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为了分析多质量弹性扭转系统的特性,需要建立系统模型.考虑到待辨识的系统具有一定的弹性以及分数阶系统的优良特性,尝试将其辨识为分数阶系统.在时域中,对分数阶系统进行辨识时,确定系统的阶数不是很方便,考虑到粒子群算法的随机搜索功能,最终,利用粒子群算法来辨识多质量弹性扭转系统,获得了系统的分数阶模型.作为对比,还对系统进行了整数阶系统辨识,从性能指标来看,分数阶系统优于整数阶系统.为进一步对系统进行特性分析和控制奠定了基础.
In order to analyze the characteristics of multi-mass elastic torsion system, a system model needs to be established. Considering that the system to be identified has some elasticity and the excellent characteristics of fractional system, it is tried to identify it as a fractional system.In the time domain, When the system is identified, it is not very convenient to determine the order of the system. Considering the PSO’s random search function, the PSO algorithm is used to identify the multi-mass elastic torsion system and obtain the fractional model of the system. According to the performance index, the fractional order system is superior to the integer level order system, which lays the foundation for the further analysis of the characteristic of the system.