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T-S model is linearized at sampling points into the form of linear time-invariant state space , and using supervisory predictive control and muti-step predictive control strategy, which reduces amount of calculation and improves the control performance. Introduction

Power unit coordinated control (PUCC) problem was being focused by many optimizers as a serious task to be tackled in several aspects. Through this paper differential evolution (DE) and particle swarm optimization (PSO) algorithms are implemented to solve the PUCC problem. With considering four objectives to be optimized: minimization of tracking error in load power demand, fuel consumption, throttling losses due to steam control valve, and feeding water. Simulation experiments are made through case-study by aid of MATLAB programs to develop the required comparison through the two algorithms.

Power unit coordinate control problem is a typical non-linear, constrained optimization problem with high computational complexity, in which the optimal solution is balanced between unit load demand and pressure set point. This problem is traditionally solved by fixed nonlinear mapping method, while more and more attention is payed on solving this issue with modern heuristic algorithms, like GA, PSO, etc. This paper presents a comparison study between two typical modern heuristic algorithms with their applications to a 3-objective power unit coordinate control problem. The merits and drawbacks of each algorithm is analyzed via simulation experiments.

Orthogonal experiment is used to study the influence of splitting load and mixing of polypropylene fiber of different volume fraction, different length and different mass ratio of long and short fiber on permeability of chloride ion in concrete. The results show that the chloride ion diffusion coefficient increases as the stress ratio increasing, and the relationship between them approximately agrees with exponential function. The influences of fiber volume fraction and fiber length on permeability of chloride ion in concrete are significant, and using shorter polypropylene fiber in the range of low volume fraction can lower permeability of chloride ion in concrete, whereas long fiber and large volume fraction will increase the permeability. The effect of lowering permeability of chloride ion in concrete is most obvious, when the fiber volume fraction is 0.1%, the fiber length is the combination of 6mm and 9mm, and the mass ratio of long and short fiber is 1:2.