【作者】 陈莉；

【导师】 陈静；

【作者基本信息】 武汉理工大学 ， 控制理论与控制工程， 2008， 硕士

【摘要】 中国是世界上地震灾害严重的国家之一。对土木结构工程而言,在地震作用时,使其结构不受或减小破坏从而降低地震灾害具有重要的意义。升船机是大型水利枢纽工程中提升过往船舶的重要工具,与多级放水船闸相比它可以使船舶过坝的时间大大减少。升船机结构是一种高柔结构,当受到地震作用时,其下部筒体结构的侧移刚度很大,而顶部单层厂房柱的侧移刚度很小,这种巨大的刚度突变引起升船机顶部厂房强烈的鞭梢效应。因此,减小其鞭梢效应成为当前一个非常重要的研究课题。泛布尔代数是20世纪80年代在布尔代数基础上发展起来的一种新型逻辑工具,它具有不同状态的布尔数,能够描述复杂过程。泛布尔代数逻辑控制(以下简称“逻辑控制”)是以泛布尔代数为基础的新型计算机控制理论。逻辑控制作为一种新型智能控制,已被用于诸如空调温度控制、水泥磨配料过程和纸机纸张定量等方面。目前,逻辑控制已成功运用到MR阻尼器耦联的带裙房高层建筑中。在结构防震控制方面,采用逻辑控制算法进行振动控制可谓已经起步,但其运用于升船机结构的研究尚属首例。首先,本文介绍了目前结构振动控制和升船机结构减振控制的发展和现状,以及逻辑控制的研究现状。第二,介绍了升船机结构的技术参数,在了解升船机结构的动力学模型基础上,构建了升船机的结构仿真模型,并对无控制作用下升船机结构地震反应进行了仿真,验证了此时升船机顶部厂房的地震鞭梢效应。第三,以抑制升船机顶部厂房的地震鞭梢效应为研究目标,根据逻辑控制规则,设计了九点、二十五点和二十七点逻辑控制器,并将它们运用于升船机结构进行仿真。最后,比较分析了不同逻辑控制器对该模型的适用性和控制效果,并做了有控制与无控制作用时的比较。仿真结果表明,逻辑控制方法简单、灵活、方便,可以有效地减小升船机结构在地震波激励下的鞭梢效应,减震效果十分明显。其中,升船机结构在二十五点逻辑控制器作用时的减震效果最为明显。得出结论:将对象的运动过程进行细致的划分,会使得系统的预期性能指标得以更好的实现。更多还原

【Abstract】 China is one of the countries with serious earthquake disaster in the world. As to the construction structural engineering, it is vital to reduce the earthquake affect for the structure. The ship lifting is the important tool promoting the passing vessel in the large-scale water control pivot project. Compared with multistage ship-strobe, the ship lifting can shorten the time of vessel passing dam greatly. The ship lifting structure is one kind of high supple structure, and the lower structure’s rigidity is much bigger than the upper structure’s. Such huge rigidity’s sudden change would cause intense whipping effect to the ship lifting under earthquake. Therefore, reducing its whipping effect becomes a current extremely important research subject.The Pan Boolean algebra is one kind of the new logical tool which based on the Boolean algebra in the 1980s. It is Boolean number with the different state, and could describe the complex process. The Pan Boolean algebra logical control (short for "logical control") is a new computer control theory. At present, the logical control has been applied to the temperature control of the air conditioning, the dispensation of materials in the production process of cement mill and the basis weight control of the paper. In the aspect of structure quakeproof control, the logical control has also been utilized successfully in the tall building with podium structure using MR damper. The logical control algorithm has been already used in the structure vibration control, but it is the first time to be used in the research of the ship lifting structure.First, this dissertation introduces the structural vibration control’s and the ship lifting structural anti-vibration control’s development and the present situation, as well as the present situation of the logical control. Second, base on the ship lifting structural technical parameter and its dynamics model, the ship lifting structural simulation model is set up and the simulation has been carried on without controller under the earthquake. It shows the obvious roof whiplash effect by the simulation. So in order to decreasing the roof whiplash effect of ship lifting under the earthquake, according to the logical control rule, the nine points, the twenty-five points and the twenty-seven points logical controllers are designed, and utilized in the ship lifting structure separately. Finally, this dissertation analyzes comparatively the control effects of the three different logic controllers, and the response under no control and logical control. The simulation result shows that the logical control method not only is simple, flexible and convenient, but also may decrease the roof whiplash effect of ship lifting under the earthquake effectively. Especially, when twenty-five points logical controller is applied, the control effect is most obvious. The conclusion is that the more division of the movement process would realize the system’s anticipated performance better.更多还原