Applied Mechanics and Materials Vols. 226-228

Abstract: A greedy search based heuristic algorithm was proposed to solve the problem of connecting suburban rail line to existing urban mass transit network, aiming to provide efficient trips for passengers from satellite towns within metropolises to urban area. Optimum connection scheme set was sorted out from the perspectives respectively regarding optimization searching process and different transfer coefficients that reveal the predominance of transfer in path length. And at the same time, the searching process can also assure as short rail line and few connection stations be built as possible when adding more connection stations. High quality of connection design schemes can be ensured by these optional designs, which can also cover various connection modes of different station spacing, providing solid basis for evaluation and selection in future stage. Finally, the aforementioned algorithm was implemented in an example, generating an optimized connection scheme set, which proves the applicability of this algorithm in large scale rail network connection problem.

Abstract: This study is an attempt to optimize the timetable synchronously for regional public transit. Based on the re-interpretation of transfer time in public transportation, a transfer model of bus timetabling is established, which has the objective to minimize the total waiting time of transfer passengers at the transfer station, and it is found as a linear integer model through analysing the established model. Thus, to solve the model, the LINGO software is applied and the corresponding program is designed. Finally, the model is tested against the field data, taking some bus lines in one city as example, using the solution software. The results indicate that the proposed model is reasonable, the timetable is improved, and the solution software program is effective as well.

Abstract: In order to prevent traffic accidents caused by bad speed snow day weather and achieve the purpose of protection of highway traffic safety. Through the analysis of ice conditions, we identified of the rate-limiting model in the snow, snow, snow icing conditions and curve sections, we applied to the model and the calculation of mathematical solution and come to the conclusion of the speed limit which is recommended values at the days of snow and ice disaster conditions. In the practical application, it is convenient to get the speed limit under the necessary conditions through look-up the table of this article in order to ensure the safety of traffic on the road.

Abstract: In order to assess the traffic safety in snow and freezing weather accurately, determined the difference of vehicle lateral displacement of snow freezing and normal weather conditionsthe as the indicator, vehicle model, road model and vehicle-road coupling model were set up by using software ADAMS/Car. By changing road friction cofficient, road conditions in snow and freezing weather were simulated, step steering were carried out, vehicle lateral displacement of different speed and steering angle were obtained, the difference of vehicle lateral displacement of different speed and steering angle under snow and freezing weather and normal weather conditions were calculated, then the curve of difference of vehicle lateral displacement were generated, traffic safety level division of road under snow and freezing weather were researched based on these curves.

Abstract: According to the relative position between before-after vehicles or vehicles and obstacles after braking, a separate vehicle risk in different traffic flow states is divided into four levels. To discriminate real-time traffic status on road sections , the concept of critical density is brought in and the risk of four ranks corresponding to the critical speed are anti-calculated in free driving state and car-following state. By comparing critical speed with the average speed on road section, separate vehicle risk is converted into real-time risk of group vehicles, and real-time risk assessment model of highway traffic in rain and fog weather is established. Simulation results show that the low-density traffic flow will bring lager risk than high-density traffic flow in rain and fog etc disastrous weather; To reduce traffic risk of road section, effective measures are speed limit in low-density flow, speed limit in combination with shunt in high-density flow

Abstract: Compared with conventional airborne remote sensing application to engineering geological investigation, High precision Unmanned Aerial Vehicle Remote Sensing (UAV-RS) technology can improve work condition with advantages of high flexibility, low cost, high efficiency and up-to-date situation acquisition. Especially, it has very important engineering significance for quick and urgent geological disaster reconnaissance along transportation lines. In the paper, some aspects of application to transportation-line (pipeline, highway and railway) engineering geological investigation were discussed. The concerned key points, including components of UAV-RS system, data processing workflow and image interpretation were analyzed. As a case study, a UAV-RS application project for transportation-line geological disaster investigation was given. The utilization of this new remote sensing technology successfully collected and discovered potential geological disasters and provided scientific data for timely decision-making.

Abstract: This paper introduces the present our country freeway generally adopts a closed toll collection mode, and on the adoption of OD matrix estimation algorithm are explained and put forward the feasibility of estimation and correction. By analyzing of the integrity, reliability features of the network weight charge data, the paper discusses networking account weight fees data in-depth mining and development can make it a greater role in the freeway construction management and operation of the maintenance. The use of traffic simulation system combines the data of freeway weight fees, fee information and section traffic information to optimize the selection and provide a more solid basis for decision making on the overall freeway management and control programs. Full text of more comprehensive analysis and expounds the networking weight fees data in freeway construction and management application field, data analysis methods and application of technology route.

Abstract: This paper focuses on the development of load-dependent hysteresis model for Giant magnetostrictive materials (GMM). GMM are a class of smart materials and which are used mostly as actuators for active vibration control. Magnetostrictive actuators can deliver high ouput forces and relatively high displacements. Here, Terfenol-D, a magnetostrictive material is studied. Unlike the hysteresis seen in magnetic materials, The shape of Terfenol-D hysteresis curve changes significantly if the load is changed. To meet performance requirements for active vibration control, an accurate hysteresis model is needed. By modeling the Gibbs energy for each dipole and the equilibrium states, load-dependent hysteresis of GMM is modeled. Then a new PSO-LSM algorithm is brought forward by combing the Particle Swarm Optimization (PSO) with the least square method (LSM).Throughout this algorithm the model parameters were identified. The model results and experimental data were compared at different loads. The simulation results show that the load-dependent hysteresis model optimized by PSO-LSM yields outstanding performance and perfect accuracy.

Abstract: In recent years, there were plenty of construction wastes coming with the expanding of urban built-up areas and the progress of urban redevelopment. Consequently, how to renew and recycle the construction wastes becomes more and more important. Aiming at the causes and characteristics of various construction wastes, this paper advocates that landscape design may be used to solve this problem. Based on the current development about some treatments for the construction wastes in the world, it presents an effective recycling approach by using the wastes as landscape materials to re-discover the construction wastes’ values in environment, economy and society. Furthermore, four principles for this kind of recycling in the whole design process should be followed well, i.e. hommization, functionality, aesthetic and innovation. This paper also provides the direct and circular design methods, and illustrates the detailed practices, in order to offer new thinking for the materials application of landscape design.

Abstract: Surrealism was the twentieth century’s longest lasting art movement in the arts. It explored the mysterious dream world of the unconscious mind. Surrealist works depict a familiar yet alien world of dreamlike serenity and nightmarish fantasy, and their legacy pervades much of contemporary art, literature, film and popular culture. As a representation of irrational aesthetics in the modern art trends, it is worthwhile to study the influence and construction of Surrealism in modern landscape architecture. This paper explores the modern landscape form under the influence of Surrealism Art by analyzing and investigating the intrinsic relationship between Surrealist Art and the modern landscape architecture. Besides that, this paper described the connection between surreal spirit and Chinese landscape architecture design term metaphor of “presence”.