摘要
抖振问题是离散变结构控制在实际系统中应用的突出障碍。基于模糊控制的优点,文中采用了一种含有模糊趋近律的离散变结构控制方法对地震作用下建筑结构的振动控制问题进行了研究。给出了确定切换面的方法,并推导了控制律的表达式。文中以一个3层剪切型建筑结构模型为例验证所提出的离散变结构控制方法的有效性,算例分析结果表明,所提出的控制方法能够有效地减小结构的地震峰值响应,同时达到了削弱控制系统抖振的目的。
Existing discrete time variable structure control methods for reducing seismological response of building structure, such as those of Cai et al and Zhao et al, suffer, in our opinion, the shortcoming that it is almost very difficult to avoid excessive chattering effect. Therefore, based on the advantages of discrete time variable structure control and fuzzy control, we propose a new discrete time variable structure control method with fuzzy adaptive regulation of reaching law. Such a method can not only reduce seismological response but also avoid undue chattering effect. In the full paper, we explain in detail the application of the discrete time variable structure control method to the control of seismologically excited structural systems. We give numerical simulations for MDOF （Multiple-Degree-of-Freedom） shear building model containing an active brace system. The results of seismological response are shown in Table 2 and Fig. 6; they show that, like Refs. 9 and 10, seismological responses can be markedly reduced. The results for chattering effect are given in Figs. 3 and 5; Fig. 3 is for Refs. 9 and 10, and Fig. 5 is for the discrete time variable structure control method with fuzzy adaptive regulation of reaching law; Fig. 5 shows preliminarily that our method can keep the chattering effect sufficiently low but, in this case, Refs. 9 and 10 cannot do so.
出处
《西北工业大学学报》
EI
CAS
CSCD
北大核心
2007年第5期747-751,共5页
Journal of Northwestern Polytechnical University
基金
教育部新世纪优秀人才计划(NCET-04-0958)
陕西省自然科学基金(2006A07)
国家111引智计划(B07050)
大连理工大学工业装备结构分析国家重点实验室开放基金资助
关键词
离散变结构控制
模糊控制
趋近律
抖振
建筑结构
discrete time variable structure control, fuzzy control, reaching law, chattering effect, building structure
