Applied Mechanics and Materials Vols. 505-506

Abstract: To investigate the real emission level of compressed natural gas (CNG)/gasoline dual-fuel taxis, Portable emission measurement system (PEMS) testing techniques was applied to measure instantaneous CO₂, CO, NO_x and HC emissions. Comparison between CNG and gasoline was set up to analyze the influence of speed and driving modes on the gas pollutants emissions under the real-world operating conditions. Results show that the average speed of the tested taxis is 27.75 km/h and the speed has a relationship with emission level. Taxi fueled with CNG emit less CO₂ and CO but more NO_x and HC than taxi fueled with gasoline at all speeds below 45 km/h. CO₂, CO and HC emission factor from CNG taxi were lower whilst NO_x were higher, NO_x emission rate of CNG taxi was higher contrast to the taxi with gasoline. The emission level of CNG taxi is better than gasoline taxi when the driving speed is low.

Abstract: This method is explained and demonstrated how to calculate obstacle limit takeoff weight. According regulation requirement, under an engine failure conditions, it needs to consider the takeoff flight path different segments which can clear all obstacles ^[. In this paper, take-off gross flight path and net flight path are analyzed, and taking an aircraft for example, obstacle limit takeoff weight are calculated, Simulation results show the feasibility of optimization algorithm.

Abstract: The aim of this paper is to analyze limitations of the sight conditions from the vehicle, which is caused by construction parameters of the vehicle. It deals with front pillars, its influence on sight conditions and evaluation of sight width according to the active car safety. The first part deals with passive and active safety of vehicles. Next part is the choice of the most common vehicle in The Czech Republic and defining its parameters. Using a mathematical derivation were detected angular values of the sight. The resulting values were then evaluated and analyzed.

Abstract: The paper studied B-pillar crashworthiness in the car side impact by modifying CAD model of a domestic car. MDB is builded according to ECER95 regulation and a car side impact model is established finally. And the paper made simulation analysis and solve for the model based on HyperMesh and LS-DYNA. According to simulation analysis, focusing on the insufficient crashworthiness of B-Pillar two schemes were put forward: one was to change the B-pillar thickness; The other was to change the B-pillar materials.The results show that simply increase thickness is not feasible and changing the steel to aluminum alloy is feasible which greatly improved crashworthiness.

Abstract: Overloading the impact on traffic safety, measuring the deformation of leaf spring form the start, a vehicle load measuring system was designed based on ultrasonic sensors. In this article, the mathematics model of steel plate deformation and load is discussed upon the mechanics principle and obtain the relationship of load and deformation. Processing the data that the ultrasonic sensors measured by single-chip and using temperature sensor to compensate, it comes to the result of vehicle load.According to the test, the system achieved the purpose of real time measurement of vehicle load, and it is useful.

Abstract: The traditional aluminum piston, the can not meet the engine development to the high power density direction, so the higher strength steel piston designed. The temperature filed and deformation was calculated and analyzed by finite element method with finite element software MSC.NASTRAN. The results can provide theoretical foundation for the promotion of the all-steel piston.

Abstract: It starts at co-operation problem between different transportation enterprises, and sets up the Coordination Transportation concept with its management and administration model based on geography information system technology. Then it analyses and points out that its solution to shortest path may have the aid of intellect algorithm. Finally it studies and analyses the measurements during Coordination Transportation between deferent transportation enterprises. Coordination Transportation will help improve the style of transportation, and it will also help set up comprehensive transportation system in China.

Abstract: To decrease the logistics cost effectively, this paper will fulfill the goal by materials supply plan management. The first step is the classifying of materials; it will find the key materials out to improve the efficiency and effectiveness of material management. Then its the material supply plan management of the key materials based on material requirement plan of railway construction.

Abstract: The High Energy Consumption of the Current Urban Rail Transit Industry, High Efficiency Energy Saving Measures must be Taken. this Paper Entity from the Traction Energy Consumption, Building Structure and Operating Equipment Aspects of the Current Situation, Described the Energy Saving Strategies. Aiming at the Present Problems Existing in Energy Saving Practice, this Article Puts Forward the Comprehensive Energy Saving System which Contains Optimization Design in Planning Period, Low Resource Consumption in Construction Period, Energy Saving Work in Operation Period. above all, Implement Energy Saving Practice at Every Concrete Work of Reaching.

Abstract: The civil communication system in urban rail transit network is the one which can provide the passenger value-added service. It can meet underground needs of information service for passengers, and be the alternate means of communication for drivers, equipment maintenance personnel, the stations duty officers, and so on. When the wireless systems for rail transit comes malfunction, the civil communication system can provides smooth information channel for rail transit participants to ensure the safety of personnel and rail transit dispatching.