Applied Mechanics and Materials Vols. 101-102

Abstract: Reinforced concrete ribbed arch aqueduct’s bent is arranged symmetrically on the main arch, load which is transferred from bent to main arch is more homogenous. It can improve force conditions of main arch, and aqueduct is arranged on the bent. That also has the function of longitudinal beam. This paper adopts finite element method to carry out force analysis for Guanping reinforced concrete ribbed arch aqueduct, considering aqueduct weight, water pressure and earthquake effect, etc. researching stress and deformation distribution law of reinforced concrete ribbed arch aqueduct.

Abstract: Spiral case are important diversion parts of reaction type wheel, this paper adopts finite element method to carry out simulation analysis for spiral case structure of Shuikou hydropower station. Considering five calculation schemes in analysis, under different thickness and materials of cushion, researching stress and deformation distribution law of steel spiral case and surrounding concrete. Analyzing bearing ratio of steel spiral case and surrounding concrete, Research results provides reliable reference for design and construction of steel spiral case.

Abstract: The force characteristic of Shahe prestressed U-shaped thin shell beam-supported aqueduct in operational process and stress or displacement distribution effects under variety load were studied. This paper adopts universal finite element calculation software to Shahe prestress U-shaped thin shell beam-supported rectangular carry out 3-D finite element analysis. Considering eight combination operating condition of the aqueduct in operational process, the stress and displacement rules of aqueduct structure is presented, and stress and displacement variation curve of aqueduct’s calculated path under various operating condition is drawn. Research results show that pedestrian load and wind load have less effect for stress and displacement of aqueduct, but water load has great effect for mechanical behavior of aqueduct, this also fully explain that water load has huge effect for aqueduct. The analysis result supply certain reference for design and construction of prestress U-shaped thin shell beam-supported rectangular.

Abstract: Aqueduct is a common water conveyance buildings, this paper adopts finite element method to carry out three-dimensional finite element simulation analysis for Gegou wire nets concrete U-shaped beam-supported aqueduct. Researching variation law of the aqueduct’s stress and displacement in construction process and operational process, the research results offer some reference for design and construction of wire nets concrete U-shaped beam-supported aqueduct.

Abstract: Reinforced concrete continuous box-girder overpass is a common structure form, Wangzhuang overpass is example, this paper adopts universal finite element calculation software to carry out finite element simulation analysis for reinforced concrete continuous box-girder overpass. Considering the influence of overpass structure weight and driveway load, the distribution law of overpass stress and displacement were researched. Analysis results show that, load’s short-term effect combination has great influence on overpass structure, driveway slanting load’s influence on overpass structure’s stress and deformation can not be ignored.

Abstract: This paper presents an improved interpolating moving least-squares (IIMLS) method, in which orthogonal functions system is used as the basis functions. In the IIMLS method, the final algebra equation system is not ill-conditioned, and can be solved without obtaining the inverse matrix. Hence, the computing speed and efficiency are improved. Then based on the IIMLS method, a meshless method is presented for the numerical solution of the regularized long wave (RLW) equation, which can be used to describe phenomena with weak nonlinearity and dispersion waves. And a numerical example is given to confirm the IMLS method.

Abstract: An improved element-free Galerkin method is presented for the numerical solution of the third-order nonlinear KdV equation by coupling the interpolating moving least-squares (IMLS) method with the Galerkin method. The shape function of the IMLS method satisfies the property of Kronecker Delta function, and then the essential boundary condition can be applied directly and easily without any additional numerical effort. A variational method is used to obtain the discrete equations. A numerical example is given to demonstrate the effectiveness of the method presented in this paper for KdV equation.

Abstract: In order to find out the influence trend and the impact factor of different process parameters for die-roll of gear shape and smooth-shear surface, the forming process to characteristics of FPG fine-blanking that based on fine-blanking theory was simulated by using Deform-3D. The best scheme suitable for FPG fine-blanking was obtained, which was also validated by the simulation test. The results showed that the processes were feasible and thus provided the basis to improve the die life and the forming quality for fine-blanking of FPG.

Abstract: The filling process, solidification process, gasification process and node temperature change of special-shaped stainless steel stirrer via lost foam casting was simulated and analyzed by using ProCAST numerical simulation techniques. The results show that the filling and foam gasification process of stainless steel stirrer casting is a top-down, from the middle layers of outward promotion process. In the filling process, foam pattern gasification and decomposition appeared to be exacerbated by heat transfer in the whole casting. Through the node temperature change over time, it can be conformed to the principles of the order of solidification in the entire stirrer casting solidification process.

Abstract: Two semi-online scheduling problems on two parallel identical machines under a grade of service (GoS) provision were studied. The goal is to maximize the minimum machine load. For the semi-online version where the largest processing time of all jobs is known in advance, we show that no competitive algorithm exists. For the semi-online version where the optimal offline value is known in advance, we propose an optimal algorithm with competitive ratio 2.