作者: Kuo Jao Huang, Wen Ruey Chang, Wun Chuan Lian

摘要: To increase volume displacement is always concerning in designing external gear pumps
(EGPs). Therefore, an approach of optimization analysis intending to enhance their displacement
capability is proposed in this study. Through that, design parameters of the spur gears in the pumps are
systematically resulted to achieve their optimal volume displacements. Parametrically, a CAD model
to visualize the designed gear of the optimal design is also created. Firstly, the study derives tooth
profile equations by using the coordinate transformation and equation of meshing for gears on a rack
cutter profile. Then, an analytic formula represented the enveloping area by an involute curve is
derived. Next, volumes of output and trapped backflow of the EGP are achieved. Therefore the net
output volume can be calculated accurately and efficiently. After that, the optimization analysis to
maximize the volume displacement is performed. Through that, optimal design parameters for the
pumps are achieved under assigned constraints for considerations of design and manufacturing.
Additionally, influences of module, pressure angle, and addendum correction factor for the gears in
the pumps on their displacement capability are also investigated. Additionally, flowrate fluctuation
characteristics under different pressure angles of gears are finally discussed.

57

作者: Ya Juan Chen, Xin Chun Shang

摘要: With regard to viscoelasticity, we can’t use elastic-viscoelastic corresponding principle in quasi-static situation in view of dynamic response. In allusion to compressible materials, basis equations were applied, and constitutive equations were applied in convolution form, we derived the equations with which displacement function was satisfied, the displacement solution and stress expression in image space were derived by Laplace transforms. We discussed boundary value problems on the condition of the given displacement on the inner surface of the spherical shell, and the solutions were verified in calculating example.

6007

作者: Jun Jie Wang, Liang De He, Zhi Ming Zhang, Zhe Jiang Li

摘要: When the wharf structure is completed, the temperature is different with the one at the usage period. The temperature difference will lead to the temperature strain, and create the lateral deformation and internal forces of the piles. Based on the assumption of the free temperature difference of beam-slab-system, the spatial simplified calculation model of the foundation pile and the stiff platform about the temperature stress in all-vertical-piled wharf is first proposed, the related calculation method is also given. The numerical example shows that the accuracy of this simplified method could meet the demand of preliminary design. In order to reduce the pile-top internal forces, the foundation piles should be arranged symmetrically. The pile-top internal forces are in direct proportion to the forth power of the pile diameter, with the increase of the pile diameter in all-vertical-piled wharf, the analysis of the temperature stress must be taken seriously.

503

作者: Sifeddine Abderrahmani, Toufik Maalem, Abdallah Zatar, Djamal Hamadi

摘要: The purpose of this paper is to present the formulation of a new sector finite element based on the strain approach for the numerical analysis of circular thin plate bending. The element is named SBSPK and has four nodes and three degrees of freedom per node (3 d.o.f./node). From several numerical examples, it is shown that convergence can be achieved with the use of only a small number of finite elements. The results obtained are compared with analytical and available numerical solutions.

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