针对公路桥梁车辆荷载概率统计中出现的多峰分布问题,引入赤池信息判别准则(Akaike Information Criterion,AIC)和贝叶斯信息判别准则(Bayesian Information Criterion,BIC),提出了一种高斯混合建模方法(Gaussian Mixture Model,GMM);...针对公路桥梁车辆荷载概率统计中出现的多峰分布问题,引入赤池信息判别准则(Akaike Information Criterion,AIC)和贝叶斯信息判别准则(Bayesian Information Criterion,BIC),提出了一种高斯混合建模方法(Gaussian Mixture Model,GMM);结合车辆动态称重数据,依据等效疲劳原则,建立了宜泸高速等效疲劳车辆荷载模型。在此基础上,采用Miner疲劳线性累积准则对某简支梁桥进行了疲劳寿命评估。研究结果表明:该高斯建模方法能够精确地描述车辆荷载概率密度分布同时兼顾简洁性;模型加权分量数分别与拟合精度、模型的简洁性呈正相关、负相关;单峰荷载模型作用下桥梁的疲劳寿命(82.0年)小于高精度多峰荷载模型的计算值(89.6年),优化多峰荷载模型与高精度荷载模型作用下,桥梁的疲劳寿命发展曲线吻合较好,误差仅为1.5%;考虑交通增长率为5%时,在优化高斯混合车辆模型作用下,宜泸高速某简支梁桥的疲劳寿命值为89.6年。展开更多
A trajectory generator based on vehicle kinematics model was presented and an integrated navigation simulation system was designed.Considering that the tight relation between vehicle motion and topography,a new trajec...A trajectory generator based on vehicle kinematics model was presented and an integrated navigation simulation system was designed.Considering that the tight relation between vehicle motion and topography,a new trajectory generator for vehicle was proposed for more actual simulation.Firstly,a vehicle kinematics model was built based on conversion of attitude vector in different coordinate systems.Then,the principle of common trajectory generators was analyzed.Besides,combining the vehicle kinematics model with the principle of dead reckoning,a new vehicle trajectory generator was presented,which can provide process parameters of carrier anytime and achieve simulation of typical actions of running vehicle.Moreover,IMU(inertial measurement unit) elements were simulated,including accelerometer and gyroscope.After setting up the simulation conditions,the integrated navigation simulation system was verified by final performance test.The result proves the validity and flexibility of this design.展开更多
文摘针对公路桥梁车辆荷载概率统计中出现的多峰分布问题,引入赤池信息判别准则(Akaike Information Criterion,AIC)和贝叶斯信息判别准则(Bayesian Information Criterion,BIC),提出了一种高斯混合建模方法(Gaussian Mixture Model,GMM);结合车辆动态称重数据,依据等效疲劳原则,建立了宜泸高速等效疲劳车辆荷载模型。在此基础上,采用Miner疲劳线性累积准则对某简支梁桥进行了疲劳寿命评估。研究结果表明:该高斯建模方法能够精确地描述车辆荷载概率密度分布同时兼顾简洁性;模型加权分量数分别与拟合精度、模型的简洁性呈正相关、负相关;单峰荷载模型作用下桥梁的疲劳寿命(82.0年)小于高精度多峰荷载模型的计算值(89.6年),优化多峰荷载模型与高精度荷载模型作用下,桥梁的疲劳寿命发展曲线吻合较好,误差仅为1.5%;考虑交通增长率为5%时,在优化高斯混合车辆模型作用下,宜泸高速某简支梁桥的疲劳寿命值为89.6年。
基金Projects(90820302, 60805027, 61175064) supported by the National Natural Science Foundation of ChinaProject(2011ssxt231) supported by the Master Degree Thesis Innovation Project Foundation of Central South University, China+1 种基金Project(200805330005) supported by the Research Fund for the Doctoral Program of Higher Education, ChinaProject(2011FJ4043) supported by the Academician Foundation of Hunan Province, China
文摘A trajectory generator based on vehicle kinematics model was presented and an integrated navigation simulation system was designed.Considering that the tight relation between vehicle motion and topography,a new trajectory generator for vehicle was proposed for more actual simulation.Firstly,a vehicle kinematics model was built based on conversion of attitude vector in different coordinate systems.Then,the principle of common trajectory generators was analyzed.Besides,combining the vehicle kinematics model with the principle of dead reckoning,a new vehicle trajectory generator was presented,which can provide process parameters of carrier anytime and achieve simulation of typical actions of running vehicle.Moreover,IMU(inertial measurement unit) elements were simulated,including accelerometer and gyroscope.After setting up the simulation conditions,the integrated navigation simulation system was verified by final performance test.The result proves the validity and flexibility of this design.
