针对智能交通系统的开发和交通流特性,应用小波多分辨分析理论的M a llat分解算法建立交通流状态辨识方法,利用多种小波系数与交通流参数之间的相应变化规律进行交通突变状态的辨识.交通流状态的突变多与交通事件直接相关,故采用事件和...针对智能交通系统的开发和交通流特性,应用小波多分辨分析理论的M a llat分解算法建立交通流状态辨识方法,利用多种小波系数与交通流参数之间的相应变化规律进行交通突变状态的辨识.交通流状态的突变多与交通事件直接相关,故采用事件和非事件条件下的模拟数据对算法参数进行了标定及离线测试.将算法与几种传统算法分别进行了性能比较,结果表明M a llat分解算法在交通流突变状态实时辨识方面具有很好的性能.展开更多
This paper intends to describe the relationship between traffic parameters by using cusp catastrophe theory and to deduce highway capacity and corresponding speed forecasting value through suitable transformation of c...This paper intends to describe the relationship between traffic parameters by using cusp catastrophe theory and to deduce highway capacity and corresponding speed forecasting value through suitable transformation of catastrophe model. The five properties of a catastrophe system are outlined briefly, and then the data collected on freeways of Zhujiang River Delta, Guangdong province, China are examined to ascertain whether they exhibit qualitative properties and attributes of the catastrophe model. The forecasting value of speed and capacity for freeway segments are given based on the catastrophe model. Furthermore, speed-flow curve on freeway is drawn by plotting out congested and uncongested traffic flow and the capacity value for the same freeway segment is also obtained from speed-flow curve to test the feasibility of the application of cusp catastrophe theory in traffic flow analysis. The calculating results of catastrophe model coincide with those of traditional traffic flow models regressed from field observed data, which indicates that the deficiency of traditional analysis of relationship between speed, flow and occupancy in two-dimension can be compensated by analysis of the relationship among speed, flow and occupancy based on catastrophe model in three-dimension. Finally, the prospects and problems of its application in traffic flow research in China are discussed.展开更多
文摘针对智能交通系统的开发和交通流特性,应用小波多分辨分析理论的M a llat分解算法建立交通流状态辨识方法,利用多种小波系数与交通流参数之间的相应变化规律进行交通突变状态的辨识.交通流状态的突变多与交通事件直接相关,故采用事件和非事件条件下的模拟数据对算法参数进行了标定及离线测试.将算法与几种传统算法分别进行了性能比较,结果表明M a llat分解算法在交通流突变状态实时辨识方面具有很好的性能.
文摘This paper intends to describe the relationship between traffic parameters by using cusp catastrophe theory and to deduce highway capacity and corresponding speed forecasting value through suitable transformation of catastrophe model. The five properties of a catastrophe system are outlined briefly, and then the data collected on freeways of Zhujiang River Delta, Guangdong province, China are examined to ascertain whether they exhibit qualitative properties and attributes of the catastrophe model. The forecasting value of speed and capacity for freeway segments are given based on the catastrophe model. Furthermore, speed-flow curve on freeway is drawn by plotting out congested and uncongested traffic flow and the capacity value for the same freeway segment is also obtained from speed-flow curve to test the feasibility of the application of cusp catastrophe theory in traffic flow analysis. The calculating results of catastrophe model coincide with those of traditional traffic flow models regressed from field observed data, which indicates that the deficiency of traditional analysis of relationship between speed, flow and occupancy in two-dimension can be compensated by analysis of the relationship among speed, flow and occupancy based on catastrophe model in three-dimension. Finally, the prospects and problems of its application in traffic flow research in China are discussed.
