Advanced Materials Research Vols. 779-780

Abstract: The paper has an analysis of ship electrical propulsion technology. The Paper have a detail research of IPS (Integrate Propulsion System) . A mathematics model in the form of differential equation was constructed base on the theory of motor timing. Then the model was changed into the form of transfer function. With the help of MATLAB, the model in the form of transfer function can be easily solved.

Abstract: To establish a learning and communication platform of design problem and solutions among designers for eliminating repetitive design errors become an important and urgent task. The analysis report on typical design case is a technical management method, which is a reliable and effective way to solve the problem mentioned above. This article expounds the implementation of the analysis report on typical design case and makes the suggestion on future design case study.

Abstract: According to requirement of operation safety and comfort of airplane on the asphalt pavement of airport, the cause incurring unevenness is discussed subject to aspects of inherent unevenness of pavement, unsatisfied construction equipment and process, repeated action of airplane load during utilization process, and long term action of natural factors, etc; aiming at the requirement on how to improve the airport construction quality and guarantee asphalt pavement roughness, and on the basis of engineering examples of bad roughness of asphalt runway, the roughness impact factors are discussed by three aspects as uneven settling of earth foundation, unstable base course, relaxed construction control of topping asphalt mixture, etc , so as to take control measures with pertinence at each stage of airport construction, to guarantee the excellent roughness of asphalt pavement.

Abstract: Accurate measurement and modeling of fuel consumption have great significance in the evaluation and optimization for environmental protection, energy saving and economy of highway project. Vehicle, test method and fuel consumption prediction method are improved for accurate calculation of current fuel consumption. Natural drivings fuel consumption are measured with actual transportation vehicles on the highway. Long route is divided into many units, whose fuel consumption are added to estimate the total fuel consumption. Comparison between traditional models calculating value and measured value on flat road shows that traditional models are not suitable for calculating current fuel consumption. So traditional models coefficients are updated and new model forms are established through a large number of measured data. The new models are more accurate than traditional models.

Abstract: A better understanding of the adsorption behaviors of hydrocarbons on adsorbent would help trap the hydrocarbons emitted from diesel engines during cold start period more efficiently. In this paper, the adsorption behaviors of hydrocarbons in LTA zeolite was studied using Grand Canonical Monte Carlo (GCMC) simulation. The adsorption isotherms and mass clouds are obtained for both pure component and binary mixtures under certain temperatures. The adsorption isotherms reveal that the average loading of ethylene and propylene has the similar trend. Both of them increase with the increase of pressure and decrease significantly with the increase of temperature. The binary mixtures show competitive adsorption behavior. Propylene is adsorbed much more strongly than ethylene in LTA zeolite. The obtained mass clouds show that propylene distributes in both the α cage and β cage of the LTA zeolite, while ethylene distributes mainly in the β cage of the LTA zeolite.

Abstract: Detecting abnormal events such as crash is a practical problem that is important to Intelligent Transportation System. By taking advantage of the data recorded by the remote sensors which are deployed along the road, we can perform data mining techniques to see whether there are abnormal events happening on the road. This paper aims at proposing an abnormal-events-detecting method based on the traffic data, which first utilizes outlier detection to generate a fuzzy result set from source data, and then through the time series mining techniques to filter that to obtain an accurate experimental one. Experiment with real-world data shows that our method works satisfactorily in detecting abnormalities such crash, stall and hazard on the road.

Abstract: In order to realize continuous detection of rail short wavelength irregularities and improve its restoration precision, an algorithm based on digital inverse filter technology is derived and presented. The inverse filter has been realized by means of Finite Impulse Response (FIR) digital filter. It has a complete linear phase characteristic which ensures no distortions of the restored waveform. Realization of the restoration algorithm is also based on Fast Fourier Transform (FFT) to make the restoration process effectively and efficiently. Finally the restored waveforms were compared with the results from RMF-2.3E devices and thus the restoration precision can be achieved. Results show higher restoration precision and reliability when compared to the traditional one of Mid-chord method. It means the restoration accuracy can be significantly improved by using digital inverse filter.

Abstract: For the existing railway, the settlement after construction caused by the tunnel underneath it is completed after the tunnel has been constructed. It is the result that the stress adjustment and consolidation of soil enhanced itself under the live load of train. Through the settlement can be calculated by peck formula in the stage of and after construction, for the settlement after construction, the peck formula must be transformed with the fitting monitoring curve. With the engineering example, the fitting formula of settlement after construction can be used for analysis and prediction of similar engineering.

Abstract: On the basis of the engineering background of cross passage construction in the Chen Yu Tunnel project, the collapse section above the intersection of the existing tunnel is selected to establish finite element model. Considering the effect of cross passage construction and the local weakening area of surrounding rock on the safety of existing tunnel structure, the strength of the shotcrete supporting structure of existing tunnel intersection is checked, and the security of the existing tunnel is evaluated. This research is of great practical significance and a certain reference value for the plan and design upon the construction of tunnel engineering.

Abstract: This paper conducts an in-depth research on applications reliability in highway network planning and optimization of construction sequence. It introduces the concept of reliability to the layout of the importance of the road network node and establishes a fairly comprehensive theoretical method of highway network planning based on the reliability from the aspects of the road network layout, evaluation, and construction sequence arrangements. Case study illustrates the proposed layout optimization method has achieved satisfactory results in the road network reliability analysis, displaying strong practical promotional value.