Numerical analysis of noise radiation from motorcycle engine shell

FEM/BEM (Finite Element Method/Boundary Element Method) mode analysis of the noise radiation from motorcycle engine shell is conducted. The natural frequency is compared between FEM/BEM analysis and experimental analysis. The FEM/BEM results are agreed with the experiment results, which proves that the finite element model is correct. The frequency response is analyzed and the structure’s noise radiation is simulated by means of FEM/BEM, in order to predict the noise radiation from the motorcycle engine shell and gain the sound field characteristic outside the structure. The calculation data is compared with the experiment data in different frequency bands. The result shows high accordance, which indicates that this method is effective.     

Simplifying and validating the model of wet flue gas desulphurization spray tower for 660MW units

The wet limestone gypsum flue gas desulphurization system for 660 MW units of a thermal power plant is taken as the object, based on the study of the mass transfer between the gas phase and the liquid phase、chemical reaction mechanism in desulphurization tower and reasonable simplified hypothesis, the turbulent mathematical model of the spray type tower is developed by the methods of concentration of parameters and module modeling. The model is validated by the test of stable state and the turbulent experiments, which can be used as the basis for developing the real training simulation model of the desulphurization system.     

Maximum tree method based aspect mining method

By means of discovering crosscutting concerns from legacy systems, aspect mining intends to help migrate the systems to an aspect oriented design. An improved method based on maximum tree method for aspect mining is presented. The method uses aspect ideas to capture the runtime method call information by mining crosscutting concerns from dynamic behaviors, and then constructs a method call relationship data matrix. Based on fuzzy similarity relation theory, by introducing the similarity, an object similarity matrix is constructed, and the maximum tree method is used to identify the crosscutting concerns in the system. The method can provide a basis for system’s software reconstruction and reusability. An experiment is conducted to verify the validity of the method. Compared with the existing typical mining methods, the method shows the virtue of clear implementation and high efficiency.     

The Effect of Slabs on the Failure Mode of Reinforced Concrete Frame Structures

A majority of reinforced concrete frame structure failure patterns resulting from the May 12, 2008 earthquake in Wenchuan County, P. R. China were analyzed. It was found that the main failure mode of frame works was “strong beam, weak column”, which conflicts with the design criteria of “strong column, weak beam”. The cause of this failure pattern was analyzed. A new concept is put forward that should be considered in design work. The over strength caused by slabs connected monolithically to the beams is analyzed. The joint types, transverse beam stiffness and lateral drift influence the reinforcing effect of the sla, Moreover, a reinforced concrete frame model was simulated using the program ABAQUS. The slab reinforcement stress distributions at different lateral drifts were analyzed and the effective flange width value proposed.     

Impact Analysis on Design Parameters about Service Behavior ofCantilever Anti slide Piles

Directing toward the flow design of cantilever anti slide piles, the thesis which is based on foundation coefficient method and finite element method mainly analyzes service behavior influences by changing several design parameters, such as cross section     

Urban Design for Continuity of the Urban Context: A Case Study of Landscape Conceptual Design on Both Banks of the Tuojiang River in Luzhou, P. R. China

Luzhou is a famous wine country and a historical city in P. R. China. Insuring the continuity of urban context is an effective method for creating a distinctive image of a city. Considering the authenticity, sustainable development, enforceability and regional differences of urban contexts, it is an appropriate way to extract the original urban context and adopt a proper design method that combines humanized nature, material culture, and intangible culture to form an area with cultural atmosphere on both banks of the Tuojiang River.     

Brake disc thermal stress in material composite design

The temperature distribution and thermal stress distribution of brake discs under emergency braking conditions were studied using the finite element method (FEM). The discs were of three types: those made of functionally graded SiCp/Zl104 composite materials, of uniform (20% volume) SiCp/Zl104 composite materials, and of compacted graphite iron, respectively. The rule of mixtures of dual phase material and the discretization of the material composition distribution were applied to estimate the material properties of functionally graded composite materials. The results show that the temperature and thermal stress of brake discs made of graded SiCp/Zl104 composite are the lowest among the three types studied, and the distribution of temperature and thermal stress of this brake disc type is more uniform than the others. Furthermore, brake discs made of functionally graded SiCp/Zl104 composite can reduce vehicle weight and increase wear resistance capacity. The results provide a theoretical foundation for fabricating brake discs made of graded SiCp/Al composite material.     

粮食烘干水分智能控制系统的应用与问题解决方案

传统的烘干技术,粮食烘干过程中水分很难准确控制,人工调节设备,存在控制滞后、调节不准确、人员劳动量大等问题,烘出的粮食水分波动较大。中央储备粮哈尔滨直属库的烘干机引进安装了DM510E粮食烘干水分智能控制系统,经过一个烘     

Study on Intelligent Displaying Mechanism of Control Fissure of Perilous Rock

Perilous rock is a kind of typical disaster and characterized by multitudinous structural planes; when the disaster happens, only one of the planes is the control fissue and the others are secondary. In this paper, the authors have done some attempts for     

Landfill Leachate Treatment by Cavitating Water Jets

Cavitating water jets were used to degrade complicated organic compounds sampled from landfill leachate from a sanitary landfill in Chongqing, P. R. China. The law of chemical oxygen demand (COD) and the impact of factors such as pumping pressure, confining pressure, cavitating time and pH were evaluated in the experiment. We concluded that a cavitating water jet can degrade complicated organic compounds. Cavitating water jets therefore can improve biological oxygen demand (BOD)5/COD. The optimal cavitating condition was also obtained: at a pH 9.0, confining pressure 0.6MPa, cavitating time 90mins and pumping pressure 10MPa,the COD, BOD5 and BOD5/COD increase to 124.8%, 293.3% and 52.44% respectively. Chromaticity decreases while SS increase to 191.5%. These changes create good conditions for subsequent treatment.