Applied Mechanics and Materials Vols. 97-98

Abstract: Lead concentration of pond sediments near the road, as well as pond sediments far away from roads in a rural area in Sixian County, northern Anhui Province, China, have been analyzed, and the spatial distribution of lead and the index of geo-accumulation have been brought to light. The results indicate that the lead concentrations of pond sediments near the road range from 20 to 34 mg/kg with average= 26.7 mg/kg, whereas pond sediments far away from the road have lower lead concentrations from 20 to 21 mg/kg with average= 20.8 mg/kg. The lead concentration from high to low is Xinji, Gonggou, Dazhuang, Huangwei, Yangzhuang and area far away from the road. A similarity between spatial distributions of lead concentration, index of geo-accumulation (Igeo) and towns (including village and the roads between them) indicates that motor vehicles play important role in controlling the distribution of lead in rural areas.

Abstract: In the framework "one city, four park" of Weifang BEDA, an idea to construct an 80-km seaport logistics park has been under discussion, which will bring opportunities to develop seaport logistics. The purpose of this study is to analyze the strength, weakness, opportunity and threat in developing seaport logistics in Weifang Binhai Economic-technological Development Area by using SWOT analysis method, and also some policies and suggestions has been given in this article.

Abstract: Road transportation accidents of dangerous goods occur frequently. These accidents destroy and pollute the environment seriously, cause huge economic loses and endanger the safety of people's lives and property. 233 cases of road transportation accidents of dangerous goods which occurred during January 2008 to December 2010 were collected in this paper, accompanied by classified statistics and detailed analysis, three countermeasures have been proposed: strengthening the transport of dangerous goods management under severe weather, focusing on the daily inspection and control, implementing accident prevention measures in important region and roads. The study of this paper has important practical significance on researching how to prevent the occurrence of such accidents.

Abstract: Drop and pull Transport is an economic, environmental protection, a high efficient mode of transportation. It has already been widely used in production practice in developed western countries. But the development of it in our country has been limped. The paper analysis from three aspects: Fixed costs, variable costs, the total cost of economic benefit. Also, this paper looks into the Fuel and carbon dioxide emissions from the social benefit. Thereby obtain energy saving and emission reduction. drop and pull Transport has raise transportation economic efficiency and social efficiency advantage.

Abstract: Presently the electric power harvested from vibration energy by existing researches is mostly at the level of μW or mW, which is not available for structural vibration energy harvesting due to the characteristics of lower frequency, bigger mass, and higher Vibration Energy. Therefore, a novel vibration energy harvesting method via pulse liquid flow for structural vibration is put forward. The principle of the method is mainly depicted as follows: the pulse liquid flow motivated by external vibration twirls the hydraulic motor’s output shaft; then electric power is produced by the generator rotor due to the shaft torque. In this paper, the Energy Harvesting Model has been built with the help of the fluid mechanics principle and the electromagnetic induction principle. In addition, the formula for output voltage was derived and, meanwhile, the influence of the piston’s moving speed amplitude on output voltage has been analyzed as well. Ultimately, we have designed an experimental setup in order to verify the rationality of the analytical method. In our experiments, sinusoidal mechanical excitation was used to test the Energy Harvesting characteristics by the J95-I absorber testing platform. According to the results, the waveform of output line voltage is in a good agreement with the theoretical analysis, which shows effectiveness of this novel method and the worth of which to help solve the problem of dependable power supply for current semi-active vibration control systems.

Abstract: The direct torque control (DTC) for permanent magnet synchronous motor (PMSM) possesses many advantages: simple control configuration, lesser parameters dependence and fast dynamic response. And it can be used as motor drive for electrical vehicle (EV). In this paper the DTC for PMSM is investigated. Experimental results of an interior PMSM used in Honda Civic 06 MY hybrid electrical vehicle are given. Experimental results show the interior PMSM DTC drive is an ideal solution for electrical vehicle propulsion system.

Abstract: In the present work, the CFD software FLUENT is used to calculate the ship resistance and simulate the flow field around it. Comparison of the numerical results with experimental data of the ship without interceptor shows basically satisfactory agreement in the case of high-speed. In order to get the right parameters of the interceptor for the ship, some two dimensional calculation is taken to study the influence of interceptor with different size. The simulation of the three dimensional vessel with interceptor is also included, and the effect is discussed.

Abstract: The DTC for PMSM possesses many advantages: simple control configuration, lesser parameters dependence and fast dynamic response and is a good choice for the drive of EV. But the DTC suffers from high torque ripples. The switching table is used as the hysteresis control rule that determines the control performance. An improved switching table is proposed based on effects of voltage vectors on the drive. Simulation results show this switching table can suppress torque ripple compared to the conventional switching table.

Abstract: Biological enzyme used for catalyzing reaction of soil is a new material which is completely different from traditional highway material. The solidification mechanism, construction technique and maintenance technique of TerraZyme solidifying the base course of pavement have been discussed and with respect to which the field tests have been studied in this paper. The analysis and test results showed that the advantages of the technique of TerraZyme solidification are no pollution, convenient construction, high strength of solidification, good water stability and low cost. Thus, it has significant social and economic benefits and bright future in practice.

Abstract: Aiming at the shortcomings of present researches on the energy-saving and emission-reduction effect of BRT, the paper first gets actual operating data of BRT, conventional bus and car of Jinan by survey. Then, based on actual survey data and synthesis emission factor, the paper analyzes the energy-saving and emission-reduction effect of Jinan BRT. The results demonstrate: compared with conventional bus and car, the energy-saving and emission-reduction effect of BRT is very remarkable.