Applied Mechanics and Materials Vols. 303-306

Abstract: Firstly, FEA model is established to analyze strucural strength of clutch hub assembly according to the company standard and test requirements document. And then the result of FEA is obtained. During strucural strength test of clutch hub assembly, five test pieces are chosen. Bench test of it is finished with principle of work. The failure mode of all test pieces happens at welding line between clutch hub and inner tower. After the results of FEA and bench test are studied, the conclusion can be reached that simulation curves are similar to test curves. Finally the clutch hub supplies the demand of design.

Abstract: The internal resistance of the six Ni-MH batteries are obtained by experiment, furthermore get resistance curve using polynomial fitting method. This article commits itself to take the variation of the operating conditions into account to obtain the overall temperature rising curve and the temperature profile based on battery thermal model. The temperature rising results under different battery resistance models (R=C and R= f(t)) are compared. It is useful to provide basic reference for further study in Ni-MH battery heat generation characteristics and the improvement for battery thermal management.

Abstract: Based on the analysis of the structure and the characteristic of the existing water injection faucet, a new type of adjustable water injection faucet is developed this article. The article introduces the structure, principle of the new adjustable water injection faucet and analysis and establishes the design calculation model with the relevant performance tests.

Abstract: The hot power backward spinning(HPBS) of the high strength cast aluminums (HSCA) cylinder is a complex metal forming process. To analysis the plastic deformation of HSCA cylinder in HPBS process, a 3D coupled thermo-mechanical FE model of the process was built under the ABAQUS/explicit environment based on the solution of several key techniques, such as heat boundary condition treating, material properties definition, ALE adaptive meshing technology, etc., and verified by theoretical evaluation. Then simulation and analysis of HPBS of the process were carried out. The results show that the strain gradient which leads to the serious inhomogeneous deformation is produced in the thickness direction of the workpiece during the process.

Abstract: Through the environmental pulsating measure in a 1.5 MW wind generator tower drum in Inner Mongolia wind farm , modeling and modal analysis of tower drum are finished with the ANSYS finite element software, and compared with the field measured results, the difference is in the allowed ranged. Proper interval exists between numerical simulation and data obtained from the wind generator tower drum inherent frequencies and blade rotation excitation frequency , which meets the standard design requirements of《Wind power generation unit tower》.

Abstract: It is proved by theory and experiment that the arrival time of elastic scattering wave is determined by group velocity of Lamb wave in plate and the speed of elastic scattering wave in water. The frequency dispersion equation of Lamb wave is derived for submerged elastic plate, and the phase velocity and group velocity dispersion curves are obtained by numerical calculation method. It is found that the phase velocity is greater or less than the group velocity at different frequency-thickness products. The energy propagation speed of wave is group velocity, so the arrival time of elastic scattering wave is determined by group velocity of Lamb wave in plate and the speed of sound in water. Experimental results show that elastic scattering wave is ahead of or behind the edge wave in echoes of elastic steel plate. The experiment results confirm validity of the theoretical analysis results.

Abstract: An ultrasonication system for cells disruption is developed to extract nucleic acid from cells. The structure and operating principle of the ultrasonication system are explained, after which the key problems are stated. Based on finite element modal analysis, the top-ten natural frequencies of the round-shaped vibrating diaphragm are found having a character of stepped distribution, which can be divided into three grades. To optimize the vibration performance of vibrating diaphragm, simulation based on ANSYS is performed, the results of which show that medium grade frequency decreases with the increase of diameter while increases linearly with the increase of thickness.

Abstract: It is essential to investigate the vibration properties of piping system in air conditioner. Finite Element Method is used to build the virtual prototype model of the air conditioner, and the dynamic responding analysis was conducted using ANSYS software. The modal analysis and harmonic response analysis was conducted for different modals and the results was compared. The simulation results showed that the vibration characteristics of modified model is better than that of the original model, thus resonance phenomenon could be avoided.

Abstract: The nonlinear dynamical equations are established by using the method of quasi-shells for three-dimensional shallow spherical shells with circular bottom. Displacement mode that meets the boundary conditions of fixed edges is given by using the method of the separate variable, A nonlinear forced vibration equation containing the second and the third order is derived by using the method of Galerkin. The stability of the equilibrium point is studied by using the Floquet exponent.

Abstract: The paper presents a semi-implicit time-stepping Taylor-Galerkin pressure correction primitive variable finite element algorithm to simulate fluid flow for two dimensional planar combined mixing and separating geometry. Two cases; one with reversed channel flows interacting through a gap in the common separating walls filled with Newtonian fluids in both arms of the channels and other with unidirectional flows were modeled in order to examine the performance of the scheme. Steady solutions were obtained using unsteady finite element scheme. The influence of increasing inertia on variation in flow directions and varying flow rate configurations in both channel arms are studied in detail. The scheme is found to be fast, robust and stable for varying Reynolds number.