The Wind Induced Vibration Analysis Of High-Rising Equipment And Design Of Vibration Absorbing Structure

With the rapid development of petrochemical industry and increasingly stringent environmental requirements, the number of towers with large ratio of height to diameter increases notably. As a result, the frequency of the tower vibration accidents induced by wind is quite high. The wind induced vibration causes significant bend of towers, affecting the normal operation, and also results in excessively high stress, the initiation of fatigue crack, and even leads to damage of the equipment, production pause and personnel casualties. Therefore, wind induced vibration analysis of high-rising equipment and development of vibration absorbing structure have an extremely important significance. In this paper, tuned mass damper (TMD) control research of high-rising equipment under wind induced vibration and development of vibration absorbing structure are carried out. As an example, a flue gas desulfurization tower is considered. The general law of TMD control effect with its control parameters change and the optimal parameters are studied by using the finite element analysis technology. A new type of TMD damping device is designed for the high towers in petrochemical plants and the design parameters are calculated. The main research contents and conclusions are as follows:(1) Modal analysis and wind-induced vibration analysis of a flue gas desulfurization tower are carried out based on accurate three-dimensional finite element model. Simulation results show that the wind induced vibration of the tower take place easily due to the low natural frequency. The resonance amplitude of the tower is large and the stress level is also very high. So the corresponding vibration reduction measures must be taken.(2) TMD control effect with its control parameters change is studied by using the numerical simulation technology and the optimal parameters are discussed. The results indicate that the mass, the frequency ratio and the damping ratio have significant effect on structural vibration control. So it is necessary to optimize these parameters. TMD control system under the optimal parameters can consume more vibration energy and get a better vibration reduction.(3) Based on the harmonic response analysis and the time-history analysis, the wind-induced vibration response of the high tower is obtained and the effect of wind-induced vibration control is also discussed. The calculation results show that TMD control system under the optimal parameters makes the maximum amplitude of tower top decrease greatly and also makes the stress level of the dangerous section of the tower reduce sharply. Therefore, the TMD damping device to control the wind-induced vibration of high-rising equipment is effective.(4) The static and dynamic design parameters of the damping device are calculated and analyzed. A new type of TMD damping device is designed for the high towers in petrochemical plants. The new damping device has the advantages of simple structure. good stability, high vibration reduction efficiency and the low cost. Consequently, it can be used in the high rising petrochemical equipment, such as the flue gas desulfurization tower.