Advanced Materials Research Vols. 753-755

Abstract: The study is limit-locking mechanism of space cable-strut deployable articulated mast. On the base of structure and working principle, the mechanism’s failure in ant-dislocation locking is analyzed and a new analytical model of reliability has been constructed. In the process of calculating reliability index, the factors such as size, assembly error, and space environment influence have been taken into consideration, and the method of MFOSM (Mean First Order Second Moment) has been applied. Based on the actual size of the mechanism, reliabilities of mechanism ant-dislocation locking have been calculated at both room temperature and space limit temperature. The main influencing factors have been analyzed and the improvement has been put forward. Calculations show that the new model has a high reliability in ant-dislocation locking.

Abstract: Nonlinear numerical analysis for the stress performance of RC beam - SRC column and SRC beam - SRC column frame end joints are processed in this paper with the finite element software of ABAQUS. Compared with experimental results, simulation results are found to be reasonable. In order to study the influence of steel bone content on the frame node, two kinds of frame joints are contrastively analyzed under monotonic loading and cyclic loading. The load-displacement curves and hysteretic curves show that with the steel ratio increases, the ultimate bearing capacity improves and the seismic performance becomes better.

Abstract: According to the mechanism and spectrum characteristics of an oil-free air compressor noise source, determined the muffler installed at the air inlet. According to the characteristics of noise source, muffler is designed into type of expansion chamber, considering the structural dynamic parameters, by means of optimization method to determine the size, and the finite element modal analysis is conducted. By solving the muffler's inherent frequency and mode of vibration, knows weather each order natural frequency is away from the peak frequency, the structural dynamics of the muffler can be modification. Methods of structure modal analysis and dynamic optimization on the muffler provided reliable reference to design a high efficient new muffler.

Abstract: For the deep-sea mining system, tracked vehicle is widely used as a miner. From the data of characteristic of the seabed sediment, on which the miner is walking, the relationship of the traction force of the miner and the slip rate of the track is established. The soil-track interaction, an essential issue in tracked vehicle modeling, has been analyzed in detail. Then the kinematic model of the deep-sea tracked miner is established and a PID control strategy is presented to make the miner walk along the desired path. After a series of computer simulations in MATLAB, the validity of the control strategy is confirmed.

Abstract: Due to recent requirements for the systematization of cultivation in agriculture, many kinds of agricultural machines have been used. Vehicles with lifting utility are used to harvest and transfer crops and fruit. These vehicles have buckets that can be moved up and down to harvest crops and fruit in high places. These vehicles often have to operate on unpaved slopes. Therefore, the stability of the vehicle should be studied in the development stage. In this study, the overturn angles of the vehicle in three conditions have been calculated to determine stability. As a result, it could be concluded that these vehicle models are stable.

Abstract: The aluminum alloy automotive wheels are widely used and their quality safety is vital. So their structure design should be optimized. Based on the wheel bending fatigue test and the analysis of aluminum alloy automotive wheel's structure characteristics, the wheel's load was discussed and the analysis of the wheel was done by using Solidworks and ANSYS. The analysis result provides scientific basis for the optimization design of the aluminum alloy automotive wheels.

Abstract: The deformation seriously affects the quality of the products, which is one of the common defects of plastic parts in the injection molding. Factorial design and CAE technology was used to study the product's warping rate influence in this paper. The minimum warping rate was obtained through the Minitab software and the optimized process parameters are verified with the Moldflow software. Experimental results show that the optimization design is effective and the warpage of the product is reduced.

Abstract: This paper reports a CFD modeling study on the optimization design for the shroud structure of a three-phase electroslag furnace using double electrode series technique by a commercial code FLUENT. The Realizable kε turbulence model, Do radiation model and Mixture model are amply used to compute the flow of gases in the furnace under different entrance layouts of the shroud, and the influence of entrance layout on the air volume fraction in the furnace is obtained. Finally, a suited suggestion on the entrance layout of shroud is presented that ring topologies should be adopted.

Abstract: According to the experiment of engine bench test and piston's temperature field, the thermal boundary conditions and the mechanical conditions of piston are obtained. Under the condition of mechanical load and thermal load playing, the stress and strain of original engine is simulated and analyzed. Stress concentration and weak structure of original engine is found. The parameter of piston structure is optimized and the optimizations are put forward and analyzed to verify the optimizations' effectiveness. These provide a reference for the digital modeling and numerical analysis to solver engineering problems.

Abstract: Optimal machining parameters can lead to considerable savings in manufacturing problems. In this paper, to deal with the nonlinear optimization problem of machining parameters which aims to minimize the unit production cost (UC) in parallel turnings, we propose a novel optimization approach which divides this complicated problem into several sub-problems. Then an estimation of distribution algorithm (EDA) is developed to search the optimal results for each sub-problem. Computer simulations show that the proposed approach is efficient in searching the optimal solutions to reduce significantly the unit production cost.