Research On Dynamic Performance And Optimization Of Low-floor Tram In Mountainous City

In recent years,with the rapid development of China’s economy,people’s living standards have improved significantly,which leads to the continuous promotion of urbanization,but also leads to the excessive use of resources,which leads to the aggravation of environmental pollution.The rapid increase of urban population makes the existing means of transport difficult to meet the travel needs of the public,which promotes the rapid development of urban rail transit transportation system,and the means of transport are gradually diversified.As one of the transportation systems of modern urban rail transit,modern tram is gradually favored by major cities because of its advantages of energy conservation and environmental protection,comfortable ride,convenient for passengers to get on and off,large traffic volume and low construction cost.Nanbin road in Chongqing is planned to adopt the tram system.According to the unique geographical conditions such as small radius curve,large slope and so on,this paper puts forward the tram scheme with strong applicability in the mountainous city based on the current tram,and studies its dynamic performance.The main research work is as follows:1.On the basis of the existing trams at home and abroad,this paper selects a form of trams suitable for the road characteristics of mountain cities,and introduces the structure composition,bogie type and articulated device between vehicle bodies of the trams,as well as the guiding mechanism of transverse coupling independent wheels;2.According to the vehicle structure and main technical parameters,the reasonable simplification and equivalent principle of its structure are carried out,the topological relationship model of the mountain city tram is established,and the dynamic simulation analysis model of the tram is established in the multi-body system dynamics software SIMPACK,which provides a certain basis for the subsequent dynamic simulation analysis;3.With reference to the establishment method of relevant dynamic evaluation indexes and combined with the structural characteristics of the tram,the dynamic performance evaluation indexes conforming to the modern tram are selected reasonably,and the straight-line operation stability,stability and curve passing performance of the simulation model are simulated and analyzed under the no-load and full load conditions;4.The sensitivity analysis method is used to analyze the curve passing performance of the low floor tram in mountainous cities,and the parameters that have significant influence on the curve passing performance of the tram are selected.The sensitivity analysis function of multi-objective optimization software i SIGHT is used to verify the analysis results;5.Through the method of combination of multi-objective optimization software i Sight and multi-body dynamics analysis software SIMPACK,multi-objective parameter optimization is carried out for the curve trafficability of trams in mountainous cities.The objective function is the derailment coefficient and vehicle body side angle of trams to obtain the optimal matching parameters and verify the effectiveness and feasibility of the optimization results.