Zhang W.,Highway Bureau of Shanxi Province |
He X.,Chang'an University
Advanced Materials Research | Year: 2014
The correlation and Hausdroff dimensions of traffic flow and speed series are analyzed based on the Fractal theory. Using the traffic flow data of four typical expressways in China as input sample, the data statistical results indicates that both synchronized and free flow state are fractal and chaotic. In addition, traffic flow rate and speed time series are determined by different intervals and then G-P arithmetic is applied to estimate their correlation dimensions and the Hausdroff dimension. The results also illustrates that Fractal dimension could by clearly identified, which provides a useful tool for expressway operation management and facilities provision. © (2014) Trans Tech Publications, Switzerland.
Guo D.-H.,Chinese Research Institute of Highway |
Ma D.-W.,Highway Bureau of Shanxi Province |
Zhang Z.-Y.,Chinese Research Institute of Highway |
Ma X.-F.,Chinese Research Institute of Highway
Advanced Materials Research | Year: 2012
This paper explains the economy and mechanical properties of the ferritic stainless steel used as the materials of the traffic sign substrate plate, analyzes the relationship between the density of the ferritic stainless steel and the thickness of the substrate plate, proposes a method to determine the quality of the welding, and describes the corrosion mechanism and processing performance of the ferritic stainless steel substrate plate while proposing the related improving ways. The results showed that: by reducing the thickness, ensuring the overall load, adopting the tempering control to reduce the contents of the C, N and other impurities, adding the alloy elements such as the Cr, Mo, Ti, Nb to lower the corrosion, and reducing the C, N, S, P, O and other impurity elements to improve the welding performance, the ferritic stainless steel can be a good material for the traffic sign substrate plate. © (2012) Trans Tech Publications.