Advanced Materials Research Vols. 308-310

Abstract: In order to determine the normal force acting on the TBM disc cutter, a 3-D FEM model is established to simulate the cutting process, with the failure effect of the rock. Afterwards, by using this model, a series of numerical simulations are performed. Based on the numerical simulation results, via modifying Evans formula, an improved formula is given. The modified formula indicates the relationship between the normal force acting on a single disc cutter and the penetration depth, and contains the influence of formation stress and wear.

Abstract: During the modern product design, CAD softwares are widely used for geometric modeling and finite element method is used for structural performance analysis. Plenty of designers’ working time is spending in the pre-processing work of finite element analysis. Boundary Element Method(BEM) has been studied in recent years to analyze 3D elastostatics instead of Finite Element Method(FEM) because of the decrease of unknowns and easier mesh generation process. But the calculation amount of BEM is large, especially for the coefficient integrals and system equations solution. In this paper, we present a Boundary Element parallel computation technique for 3D elastostatics using Computing Unified Device Architecture (CUDA) that runs on GPU. Furthermore, we propose GMRES-DC (GMRES with Dual Compensation) algorithm based on the classic GMRES algorithm to gain a higher solving efficiency. The examples show that the GPU parallel implementation in this paper can accelerate BEM computation greatly, and the GMRES-DC algorithm can solve the BEM system equations efficiently.

Abstract: Based on the ANSYS Software the Ho-type cutting pick of Spiral Drum Shearer applied lasers coating is feasible analysis. At first the paper describes the Spiral Drum Shearer’s overall body and elicit to its traditional materials. Then analysis the head of Cutting pick’s traditional materials in order to apply with lasers coating. Then simulate it and Fatigue calculation by ANSYS Software. By analysis of the coating pick is found that the Cutting pick’s life can develop well. So it has a nice economic Potential.

Abstract: According to main factors which affect the design of a composite impeller with ultra-low Unit speed centrifugal pump—the leaf number of the composite impeller’s short blade design, the relative position of the blade’s radial inlet, the bias degree of the blade’s circumferential direction, the deflection angle and so on. The paper applies Orthogonal method and establishes 16 design schemes. The preferentialness design of Composite Impeller’s short blade with ultra-low unit speed centrifugal pump was gained by numerical simulation. Contrast to the method of permutation and combination, this kind of method can decrease the designer’s workload greatly. As the results show, the composite impeller’s inner stress field and velocity field distribute reasonably, H - Q curve method is smoother, curve directs to large discharge and the work performance becomes well by applying orthogonal method.

Abstract: The natural frequencies and deformation of the prestressed spindle component assembly are separately analyzed by means of ANSYS workbench software in this paper. The results show that the structural parameters have large influence on spindle inherent frequency, it is important to optimize the design structure to make the inherent frequency of the spindle away from work frequency.

Abstract: Study on the flexible structural shape optimization problem under dynamic loading conditions. The dynamic loads are transformed to equivalent static loads (ESLs), and then the static response optimization can be used for dynamic response optimization. A structural shape optimization model, which has been established by ESls method, is utilized to design the flexible components in the multibody dynamic system. A shape optimization for a four-bar linkage had been generated by using the ESLs method, and the results indicate that there are noticeable improvements in the total mass and the maximum stress.

Abstract: The project Expo Axis is one of the landmark buildings of Expo Shanghai 2010, and its structural safety depends largely on the security of the six Sun Valleys, which are the important components of the Expo Axis. The simulation of the whole process of collapse and collision of the sun valley under earthquake action is conducted in this article. In the calculation multiple nonlinear factors are taken into account, such as material nonlinearity, large displacement effect, self-contact collision among the structure members, contact collision between the structure and the ground, etc. Through analyzing the results, a reasonable assessment of the structure of Sun Valley’s performance under the supper-large earthquake is given out. This method can also offer reference to other similar large-span steel single-layer lattice structure’s performance analysis.

Abstract: Most of the component optimizations of trucks are limited to the individual component because of the complex coupling relations between components. Focusing on such difficult optimal problem, the conception of static modal stiffness was introduced and static modal stiffness sensitivity was defined. The method for computing static modal stiffness sensitivities was also developed. The proposed method was applied to the static modal stiffness sensitivities analysis of the frame of the truck under full vehicle environment. In the computations, a three dimension finite element model for full vehicle was established and the frame was divided into 13 superelements. The static modal stiffness sensitivities obtained can be used to improve the frame design.

Abstract: In emergency braking conditions, because of a large acceleration, the passenger will lose his balance to come in collision with the bus bodywork. In some typical positions, without the side effect of seat belts or baffle, the key parts of a passenger body will come in direct collision with the bodywork internal, even to be accompanied with secondary collision, which causes a great threat to human’s life safety. This paper cares for the front bus position. Based on the collision simulation between the model of child passenger and the bodywork structure, by analyzing the initial point of impact, secondary point of impact and other key information, and combining the damage indicators-time curve of the collision of the dummy model which determines the peak injury index of a passenger, the injury in emergency braking situations can be simulated. According to the pattern and level of injury imposed on the body of a child, an improvement can be proposed for the design of the internal structure of the bodywork. The simulation after improvement of design shows that the head HIC value of a child dummy has a great reduction compared with before. So this improvement can fully reduce the risk of injury of children passengers.

Abstract: To improve the design analysis efficiency of the high-pressure reciprocating pump, the study adopted a kind of visual programming software and programmed the CAE system software of the high-pressure reciprocating pump. The sortware developed three modules in correspondence with three aspects, namely, the analysis of power end’s motion theory, the analysis of the hydraulic end’s suction and discharge process, and the finite element analysis of the structure and the analysis of fatigue life. It is proved that the system software has a friendly interface, easy to operate and highly precise, providing a powerful professional tool for analyzing suction and discharge performance of the high-pressure reciprocating pump.