Papers by Author: Shu Zhang

Abstract: The standard Genetic Algorithm has several limitations when dealing with dynamic environments. The most harmful limitation as to do with the tendency for the large majority of the members of a population to convergence prematurely to a particular region of the search space, making thus difficult for the GA to find other solutions when changes in the environment occur. In order to avoid the premature convergence and the slow search efficiency at posterior evolutionary process of the traditional immune genetic algorithm, a new immune genetic algorithm is proposed. This algorithm uses orthogonal crossover to generate initial population and uses elitist-crossover to increase the good patterns of the population and uses hybrid mutation to increase the ability of local and global optimization. It has shown fascinating results when being used in the optimization of multimodal function.

Abstract: Artificial neural networks are composed of interconnecting artificial neurons (programming constructs that mimic the properties of biological neurons). Artificial neural networks may either be used to gain an understanding of biological neural networks, or for solving artificial intelligence problems without necessarily creating a model of a real biological system. First modal analyses of microstructure defects are performed in ANSYS. Second the genetic algorithm is implemented in MATLAB to Calculate the Value of b and p. The last, The FEM analysis results are imported in ANSYS about the Stress distribution. The result presented in this paper is obtained using the Genetic Algorithm Optimization Toolbox.

Abstract: Annealing evolutionary algorithm is a method optimization and hybrid the genetic algorithm and simulated annealing algorithm; it is the genetic algorithm has a strong grasp of the overall capacity, but also the algorithm using simulated annealing local search ability of stronger populations of genetic algorithm the probability of acceptance, to avoid the mature problem of genetic algorithm. Using γ'/γ ordered from a passage in the interface of the atom spread to another channel to analyze g raft form of fancies of ordered the width of the matrix channel with changes, thinks a photograph of the raft form at high temperatures of element diffusion occur. But the high temperature pull/pressure creep during different orientations of γ' phase happen, the rate of different raft form reason and in different orientations of single crystal alloy phase during the microstructure evolution ordered γ solute elements of the directional migration patterns are still unclear.

Abstract: Organizations can significantly reduce defects in single crystal nickel-based alloys and plastic creep life, with the creep for the alloy in the near hole region  bent along the direction of applied stress axis was 45 angle to form raft-like structure, the circular hole defects elongated along the stress axis into an oval, and the formation of cracks in the holes on both sides and along the direction perpendicular to the stress axis expansion. During the high temperature creep, stress region near the contour holes with disc distribution, along with the applied stress axis orientation angle of 45 have greater value, the stress distribution is converted to  phase angle of45 raft-like structure of the main reasons.

Abstract: We have used the metaphor of ant colonies to define “immune system”, a class of distributed algorithms for combinatorial optimization. In this paper we analyze some properties of immune-cycle, the up to now best performing of the immune algorithms we have tested. We report many results regarding its performance when varying the values of control parameters and we compare it with some FEM algorithms. And in accordance with treatment principles, the microstructure of the alloy is simulated.

Abstract: By means of measuring creep curves, microstructure observation and FEM analysis of the stress field near the hole; an investigation has been made into the influence of the defects on creep behaviors and microstructure evolution of single crystal nickel-based superalloys. Results show that the creep lifetimes and plasticity of the single crystal nickel based superalloys are obviously decreased by microstructure defects. During high temperature creep, the stress isoline near the holes region displays the feature of the acetabuliform distribution, and possesses the bigger stress value at 45 angle direction relative to the applied stress axis. Average interpolating scaling function is constructed with symmetric interpolating scaling function, and the two scaling functions are given the relationship between the derivatives, which provides a convenient approach for the interpolation, and greatly improve accuracy.

Abstract: High temperature pull/compressive stress creep, cubic  phase during the organization evolution and the direction and exert stress, two phase mismatch degrees about. Using ordered from a passage in the interface of the atom spread to another channel to analyze g raft form of farcies of ordered the width of the matrix channel with changes, thinks a photograph of the raft form at high temperatures of element diffusion occur. But the high temperature pull/pressure creep during different orientations of phase happen, the rate of different raft form reason and in different orientations of single crystal alloy phase during the microstructure evolution ordered  solute elements of the directional migration patterns are still unclear. Using immune algorithm to calculate the relevant after the coefficient, combined with finite element software simulate the alloy tensile creep. Experiments have gained good effects

Abstract: we have used the metaphor of ant colonies to define "the Ant system", a class of distributed algorithms for combinatorial optimization. In this paper we analyze some properties of Ant-cycle, the up to now best performing of the ant algorithms we have tested. We report many results regarding its performance when varying the values of control parameters and we compare it with some FEM algorithms. And in accordance with treatment principles, the microstructure of the alloy is simulated. First modal analyses of microstructure defects are performed in ANSYS. Second the genetic algorithm is implemented in MATLAB to Calculate the Value of b and p. The last, The FEM analysis results are imported in ANSYS about the Stress distribution. The result presented in this paper is obtained using the Genetic Algorithm Optimization Toolbox.

Abstract: 1040 °C was studied during the period imposed 137MPa tensile creep nickel-base single crystal superalloys γ/γ' the evolution of two-phase approach. ANSYS finite element method is using a single crystal alloy with / without external load when the Von Mises stress in the gand γ' two phase distribution. The comprehensive analysis of the formula, the coefficient values usually experience, not very accurate, this article dealing with convolution Algorithm coefficient. This algorithm uses orthogonal crossover to generate initial population and uses elitist-crossover to increase the good patterns of the population and uses hybrid mutation to increase the ability of local and global optimization. It has shown fascinating results when being used in the optimization of multimodal function. The results showed that: In the creep period, the corresponding cubic γ' along the von Mises stress and strain energy density of the crystal face to form raft-like organizations.

Abstract: we have used the metaphor of ant colonies to define "the Ant system", a class of distributed algorithms for combinatorial optimization. In this paper we analyze some properties of Ant-cycle, the up to now best performing of the ant algorithms we have tested. We report many results regarding its performance when varying the values of control parameters and we compare it with some FEM algorithms. And in accordance with treatment principles, the microstructure of the alloy is simulated.