弹簧隔振基础中速磨煤机振动性态分析与动力优化  

Vibration behavior analysis and dynamic optimization for a medium-speed mill with spring vibration-isolated foundation

作　　者：朱丽华[1] 彭志丰[1] 彭奕亮 刘永周 魏霞冰 

机构地区：[1]西安建筑科技大学土木工程学院,西安710055 [2]河南省电力勘测设计院,郑州450007

出　　处：《振动与冲击》2012年第22期90-95,共6页Journal of Vibration and Shock

基　　金：国家自然科学基金项目(50908186);长江学者和创新团队发展计划资助陕西省教育厅自然科学专项(12JK0921)

摘　　要：火力发电厂中速磨煤机采用弹簧隔振基础以减小设备工作扰力对主厂房的影响。为分析弹簧隔振基础中速磨煤机的振动性态并评估其振动安全性,对五个电厂八台磨煤机进行现场振动测试。测试基础上、下台板和设备本体的振动线位移。建立磨煤机—基础耦合的有限元模型,进行模态分析和谐响应分析。有限元计算结果与现场动测结果基本一致。对弹簧隔振基础中速磨煤机的设计参数进行优化分析。研究表明,弹簧隔振中速磨煤机基础振动位移满足规范要求,但设备本体振动位移较大,设计中应通过限制基础平台振动位移控制设备本体振动位移。Spring vibration-isolated foundation was used for a medium-speed mill to reduce the impact of equipment disturbing force on the main plant in a thermal power plant. In order to analyze the vibration behavior of the medium-speed mill with spring vibration-isolated foundation and evaluate its vibration safety, eight mills in five power plants were tested in site. The vibration linear displacement of the upper and lower bedplates of the foundation and the equipment bodies were measured. A mill-foundation coupled finite element model was established, and then modal analysis and harmonic response analysis were performed. The calculation results were basically in accordance with the test results. The design parameters of the medium-speed mill with spring vibration-isolated foundation were optimally analyzed. The study results showed that the vibration displacement of the medium-speed mill with spring vibration-isolated foundation meets the code requirements, but the vibration displacement of the equipment body is larger; the vibration displacement of the equipment body can be controlled by limiting the vibration displacement of the foundation platform in design.

关 键 词：弹簧隔振 中速磨煤机 振动性态 动力机器基础 动力优化 

分 类 号：TU311.3[建筑科学—结构工程] TU317