Advanced Materials Research Vol. 422

Abstract: According to the processing and control requirements of precision CNC internal grinder, a design of ARM-based embedded precision CNC internal grinder soft-PLC system was proposed. The design idea of embedded system hardware and software components was introduced to develop the PLC applications, achieved the logic control of the machine tool. This design meets the requirements of software design instead of hardware design and system integration of embedded CNC system development and it also meets the requirements of modular design of open CNC system development.

Abstract: Heat exchanger of Sleeve type was used in the experiment with water for working medium, hot water inside of tube, cold water outside of tube, For ring gap of 0.50mm~2.50mm, Reynolds number range in 7000, the heat transfer characteristics of the fluid of narrow annular channel was made by doing experiments and study. According to the result of the experiment, heat transfer coefficient and Reynolds number of function relation curves of Re-and Re-K are made. It was found that narrow ring channel has the remarkable strengthening effect with compact structure. Decreasing of the narrow gap dimension, the heat transfer coefficient increases.

Abstract: For a blood pump, the injury to blood is a very important index of its performance. The strongly swirling turbulent flow in the internal flow field of a high-speed spiral blood pump(HSBP), is one of important factors leading to the fragmentation of the red blood cell(RBC) and the hemolysis. The study on the turbulent injure principle of blood in the HSBP is carried out by using the theory of the turbulent flow field and the hemorheology. The determinant gist on RBC turbulent fragmentation is obtained. The turbulent flow in the designed HSBP have been simulated and analyzed by using the multiphase suspend body CFD simulation technology. The simulation results indicate that the turbulence in the designed HSBP can meet the requirements of blood physiology.

Abstract: This paper presents a color image noise removal technique that employs a cellular neural network (CNN) based on hybrid linear matrix inequality (LMI) and particle swarm optimization (PSO). For designing templates of CNN, the Lyapunov stability theorem is applied to derive the criterion for the uniqueness and global asymptotic stability of the CNN’s equilibrium point. The template design is characterized as a standard LMI problem, and the parameters of templates are optimized by PSO. The input templates are obtained by employing the CNN’s property of saturation nonlinearity, which can be used to eliminate noise from arbitrary corrupted images. The demonstrated examples are compared favorably with other available methods, which illustrate the better performance of the proposed LMI-PSO-CNN methodology.

Abstract: In insurance mathematics, a compound Poisson model is often used to describe the aggregate claims of the surplus process. In this paper, we consider the dual model of the compound Poisson model with multi-layer dividend strategy under stochastic interest. We derive a set of integro-differential equations satisfied by the expected total discounted dividends until ruin. The cases where profits follow an exponential distributions are solved.

Abstract: As for the pulp-mixing process of small mineral, its flow field configuration principle is to obtain effective cycle in the same operating condition, and allocate strong shearing action according to the needs. This paper takes the coupling of secondary circulating flow pattern as the basis of flow field design to construct the double-impeller function system with the common effects of axial flow impeller and radial flow impeller, thus forming the high-efficient functional mechanism merging strong cycle and strong shearing together. It shows in the result that the effect of double-impeller configuration is strengthened compared to the conventional single-impeller pulp-mixing process: the decrease range of mixing time can reach about 50%; shearing mechanism has effectively blended in the related flow field, and achieved improvement on this basis. It means that the double-impeller configuration has respectively made up the shortage of the cycle performance in the single-impeller radial flow field and the shearing performance in the single-impeller axial flow field, initially formed the mixing mechanism characterized by high-efficient strong cycle mixing and high shearing mixing, and provided practical foundation to develop new and high-efficient modified pulp-mixing equipment.

Abstract: Regarding double block ballastless track as research subject, three mechanical models were established, which include steel bar and concrete interaction mechanical model, spatial finite element static model of double block ballastless track, train-double block ballastless track vertical coupling dynamics model. According to concrete and steel bar stress time-dependant curves under axial even temperature and shrinkage load, temperature grads load and train load, fatigue load spectrum under coupling loads was obtained by using rain-flow counting method. Based on steel bar and concrete S-N curve, and Palmgren-Miner linear fatigue damage accumulation rule, track concrete layer fatigue life predicting model of double block ballastless track was established. Taking Changsha climatic condition for an example, the fatigue life of double block ballastless track is predicted, and the effects of design parameters to fatigue life are analyzed.

Abstract: The numerical simulation can be obtained by taking advantage of turbulence model of Fluent to study the gas-solid flow field of cyclone separator. The pressure of the cyclone drops increases with the enhancement of the inlet flow velocity, and the increase amplitude can become larger and larger. The separation efficiency of the cyclone enhances gradually as the increase of the flow. The increase amplitude of small and secondary particles is much lager compared with the increase amplitude of big ones. The overall separation efficiency can strengthen gradually with increasing of particles concentration as well as the each part’s efficiency. But the separation efficiency will stay in stable level when the concentration reaches a certain value with the big particles in the low concentration and small ones in a relatively high concentration.

Abstract: The essay aims to put forward diverse suggestions on how to restore the urban river ecosystem from the perspective of design, and gives a brief description of eco-design and recommends ways to make long-term ecological management.

Abstract: Now human error has caused lots of accidents of hydropower station home and abroad, but there is no direct method to calculate the probability of human error in accidents of hydropower station. So the paper invite the suggestion of introducing the human reliability into hydropower station risk analysis, which can perfect the hydropower station risk theory. It used improved HCR(Human Cognitive Reliability) method to calculate human reliability of hydropower station , but the concrete parameters need further research combined with engineering practice.