Advanced Materials Research Vols. 785-786

Abstract: In order to get a full understanding the whole bridge's actual stress state and dynamic performance as well as to check whether the bridge structure could meet the requirements of carrying capacity and traffic capacity, loading test has been carried out to the Nanxi Yangtze River Bridge. As the bridge is a long-span suspension bridge, there is a significant geometric non-linear effect which must be considered in the calculation. Besides, a reasonable field test organization scheme is necessary to guarantee the success of the test since there are a variety of working conditions and a large number of loading trucks. Finally, this kind of static and dynamic load test has a high guiding significance to the field test.

Abstract: Floating breakwaters are gaining increased importance in many marine and coastal applications. Various researches have been conducted to optimize the design of floating breakwaters so as to attain greater hydraulic efficiency and functional value. In this research, two floating breakwaters of different design were developed with the aim to reduce wave energy mainly by reflection and energy loss. Both breakwaters (Model 1 and Model 2) possessed a rectangular body with a pair of arms at the top and a pair of legs at the bottom. The legs of Model 1 and Model 2 were upright and 45^o slanted, respectively. Hydraulic performances of these breakwaters subjected to unidirectional monochromatic waves were assessed by the means of physical modeling, and were subsequently quantified by the energy coefficients, namely the coefficients of wave transmission and reflection, and energy loss. The major experimental finding for this study is that Model 1 is a dissipative-type breakwater and Model 2 is a reflective-type breakwater. Both models are efficient wave attenuators and are capable of suppressing the incident wave heights up to 80% in shallow water condition.

Abstract: Topology optimization and shape optimization of structural optimization techniques are applied to transport skate the lightweight. Skate properties by varying the design variables and minimize the maximum stress and strain in the normal operation, while reducing the volume of the objective function of optimal design and Skate the static strength of the constraints that should not degrade compared to the performance of the initial model. The skates were used in this study consists of the main frame, sub frame, roll, pin main frame only structural analysis and optimal design was performed using the finite element method. Simplified initial model set design area and it compared to SM45C, AA7075, CFRP, GFRP was using the topology optimization. Strength does not degrade compared to the initial model, decreased volume while minimizing the stress and strain results, the optimum design was achieved efficient lightweight.

Abstract: Hydrocarbon trap is an effective way to solve the diesel cold start emissions. Zeolites used as hydrocarbon adsorbents are paid more and more attention. In order to study the diffusion of diesel cold start emissions in zeolites, molecular dynamics(MD) in canonical ensemble are employed to simulate the diffusion of ethylene and propylene in MCM-22 in different ways, the mean square displacement (MSD) plot, diffusion coefficient for pure and mixed components are obtained-. The simulation results show that, propylene (C3H6) and ethylene (C2H4) have different diffusion coefficients in MCM22 zeolite at the same temperature; for the same gas, it also has different diffusion coefficients at different temperatures. In addition, the diffusion coefficient increases with temperature rise, thus temperature rise is beneficial to accelerate diffusion process.

Abstract: A new walking mechanism base on biological metal fibre is study in the paper. It used a new type of shape memory alloy (biological metal fibre, BMF) as actuator. The multilegged walking mechanism is employ and study. Its mobile mechanism and trajectory planning is analysed so as to achieve miniaturization goals. The simulation results showed that the multilegged walking mechanism could be effectively driven by the actuator base on BMF.

Abstract: We research the new thin film transformer equivalent circuit modeling, simulate and modify the traditional estimate formula of the transformer equivalent circuit parameters, in order to attain the automatic extraction of thin film transformer parameters. This paper used MATLAB and Agilent ADS on the thin film transformers for the S parameter simulation. The simulation results show the estimation has better accurate and universal, it also shows the effect of different number of turns and thin film materials on the properties of thin film transformer.

Abstract: The second phase nucleation and precipitation around an edge dislocation are studied using phase field method. A new free energy function including the elastic strain energy is established to describe the dislocation interaction with the solute. The results give the distribution of strain field of dislocation and show the precipitates grow up according to the power growth law with the index 2. The simulated results are in good agreement with that of theory of non-uniform nucleation.

Abstract: Due to the emergence of more and more composite armor target, the research related with interval has real application background. The target board with interval structure form attenuates jet penetration effectively. If the interval target and homogeneous target can build equivalent relations, with a certain thickness of the interval target equivalent instead of a homogeneous target board, it will slash test cost and save money. After the target principle and research method, the jet penetration interval target for energy consumption, the jet penetration depth interval target researches are simple introduced, finally the research direction of interval target is put forward with own suggestions.

Abstract: This paper presents the structure and work principle of hydraulic die forging hammer. The mathematic model is established based on momentum theorem which is used to confirm the forging energy and blow number of times. At the same time,it offered the theories reference for the precision control of the run process. The speed, displacement and kinetic energy variety of hammer head were simulated. This research provided the foundation of further controllable and flexible for the forging energy and times.

Abstract: As the core component of methanol production, methanol synthesis takes place in a loop where hydrogen, carbon monoxide and carbon dioxide are converted to methanol per pass through the methanol reactor. Its nonlinear mathematic model is built in this paper, based on partial data from literatures. The research focuses on four types of unit: methanol reactor, methanol separator, synthesis gas compressor and heat exchanger, and performs dynamic simulation under fault conditions. Results show that the model has enough precision to meet fault simulation requirements. This work establishes the research foundation for future quantitative fault modeling, diagnosis algorithm selection and fault effect analysis.