HTGR Knowledge Base

Conference Article: Dynamics Analysis of Very Flexible Rotor

Abstract

In the project of 10MW high temperature gas-cooled reactor (HTR-10 GT), helium turbine will be use in the first circle of the high temperature gas-cooled reactor. The preliminary design of its power conversion unit (PCU) tries to use active magnetic bearing (AMB) to sustain the 1.5 ton gas turbine and generator to run under a high speed of 15,000rpm, over the second bending critical frequency [1]. A small dynamics similar prototype, which includes a very flexible rotor and a set of magnetic bearing device, is set up to test the feasibility of running through the bending critical frequency [2]. This paper will give an overview on the dynamic analysis of this very flexible rotor in the prototype device. Dynamics analysis is one of the most important aspects of rotor design. Proper modeling of rotor’s dynamics behavior plays a crucial role in the control design of rotating machines and erroneous dynamics design selection can cause uncontrollability or severe machine failure. In this paper, dynamics analysis will perform the critical speed analysis and force response analysis (unbalance response), which will take into account the gyroscopic effect by use of finite element analysis method.

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Reference:

Proceedings of the Conference on High Temperature Reactors, Beijing, China, September, 22-24, 2004

International Atomic Energy Agency, Vienna (Austria)

HTR-2004, pp:1-6