Study On Vibration Load Spectrum Of Random Vehicle Running On Urban Road

With the development of urban underground space,the vibration of underground space caused by vehicle load is of great concern.Vehicle load is one of the basic variable loads of municipal road.At present,there are few studies on the load spectrum of municipal road vehicles in China,and no known vehicle load spectrum is formed.Therefore,it is of great scientific significance and engineering application to study the load spectrum of municipal road vehicles and the research on the vibration isolation performance of underground space.In this paper,three different municipal roads in Panyu District of Guangzhou City are taken as the research object.The field traffic statistics are counted and the vibration of the four kinds of mainstream models is tested at different time points.Using MATLAB calculation software,the load spectrum of random hybrid vehicle which can reflect the actual traffic flow of municipal road is simulated by theoretical analysis and numerical simulation.In this paper,ANSYS finite element software is used to build the simplified structure model of the steel spring floating plate on the underground space.Based on the simulated load spectrum,the vibration effect of the steel spring floating plate is analyzed.The main research methods and results are as follows:(1)In order to analyze the statistical characteristics of the actual traffic flow,from a statistical point of view,the collected traffic data in accordance with the car,small trucks,trucks,buses,four kinds of mainstream models for classification statistics,analyze the statistical characteristics of the sample.The Gaussian mixed mathematical model is established to simulate the mixed traffic flow,and the probability density function of the Gaussian mixture model is obtained.(2)In order to simulate the vehicle load spectrum of four kinds of mainstream single models,this paper takes the four kinds of mainstream single models to study the vibration acceleration time of the road at different speed.Using the theory of response spectrum and accurate algorithm,the response spectrum of each single vehicle load is obtained by MATLAB software programming.The response spectrum is taken as the target response spectrum,according to the theory of triangular series superposition,through the MATLAB software programming,simulation to meet the target responsespectrum of each single model vehicle load time course.By comparing the response spectrum with the target response spectrum,we can find that the simulation method is feasible and the accuracy of the simulated data is high,which provides good data support for simulating the load spectrum of random hybrid vehicle.(3)In order to simulate the load spectrum of random hybrid traffic vehicle,according to the probability density function of the Gaussian mixture model of traffic flow,the mixed vehicle flow time series conforming to the statistical characteristic is generated.Based on the waveform superposition theory,the vehicle load time course of a single vehicle is combined according to the time series of the mixed vehicle traffic,and the vehicle load spectrum of the random mixed traffic is obtained.(4)In this paper,With the aid of ANSYS finite element analysis software,a simplified finite element model is established,modal analysis is carried out,and the first10 order modes.The vehicle load spectrum of the random mixed traffic is loaded on the structure in the form,the maximum displacement of the floating plate and the frame structure is obtained.