Advanced Materials Research Vols. 383-390

Abstract: The thickness of concrete protector is related to bearing resistance, endurance and fireproof property of concrete structure, The standard stipulates that structure tesand fireproof property of concrete structure, the standard stipulates that structure test must including the thickness of concrete protector. The article is trying to analyse performance and precision of KON-RBL concrete protector testing instrument, finding the regression equations, precision of KON-RBL concrete protector testing instrument, finding the regression equations, than trying to verify in engineering practice.

Abstract: The Pallet Loading Problem (PLP) in packaging industry usually deals with generating optimal pallet patterns of placing boxes on a rectangular pallet. For a given pattern, the boxes can be placed in different set of sequences each affecting efficiency and productivity of robotic palletisation. Therefore, getting an optimal pallet pattern does not guarantee an optimal pattern placement strategy. Therefore, there is a need to develop a methodology that considers the palletisers physical characteristics and limitations in robotic palletising systems. This paper presents development of a methodology to determine the placement sequence in robotic pallet pattern formation with the aim of improving the operational efficiency in robotic palletisation.

Abstract: Underwater vehicles have been developed mainly for underwater exploration and rescue. Many large- and middle-size vehicles are available but few are in smaller scale. As the size goes into mini-scale which is less than 20 cm, it is challenging to allocate required components within limited space, while providing designed functions at the same time. The aims of this research are to design and rapid manufacture structural components for a remote-controlled underwater vehicle in the mini-scale region. The vehicle would integrate vision capability to provide functions of underwater ecological observation and tracking. In order to design the structural components for this mini-scale vehicle, commercial CFD software was adopted to simulate flows. An improved external shape was obtained and detailed designs of the structural components were implemented. A rapid prototyping technique, Shape Deposition Manufacturing (SDM) process, was utilized to rapidly manufacture these components. The finished components were assembled with control modules and propulsion systems as an underwater vehicle and the preliminary underwater test was conducted successfully.

Abstract: In product assembly, optimized sequence is a prerequisite for automated systems. The assembly process can be optimized through appropriate selection and allocation of the given tasks in a multi-device framework. These two discrete tasks need to be integrated to produce the optimum result and a cost effective system to cope with the needs of the system, the present work attempts to generate an automatic assembly sequence and seeks for optimal allocation of tasks amongst the available robots. Further, an effective task allocation approach considers the capabilities of the deployable robots. This paper presents an integrated approach for assembly sequence generation and task allocation for multi-robot systems by considering their capability in terms of time and space. An example of a 21 part drive assembly is given to illustrate the concept and procedure of the proposed methodology.

Abstract: Reliable manufacturing equipment is an indispensable factor to the performance and profitability of manufacturing systems. Total productive maintenance (TPM) has been recognized as a comprehensive manufacturing strategy to maximize equipment reliability and effectiveness through rooting out all manufacturing losses. Availability of equipment is a focus area in TPM to improve effectiveness throughout the lifetime of the equipment. This study develops a mixed integer linear programming model to increase equipment availability considering maintenance cost of each machine in the system. The main objective is minimizing total cost while designing optimal material flows between different operational levels of manufacturing process. A hypothetical problem is presented and solved by the developed model.

Abstract: The electro-magnetic field distribution and the effect of clearance ratio (CA) on magnetic flux leakage and the axial electro-magnetic force were analyzed and calculated by ANSYS. Through this method, we got the optimal value of clearance ratio, designed the axial magnetic bearing, and provided the theories and methods for the magnetic bearing’s analyzing and designing, which makes its designing faster and more conveniently.

Abstract: The Water-flowing fractured zone’s height and its distribution has an important effect on stability of the surrounding rock and the safety in the subsequent production under reservoir. In the paper the Drucker-Prager yielding law is used. The limit value of tensile stress and shear stress is used to judge the water-flowing fractured zone’s height and its distribution. The fitting formula is obtained by origin software under different advance of the work face. The peak value of horizontal movement is 1.13m. The symmetrical subsidence basin is formed in the center of work face. The peak value of subsidence is 3.86m. The sum of surface subsidence accounts for about 43 percent of the mining height. The advance of around 300m is the distance that the water flowing fractured zone’s height reaches the highest value. The biggest height of water- flowing fractured zone is 146m.

Abstract: The radial temperature difference calculation of a steam drum wall is an important step in the process of calculating the low-cycle fatigue lifetime of a steam drum. So the German Standard TRD301 recommended a temperature difference computing method based on the simplified solution for the radial temperature of a steam drum wall. In order to validate the feasibility for the application of this computing method to solving the same problem of a supercharged boiler, on the basis of the reasonable simplifications to the unstable heat conduction problem across a steam drum wall, its heat-conduction equations and definite conditions were determined, then the analytical solution for the radial temperature of a steam drum wall, together with its approximate and simplified solutions, is derived. The running example of one super-charged boiler was calculated and analyzed by use of the radial temperature difference computing methods based on the approximate and simplified solutions respectively. The com-puted results show that the German Standard computing method of TRD301 has great limitations in the same problem calculation of a supercharged boiler, and it can’t apply to the researches on the same problem and its relevant problems of a supercharged boiler as a universal computing method.

Abstract: This paper was prepared by liquid phase deposition of quartz sand load nanometer titanium dioxide film, in which quartz sand as the carrier, and to Fe3+,Zn2+ as doping on the membrane was modified. The initial value of pH is 6.7,in this condition, select the heating temperature, the doping ratio of Fe3+andZn2+ to design the orthogonal experiment. CODCr removal and pH value as the evaluate index, to deal with the real tannery wastewater, discussed when Fe3+,Zn2+ co-doping, the best doping ratio of them, the best technical conditions such as heat treatment temperature; and their affect on CODCr removal rate and pH value.Under the optimum conditions, confirmed by further study that Fe3+ doped titanium dioxide modified membrane absorption band red shifts, the utilization of solar is increased, the tannery wastewater which was treated by modified membrane, its biodegradability is greatly increased.

Abstract: In this paper, Kanai-Tajimi spectrum as earthquake random excitation is applied. A Structure with Viscoelastic Dampers is analyzed by random method and reliability of energy dissipation is presented. The effect of energy dissipation of viscoelastic dampers added to building is studied under four working situations. The result of calculation indicates that the reliability of energy dissipation will be higher if more dampers are installed. Supposing that the quantity of dampers is fixed, the reliability of energy dissipation will be decrescent if energy dissipation degree is larger. If the reliability of energy dissipation is fixed, the dampers parameter is the determinant factor.