弹簧隔振基础中速磨煤机振动性能分析与优化-结构工程专业论文.docxVIP

西安建筑科技大学硕士学位论文 西安建筑科技大学硕士学位论文 Vibration behavior analysis and dynamic optimization for a medium-speed mill with spring vibration-isolated foundation Specialty: Structure Engineering Master Candidate: Yang Yuhan Supervisor: Prof.Zhu Lihua Abstract Medium-speed mill is the important auxiliary dynamic equipment of the electric power plant, spring vibration isolators are adopted to control the vibration of mill and ensure the normal operation of equipment and guaranty the safety of surrounding buildings. So far, structural engineers always adopt the simple theory of the dynamic characteristic matching to design the medium-speed with spring vibration-isolated foundation which the major consideration is the vibration displacement of top of the foundation, and the phenomenon of the equipment vibration is transfinite may be appeared. So the vibration behavior analysis and dynamic optimization for medium-speed mill with spring vibration-isolated foundation is very important. The dynamic performance test of medium-speed mill of five electric power plant have been made in this paper, and the 3D solid model and the modal analysis of the mill are made by ANSYS finite element software, and the natural vibration frequency and mode of medium-speed mill are obtained. Then the harmonic response analysis has been taken to obtain the dynamical response and frequency-amplitude curve, and the validity has been proved by comparing the field test and the finite element analysis result. The dynamic response is decreased by contrasting the vibration of the mill with spring vibration-isolated foundation and without, that concern the vibration response of mill can be decreased by using spring vibration-isolated foundation. Then the variation of the inherent property of the mill has been analyzed by changing the mass ratio of foundation and equipment, and the number and stiffness of spring vibration isolator. Finally, the optimality analysis of medium-speed mill has been made by the optimizatio