Applied Mechanics and Materials Vols. 713-715

Abstract: The internal flow of jet fan has been simulated using FLUENT software.By changing the length of exit duct and the angle of the exit cowl,a series of numerical simulation research has been done.The calculation results show that the length of exit duct and structure of exit cowl has obvious influence on jet fan aerodynamics performances and reasonable export structure can effectively improve jet fan aerodynamic performances.

Abstract: There are many factors influencing the reliability allocation of CNC machine tools and some are difficult to analyze quantitatively, a comprehensive reliability allocation method is proposed using interval analysis, fuzzy comprehensive evaluation and analytic hierarchy process. Many influence factors were considered and endowed with different weight respectively according to the influence degree. In this paper, a reliability allocation model is proposed for CNC machine tools, which used interval number instead of real number to express uncertain information. It could make use of the field test information and experts’ experience comprehensively. Finally, the application of this method is illustrated with an example, and the results showed that the allocation method is feasible and effective for the reliability allocation of CNC machine tools.

Abstract: To determine the angle and position in width direction of canted deck objectively, this paper analyzed the factors that influence the angled deck general arrangements. Principal component analysis was introduced to determine the essential factors which influence the general arrangement of canted deck. Based on several flight deck schemes of foreign mature aircraft carriers, support vector machine was introduced to regression and gain the characteristics of canted deck arrangement. The training result gained by support vector machine algorithm is more accurate than other regression methods. The regression for former Soviet Union Ulyanovsk aircraft carrier demonstrates that the accuracy and validity of this method is good.

Abstract: The finite element analysis was carried out on the piston of WWD - 0.8/10 type air compressor under the action of mechanical load stress and deformation.Using three-dimensional modeling software Solidworks to establish a simplified geometric model of piston in air compressor ,Transform the model built in the three dimensional finite element analysis software into the finite element model for analysis,Determine the method of the piston by the mechanical load and boundary conditions,Completed the stress analysis and deformation analysis of the piston under the mechanical load ,The results of analysis of the piston design optimization has important reference value.

Abstract: The paper uses the preprocessor of ANSYS to generate the model of 3D entity and mesh generation on WW0.8/10 air compressor crankshaft. Mesh generators are transferred into data that will be used in finite element analysis. Passing by dealing with force and commitment, it calculates the forces of pressure working conditions of crankshaft. They are used in stress analysis. The stress data is calculated from the calculator of ANSYS. The static load safe coefficient and the fatigue safe coefficient of the crankshaft are tested from known stress. The result provides a high reference value for the optimization improvement of the crankshaft.

Abstract: The built-up large-span cable-stayed bridges are taken as the engineering background Integrated finite element analysis for whole bridge is applied to establish finite element model of calculative reference bridge . General finite element project is adopted to establish space finite element model for the full bridge, calculate its dynamic characteristics, combine other same types’ theoretical calculation, and analyze the dynamic characters of this kind of bridge, which provide references for the earthquake-resistant and wind-resistant design of this type of bridge.

Abstract: This paper proposes a new idea about damping of suspended floor in huge frame constructions. By using mode-superposition response spectrum method, the inner force and displacement in theory was obtained. Suspended floor system has economical, theoretical, social and humanistic benefits, but is not mature technically. Thus in the end, the paper proposes subsequent researching directions about damping of suspended floor system based on the basic assumption in the program.

Abstract: This paper proposes a new idea about damping of suspended floor in huge frame constructions. Experimental program and physical models were made, and then a lot of vibration tests by controlling acceleration and amplitude were taken respectively. The result shows that suspended floor has damping effect in a certain area and the damping degree is related to acceleration and amplitude. It also illustrates that changing frequency has more remarkable effect than changing amplitude.

Abstract: On the premise of the simulation data for the inner fuild passing the elbow pipe by means of software named FLUENT and dimensional analysis, the formula modle of inner surface pressure for elbow pipes came up by analyzing the relationships among the inner surface pressure P ,the fluid outlet pressure P₀ ,axial angle α, circular angle β and the degree of curvature k; Depending on the inner surface pressure data simulated under 150 kinds of conditions, the pressure formula was fitted by means of 1stOpt software; The verification results show that the calculated value by the formula matched with the value of simulation by FLUENT software very well, the maximum relative error was 0.004%, and the research conclusion layed the theoretical groundwork for the design of the high pressure and high velocity elbow.