The Simulation Study Coupled Vibration Between Vehicle And Bridge Based On SIMPACK Software

With the era development and the continuous improvement of train speed,and construction of various types bridges, especially for some standardization beam and curved girder. Study found that as the speed increases, coupled vibration between vehicle and bridge the dynamic response is becoming more and more big, when the vehicle through the curved girder bridge dynamic response is more complex,the coupling simulation of the bridge vehicle-bridge request.With the railway speed and a lot of the standardization bridge to build, the simulation study coupled vibration between vehicle and bridge is also more and more towards the development of complex and specific. Using professional multi-body system dynamics software, more specific and modular programming modeling and simulation. Using multi-body system dynamics software SIMPACK vehicle model is established, using the finite element software ANSYS to establish a bridge model, the bridge section is a hollow box section by using solid element Solid185, the second phase dead load evenly distributed in the deck. The bridge model with FEMBS interface imported into the SIMPACK, discrete information by Wheel/Rail contact surface contact point to complete two subsystems data exchange to achieve joint simulation.This paper first introduces the multi-body system dynamics theory,describes how the progress of the system dynamics and the research methods, introduces the software from modeling to solve the process. Some common methods of modeling coordinate system, also introduces how to realize the modeling of vehicle in the system dynamics, and the formation of the component modeling and implementation of the module.Again according to the coupled vehicle bridge problem, introduces in detail how to realize the joint between two pieces of software simulation, given the railway spectrum of the United States, Germany and China, doing irregularity spectrum with German railway spectrum of high irregularity and low irregularity. The parameters and modeling process of train and bridge model is given,also introduces how to realize the exchange of information through the two parts of Wheel/Rail, finally realizes the coupling. At the same time, given the simulation study coupled vibration between vehicle and bridge response evaluation criteria.Finally the simulation through two types of bridge-simply supported girder bridge and curved girder bridge, the parameters of the extraction need, and then to do further research in the finite element.Calculate the natural vibration frequency of bridge, pretreatment equilibrium test for vehicle bridge system. Then applied the German railway spectrum of high irregularity and low irregularity, the train from 125km/h to 350km/h were calculated,andstudied the different track spectrum,the effects of different bridge damping ratio and curve radius on the bridge and vehicle, summary of the various factors of the vehicle bridge vibration response characteristics, and draw some meaningful conclusions.Comfort of the vehicle?acceleration?derailment coefficient and the ratio of load are presented as the speed increases.Vehicle acceleration is very sensitive to longer wavelengths track spectrum,the wheel weight ratio of load sensitive to relatively short wavelength spectrum;Bridge dynamic displacement and acceleration are relatively close in two kinds of spectrum value,two kinds of track spectrum on the bridge dynamic response is not very obvious; With the increase of damping ratio dynamic displacement decreases, under the same damping ratio, dynamic displacement increases with speed; Also found that the faster the speed damping ratio are more sensitive.Found on the curved girder vehicle inside the wheel/rail lateral force is greater than the lateral; When the speed of 350 km/h, wheel load lightening rate exceeds the safety limit,Bridges across the lateral acceleration is greater than the limit, does not meet the specification requirements;At the same time train various indicators and curve with the increase of outside rail ultra-high become larger with the decrease of the radius,Bridge's dynamic vibration effect is larger;...