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基于旋转状态转移的麻雀搜索算法
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作者 刘西全 周新志 《智能计算机与应用》 2023年第4期78-83,90,共7页
针对现有的麻雀搜索算法(SSA)在接近全局最优时,种群多样性减少,容易陷入局部最优等问题,提出一种精英旋转策略的麻雀搜索优化算法(RLSSA)。首先,对麻雀种群中发现者进行旋转状态转移变换,以提高算法的局部搜索能力,提高算法的搜索精度... 针对现有的麻雀搜索算法(SSA)在接近全局最优时,种群多样性减少,容易陷入局部最优等问题,提出一种精英旋转策略的麻雀搜索优化算法(RLSSA)。首先,对麻雀种群中发现者进行旋转状态转移变换,以提高算法的局部搜索能力,提高算法的搜索精度。其次,对加入者引入基于莱维飞行的搜索策略,提高算法的全局搜索能力,同时引入贪婪算法搜索寻优策略。最后,在12个基础函数上进行仿真实验。实验结果表明上述方法在收敛速度和精度上有显著优势。 展开更多
关键词 麻雀搜索算法 旋转状态转移 莱维飞行 贪婪寻优策略
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Analysis of Unbalances Forces Using Methods of Identification and Finite Elements
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作者 Lucas Rangel de Oliveira Gilberto Pechoto de Melo +1 位作者 Tiago Bemardes Firme Mariana Costa Falcao 《Journal of Mechanics Engineering and Automation》 2014年第5期400-402,共3页
The study of damage in rotating machineries is of fundamental interest in the fields of machine and structure design. A rotating system, supported by bearings and under some dynamic conditions, can generate a variety ... The study of damage in rotating machineries is of fundamental interest in the fields of machine and structure design. A rotating system, supported by bearings and under some dynamic conditions, can generate a variety of problems that are encountered in many different types of rotating machines. One of these problems is the unbalance due to non-homogeneous mass distribution along the shaft. One of the techniques which are widespread today is the identification of parameters and excitation forces that may well followed by monitoring the evolution and change of possible variations of these parameters. Although several methods for the identification of unbalance excitation force are available in the literature, none of them can be considered unrestricted to be applied for all rotating systems. In this study, two methodologies to identify unknown excitations, such as unbalance, have been proposed. This project refers to the analysis of unbalanced forces from displacement parameters and speed by using methods of identification by Fourier series and Legendre polynomials together with the finite element method, state observers in reasons of the problem of absence of signs of rotational displacement, bandpass filter were used to noise suppression of the data collected from the experimental part, Quasi-Newton method to minimize a function in which the bearing stiffness and its damping are unknowns, and also the experimental verification of the methodology, using for this system owned by a rotary mechanical vibrations of the Department of Mechanical Engineering of Faculty of Engineering, campus of llha Solteira. 展开更多
关键词 Unbalances forces finite element Fourier series Legendre polynomials rotate machines.
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