Advanced Materials Research Vols. 204-210

Abstract: This paper re-defined the concept of conjugate axis and presented the application of this concept. Based on the research mentioned before, this paper studied the interference surface generated by the milling cutter, when a double circular gear is generated by a milling cutting tool. We fined a way to eliminate such the interference surface by the help of conjugate axis. The research of this paper gives the concept of conjugate axis the new function. The method presented in this paper is very useful for the grinding process of the hardened double circular gears.

Abstract: A study is made of the forming theories and the computer aided design of the rotary cutting burs, for the purpose of finding the movement of the machining system and the corresponding sectional curvature of the groove conveniently. The equation of the cutting edges on the tool surface is deduced in this paper. The contact condition between the cutting edge of the tooth of the cutter and the grinding wheel is found, and the equation of the contact condition is deduced as well. Then the section line of the cutting edges of the rotary burs after CNC controlled machining is calculated. The research is useful for the programming of the CNC grinding on the CNC controlled machine tool.

Abstract: This paper deduced a new kind of discriminate equation of foot-cut of the gearing, and introduced the application of this new equation. Some times the surface to be machined or the gear profile to be generated could be expressed by the equation as: r̄ =r̄ (u,v) , but some times the surface to be machined or the gear to be generated could only be expressed by the equation as: F ( x,y,z ) = 0 . If the surface or gear profile is expressed by the formal one, we already have several kinds of discriminate equations to deal with the problem of foot cut. But how about the occasions when the surface to be machined can be expressed by the equation as: F ( x,y,z ) = 0 . This paper deduced a new discriminate equation to calculate the foot cut condition and find the way to prevent it.

Abstract: This paper presents a compound fuzzy control algorithm method having modifiable factors based on PLC, and the modified fuzzy controller and PI regulator is realized by PLC, the system solves problems of imprecise paper cutter speeds, instability, and paper cuttings of different lengths. The results show that the system can effectively restrain influences from pure time-delays while maintaining stability and strong robustness.

Abstract: Ant algorithms are a recently developed, population-based approach which was inspired by the observation of the behavior of ant colonies. Based on the ant colony optimization idea, we present a hybrid ant colony system (ACS) coupled with a pareto local search (PLS) algorithm, named PACS, and apply to the continuous functions optimization. The ACS makes firstly variable range into grid. In local search, we use the PLS to escape local optimum. Computational results for some benchmark problems demonstrate that the proposed approach has the high search superior solution ability.

Abstract: An Adaptive particle swarm optimization algorithm is proposed. Algorithm combines with pareto local search (PLS) method and adaptively adjusts flying time. During the search process, our algorithm can enhance the local search ability of particle swarm optimization (PSO) thought adding random perturbation to local search. The flying time of every particle in our algorithm can adaptively adjust with the evolutionary generations. Some optimization tests of the standard benchmark function confirm that our method has a stronger ability of global optimization.

Abstract: Sufu, the Chinese famous fermented soybean curd, is similar in process technology and procedure to Camembert cheese. In this paper, the strain of P.camemberti, which is traditionally used in cheese manufacture, was investigated in sufu preparation in comparisons with traditional sufu strains of Actinomucor elegans by four aspects, including temperature、initial pH、NaCl concentration and amino acid nitrogen content during maturation period. Results obtained by orthogonal experiments indicated the optimized conditions were fermented at the temperature of 30°C for 3 days with P. camemberti spores to the concentration of 1.0×10⁵ cfu/mL, and the amino acidic nitrogen content reached 0.35%. This research proved the strain of P. camemberti may be a promising strain of sufu production that may be widely applied in future.

Abstract: In order to most effectively utilize the wind energy and improve the eficiency of wind generation system，an optimum control strategy of doublyfed induction generators (DFIG) was proposed,which made the system operationfor both the maximum wind enemy captured below the rated wind speed．Based on the wind turbine characteristics and basic electromagnetic relationship of DFIG the mathematical models of the stator active power and reactive power of DFIG were derived to fulfill maximal wind energy capture and conversion．A dual-passage excitation fuzzy control strategy based on dynamic synchronous reference frame was applied to control the proposed optimal stator active and reactive power．The operational performan ces of the wind turbine system with DFIG with wind speed variation were analyzed an d compared by using Matlab/Simulink．The results show the correctness and feasibility of the proposed control strategy.

Abstract: Targed to realize collaboration and sharing of enterprise resources,we provised a model of enterprise information management based on semantic service grid,and realized resource discovery with third-level matching stratage. One simplization method for calculating QoS of resources was adopted,which was based on resource’s surplus productivity and unifying its daily average productivity.Finally, the model’s prototype system was provided,based on which experimental result indicated the proposed model and the third-level matching strategy were feasible and had certain application promotion value.

Abstract: In order to study the nonlinearity during the start-oscillation of thermo-acoustic instability, an experimental setup was built. The growing process of nonlinearity during the start-oscillation of thermo-acoustic instability was captured and analyzed. Experimental results revealed that after a suitable resonance mode corresponding to the structural of the combustor was selected, the pressure perturbations inside the combustor grow in amplitude into a very large amplitude and self-excited oscillation in a very short period of time. Then, slowly, the nonlinear effects adjust the shapes of pressure waveforms and amplify the oscillations. Ultimately, a limit-cycle oscillation with smooth and uniform pressure waveforms was obtained, and the acoustic waves exhibit only the main resonance mode, damping other modes of instability.