabel angkasa yang diperolehi dengan menggunakan Persamaan Lagrange. Dengan menggunakan perisian Mathematica ini, simulasi reaksi kabel boleh dilakukan dan keputusan dapat dianalisis. Kehadiran tork dalam Motorised Momentum Exchange Tether (MMET) menyebabkan gerakan berputar dalam sistem kabel mengakibatkan trend yang meningkat untuk anjakan sudut dan halaju sistem. Tanpa tork yang diperkenalkan, sistem kabel hanya bergerak dalam gerakan harmonik. Terdapat juga kehadiran parameter sentakan dalam sistem model yang akhirnya memberi kesan kepada simulasi kabel itu. Parameter sentakan ini menunjukkan keperluan untuk penyelidikan yang mendalam terutama dalam spesifikasi kabel bagi kajian masa depan yang melibatkan kabel angkasa. ______________________________________________________________________________________ This thesis discussed about the responses of space tether in the space environment when subjected to dynamic boundary conditions. The tether is modelled to be continuous and flexible in order to accurately capture the tether’s response with respect to longitudinal and the transverse deformation. The two dynamics boundary condition, the fixed-attached and the both-ends attached condition have been used in this study. The mode shape for the above boundary conditions and the equation of motion of the space tether are derived and developed using Lagrange’s Equations. By using the Mathematica software, the simulation of the tether’s response is carried out and the results of the computation are analyzed. The presence of torque in the Motorised Momentum Exchange Tether (MMET) induced the spinning motion of the tether system causing an increasing trend of the angular displacement and the velocity of the system. In the condition where torque is absent, the liberation condition occurred in harmonic motion and the spin motion does not exist. There is also the presence of ‘jerk’ parameter in the modelled system that eventually affects the simulation of the tether. This ‘jerk’ parameter shows the need for the additional research in tether’s specifications for the future studies involving space tether.
Contributor(s):
Choo Jacqueline - Author
Primary Item Type:
Final Year Project
Language:
English
Subject Keywords:
space ; environment ; shape
First presented to the public:
6/1/2015
Original Publication Date:
10/21/2019
Previously Published By:
Universiti Sains Malaysia
Place Of Publication:
School of Aerospace Engineering
Citation:
Extents:
Number of Pages - 126
License Grantor / Date Granted:
  / ( View License )
Date Deposited
2019-10-21 17:00:13.937
Submitter:
Nor Hayati Ismail

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The dynamics of motorised momentum exchange tether (mmet) with dynamic boundary conditions /Choo Jacqueline1 2019-10-21 17:00:13.937