Advanced Materials Research Vols. 634-638

Abstract: First, the index system is established for coal mine safety evaluation according to the influencing factors of coal mine safety. Then, weights of mine safety estimation factor is determined by using Analytic Hierarchy Process(AHP).Last，mathematical model of fuzzy comprehensive evaluation is set up for coal mine based on fuzzy theory and used to safety evaluation of a state-owned coalmine . The researched index system is feasible and effective; weights of mine safety estimation factor are responsed through this index system which can be used widely in the coal mine safety evaluation and administrative decision.

Abstract: Equipment running subtle condition can’t be clearly expressed by clustering result of explicit affiliation in the fuzzy neural network fault diagnosis. In order to solve the problems in the present, the integration of grey clustering theory and fuzzy neural network was researched, and the fault intelligent diagnosis methods based on grey clustering fuzzy neural network (GCFNN) was proposed, the structure and the algorithm of GCFNN were designed, and the model of GCFNN was established. In coal mine hoist hydraulic subsystem fault diagnosis as an example, the feasibility and validity of the method is simulated and verified. The experiment results show that GCFNN can make a correct diagnosis, express more detailed equipment condition information. The method proposed provides basis for the maintenance of the mine hoist, and provides a new approach for the fault diagnosis of the other mine equipment.

Abstract: Overhead transmission line and cable are generally used for across or crossing the railway, highways and rivers.For higher deformation requirement of operation of the railway and highway foundation settlement,to ensure that the cable through the process of foundation in regulating the allowable range, calculation and prediction of foundation settlement is specially necessary.Based on the Peck theory, the dominant factor in foundation settlement-strata loss calculation method is introduced supplemented with measured settlement observation records in this paper,which confirmes that the calculation results are replicab in engineering practice.

Abstract: With the aid of “gambit” and Reynolds Stress Transport Equations, the residential cabin model and the turbulence model were established. By observing the effects of additional inertia force exerting on the water dynamic features of damaged vessels under different linear accelerations, the following conclusions could be obtained: (1) the inflow direction through square and round breaks is deviated from the heave, and contrary to the sailing direction; while that derivation of triangle breaks is comparatively smaller, less effected by inertia force (2) within high turbulence intensity areas, square breaks mainly appear in pre-inflow areas, and triangle and round breaks mainly occur in post-inflow areas (3) with the increase of acceleration, the flow coefficient of the three kind of break tends to decline, whereas that trend seems to be less noticeable with triangle breaks (4) under the effect of inertia force, the shrink coefficient of the three types of break incline to drop; the round breaks is less effected while a distinct variance could be observed in the cases of square and triangle shaped breaks.

Abstract: The simulation of grinding process of an industrial scale ball mill was carried out using the discrete element method (DEM). Combining the information from DEM simulation and theoretical or empirical models, the related parameter values of mill performance are obtained, which have some reference value to the design, optimization and selection of ball mills.

Abstract: The fine-tuning posture 3-SPS-1-S-type mechanism’s kinematics model and position mechanism for segment erector is built by creating general stiffness motion and revolution motion’s posture parameterized representations based on the Lie groupoids theory’s kinematic synthesis, the duality between parallel mechanism structure and performance and PRY angle coordination system’s kinematics analysis.

Abstract: Oxygen blowing volume control is very important in Basic Oxygen Furnace (BOF) steelmaking. A combination model based on information theory and artificial intelligence technology is proposed for oxygen blowing volume calculation. The combination model is composed of Case-based Reasoning (CBR) model and Support Vector Machine (SVM) model. In CBR model, the mutual information is introduced in case retrieval step to determine the weights of attributes. In SVM model, the mutual information is adopt to distinguish the importance of input variables by setting a different weight to each variable. The CBR model is viewed as experience based model and the SVM model is viewed as data based model. To model the oxygen blowing volume accurately, CBR model and SVM model are combined. Tests on a 180 ton BOF data are implemented to validate the effectiveness of the proposed method.

Abstract: In this paper, the design and implementation of a passive magnetic bearing for a vertical-axis wind turbine with a permanent magnetic synchronous generator (PMSG) is presented. By applying a commercial analysis software for electromagnetics, the design of the magnetic bearing is discussed first, then the design of the structure of the wind generator is proposed. The proposed design successfully lifts a PMSG, and the wind turbine generates electric power, decreasing the physical contact largely and the noise and increasing the longevity of the rotating components.

Abstract: Shutdown in condition of sliding pressure operation can quickly make the temperature of cylinder lower, which makes it possible to shorten the repair time. This paper studies the curve of sliding parameters of 1000MW ultra-supercritical units and suggests the optimization curves and precautions for million units in the parameters of the deep sliding down. It provides a good reference to other same power plants.

Abstract: A kind of diesel engine governor used in the combustion engine power station is introduced. During the governor designed and researched, 3D model of the governor is built, virtual assembly is simulated and appearance is evaluated used Pro/E software. The key part is also analyzed used ABAQUS, which is a kind of finite element software. Thus, all defects is deleted in the designing phase, lead time of the product is shortened, design cost is decreased, design quality is improved and the foundation is supplied to parameterization design and manufacturing.