某石化公司聚合物框架振动实测与计算

某石化公司的多区循环反应装置框架在投产后上部结构受到明显振动.为保证结构与设备的安全性和正常使用,对结构的自振特性和振动响应进行了现场实测,实测加速度极值达277 mm/s2.采用逆向工程的方法构造出结构的振动激励源,将激励施加到结构上进行时程计算,所得振动响应与实测结果基本吻合.采用在上部适当位置增设交叉斜撑的方法,可提高结构的自振频率以避开激励频率带,减小结构的振动响应.经计算,南北向加速度幅值可减少76％,东西向加速度幅值减少28％,减振效果明显.

Measurement and Analysis of the Vibration of PP Plant Frame

Significant vibration can be notified in the upper part of pp plant frame while operating in a petro- chemical company. In order to ensure the safety of the structure and equipment, the self-vibration characteris- tics and vibration response of the frame structure are measured in the field. Maximum acceleration is 277 mm/ s2. The excitation source is constructed by reverse engineering method. The vibration response of structure is calculated, with a very close to measured result. A plan of adding cross-bracing in the upper part is calculat- ed. The natural frequency of structure is improved to avoid the excitation frequency band. The north-south ac- celeration amplitude would be reduced 76% while the east-west amplitude would be reduced 28%. The reduc- tion of vibration is remarkable.