Advanced Materials Research Vols. 779-780

Abstract: From the view of driver’s driving behavior and reaction characteristics, the factors affecting driver’s reaction time are comprehensively analyzed. Then design and prepare driver’s reaction time of emergency braking detection system on both hardware and software by using MCU. And according to the factors affecting driver’s reaction time, the reaction time of emergency braking of different gender drivers in different conditions is tested by using orthogonal test method. From the experimental results, the degree of influence of different factors and different levels on driver’s reaction time is obtained and this provides a reference for safety driving.

Abstract: Because of the special traffic environment, the tunnel is called a bottleneck on the highway sections; there is a huge risk of safe operation. Tunnel interior zone lighting plays an important role in the tunnel; good lighting can eliminate depression and driving fatigue of the driver in the tunnel. In this paper, freeway tunnel interior zone lighting is as the research object. We analyzed the driver's demand for freeway tunnel interior zone lighting and transformed illumination to luminance in the model of driver workload, operating speed and the illumination. And this model is established by our group. According to comfortable and relatively comfortable driving workload intense threshold, we can get the safe and comfortable luminance threshold of tunnel interior zone. This paper proposed a detection and evaluation method in freeway tunnel interior zone luminance, and the method have been applied and verified on one freeway in south China.

Abstract: The driving conditions of commercial trucks are very complex, therefore, the study of trucks longitudinal braking friction coefficient is difficult. Domestic research in this area is still in blank. The factors of light trucks longitudinal braking friction coefficient are researched, with the orthogonal experiment of different factors and levels. From the orthogonal experiment, how many main factors affect the longitudinal braking friction coefficient is acquired. After that, perform the experiment of longitudinal braking friction coefficient under the condition of single factor variable , such as, vehicle speed, load. From the results, variation tendency of every single factor variable is obtained.

Abstract: Variation of driver workload degree on freeway was analyzed in order to research safe and comfort of alignment and provide a new technical support for humanization road design. A total of 12 healthy adult drivers heart rate variability index and operating speed are tested on 77 sections of one mountainous freeway. According to the change law of different drivers workload degree on different alignment conditions,4 sections cant meet the expectations of the truck drivers safe and comfort. In addition, accident data is used to verify the dangerous sections. Research results can be applied to design road alignment that meets the driving expectations of different drivers.

Abstract: Nowadays, speed-change lane of freeway interchange is a big safety risks area. The reasonable length of speed-change lane can effectively reduce the safety risk. From the point of drivers safety and comfort, this paper studies on the length of speed-change lane by doing experiment on drivers driving on behalf of cars and trucks. Through the theoretical and experimental analysis, we study on vehicle speed and variation of driver driving workload, establishing the relationship between length and drivers safety and comfort. Under the conditions of the design speed of 120km/h, the general values and limit values of length which meet the drivers expectation are provided. They are compared with the current specification index in China. This paper puts forward a new idea and method to study on the length design index standard of speed-change lane in freeway trumpet interchange.

Abstract: Through analysis of large sample data of freeway traffic block event, the data source of freeway traffic block is found out and summarized. Based on that, this paper propose a national level, distributed, freeway traffic block multidimensional data warehouse (FTBMDW) , and present the concept model , logical model and physical models of the data warehouse. The purpose of the FTBMDW is to support inter-provincial and inter-regional freeway traffic block analysis with reliable data.

Abstract: By means of ANSYS, piston finite element model is constructed to attain transient numerical simulation and explore the characteristics of surface temperature. On the basis of experimental design, the correlation is analyzed between major boundary conditions and temperature of feature points, thus revealing the corresponding correlation of quantity. Transient calculation method is proved to be scientific and paves way to defining boundary conditions. And furthermore there forms a theoretical foundation for positioning test point in piston temperature field.

Abstract: The paper took the piston of 620 single-cylinder engine as an example,a finite element model of piston was built with the help of ANSYS software. Than to calculate temperature field and and quick cold start conditions respectively^[1]. Through the periodic transient thermal analysis, temperature fluctuations on the surface of the piston were derived, which indicated that the surface contacted with gas was the main temperature fluctuation area. The max temperature fluctuation can be up to 20 ° C and the wild fluctuation occurred in a distance of 2 mm from the surface of the piston. Temperatures of the piston went up according to exponential rule during the course of quick cold start, Extreme temperature fluctuations will generate huge quasi-static thermal stress.

Abstract: The tuning of PID controller parameters is the most important task in PID design process. A new tuning method is presented for PID parameters, based on multi-objective optimization technique and multi-attribute decision making method. Three performances of a PID controller, i.e. the accurate set point tracking, disturbance attenuation and robust stability are studied simultaneously. These specifications are usually competitive and any acceptable solution requires a tradeoff among them. A hybrid approaches is proposed. In the first stage, a Non-dominated Sorting Genetic Algorithm II (NSGA II) is employed to approximate the set of Pareto solution through an evolutionary optimization process. In the subsequent stage, a multi-attribute decision making (MADM) approach is adopted to rank these solutions from best to worst and to determine the best solution in a deterministic environment with a single decision maker. The ranking of Pareto solution is based on entropy weight and TOPSIS method. A turbine PID design example is conducted to illustrate the analysis process in present study. The effectiveness of this universal framework is supported by the simulation results.

Abstract: We try to provide the quality logistics services to customers at the lowest logistics cost,by the model of drop and pull transportation of the entire car. To this end, this paper carried on the economic benefit analysis and comparison from two aspects of the fixed cost and variable cost between the drop and pull transportation and the traditional transportation model for the entire car. Keywords: the Entire Car Transportation, the Drop and Pull Transportation, the Traditional Transportation, the Logistics Cost, the Analysis and Comparison