Applied Mechanics and Materials Vols. 66-68

Abstract: Along with the rapid development of chemical industry and the progress of science and technology, a large number of risk source tanks safe hidden trouble, this paper there with the present risk source leaking take on the basis of conventional containment measures, design a kind of adaptive strong magnetic emergency device, and introduces its rapid sealing method, it includes the rapid adjustable bits institutions, strong magnetic containment institutions and pressure, it is in switch diversion institutions with eternal magnets, universal of dynamic compaction ring and soft rubber balloon as sealing the ductility of the original, using rubber sealing, universal and with dynamic pressure locking ring with the move in all directions, adapted to the storage tank of planar, curved surface, large pipe outside surface and so on the different radius of curvature of the leak sealing kiss magnets, and simple structure, convenient operation, satisfy the production equipments of chemical industry and gas liquid storage facilities outside surface leakage occurs rapidly blocked.

Abstract: The method of stage filling mining is introduced in this paper. In order to control the shaft of overburden movement and protect auxiliary shaft, four ore mining plans are proposed for YOUJIANG Mining. The simulation models are established. The powerful numerical ability of ANSYS is used to the reliability of four ore mining plan. The results show that: None of the four plan cause auxiliary shaft rock failure. The first plan is minimum stress in all directions. So it is optimal mining plan. A theoretical basis is provided for actual mining.

Abstract: International tension between energy supply and demand boost developments of energy-saving industry. Structure drawbacks of four linkage bar of the conventional beam pumping unit in oil field artificial lift led to the study of a single crank flexible pumping unit. Because of beam pumping unit issues, such as many energy transfer links, high energy consumption and investment, and so on, the single crank flexible pumping unit made the flexible delivery instead of rigid, substantially reduce the energy transfer links, to reduce the weight of the load rod as a breakthrough to achieve light and compact oil production ground equipment, while minimizing energy consumption, increased functionality, lower investment and overall cost. Field tests show that significant energy savings are found in the single crank flexible pumping unit, which is worth of promoting.

Abstract: In this paper, a one-dimensional mathematical model is established and simulated numerically for the interior ballistic cycle of two-stage light-gas launching facility with a piston-compressor type. A 35mm/130mm light-gas launcher is taken for the primary computing model, and lots of data, such as the pressure on light-gas chamber, the piston velocity, the diaphragm failure pressure, etc. are obtained by computing the model using the numerical difference scheme with the second order of numerical accuracy in space and the first order in time. On the basis of the results of analyzing these data systematically, some advices on enhancing the launching performance of light-gas launcher are put forward. The numerical results show that the developed mathematical model gives the correct trend and can provide useful calculated parameters for the structural design of the components of two-stage light-gas launcher.

Abstract: In order to solve the problem that no-load magnetic flux leakage coefficient is not accurate when it is calculated by the method of magnetic circuit, a model of interior permanent magnet(IPM) generator with 36 slots for vehicle was built through the finite element method of the ANSYS, and then a means of calculating the IPM generator’s magnetic flux was put forward after analyzing the magnetic flux leakage conditions of different rotor structures under the circumstance of not changing stator structure. The ralationships among the pairs of poles, the magnet width, the thickness of non-magnetic sleeve, the length of air-gap and the magnetic flux leakage coefficient were obtained, and they provided forceful guidance for the structural design of IPM generator.

Abstract: This article focused on the effect of group counseling in classes building and students’ positive explanation style in Chinese colleges. The authors adopted group counseling activity into Psychological teaching and estimated its effect with Sociometry and Attributional Style Questionnaire. The result showed that group counseling was better at classes building than traditional Psychological healthy teaching, and especially take advantage of the later approach at positive explanation style obtain. As a result, the program proved the group counseling’s advantage, defined validity of group counseling activity and finally found some effective Group counseling activity schemes which would bring benefit to mental health teaching.

Abstract: As present constraint frequent neighboring class set mining algorithms have some redundancy candidate constraint frequent neighboring class set and some repeated computing. And so this paper proposes an algorithm of constraint frequent neighboring class set mining based on downward search, which is suitable for mining long constraint frequent neighboring class set from large spatial database via downward search. The algorithm adopts binary arrangement to turn spatial instance into integer, which is regarded as a spatial transaction, and it uses candidate domain mapping to create constraint frequent neighboring class set via downward search, namely, the algorithm creates candidate domain and uses an integer in the domain to map a candidate, downward search is that this integer of mapping candidate is from maximum to minimum. The method is different from traditional down search or top-down search. The experimental result indicates that the algorithm is more efficient than present constraint frequent neighboring class set mining algorithm when mining long constraint frequent neighboring class set.

Abstract: In order to verify the effectiveness of oil analysis technology on air compressor condition monitoring, oil samples are taken from lubricating system of D-100/8 type air compressor for monitoring by comprehensively using atomic emission spectroscopic analysis technology and ferrographic analysis technology. The result shows that the atomic emission spectroscopic analysis can comprehensively monitor content of additives, contaminants and wear metals in oil products. The effective analysis range of emission spectroscopy is particles with size smaller than 8~10μm and it fails to measure large-size wear particles produced from heavy wear of the equipment. However, the ferrographic analysis can further confirm wear condition of the equipment according to size, shape, material and superheated degree of particles, which just makes up the shortage. Thus, the combination of atomic emission spectroscopic analysis and ferrographic analysis is quite necessary for monitoring contamination and wear condition of lubricating oil products of air compressor and preventing sudden failure of machinery.

Abstract: This paper gives a model of using CFD to calculate the airflow between taker-in and its casing in the A186 carding machine for researching static pressure of the airflow with FLUENT software. The model analyzes the static pressure in the casing of taker-in under the condition of the different rotation speeds of taker-in and cylinder and two gauges in air inlet of the casing. The numerical calculation of the model shows that the rotation speed of taker-in and cylinder has an obvious influence on the static pressure of the casing, of which the effect of rotation speed of taker-in is larger than that of cylinder, and the static pressure increases gradually from air inlet to outlet between taker-in and its casing. Furthermore, the calculation results confirm that while the gauge of the air inlet diminish, the static pressure of the air inlet decreases but that of the air outlet has little change. The calculation result of the model has a good agreement with the conclusion of previous study with the experimental method.

Abstract: Reaction sintering B₄C/SiC ceramics with high density were manufactured. The effect of the carbon content in green bodies on the microstructure and mechanical properties of the ceramics has been studied. Results showed that the carbon content and the value of carbon relative density (ρ_CRD) in the green bodies were the major factors affected the composition, that is, the free silicon and carbon contents and mechanical behaviors of sintered specimens. The optimal value of ρ_CRD was gotten at 0.85 g/cm³. The fracture toughness, flexural strength, and hardness of the composites increased with increasing carbon content up to 20 wt.%. The maximum values of fracture toughness of 3.8 MPa∙m^1/2, flexural strength of 475 MPa, and hardness of 32.0 GPa were obtained under the following process parameters: value of ρ_CRD in the green bodies was about 0.85 g/cm³; carbon, B₄C and SiC contents in green bodies were 20 wt.%, 30 wt.% and 50 wt.%, respectively; compact pressure was 75 MPa and sintering temperature was 1600°C.