Advanced Materials Research Vol. 842

Abstract: This paper presents the manufacturing process of scrimber by using mulberry branches and urea-formaldehyde. The effect of density, hot-pressing conditions and resin content on scrimbers mechanical properties was conducted. The results showed that the mechanical properties of the scrimber met the relative requirements in the density of 0.8 g/cm³ while the resin content was 12% and the hot-pressing conditions were in 1.5MPa, 100°C and 1.4min/mm. The MOR, MOE and IB of samples had reached 40.14MPa, 5024.20MPa and 0.44MPa under the best process condition. The MOR and MOE had achieved the standard of LY/T 1655-2006 and the surface of scrimber had natural textures which could be used as decorated materials for building.

Abstract: Considering the corrosion degree of reinforcement, the chloride penetration resistance of concrete and chloride concentration distribution in concrete, a health evaluation method for durability of harbor engineering was established by analytic hierarchy process (AHP). Analysis of a harbor in South China demonstrates that the health indicator for durability condition of existing structures can be effectively used to quantitatively health evaluation for durability of practical engineering.

Abstract: We propose a mathematical model of large elastocreep deformations. As part of the constructed mathematical model the problem of deformation of the material in the vicinity of microdefect was solved. Integro-differential dependence of external pressure from irreversible deformations and displacements was obtained. The laws of loading material from vector displacements were calculated. We have shown that the monotonous laws of deformation can lead to non-monotonous stress changes.

Abstract: The formation mechanism of skid lines in automobile panel forming process is investigated in this paper. Based on finite element dynamic explicit algorithm and area coordinate method, a numerical system for predicting skid line is proposed. By comparing with the experimental results, the prediction system is proved to be accurate and efficient.

Abstract: The regular arrangement of the plant organs is botanically known as phyllotaxis. Among the types of phyllotaxis found in nature, spiral phyllotaxis is the most frequently found pattern. The unique arrangement of this pattern in plants has benefited most of the plant structure as it enables them to grow more efficiently and compatible for physical constraints such as moisture and amount of light falls. In this research, the unique spiral phyllotaxis pattern has been adopted as idea for member arrangement pattern for structural space frame system. Two type of spiral phyllotaxis pattern and one regular model are generated. Analysis using finite element software LUSAS has been carried out in order to determine the effect of member arrangement following spiral phyllotaxis on stresses and displacement in the space frames.

Abstract: Seat suspension is one of a most important part of a vehicle, also it significantly affects the comfortableness of cars. Compared with traditional dampers, magneto-rheological ones can achieve the condition with continuous adjustable damping force. Compared with electro-rheological fluid, magneto-rheological ones have some merits including noise defending, large damping forces and fast response etc. Based on magneto-rheological dampers, the structural parameters were calculated and characteristic test was conducted. Constant amplitude of 5mm and frequency of 1hz were applied. As the current was respectively changing, the peak of damping forces changed correspondingly. In order to figure out a model, which can illustrated the influence of damping force on current, researchers also identify the magneto-rheological dampers using support vector regression. In this paper, research related with fuzzy control of seat-suspension system has been done by using a Matlab simulation model, so as to verify the damping forces can be adjustable and it has priority on vibration attenuation.

Abstract: The gas-liquid flow in a wave-plate separator is extremely complex due to its three-dimensional characteristic. Numerical simulation accomplished by former investigators using two-dimensional model may be appropriate for the iteration of pressure drop, but they were far from accurate in prediction of removal efficiency. To fill the gap, a three dimensional geometrical model of wave-plate separator is set up in this paper, RNG k-ε model is employed to compute the gas phase flow field, and the droplet trajectories were predicted applying the Lagrangian method. The turbulent dispersion of droplets were simulated by discrete random walk model. Using the assumption of a constant liquid loading of gas flow, simulation were accomplished for six different inlet velocities and two different droplet sizes. The influence pattern of gravity together with gas velocity on droplets distribution and the overall removal efficiencies were obtained.

Abstract: The water hydraulic reciprocating plunger pump driven by linear motor is suitable to deep sea application with high efficiency and variable control. Aiming to study the principle structure and working characteristics of the pump, two patterns of valve and piston distribution were designed. And the control method and the performance were analyzed by simulation based on the AMESim model. The results show that the pressure and flow pulsation of piston type pump are much smaller than the valve type, even though the piston type is large in scale and works at low flow rate. Compared with a valve distribution tri-linear-motor reciprocating plunger pump (VDTLMP), as the flow rate of the piston distribution double linear motor reciprocating plunger pump (PDDLMP) is decreased from 36.7 L/min to 21.2 L/min theoretically, the pressure pulsation amplitude is decreased from 46% to 2%, and the flow pulsation rate is also decreased from 0.266 to 0.007. These results contribute to the research on deep-sea water hydraulic power pack and direct drive pump with high efficiency and energy conservation.

Abstract: Thermal design improvements of avionic devices in confined space under supersonic conditions are presented in this paper through a numerical studies and improvements on the heat sinks and cooling vents. The components locations are also rearranged. Thus the avionic device can operate in the confined space, and heat dissipation can be easier. Simulation results show that the cooling vents added on the surfaces of the electronic cabinet can make heat exchange more smoothly, and the high temperature zones are affected by the changing of the locations of heat sinks obviously. The design rules and guidelines are proposed to improve thermal design. The design and simulation results can be used as the reference for the thermal design of other avionic devices in the similar style.

Abstract: Natural gas heaters are widely used in gas-fired power plants to meet the combustion needs and to improve the combustion efficiency. For the control features and technical requirements of the natural gas heater, the computer automatic control system for natural gas heater has been designed,and realizes the temperature and liquid level real time measurement and control. The system increases significantly the control accuracy of natural gas temperature, eliminates potential unsafety and improves production efficiency.