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contributor authorBarbosa Moreira, Alysson Bruno
contributor authorThouverez, Fabrice
date accessioned2022-02-04T14:38:29Z
date available2022-02-04T14:38:29Z
date copyright2020/01/29/
date issued2020
identifier issn0742-4795
identifier othergtp_142_04_041004.pdf
identifier urihttp://yetl.yabesh.ir/yetl1/handle/yetl/4274083
description abstractThis paper proposes the simulation of a complete mechanical model of a turbomolecular pump rotor, including rotor and blades flexibility, suspended by controlled active magnetic bearings. The mechanical model is composed of an eight stage blisk, attached to a shaft. Magnetic forces are linearized by the first-order Taylor expansion around a given point. Including blades and rotor flexibility makes the mechanical system asymmetric, so the equations of motion for the coupled system have periodic terms. A modal controller was designed to control rigid body modes, since the number of sensors is limited and no state observer is implemented. PID controllers are used for low frequency modes combined with the second order filters to damp high frequency modes. First of all, stability analysis was carried out for the axisymmetric case. Second, blades flexibility was included. Forced response of the whole system to an impulsive force was studied. Divergent responses for the system in rotation were obtained as a second order filter pole possibly interacting with blades modes. Taking the second order filters off the control loop allowed the system to be stable. These results show that the analysis method developed here is efficient to evaluate the performance of a controller in closed loop with the complete flexible system. This method may be used in industrial design processes as computation times for the complete system are very short.
publisherThe American Society of Mechanical Engineers (ASME)
titleInfluence of Blade Flexibility on the Dynamic Response Simulation of a Turbomolecular Pump on Magnetic Bearings
typeJournal Paper
journal volume142
journal issue4
journal titleJournal of Engineering for Gas Turbines and Power
identifier doi10.1115/1.4044733
page41004
treeJournal of Engineering for Gas Turbines and Power:;2020:;volume( 142 ):;issue: 004
contenttypeFulltext


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