火炸药粉体材料的粒度测量

扼要介绍了现代粒度测量技术的进展，阐明了如何建立合适的火炸药粒度测量系统和如何选择粒度仪的观点，回答了粒度测量方面为广大测试工作者所关心的一些疑难问题。     

光衰减粒度简化计算法

本文提出了粒度计算的一种简化方法。经过理论上的推导和对大量实验数据的验算,证明该法可用于圆盘离心粒度测定法的数据处理。方法直接简便,结果准确可靠,完全能满足实际工作的需要。     

Bi-objective path optimization of flapping airfoils based on a surrogate model

A bi-objective optimization problem for flapping airfoils is solved to maximize the time-averaged thrust coefficient and the propulsive efficiency. Design variables include the plunging amplitude, the pitching amplitude and the phase shift angle. A well defined Kriging model is used to substitute the time-consuming high fidelity model, and a multi-objective genetic algorithm is employed as the search algorithm. The optimization results show that the propulsive efficiency can be improved by reducing the plun...     

A novel immune genetic algorithm based on quasi secondary response

Combining the advantages of a genetic algorithm and an artificial immune system,a novel genetic algorithm named immune genetic algorithm based on quasi secondary response(IGA-QSR)is proposed.IGA-QSR employs a database to simulate the standard secondary response and the quasi secondary response.Elitist strategy,automatic extinction,clonal propagation,diversity guarantee,and selection based on comprehensive fitness are also used in the process of IGA-QSR.Theoretical analysis,numerical examples of three benchmark mathematical optimization problems and a traveling salesman problem all demonstrate that IGA-QSR is more effective not only on convergence speed but also on convergence probability than a simple genetic algorithm with the elitist strategy(SGA-ES).Besides,IGA-QSR allows the designers to stop and restart the optimization process freely without losing the best results that have already been obtained.These properties make IGA-QSR be a feasible,effective and robust search algorithm for complex engineering problems.