Zhang Xiangwei

Research on PID Control Parameters Tuning Based on Election-Survey Optimization Algorithm

According to the tuning rule of PID control parameters, IAE, ISE, ITAE, ITSE performance criteria are chosen to be optimization object, a new optimization method of PID control parameters tuning based on Election-survey Optimization Algorithm is presented, and is applied to design optimally a PID control, and the simulation results show that satisfactory performances are obtained by means of this method developed.

A dynamic schedule methodology for discrete job shop problem based on Ant Colony Optimization

Job shop scheduling is an important problem in implementing Manufacturing Execution System (MES). In this paper, an algorithm based on Ant Colony Optimization (ACO) is proposed to solve a discrete job shop scheduling problem (DJSSP). A dynamic schedule methodology is applied to DJSSP. The main concept is that the real-time production status from the MES IDT (Intelligent Data Terminal) is passed to the pheromone updating rule to guide the transfer of the work pieces. MES IDE is a hardware platform deployed in the shop floor with the aim of real-time and wireless manufacturing. This methodology has been put into real-life practice in several manufacturing enterprises according to its universality. It has achieved excellent efficiency in terms of real-time scheduling and planning, JIT (Just-In-Time) manufacturing etc.

THEORETICAL STUDY OF THREE-DIMENSIONAL NUMERICAL MANIFOLD METHOD

The three-dimensional numerical manifold method(NMM) is studied on the basis of two-dimensional numerical manifold method. The three-dimensional cover displacement function is studied. The mechanical analysis and Hammer integral method of three-dimensional numerical manifold method are put forward. The stiffness matrix of three-dimensional manifold element is derived and the dissection rules are given. The theoretical system and the numerical realizing method of three-dimensional numerical manifold method are systematically studied. As an example, the cantilever with load on the end is calculated, and the results show that the precision and efficiency are agreeable.

METHOD OF GREEN’S FUNCTION OF CORRUGATED SHELLS

By using the fundamental equations of axisymmetric shallow shells of revolution, the nonlinear bending of a shallow corrugated shell with taper under arbitrary load has been investigated. The nonlinear boundary value problem of the corrugated shell was reduced to the nonlinear integral equations by using the method of Greens function. To solve the integral equations, expansion method was used to obtain Greens function. Then the integral equations were reduced to the form with degenerate core by expanding Greens function as series of characteristic function. Therefore, the integral equations become nonlinear algebraic equations. Newtons iterative method was utilized to solve the nonlinear algebraic equations. To guarantee the convergence of the iterative method, deflection at center was taken as control parameter. Corresponding loads were obtained by increasing deflection one by one. As a numerical example, elastic characteristic of shallow corrugated shells with spherical taper was studied. Calculation results show that characteristic of corrugated shells changes remarkably. The snapping instability which is analogous to shallow spherical shells occurs with increasing load if the taper is relatively large. The solution is close to the experimental results.By using the fundamental equations of axisymmetric shallow shells of revolution, the nonlinear bending of a shallow corrugated shell with taper under arbitrary load has been investigated. The nonlinear boundary value problem of the corrugated shell was reduced to the nonlinear integral equations by using the method of Greens function. To solve the integral equations, expansion method was used to obtain Greens function. Then the integral equations were reduced to the form with degenerate core by expanding Greens function as series of characteristic function. Therefore, the integral equations become nonlinear algebraic equations. Newtons iterative method was utilized to solve the nonlinear algebraic equations. To guarantee the convergence of the iterative method, deflection at center was taken as control parameter. Corresponding loads were obtained by increasing deflection one by one. As a numerical example,elastic characteristic of shallow corrugated shells with spherical taper was studied.Calculation results show that characteristic of corrugated shells changes remarkably. The snapping instability which is analogous to shallow spherical shells occurs with increasing load if the taper is relatively large. The solution is close to the experimental results.

An Integration Methodology Based on SOA to Enable Real-Time Closed-Loop MRP between MES and ERP

The paper proposes a real-time integration solution aimed at resolving the inefficiency problem when integrating ERP (Enterprise Resources Planning) and MES (Manufacturing Execution System). In this solution, a Data Integration Bus (DIB) system is constructed based on the principles of standardization, uniformity, flexibility, and robustness. A message-passing mechanism that is combining with a lightweight SOA (Service Oriented Architecture) has been described in detail and used to tackle these issues. After successive integration of ERP and MES, this solution can achieve excellent efficiency, uniformity and real-time results. This method is also worthy to be extended in the future with great merits.

Election Campaign Optimization Algorithm for Multi-peak Optimization Problems

Multi-peak Optimization problems are solved by Election Campaign Optimization algorithm. 3 Multi-peak Optimization problems are selected as examples to verify this algorithm. It is found that Election Campaign Optimization algorithm can jump out of local peaks easily and search out the all global optimal solution of Multi-peak Optimization problems simultaneously. It means that Election Campaign Optimization algorithm is a high efficient optimization algorithm for Multi-peak Optimization problems.

Study of the Application of Election-Survey Algorithm for Nonlinear Constrained Optimization Problems

For the nonlinear constrained optimization problems, election-survey algorithm is combined with dynamic penalty function method to get the optimum in order to demonstrate solving capability of the algorithm. The tests of classic function and engineering optimization application model show that the election-survey algorithm can constringe rapidly to global optimal solution and achieve better optimization solution of objective function. It is feasible and effective in solving nonlinear constrained optimal problems, and available for engineering optimization.

A new approach for solving geometric constraint based on Election-Survey Algorithm

Aimed at the widespread practical significance of solving geometric constraint problems in engineering, classic numerical methods are highly sensitive to the initial guess, but it is difficult to find a suitable good initial guess in practical operation. So the problem of solving geometric constraint is transformed to the problem of function optimization, and then, Election-Survey Optimization Algorithm is introduced to achieve the optimal result for the problem. The experimental results of solving two instructive examples show that Election-Survey Optimization Algorithm has higher convergence speed and more precise solution, and it is a feasible and effective approach in solving geometric constraint problems.

Research on physical shape preserving curve reconstruction

Fusion of various data is an effective way to improve the precision and efficiency of acquiring information in reverse engineering. A method of physical shape preserving curve reconstruction is proposed to better realize the data fusion of coordinate measuring machine (CMM) and visual information. From the principle of materials mechanics, the strain energy of the curve corresponding to the distortion is advanced as the internal energy, and the elastic potential energy of the curve is established, using a few precise measured data points as the equilibrium position, to be the external energy. On the basis of the principle of variation calculus, the basic spline finite element method (B-spline FEM) is used to determine the equilibrium position of curve deformation. Numerical simulation indicates that there is an extremely good agreement between the new fitted curve and the actual curve.

PHYSICAL-BASED SHAPE PRESERVING CURVE RECONSTRUCTION

Fusion of various data is an effective way to improve the precision and efficiency of data acquiring in reverse engineering. A method of physical-based shape preserving curve reconstruction is proposed to better realize the data fusion of coordinate measuring machine(CMM) and visual information. From the principle of materials mechanics, the strainenergy of curve corresponding to the distortion is advanced as the internal energy, and the elastic potential energy of curve isestablished, using few precise measured data point as the equilibrium position, to be the external energy. Based on principle of variation calculus, the basic spline finite element method(B-spline FEM) is used to determine the equilibrium position of curve deformation. Numerical simulation indicates that there is an extremely good agreement between the new fitted curve and the real curve.