振动流化床干燥机运转引起的楼面振动测试及分析

对振动流化床干燥机运转导致的楼面振动响应进行现场测试,得到了振动设备的扰力、频率、隔振支座的工作性能以及楼面强迫振动响应的规律。基于现场测试结果,利用ANSYS有限元软件对4种不同工况下楼面的强迫振动进行了仿真分析,得到梁板结构的振动和传递规律。结果表明:楼面振动响应在布置振动设备的框架区格内较大,框架梁上测点的振动响应明显小于次梁;振动响应沿楼面纵向测点迅速衰减,并可将多台振动设备的综合振动效应视为单台振动设备振动效应的线性叠加;强迫共振是引起楼面较大振动的内在原因。利用简化连续正交各向异性板模型和结构自振频率灵敏度分析技术快速地获得了结构刚度的最佳修改位置和修改量。最后,采用有限元模型,经试算提出了合理经济的楼板减振处理方案。

THE SPOT TESTING AND FEA OF THE VIBRATION BEHAVIOR OF BEAM-PLATES SYSTEM CAUSED BY THE VIBRATION OF FLUIDIZED BED DRYER

The vibration behavior of beam-plates system caused by the vibration of fluidized bed dryer was tested. The disturbing force and frequency of vibrating equipment,working performance of the existing isolation bearing and response of floor vibration was obtained. According to the spot test results,finite element analysis of simple harmonic vibration was carried out by ANSYS software. The test results show that floor vibration response is larger in frame regions having vibration equipment; vibration response of monitoring points on frame beam is much less than that of monitoring points on secondary beam,vibration response of measuring points decay soon along the floor longitudinal points. The linear superposition comprehensive vibration effect of multiple vibration equipment can be regarded as a single vibration equipment vibration effect,the main cause of factory floor of big vibration is forced resonance. Based on a simply continuous orthotropic plate model and the eigenfrequency sensitivity analysis technique,the optimal modifying position and revisions of the structural stiffness were acquired. Lastly,the vibration reduction treatment scheme was proposed.