大跨度输煤栈桥动力特性分析与振动控制研究
发布时间：2018-08-16 12:34
【摘要】：输煤栈桥作为承载皮带运输机的主要构筑物,广泛应用于煤矿、电力等工业生产活动中。近年来,由于生产工艺的需要,输煤栈桥越来越朝着大跨度方向发展,且多采用钢结构形式。由于钢结构自身刚度小,跨度大,输煤栈桥结构在机械设备的动力荷载作用下会产生振动。实践表明,目前输煤栈桥的振动问题较为严重,特别是在启动或制动的过渡阶段会产生共振现象,已经成为亟需研究并解决的问题。本文选取某一输煤栈桥下悬网架结构实例,研究了利用悬吊式调谐质量阻尼器(简称为TMD)系统来减小输煤栈桥的竖向振动的方法。主要工作如下:(1)通过查看文献资料,掌握输煤栈桥的主要结构形式及结构特点,了解输煤栈桥振动问题及TMD用于振动控制的研究现状。(2)选取某一输煤栈桥下悬网架结构实例,通过SAP2000有限元分析软件,建立三维结构模型,并通过对结构进行模态分析、谐响应分析及在简谐荷载作用下的时程分析,分析结构的动力特性及振动响应。(3)基于Den Hartog参数优化法和频率呈线性分布的多重调谐质量阻尼器(简称为MTMD)模型model-1参数优化法,分析了TMD的数量,MTMD的总质量比,MTMD的阻尼比,MTMD的频带宽度和中心频率比等系统参数对振动控制效果的影响。(4)根据结构模型,计算TMD的刚度和阻尼参数,确定TMD的位置、质量比、数量等。在原结构模型基础上建立结构-TMD模型,进行谐响应分析,计算其振动响应,并与原结构的振动响应进行对比,确定TMD的减振效果。比较两种参数优化法的减振效果以确定采用的参数优化方法。(5)根据Den Hartog参数优化法,对结构-TMD模型进行动力特性分析,并与原结构动力特性进行对比,分析加TMD后结构的动力特性的变化,研究TMD减振机理。通过进行谐响应分析和简谐荷载作用下的时程分析以及地震作用下的时程分析,研究TMD的振动控制效果。研究结果表明,TMD对于输煤栈桥的振动控制具有很好的效果。
[Abstract]:As the main structure of belt conveyer, coal conveyer is widely used in coal mine, electric power and other industrial production activities. In recent years, because of the need of production technology, coal conveyance trestle is more and more developed towards the direction of long span, and steel structure is used more and more. Because of the small stiffness and large span of steel structure, the structure of coal conveyance trestle will produce vibration under the dynamic load of mechanical equipment. The practice shows that the vibration problem of coal conveyance trestle is more serious at present, especially in the transition stage of starting or braking, which will produce resonance phenomenon, which has become a problem that needs to be studied and solved urgently. In this paper, the method of reducing vertical vibration of coal conveyance trestle by using suspension tuned mass damper (TMD) system is studied. The main works are as follows: (1) by reviewing the literature, the main structure and characteristics of coal conveyance trestle are grasped, and the vibration problems of coal conveyance trestle and the research status of TMD used in vibration control are understood. (2) A practical example of suspension grid structure under a coal conveyance trestle is selected. Through the finite element analysis software of SAP2000, the three-dimensional structural model is established, and the modal analysis, harmonic response analysis and time-history analysis under simple harmonic load are carried out. The dynamic characteristics and vibration response of the structure are analyzed. (3) based on the Den Hartog parameter optimization method and the multiple tuned mass damper (MTMD) model model-1 parameter optimization method based on the linear frequency distribution. The influence of the system parameters such as the total mass ratio of TMD and the damping ratio of MTMD on the vibration control effectiveness is analyzed. (4) according to the structural model, the stiffness and damping parameters of TMD are calculated, and the position and mass ratio of TMD are determined. Quantity, etc. On the basis of the original structure model, the structure TMD model is established, the harmonic response is analyzed, the vibration response is calculated, and the vibration response of the original structure is compared with that of the original structure, and the damping effect of TMD is determined. The damping effect of two parameter optimization methods is compared to determine the parameter optimization method. (5) according to the Den Hartog parameter optimization method, the dynamic characteristics of the structure TMD model are analyzed and compared with the original structure dynamic characteristics. The dynamic characteristics of the structure with TMD are analyzed and the mechanism of TMD vibration reduction is studied. The vibration control effect of TMD is studied by means of harmonic response analysis, time-history analysis under simple harmonic load and time-history analysis under seismic action. The results show that TMD has a good effect on vibration control of coal conveyance trestle.
【学位授予单位】：西安建筑科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U441.3;U448.18
本文编号：2185997
[Abstract]:As the main structure of belt conveyer, coal conveyer is widely used in coal mine, electric power and other industrial production activities. In recent years, because of the need of production technology, coal conveyance trestle is more and more developed towards the direction of long span, and steel structure is used more and more. Because of the small stiffness and large span of steel structure, the structure of coal conveyance trestle will produce vibration under the dynamic load of mechanical equipment. The practice shows that the vibration problem of coal conveyance trestle is more serious at present, especially in the transition stage of starting or braking, which will produce resonance phenomenon, which has become a problem that needs to be studied and solved urgently. In this paper, the method of reducing vertical vibration of coal conveyance trestle by using suspension tuned mass damper (TMD) system is studied. The main works are as follows: (1) by reviewing the literature, the main structure and characteristics of coal conveyance trestle are grasped, and the vibration problems of coal conveyance trestle and the research status of TMD used in vibration control are understood. (2) A practical example of suspension grid structure under a coal conveyance trestle is selected. Through the finite element analysis software of SAP2000, the three-dimensional structural model is established, and the modal analysis, harmonic response analysis and time-history analysis under simple harmonic load are carried out. The dynamic characteristics and vibration response of the structure are analyzed. (3) based on the Den Hartog parameter optimization method and the multiple tuned mass damper (MTMD) model model-1 parameter optimization method based on the linear frequency distribution. The influence of the system parameters such as the total mass ratio of TMD and the damping ratio of MTMD on the vibration control effectiveness is analyzed. (4) according to the structural model, the stiffness and damping parameters of TMD are calculated, and the position and mass ratio of TMD are determined. Quantity, etc. On the basis of the original structure model, the structure TMD model is established, the harmonic response is analyzed, the vibration response is calculated, and the vibration response of the original structure is compared with that of the original structure, and the damping effect of TMD is determined. The damping effect of two parameter optimization methods is compared to determine the parameter optimization method. (5) according to the Den Hartog parameter optimization method, the dynamic characteristics of the structure TMD model are analyzed and compared with the original structure dynamic characteristics. The dynamic characteristics of the structure with TMD are analyzed and the mechanism of TMD vibration reduction is studied. The vibration control effect of TMD is studied by means of harmonic response analysis, time-history analysis under simple harmonic load and time-history analysis under seismic action. The results show that TMD has a good effect on vibration control of coal conveyance trestle.
【学位授予单位】：西安建筑科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U441.3;U448.18
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，本文编号：2185997
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