Applied Mechanics and Materials Vols. 444-445

Abstract: On the basis of plastic-elastic mechanics and finite element method, one selected 150m high reinforced concrete chimney was taken as the target in this paper to analyze the mechanical condition of directional demolition blasting, the capsizing time, the internal force of support abutment and constitutive relation of the chimney during directional blasting. A finite element model of the towering reinforced concrete chimney was established through separated modeling method by finite element analysis software LS-DYNA of ANSYS. Results show that the constitutive relation given by this paper conforms to reality. The finite element model of the towering reinforced concrete chimney established by separated modeling method is reasonable. The real overturn process, capsizing location and capsizing length of towering reinforced concrete chimney during directional demolition blasting are agree with that of numerical simulation.

Abstract: For the prefab fragments, firstly, according to the requirements of focusing regions and width at the lethal radius ,the method of pushing down has been used to design the shape of charge curve of the double focusing warhead initiated in the center of the warhead. Then, the warhead with this charge curve designed has been simulated by AUTODYN-3D.The results show that the charge curve designed which is divided into several independent arcs could satisfy the focusing effect. The design method is of great value to the engineering design for other kinds of warhead.

Abstract: In this paper, a new test nodes selection technique based on the complex field fault modeling of analog circuits testability is presented. The function F () by the complex field fault modeling can be used as the fault model, which is applicable to both hard (open or short) and soft (parametric) faults. Therefore, we can obtain the signature curves of the potential fault components by PSPICE and MATLAB. For the testability of fault model, fault-test dependency matrix can be concluded. With the integer-coded fault-wise table method and heuristic graph search algorithm, we can obtain a global minimum node set. The number of potential faults with complex field fault modeling is half compared with the traditional methods and the time complexity of the circuit can be reduced significantly.

Abstract: The purpose of this article is to achieve pure water hydraulic sync system urn of synchronous control by using two-way cartridge valve integrated logic brick as a main valve.Through making the cartridge valve, hydraulic cylinderand proportional speed regulation valves mathematical modeling,and the theoretical dynamic simulationusing the MATLAB software,the system can realize the accuracy of synchronous control with PID control, and put forward feasibility of the cartridge valve in the water pressure urn synchronous control and the problem in the actual application.

Abstract: Based on the transient model of hydro turbine generating sets (HTGS), the integrated simulation system of HGTS is built to study shafting stability. Given different bearing stiffness, equivalent damping coefficient and mass eccentricity, the change characteristics of shafting vibration at rated angular speed in steady and maximum angular speed in transient are simulated, and which are applied to study inferences shafting parameters and angular speed on shafting vibration. Simulation results show that the relationship between shafting vibration amplitude and angular speed is linear. however, the vibration amplitude increment produced by angular speed error will be amplified while the shafting stiffness is weaker, mass eccentricity of the runner and rotor is larger.

Abstract: Purpose: The aim of this study is to contrast the coupling algorithm (CEE) and boundary heat exchange coefficients (Nu) used in treatment of the large blood vessel in thermal ablation. Methods: Based on the Pennes bioheat transfer equation, the models with blood vessel parallel to microwave antenna were built with finite element method. In two kind of simulation, blood flow rate was set in 0.2 m/s or boundary heat exchange coefficients was set in 1750 W / (m2 °C), respectively. Results and conclusions : There was no significant difference on shape of effective ablation areas and 54°C temperature contours by using two kinds of simulation methods, especially the place far away from the blood vessel. At the place near the blood vessel, the method of CEE is closer to real condition which considers directivity of blood. Whats more, there are higher temperature by using method of Nu inside effective ablation areas.

Abstract: A regulatory network of G2/M phase transition influenced by different intensities of DNA damage is modeled. It contains the sub-modules of P53-Mdm2 feedback loop and G2/M phase transition process. To investigate the robustness of the regulatory network, a sensitivity analysis of kinetic parameters in the proposed mathematical model is implemented to select the most significant kinetic parameters, which are relevant to key proteins involved in G2/M phase transition. Subsequently, the statistical hypothesis testing is employed to evaluate the influence of perturbations on the G2/M regulatory network. The results indicate that G2/M regulatory network is robust to DNA damage signal when perturbations are very small that is consistent with the experimental observations.

Abstract: In Guangdong MeiHe highway K28 + 360 ~ + 360 section of the steep slope embankment as the research object, by adopting the combination of measurement and numerical analysis methods, analyze the failure process and mode of steep slope embankment. Based on the analyses, The following conclusions were obtained: the sliding surface of fill embankments on slope foundations of K28+360~+860 section was the original surface of the slope. Constructions of the highway would block the groundwater discharge and reduce the strength of the original surface of the slope, which would cause the slide of the fill embankments on slope foundations.

Abstract: SapTis is a software of simulation and nonlinear analysis of complex structures which based on the FEM method, this paper discussed the key technology of FEM parallelization and then the parallelization strategy of SapTis is given; There are three realization for the SapTis parallelization:Make fine grain parallelism to the PCG solution on the OpenMP platform; the other Krylov subspace method solutions and preconditioners was developed on the MPI platform; the sparse direct solutions was developed on the OpenMP platform. Test results show that there are high efficiency of the three parallel realization for SapTis, and each had its own characteristics. In addition, the GPU solution is still in development which will make the SapTis software more powerful, flexible and adaptable.

Abstract: To analyze the dynamic response of the pavement structure under moving vehicle loading is always a hot point in pavement engineering. In this paper, the moving vehicle has been simplified as spring-dashpot components and the pavement structure has also been discrete using three-dimension finite element model. Based on Newton iteration and central difference integration algorithm, the static and dynamic coupling reactions between pavement structure and vehicle have also been considered using finite element platform ABAQUS. The numerical results and analytic results can fit very well in static analysis, meanwhile the numerical results and experiment results can fit very well in dynamic analysis. Based on preceding verified numerical model, a few interesting phenomenon have been discovered. The pavement dynamic vertical displacement in upper layer is much higher than the situation in static analysis, because the vertical displacement is superimposed during the dynamic response analysis. Furthermore the vertical fluctuation of the vehicle's bar center exists even the vehicle moving in the initial even pavement, and the inertial forces is the most important reason to induce this behavior. In the last, this paper has proposed a more accurate, fast and concrete evidence to explain the reason that the dynamic response has obvious relationship with the diseases in pavement layer.