Stability and nonlinear dynamic analysis of gas-lubricated system with elastomer suspension
| Autor: | Suming Yang, Qing Li, Feifei Yu, Jue-Ying Li, Li Xueqin |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Materials science
Aerospace Engineering Ocean Engineering 02 engineering and technology 01 natural sciences law.invention 0203 mechanical engineering law 0103 physical sciences medicine Rigid rotor Electrical and Electronic Engineering Suspension (vehicle) 010301 acoustics Rotor (electric) Applied Mathematics Mechanical Engineering Equations of motion Stiffness Mechanics Reynolds equation Condensed Matter::Soft Condensed Matter Vibration Nonlinear system 020303 mechanical engineering & transports Control and Systems Engineering medicine.symptom |
| Zdroj: | Nonlinear Dynamics. 94:2161-2176 |
| ISSN: | 1573-269X 0924-090X |
| DOI: | 10.1007/s11071-018-4481-x |
| Popis: | This paper presents the dynamic behavior of a rigid rotor supported by a pair of self-acting gas-lubricated bearings which is used in a turbo-expander, the key equipment in a large-scale cryogenic system. In order to restrict the vibration of the rotor relative to bearings, elastomers are mounted between bearings and shell. A finite difference method has been employed to solve the Reynolds equation in time-dependent states. The center orbits of the rotor are got by solving the motion equations. The system state trajectory, Poincare maps, logarithmic spectra maps and bifurcation diagrams are used to analyze the dynamic behavior of the system. The effect of the elastomer suspension to absorb the vibration is verified by comparison with the system with rigid suspension. A set of mass values, damping exponent values and stiffness of elastomer are calculated and compared in this paper. The results show that the rotor center loses its regular behavior gradually with the increase in the rotor mass. The square damping exponent model of the elastomer shows more stability than linear damping suspension model, and the quadratic damping exponent model has a similar motion behavior compared with a linear model. A suitable stiffness of the elastomer is important to the stability of the system. The elastomer with a low stiffness may cause the large amplitude of the vibration, and the system may lose its regular behavior when the stiffness is large enough. |
| Databáze: | OpenAIRE |
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