Advanced Materials Research Vols. 834-836

Abstract: As the sandwich structure materials extensively used in the engineering field, the existing sandwich structure materials can not meet the requirements of engineering design gradually. New sandwich structural materials with efficient, energy-saving and easy processing need to be developed urgently. Relying on the mature research results now on honeycomb sandwich structure, the class-honeycomb sandwich structure is put forward for the first time, meanwhile, innovate configuration in the structure. Based on this, the paper analyzes the mechanics properties of the structure and the results showed that the new class-honeycomb sandwich structures mechanics properties have improved greatly compared with the original hexagonal honeycomb sandwich structure. And also simulation analysis was carried out on the cores structure. The validity of the equivalent elastic constant is confirmed through the theoretical analysis and simulation analysis. For this reason, it has great theoretical significance and engineering application value.

Abstract: Locking mechanism of aviation aircraft is very important for perform mission. In order to avoid motion interference of locking mechanism efficiency and ensure mission completion and flight safety, its motion interference is analyzed based on its working theory. The spatial distribution of locking mechanism is designed in reason. The 3D solid assembly model of locking mechanism is constructed by using CATIA software. By the seamless interface program Sim-Designer between CATIA and ADAMS, dynamics simulation of locking mechanism system is realized in the circumstance of ADAMS. Its motion law is studied through simulation under the loading condition. The results show that there are good coincidence between simulation results and theoretical calculation datum. The method has more practicability and reasonability for the dynamics study of locking mechanism. And it offers theoretical basis for design and use of locking mechanism.

Abstract: At present, it is scarcely possible to represent results in deterministic calculation in the definite finite element analysis. Stochastic finite element method is on the basis of the combination of mathematical statistics and the finite element method. Then we can use mathematical statistics to analyze the randomness of the parameters, get the data of dependent displacement and stress, and finally calculate all kinds of features. In this paper, modeling and calculation function and unique PDS module offered by ANSYS are applied to analyze the reliability of lateral load bearing single-piles.

Abstract: A new performance test system is presented in this paper, as we all known, hydraulic support is the most important equipment in mechanized coal mining. Electric hydraulic valve, as the key components, consist of electromagnetic pilot valve and mechanical valve bodies. When electromagnetic pilot valve hasnt enough driving force, precursor core wont work normally. The test stand can measure relationship between displacement and force of electromagnetic pilot valve. First of all, electric hydraulic valve is introduced simply, then detailed designing process. The test Bench includes measurement and control system, as well as working theory.

Abstract: According to selection of bearings for the impact of multiple factors and ambiguity, a mixed calculation method of variety of algorithms was presented. Problem was better solved to quantitative of the multiple factors. The unique results of the Selection were ensured. Through MFC, Pro/Toolkit of Pro/E interface was called to generate three-dimensional graphics of bearing automatically in VC++ platform. The three-dimensional graphics of bearing could be used directly in the assembly model of product.

Abstract: The injury characteristics of baby walkers were analyzed based on injury data about baby walkers from the National Electronic Injury Surveillance System (NEISS) of U.S. and the National Injury Related Products Surveillance System (NISS) of China. The main causes for the baby walkers injuries were identified by testing and evaluation, including insufficient anti-collision space, low designed static and dynamic strength, substandard outsourced casters and the processing technique not in conformity with the requirements for accessible parts. Such suggestions were put forward as increasing the anti-collision space, enhancing the strength of structural materials, performing stricter acceptance check for the outsourced casters and confirming the process inspection of semi-finished products.

Abstract: Unlike any other ordnance, the maintainability of artillery projectiles is ignored from the design and production period to launching and exploding period. In this paper, the necessary feasibility of maintainability analysis and design for artillery projectiles are described thoroughly and demonstrated adequately. The disadvantage will be overcome thoroughly which is difficult to maintain for new projectiles, especially for costly projectiles, with applying the conception of maintainability of artillery projectiles to the course of argumentation, design, and production of artillery projectiles so as to improve the reliability of ammunition and strengthen the tactical efficiency of armed forces.

Abstract: A new apparatus is designed and fabricated for rapid heating and quenching (RHQ) process of Nb/Al precursor short wires. As the primary step, Nb/Al precursor with large Nb/Al filaments is manufactured through rod-in-tube (RIT) method to study the RHQ parameters. This apparatus could heat Nb/Al precursor short wire up to about 2000 °C in 10 ms-100 ms and then quench the wire into molten gallium. Results of line scan from SEM-EDS show that Nb₃Al is formed in short wires. Tests show that the zero-resistance temperature of Nb₃Al short wire is about 17.7 K, which also indicates that stoichiometric Nb₃Al is formed. However, the critical current (I_C) is only 1.8 A at 10.2 K. The low I_C can be explained by the low volume ratio of superconducting Nb₃Al and lots of voids along the wire. Further optimization and improvements will be performed.

Abstract: In the process of detecting and calibrating for power equipments, it appears a phenomenon that standard equipment is damaged by harmful random large current from tested equipment. This danger signal mainly occurs in the transient state of tested equipment, i.e., in a short time after starting to output new set current. This paper proposes a method for protecting standard equipment to eliminate damage caused by random large current. Its content mainly describes one of the key parts of this scheme including accurately sampling and transient signal removing intelligently in details. Design the related current sampling circuit, test results show that the resolution of circuit can reach to 10mA, which satisfies the work well.

Abstract: The aim of this study is to optimize the cooling device for high power LED headlamp. The feasibility of using SMD (Surface Mounted Devices) resistor instead of LED chips has been analyzed by FloEFD and the relationship between temperature and total input power has been found. In order to evaluate the cooling performance of the heat pipe, two different arrangement forms has been used. Based on the simulation, heat pipe arranged in rectangle can satisfy the requirement of high-power LED headlamp. These results also laid a theoretical foundation for later experiments.