Rub-Impact Investigation of a Single-Rotor System Considering Coating Effect and Coating Hardness
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ORIGINAL PAPER
Rub‑Impact Investigation of a Single‑Rotor System Considering Coating Effect and Coating Hardness Yang Yang1 · Jie Tang1 · Guo Chen2 · Yiren Yang1 · Dengqing Cao3 Received: 22 July 2020 / Revised: 22 August 2020 / Accepted: 31 August 2020 © Krishtel eMaging Solutions Private Limited 2020
Abstract Background Rub-impact of rotor–stator is one of the major problems for stability and safety of a rotating machine. As a result, the characterization of rub-impact force gradually becomes a crucial factor in the dynamic responses prediction of the rotor system. Methods First, the applicable scope of classical rotor–stator rub-impact force models is discussed in this paper. Then, taking a Jeffcott rotor as the research object, rub-impact force models under hard coating, soft coating and general condition are established respectively based on the equivalent linearized method. Finally, dynamic responses of the rotor system are numerically calculated by the linear interpolation method, and the change laws of impact stiffness are further analyzed under different conditions. Then, the effects of the engine coatings on the dynamic characteristics of the rotor system are studied in detail. By means of bifurcation diagram, time histories, whirling orbits, spectrum and impact force diagram, the dynamic variations are revealed. Conclusions The results suggest that the dynamic responses of system are closely related to the coating hardness. Meanwhile, the full annular rub and partial rub are affected by the coating hardness to a great extent. Keywords Jeffcott rotor · Rub-impact · Coating · Dynamic characteristics
Introduction Recently, the rotating machine has developed toward the direction of high rotating speed, high thrust weight ratio and high efficiency. Hence, the clearances between rotors and stators are designed smaller and smaller, which increases the possibility of rub-impact between rotor and stator. When rub-impact between rotor and stator happens, the system is unsmooth and high dimensional strong-nonlinearity [1]. For this complicated dynamic problem, how to build a reasonable rub-impact model is to be solved first. Based on mature contact and impact theory, large amount of scholars in and abroad propose a lot of models of rub-impact force which can be classified as rigid rub-impact and elastic rub-impact. * Jie Tang [email protected] 1
School of Mechanics and Engineering, Southwest Jiaotong University, Chengdu 610031, China
2
National Key Laboratory of Science and Technology on Reactor System Design Technology, Nuclear Power Institute of China, Chengdu 610213, China
3
School of Astronautics, Harbin Institute of Technology, Harbin 150001, China
The latter one includes temporary impact model and continuous contact force model. Compared with other rub-impact force models, continuous contact force model not only can solve the problem of contact force which change over time [2], but also can describe the process of elastomer compression and expansion. Thereby, it can comprehensively re
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