Advanced Materials Research Vols. 926-930

Abstract: The multi-body dynamics software EXCITE was used to simulate the marine diesel engine in this paper. The result shown the analysis of the crankshaft transient motion. The purpose provided a theoretical basis on the actual conditions of crankshaft vibration, deformation, stress distribution and improve the design of the crankshaft structure.

Abstract: In order to optimize vibration digging shovels drag reduction performance parameter, building the regression model of traction resistance between vibration frequency and amplitude, penetrating angle and the traction rate based on the vibration reduction simulation experiment results, moreover, it is optimized. The results show that the effect factors of traction resistance from high to low is the vibration frequency, the traction rate, penetrating angle, amplitude. When the drawing speed is 0.67 m/s, the vibration frequency is 13.77 Hz, vibration amplitude is 11.93 mm, penetrating angle is 8.35 °, optimization value of traction resistance is 1449.59 N. Test results show that: the field test resistance average and the simulation results error is less than 5%, which illustrate that the regression model can better reflect the relationship between the vibration frequency, traction rate, penetrating angle, amplitude and traction resistance.

Abstract: This article presents the engine control studies of the various oxygen-rich aspiration constituent. Which reforms the concentration and distribution of the oxygen constituent in the cylinder before the combustion by changing the aspiration constituent and charge, to improve the active control technology of combustion and emission. Improve the quenching phenomenon at the cylinder wall and raise the high temperature at the cylinder center by controlling the distribution of the various oxygen concentrations, in order to reduce the emissions of CO, HC and the unburned particulate matter (PM), to enhance the economy of the fuel and increase the dynamic property. I make a simulation calculation of the oxygen-rich inlet of gas engine by the CFD software Fluent, analyses the oxygen-rich aspirating rules under particular condition and its adaptability to the hemispherical gasoline combustion chamber, and examines the characteristic of the distribution of oxygen constituent in the cylinder after where oxygen and air mixes.

Abstract: The aircraft AC generator is the most important component in the aero-power system, which has close relationship with the flight safety. This paper recorded Cessna 172Rs power system failure, analyzed the cause of this failure, studied the principle and mechanism of contactor in this aircraft. It proposed three measures to eliminate similar fault, to be popularized and applied in the practical application, it was proved that it can reduce the incidence of this kind of trouble.

Abstract: From the viewpoint of primary theory of Finite Element Analysis, as well as practical application, the present paper sets up a model for the use of analyzing the fluid-elastic instability of heat exchanger array. In accordance with related compared velocity and mass damping parameter, the author obtains the stability diagram and analyzes the diagram of the array displacement when it reaches the critical value of flow velocity. Accordingly, the instability of heat exchanger array in critical value if flow velocity was verified.

Abstract: The work in this paper will present a developed methodology for process capability evaluation and improvement in a multistep machining process. In this methodology, a physical model is developed to describe the complex variation propagation process throughout all steps in a multistep machining process. Then building on this physical model, a process capability index evaluation method is derived. A capability improvement procedure is developed to prioritize process improvement efforts based on the sensitivity analysis of process parameters. Finally, the effectiveness of the proposed methodology is demonstrated in a case study.

Abstract: This article aims at the fracture problem of the transmission linkage of swaying yarn machine, based on the improved transmission mechanism, used the theory of Kinematics and Mechanics, the paper analyzed and calculated the transverse force and the longitudinal force on the transmission linkage of the swaying yarn machine, and got the force direction and size, and the maximal position and value of bending moment in the one rotary process of the driving crank of transmission linkage, to supply the theory basis of solving the problem of transmission fracture of swaying yarn machine.

Abstract: Efficient secondary cooling water control level slab continuous casting process and quality are closely related. Casting solidification heat transfer model is the basis of process control and optimization, heat transfer model based on determining the secondary cooling system is the most widely used method for casting production process can be simulated. However, when considering the many factors affecting the production and input conditions change significantly, real-time and strain of this method is not guaranteed. Therefore, the artificial intelligence optimization algorithms such as genetic algorithms, neural networks, fuzzy controllers, introducing continuous casting secondary cooling water distribution and dynamics of optimal control methods, the rational allocation of caster secondary cooling water and dynamic control is important.

Abstract: Motorcycle’s rear shock absorber has been built as a nonlinear mathematical model to analyze the shock absorber damping force characteristic. The model has been divided into various subsystems that including hydrodynamics flow model, friction model, elastic deformation model, and gas pressure model. It has been implemented in MATLAB/Simulink environment, and validated against experimental test data. The results show that the model is sufficiently accurate, the practical behavior of the shock absorber can be reproduced. The relationship between the valve system parameters and shock absorber outer characteristics has also been analyzed. Furthermore, the influence of valve system parameters is analyzed to provide some theoretical basis for the motorcycle shock absorber performance optimization and structure improvement.

Abstract: The paper introduces system components and working principle of the ultrahigh pressure water jet, with theoretical analysis on fluctuation characteristics of pressure booster pump flow. On the basis of the AMEsim simulation model established on various hydraulic components in the system, through a large number of simulation experiments to compare simulation curve with different parameters. Analysing the system characteristics for pressure and flow affected by some parameters such as: volume, booster pump motion control and the number of nozzles, in order to improve the system stability for pressure and flow and optimize the parameters.