文档介绍：上海交通大学
硕士学位论文
考虑时滞的大跨度空间网格结构风振预测控制研究
姓名:邓麟勇
申请学位级别:硕士
专业:结构工程
指导教师:黄真
20090101
考虑时滞的大跨度空间网格结构风振预测控制研究
摘要
大跨度空间结构有许多突出的优点,它造型多样,跨度大,可灵活满足各种功
能需求,近年来得到飞速的发展。然而此类结构通常自重较轻,自振频率低,对脉
动风荷载或地震作用比较敏感,容易引起较大的振动反应,影响结构正常使用和安
全。因此,研究采用经济、高效、可靠的手段减少大跨度空间结构的风灾损害十分
重要。
由于大跨度空间结构体型巨大,造型复杂、振动中存在时滞甚至变时滞,同时
实际作用于其上的脉动风荷载是不可预知的外部干扰,难以得到结构精确的数学模
型,所以采用传统的手段难以对其进行有效的振动控制。
本文首先对结构振动控制的各种方法以及各自特点进行分类综述,进一步以结
构的抗风减灾为实际背景,以大跨度空间结构为实际研究对象,研究了含变时滞空
间结构系统的振动控制问题。在具体分析系统时滞产生的原因的基础上,提出了可
解决时滞系统振动控制问题的改进动态矩阵预测控制算法,进一步采用 matlab 语言
编程实现这一算法。最后,本文选用两种典型的大跨度空间结构进行脉动风作用下
的预测控制数值模拟分析,以此为基础,提出了对含变时滞系统进行控制时预测控
制算法中参数选择的一般性原则。数值模拟的结果表明,本文提出的算法是切实有
效的。
关键词:空间结构, 振动控制,风振,预测控制,可变时滞
-I-
THE MODEL PREDICTIVE CONTROL TO
WIND-INDUCED VIBRATION ON LONG-SPAN SPATIAL
LATTICE STRUCTURES WITH TIME LAG
ABSTRACT
Due to the outstanding advantages, such as attractive outlook, large span, and multi
functions, the long-span spatial structures are widely used in many important buildings.
heless, these structures are usually with light dead loads, low vibration frequency
and quite sensitive for pulsating wind loads or seismic loads, which may result in
remarkable structural vibration and problems in its general condition of use and safety.
Consequently, it is important to control such structures under dynamic loads with effective
method.
The long-span spatial structures under dynamic loads with time lag, even variable
time lag, are a plex system to control. At the same time, the dynamic wind load
put on it is unpredictable and the precise mathematic model of the spatial structure is
difficult to obtain. All of the above, the effect of using the traditional method to control the
long-span spatial structure under dynamic wind load is unsatisfactory
Based on approved dynamic matrix predictive control method, the wind-induced
vibration control of large span spatial structures with variable time lag was studied in this
di