Advanced Materials Research Vols. 694-697

Abstract: This paper mainly makes comparative analysis on four main types of blade in stirred bioreactor by Computational Fluid Dynamics(CFD) simulation. Firstly we establish simulation method suited for stirred bioreactor, then simulate the velocity and shear force of flow field in the bioreactor. No matter from flow field mixing or shear force aspect, Elephant Ear blades is the most suitable for cell large scale culture. At last, it optimizes the installation method and angle of Elephant Ear blades. It concludes that anticlockwise rotation and 45°installation angle is the optimum.

Abstract: Railway ballast tamping operations is an important work in the line maintenance and repair operations. The main goal is to restore the correct geometrical position of the railway track and improve the ballast compactness under the sleepers. Tamping parameters has a very important influence of tamping effect. This paper takes the type D09-32 tamping device as an example, introduces its structure and function, and analyzes its tamping principle of asynchronous constant pressure. The main motion parameters of tamping operation are gained by analyzing and calculating the motion of tamping tine.

Abstract: It will be to bear several forces when Human Occupied Vehicle (HOV) moves underwater, So the movement performance forecast and research becomes more difficult when HOV under environment disturbances,this paper regards a certain HOV as the research object,researches the HOV actual situation, the comprehensive consideration of the hydrodynamic force, gravity, propeller thrust, environmental interference force for HOV motor effects, establishes the six degrees of freedom equations of motion for HOV, several typical motion states are studied , finally the simulation work is carried out, the simulation results can reflect the HOV motion characteristics , provide important basis for HOV motion control system design.

Abstract: The static tensile test and the Finite Element Model (FEM) study of the flange repaired cut-out laminates were carried out in this work. The tensile test is focus on the strength of the flange reinforcement panel and unreinforced panel. The FEM studies on the reinforcement and unrepaired structure is focused on simulation of the tensile test. The test results indicated that the strain value decreased as the size of load is. The FEM results indicated that the maximum Mises stress value of the flange repaired panel is decreased by 16.08% than the unreinforced.

Abstract: This paper proposed a construction method of the adaptable dynamic design platform based on CAX / PDM system. The method includes three main stages: the establishment of adaptable design service platform, trace dynamic design, variable design and optimization. In addition, a PDM server should be erected as the ties of the whole platform. The platform can be applied to other manufacture industries and reduce the waste of resources. This method can accumulate the experience of redesigning and manufacturing. The seamless integration of data transformation, product designing, analysis, simulation and manufacturing is available. The ultimate goal is the optimization and deformation acceleration of target product.

Abstract: The bending deformation problem of cantilever micro-beams is solved analytically on the basis of strain gradient elasticity theory. The governing equations and boundary conditions are obtained by using Hamiltons principle. The size effect on deflections of the cantilever micro-beams is analyzed. It is found that the deflections of the cantilever micro-beams predicted by the newly model are size-dependent. The difference between the natural frequencies predicted by the newly established model and classical beam model is assessed.

Abstract: Considering the instability of the direction dynamics of tank vehicle system under braking maneuver, the longitudinal equivalent model of liquid was formulated with consideration of both the steady-state and the transient state dynamics of the liquid. The Matlab/simulink program of the liquid was built and was combined with the vehicle model in Trucksim software to simulate and analyze the motion of the liquid cargo centroid and its dynamical effects on the vehicle under braking maneuver. It is observed that the liquid cargo slosh motion in tank vehicles has significant influences on braking performance, pitch motion and perpendicular motion of the vehicle. The results of this paper have significant help for studies on dynamics of vehicle tankers under braking maneuver and ensurement of braking stability and security.

Abstract: Dynamic properties of mechanical joint surfaces are researched, majorly contains the study of basic mechanism and factors affect the dynamic properties of joint surfaces. Equivalent stiffness and damp are analyzed. Orthogonal experiments are arranged in order to analyze the weight of every major factor that affects the joint surfaces dynamics. Two common materials HT200, 2Cr13 under different processing methods, surface roughness and surface areas are used.

Abstract: The vibration deformation problem of vehicle frame directly affects the safety and comfort of whole vehicles. In order to fully understand the dynamic properties of vehicle frame, a finite element model for vehicle frame is established and the natural frequencies of vehicle frame for free working conditions are solved. Compared to the actual excited frequency of matched engine running in the idle speed, some instructive suggestions are given. Those results can be helpful for improvement and optimization of the vehicle frames.

Abstract: The transmission laser-scanning diameter-measurement system uses the parallel laser-scanning principle to achieve high-precision measurements of radial dimensions of shaft parts. The transmission laser-scanning emitter is a mechanical scanning device of which scanning accuracy has a significant impact on stability of the measurement system. The dynamic model of the emitter's shaft rotor is established. Dynamic performances according to variant parameters are derived by finite element analysis simulation. Characteristics of high-speed-rotors with different structures, such as vibration mode and natural frequency, are summarized to provide theoretical basis for shafting design.