| The large-scale amusement equipment Samba Tower as the subject investigated,in this paper.By means of the finite element software,the dynamic mechanical properties of the rotating frame,which is a key component of the Samba Tower,are analyzed and studied,and the sensitivity of design parameters of it is obtained based on the probability and statistics theory.The analysis of seismic response and wind-induced vibration of the Samba Tower is based on the reference of that reserached on the vibration response of various engineering equipments and building structures(such as tower cranes,transmission towers,high-rise buildings,long-span bridges,etc)subjected to earthquake load or fluctuating wind load,both at home and abroad.In this paper,the probability of the dynamic safety factor meets the specified value of the national standard,which is used to design strength of the rotating frame,is calculated by PDS of ANSYS.To study the loading frequency impact the vibration of the rotating frame,the harmonic response analysis is made.The results show that the loading frequency,which will lead to maximum vibration amplitude,is 4.5Hz.The dynamic mechanical characteristics of it during the rising process are clarified.The rotating frame is the main component of optimization and serialization of the samba tower.It is very important to analyze the influence of each design variables on the design indexs by parameter sensitivity analysis.In this paper,Monte Carlo numerical simulation method is used to analyze the influence of 11 parameters on 4 design indexs.The finite element model of the Samba Tower is established,and the modified El-Centro seismic wave is used to analyze the seismic response of it with full load and no-load.The results show that,in the case of 7 degree seismic fortification intensity,the crest value of tower top displacement with full load coMPared to no-load increased by 17.34%in the X direction,increased by 20.18%in the Y direction,and increased by 15.66%in the Z direction.Also,the crest value of displacement,which of the overhanging arm’s terminatio,with a large increase,in the X direction increased by 87.60%,in the Y direction increased by 93.22%,and the maximum stress of the rotating frame is 121.455MPa,which increased by 19.261%.the analysis of seismic response with no-load under different seismic fortification intensity obtains that the amplitude of vibration of the tower top increases obviously with the increase of seismic fortification intensity.In this paper,two kinds of pulsating winds with different average wind speeds are simulated to analyze the wind-induced vibration response of this machine with full load and no-load.The pulsating wind with 15m/s average speed is used to study the vibration response of it with full load,and the results show the stresses of the rotating frame and the tower meet the requirements.The maximum displacement of tower top is 4.30548mm,and the maximum displacement of the overhanging arm’s terminatio is 30.5427 mm.Ueder no-load condition,the wind load of wind scale 12 results in that the maximum displacement of tower top is 18.8920mm,and the maximum displacement of the overhanging arm’s terminatio is 136.612mm. |
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