The Vibration Control Analysis Of The High-pole Lamp Based On Roll Damping

In the constantly improving process of urban infrastructure,high-pole lamp light is widely constructed in crowded open fields,such as square and playground,for its good lighting performance.In recent years,it becomes more and more sensitive to wind load because of the increasing pole lamp height.Under dynamic loads,such as heavy wind,the upper may take place resonance response.It will directly cause structural fatigue damage,reduce the lifespan of the high-power lamps and lanterns,cause destruction structure resonance.Therefore,using the modern structure vibration control technology has a certain practical significance.In this paper,we install TRMD dampers in high lamp light plate for vibration control.First of all,we turn the actual high lamp to simplification lumped mass model,getting 2 D series model.Then using Lagrange equations of motion,we will get highly nonlinear motion differential equations of the model with TRMD.At the same time,the motion equation of controlled system can be simplified by using a small amount of assumptions.Based on the theory of resonance,we can get the optimum design parameters.Considering the spatial randomness and spatial correlation of the fluctuating wind,we use the harmonic superposition method to get the numerical simulation of fluctuating wind and use the target spectrum to test sample.We also consider the dynamic function of horizontal direction wind load on the high-pole lamp light.Wind load is the factor that lead high lamp to random vibration.First of all,we make six wind load samples of different amplitude acted on the controlled system,and get the control effect under the different load condition.The simulation results show that TRMD has good control effect and the control effect increases with the height,but the quality of the TRMD ratio and frictional coefficients should be determined by the design wind speed.By analyzing the control effect of the different decorate position,it can be concluded that the control effect of vertex arrangement is best,the control effect of three impact arrangement is not obvious,the control effect of decorate midpoint arrangement decreases obviously.Finally,we get the control effect of wind-induced vibration by Monte Carlo simulation method,the results show that TRMD not only has better control effect under the random windload,but also can reduce the time of the system reaching steady state,so using TRMD for wind-induced vibration control can improve its durability.Earthquakes are also the factor that lead high lamp to random vibration.We make ELcentro wave,Cape wave,Wenchuan wave,Chichi wave with the same amplitude acted on the controlled system,and analysis seismic vibration control effect of TRMD.The results show that the control effect of TRMD under different seismic wave is different,and it can not effectively control the first peak response.Based on the different control effects under wind load and earthquakes,it can be found that the TRMD control effect of former is better.Using Fourier transform for the acceleration response,through the acceleration Fourier spectrum it can be seen that under the wind loads,the amplitude of the first order frequency in the Fourier spectrum was significantly reduced,while under ELcentro and Chichi wave it is no obvious effect.Through analyzing the characteristics of this two kinds load,we can find the reasons for this phenomenon,and puts forward the solution.