Applied Mechanics and Materials Vols. 687-691

Abstract: In this paper, synchronization of a fractional-order delayed system is studied. Based on the stability theory of fractional-order systems, by designing appropriate controllers, the synchronization for the proposed system is achieved. Numerical simulations show the effectiveness of the proposed scheme.

Abstract: This paper analyses the operating principle of Steady-state Cornering of semitrailer with trailer axle steering mechanism。Analytical method was used for kinematics analysis on trailer axle steering mechanism based on the preceding analysis result. trailer axle steering mechanism was simplified into a five-bar linkage mechanism. Constraint conditions of the five-bar linkage mechanism were discussed based on its actual installing space. Accordingly, size ranges of the critical components of trailer axle steering mechanism were obtained, providing conditions for further study on semitrailer dynamics.

Abstract: A industrial design method based the numerical analysis is proposed to meet appearance modeling of airborne evaporation cycle system. The model is analyzed by using FLUENT. It better simulates the external flow field, gets the surface pressure distribution and velocity distribution of the flow field, and determines the aerodynamic characteristics of the system, which provides a new way for system modeling design.

Abstract: The interference principle of backscattering light in the optical fiber is analyzed theoretically and the sensing mechanism of φ-OTDR vibration sensor system is introduced briefly in this paper. The trace of backward Rayleigh scattering is obtained by MATLAB simulation, and it is compared to the scattering curve by experiment. The result shows that noise is inevitable in the experiment, and the desired signal is difficult to be detected for the high noise amplitude. For obtaining high SNR in the experiment, the compositions and causes of the noise is introduced and the effective suppression method are put forward.

Abstract: In order to control the speed of hydraulic cylinder precisely through a given voltage signal on proportional valve, we adopt the pressure compensator and proportional directional valves throttle circuit in the hydraulic feed system of the designing coal and rock cutting test equipment. The simulation model of the system based on AMESim is built, the dynamic characteristic on the feed system of proportional valve-controlled cylinder’s speed is analyzed, experiments under no-loading condition on the hydraulic pump station is done. Simulation and experimental results show that the cylinder’s speed can be controlled precisely through a given voltage signal on proportional valve, the experimental and simulation results are close, which can better meet the test requirements of coal and rock cutting. Finally the sorting curves of the cylinder’s speed varies with the proportional valve opening can provide the basis of cutting parameters of coal and rock cutting test equipment.

Abstract: Structure design of airborne evaporation cycle system is performed in PROE. As structure is an important bearing component, its performance directly affects the life of the system. Statics analysis is made by using ANSYS to get the deformation and stress diagram. Compared with allowable stress and strain, it verifies that the structure of the design meets the requirements. Modal analysis is made to get the previous order modal frequency and the deformation, which provides theoretical basis for further optimization.

Abstract: Feeding, moist, loose, remoisten, cutting and bake etc. are important processes and the cutting, which is one of the most important aspects of cigarette production, is one of key processes to determine the quality of cigarettes. In this paper, the principle SD508L Hob Cutter, mechanical motion and control are analyzed, and explained how to improve the quality and other issues in cutters for tobacco productions.

Abstract: Ultra-precision machining technology is adapt to the development of modern technology a new technology of mechanical processing, the new achievement of the development of the integrated application of the mechanical technology and modern electronic technology, measurement technology and computer technology in advanced control, testing method, etc., makes a further improve the precision of machining. At present the increasing maturity of the ultra precision machining, has formed a series, it include ultra precision cutting, super precision grinding and super precision grinding and super precision special processing, etc. Ultra-precision machining to high precision, high efficiency, large-scale, miniaturization, intelligent, process integration, the integration of online processing detection, such as green direction.

Abstract: CNC vertical lathe is the main on products. The domestic and foreign demand is also very big. The key part of the high precision is on the control of the spindle. This design is with the German SIEMENS company programmable controller (PLC), S7-200 as the main controller; Germany SIEMENS company 6 ra7075 dc speed regulator, Z4 dc speed regulating device of dc motor, dc speed control was adopted to realize efficient and accurate control of machine tool spindle, and the electrical principle diagram is given.

Abstract: This design is based on the structure of various thresher, the main research of the corn thresher drive system structure, working principle, and on this basis, based on the design of the finished parts, on corn dish itself characteristic to carry on the design, when threshing grain rod roller high-speed rotation, the corn by continual lines between grid type and gravure roller rod, and the action between the corn cob constantly collide with each other, to achieve the seed plate separation, then the net grains, complete threshing.