【作者】 蒋伟；

【导师】 郭伟；

【作者基本信息】 天津大学 ， 机械制造及其自动化， 2007， 硕士

【摘要】 虚拟样机具有传统开发模式所无法替代的优势,它可以显著地提高设计质量、降低产品开发成本。由于灯泡贯流式发电机是目前低水头发电设备的主流产品,具有结构复杂、技术含量高等特点,因此属于典型复杂机械产品范畴。本文所研究的轴系转动部件是水轮机组关键部件之一,由于轴系转动部件(尤其是转轮)所处工作环境非常复杂,存在许多未知因素,因此运用虚拟样机技术对轴系系统进行建模分析研究,具有十分重要的意义。本论文的研究工作主要包括以下几个方面。(1)分析了在复杂产品开发及研制阶段虚拟样机技术的应用,阐述了串并行相结合的新型产品开发模式;通过层次化信息分解,提出了复杂产品虚拟样机数学表示方式。对ADAMS虚拟样机仿真软件的求解方法及相关理论做了详细的分析。(2)结合水轮发电机转轮的技术特点及相关参数,指出了水轮机转轮强度及模态分析重要意义,对4种工况下转轮的应力应变分布进行深入研究。最后对水轮机转轮的动力学模态做了分析研究。(3)基于虚拟样机建模理论,结合灯泡贯流式水轮发电机组轴系系统的开发、制造特点,研究了复杂产品虚拟样机建模技术的理论基础。通过对整个转动轴系的仿真计算,得出了在额定转速条件下,组合轴承及支撑轴承所承受支反力的变化规律,验证了轴承强度。并且得到了水轮机从静止状态到飞逸状态的过渡过程中,两个轴承受力变化规律。对轴系转动部件的振动性能进行了探索性的研究,得出了在不同刚度的轴承组合方案下,轴系系统的固有频率及临界转速的变化。更多还原

【Abstract】 Virtual Prototyping Technology has the advantage that will never be replace by other method. It is able to improve the designing quality and reduce product cost .Bulb tubular-turbine generator has been widely used at present. It is bulk、complex and high- Technology . Therefore, it is typical complex machine. One of the key parts of Bulb tubular-turbine generator is Turbine Shaft System. But the working condition of the Turbine Shaft System (especially Turbine Runner) is extremely complex. There is a great deal of unknown factor so that it is very important to describe its running rule by math model. So it is significative to carry on investigations on dynamics and statics of turbine shaft system by Virtual Prototyping Technology.The content of this paper is:(1) The application of the Virtual Prototyping Technology in the phase of the development of the complicated produce is explored. The module、solution method and related theory in detail are discussed in the paper.(2) Combined with the specialty and related parameter of the turbine generator runner, the importance of intension and mode analysis of the runner is pointed out. Besides, the stress and deformation is researched deeply.In conclusion, the dynamics mode of the turbine generator runner is also researched in the paper.(3) Based on Virtual Prototyping modeling theory, associated with the peculiarity of Bulb tubular-turbine generator shaft system, the virtual prototyping modeling theory of the complicated system is investigated in the paper. Via the emulation of the whole shaft system, the force change rule of the supporting bearing under the rated speed condition is obtained. The force change rule when the speed rises from stillness to run-away speed is also acquired. The exploratory researches are also maked on vibrancy performance of the shaft system in the paper.更多还原