期刊
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
卷 131, 期 -, 页码 166-182出版社
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ymssp.2019.05.030
关键词
Rotor system; Joint interface; Stiffness loss; Non-continuity
资金
- National Natural Science Foundation of China [11772022, 51575022, 51475021]
Applying a heavy load to the rotor system of aero-engine can drastically reduce the stiffness in rotor joints, which is called non-continuity of the rotor and can affect the joint dynamics. Although the dynamics of a rotor system with multiple joints may be negligibly perturbed by a decrease in joint stiffness, this phenomenon is much more striking in advanced, next-generation aero-engines because their rotor structure is lighter and their loads are heavier. We thus investigate the mechanism leading to non-continuity in rotor joints to clarify how joint stiffness deteriorates upon applying a heavy load to rotor joints. This investigation combines a numerical model of joint stiffness with a model of rotor stiffness, which we use to study the dynamic characteristics of a rotor system. The results of the numerical simulation of rotor dynamics reveal that a decrease in joint stiffness leads to a significant concentration of strain energy around the joints when the rotor undergoes bending-mode vibrations, which decreases the critical speed. To avoid loss of joint stiffness and suppress rotor vibration, we develop a method to optimize the support stiffness of the rotor system and demonstrate its effectiveness experimentally. (C) 2019 Elsevier Ltd. All rights reserved.
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