Advanced Materials Research Vols. 889-890

Abstract: The Laser Doppler anemometry was employed to determine quantitatively the liquid velocity induced by the successive rising of single bubble in non-Newtonian carboxymethylcellulose (CMC) aqueous solutions under various experimental conditions of mass concentration solutions, measures heights and gas flow rate. The features of liquid motion in the region of bubble rising channel were investigated by analysis the liquid velocity pulsation using fractal theory. The results show that the liquid motion in the channel zone of bubble rise has a special feature of double fraction, and shows strong positive persistence characteristics for a small delay, but the positive persistence characteristics begins to reduce obviously with the increase of the delay, and even presents the anti-persistence for some measured points.

Abstract: Hydro turbine generating sets vibration is an important factor affecting the safe operation of hydropower stations. The research on the vibration characteristics is basic for the unit structure design, control design and hydropower station powerhouse structure optimization design. Based on built transient model of the hydropower turbine generating sets shafting, this paper constructed the whole hydropower turbine generating sets operating system by combine the hydro turbine, the generator object model, the governor and the excitation controller. Using numerical simulation method to obtained the shafting vibration data under different operating conditions. And then used Prony algorithm to extract the oscillation characteristics of amplitude, frequency, attenuation factor and phase angle from the vibration signal of hydro turbine generating sets shafting parameters. The simulation results show that the proposed method is effective.

Abstract: The main objective of this paper is to establish a class of new nonlinear Volterra-Fredholm type difference inequality. Upper bound estimations of unknown functions are given by technique of change of variable, amplification method, difference and summation and inverse function. The derived results can be applied in the study of solutions of Volterra-Fredholm type difference equations.

Abstract: Frame theory plays an important role in field of the engineering and technology because of their redundancy properties. In this paper, symmetric fusion frames with several generators are constructed from any fusion frames given, which generalizes the existing result to the case of several generators. This way makes the amount of wavelets largely increase.

Abstract: In this paper, two discrete inequalities with iterative summation are discussed. By technique of change of variable, comparison principle, amplification method, difference and summation, upper bound estimations of unknown functions are given. The derived results can be applied in the study of solutions of difference equations.

Abstract: In this paper, we present a new algorithm for the signal design in radar whose function is oil spill segmentation, using the minimum description length (MDL) principle and a polygonal active grid. This algorithm is based on two steps: a first partitioning step into homogeneous signals and a second classification step with an automatic thresholding. The obtained method allows one to find a optimal signals for radar.

Abstract: A simulation optimization of a two-cavity injection molding for the bottle cap was studied. It included the preprocessor of the model, scheme one which used a series recommended parameters from Moldflow software. Though the result could meet surface quality requirements, the mold structure was too complicated especially the channel. The deformation of different factors were analyzed and uneven cooling had little effect on the deformation. And some relative heat condition equation were used to calculate the channel number. Therefore the optimized scheme two was put forward. According to the cooling circuit and deformation factors, the channel number was greatly reduced. After the simulation, scheme two could also meet surface quality requirements. At the same time, the mold structure can get simplified.

Abstract: FTA^e is software tool for Fault Tree Analysis in Microsoft Excel. This paper is focused on short description of created FTA^e. A brief description of Fault Tree Analysis is in the first part of paper. The Structure, Logic and Minimal Cut Sets in Fault Tree analysis is described too. Next part of this paper is focused on the choice of algorithm for cut set calculation and brief description of structure of FTA^e. Finally, advantages of FTA^e software in Microsoft Excel are described in conclusions.

Abstract: In this paper firstly a new hypothetical model of bone remodeling based on bone bioactivity mechanism and Turing reaction-diffusion equations is presented. Secondly this model of bone remodeling is translated to material formation and resorption process of continuum structures, a new heuristic structural topology optimization is presented. Finally short cantilever beam problem, one of the widely used examples in structural topology optimization are carried out by using present method to confirm the validity of the proposed topology optimization method.

Abstract: With analyzing the shortcomings of "Success Tree" method, the article proposed two new algorithms which base on the basic principles of Boolean algebra and Fussell determinant method respectively to replace the "success tree" method to solve the minimum path sets of fault tree. Combined with the simple and the complex examples' results, the correctness and effectiveness of new algorithms were verified. Especially for the large and complex fault trees, the solving process of these new algorithms can be simplified sharply. Furthermore, the new algorithms could provide the algorithm support for the realization of quantifying the qualitative analysis, modeling the quantitative analysis, and computerizing the model analysis.