分段轴承支撑转子的非线性动力学分析-机械制造及其自动化专业论文.docxVIP

万方数据 万方数据 独创性声明 本人声明所呈交的学位论文是本人在导师指导下进行的研究工作和取得的研究成 果，除了文中特别加以标注和致谢之处外，论文中不包含其他人已经发表或撰写过的 研究成果，也不包含获得 兰州交通大学 或其他教育机构的学位或证书而使用过的材料。 与我一同工作的同志对本研究所做的任何贡献均已在论文中作了明确的说明并表示了 谢意。 学位论文作者签名： 签字日期： 年 月 日 学位论文版权使用授权书 本学位论文作者完全了解 兰州交通大学 有关保留、使用学位论文的规定。特授权 兰州交通大学 可以将学位论文的全部或部分内容编入有关数据库进行检索，并采用影 印、缩印或扫描等复制手段保存、汇编以供查阅和借阅。同意学校向国家有关部门或 机构送交论文的复印件和磁盘。 （必威体育官网网址的学位论文在解密后适用本授权说明） 学位论文作者签名： 导师签名： 签字日期： 年 月 日 签字日期： 年 月 日 兰州交通大学硕士学位论文 Abstract The quality of the vibration state of turbocompressor units is significantly affected by two main factors including the reduction of driving forces and the critical frequencies detuning of rotation operation. During the entire range of rotation frequencies, the balancing degree of quality rotor is one of the important criteria that measure whether the turbo- compressor can work reliably or not. Generally, such a balancing degree depends on the balancing frame, the balancing weight systems, and the choice of stiffness and resistance coefficients of rotor systems. On the other hand, the critical frequencies of rotors are primarily influenced by the dynamic characteristics of segmental bearings. In this thesis, we considered the nonlinear dynamics of turbo-compressor and the obtained results shows that the estimated reliable values of stiffness and damping coefficients can make the prediction for the rotor performance of high-speed turbo-compressor unit be more accurate. A set of effective methods are developed to estimate the parameters of mathematical models of rotor systems and the program to obtain the values of stiffness and damping coefficients of bearings based on the experimental data accumulated in the process of balancing rotors on the HSBS. The impact of internal resistance of the horizontal rotor on the parameters of its synchronous precession has been mathematically revealed, meanwhile, the method to estimate this impact has been proposed by introducing an equivalent external damping in the central part of the rotor. The obtained results