Abstract: A mobile trolley is a form of mechanical ground support equipment that allows engineers to perform integration work at various parts of the satellite body in a safe manner, thus preventing mishandling of the satellite. Existing mobile trolleys available in the market have several limitations, whereby its height is not adjustable and typical mobile trolley doesn’t have any mechanism to transport a satellite into the thermal vacuum chamber to undergo environmental test. Therefore, this project was proposed to design and develop a Motorised Adjustable Vertical Platform (MAVeP), an improvement to existing mobile trolleys, which has the ability to move around, to increase or decrease its height and finally, to be able to transport the satellite into the thermal vacuum chamber. The MAVeP is expected to provide assistance in the assembly, integration and testing operation without jeopardizing the safety of the spacecraft.)

• Publication Date: 13-Mar-2016
• DOI: 10.15224/978-1-63248-090-3-49
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Abstract: This paper demonstrates experimentally, theoretically, and numerically, for the first time, a wide-range tunability of an in-plane clamped-clamped microbeam, bridge, resonator actuated electrothermally and electrostatically. Using both actuation methods, we demonstrate that a single resonator can be operated at a wide range of frequencies. The microbeam is actuated electrothermally, by passing a DC current through it, and electrostatically by applying a DC polarization voltage between the microbeam and the stationary electrode. We show that when increasing the electrothermal voltage, the compressive stress inside the microbeam increases, which leads eventually to its buckling. Before buckling, the fundamental frequency decreases until it drops to very low values, almost to zero. After buckling, the fundamental frequency increases, which is shown to be as high as twice the original resonance frequency. Adding a DC bias changes the qualitative nature of the tunability both before and aft

• Publication Date: 13-Mar-2016
• DOI: 10.15224/978-1-63248-090-3-67
• Views: 0
• Downloads: 0