【摘要】：輸煤棧橋作為承載皮帶運輸機的主要構筑物,廣泛應用于煤礦、電力等工業(yè)生產活動中。近年來,由于生產工藝的需要,輸煤棧橋越來越朝著大跨度方向發(fā)展,且多采用鋼結構形式。由于鋼結構自身剛度小,跨度大,輸煤棧橋結構在機械設備的動力荷載作用下會產生振動。實踐表明,目前輸煤棧橋的振動問題較為嚴重,特別是在啟動或制動的過渡階段會產生共振現(xiàn)象,已經成為亟需研究并解決的問題。本文選取某一輸煤棧橋下懸網(wǎng)架結構實例,研究了利用懸吊式調諧質量阻尼器(簡稱為TMD)系統(tǒng)來減小輸煤棧橋的豎向振動的方法。主要工作如下:(1)通過查看文獻資料,掌握輸煤棧橋的主要結構形式及結構特點,了解輸煤棧橋振動問題及TMD用于振動控制的研究現(xiàn)狀。(2)選取某一輸煤棧橋下懸網(wǎng)架結構實例,通過SAP2000有限元分析軟件,建立三維結構模型,并通過對結構進行模態(tài)分析、諧響應分析及在簡諧荷載作用下的時程分析,分析結構的動力特性及振動響應。(3)基于Den Hartog參數(shù)優(yōu)化法和頻率呈線性分布的多重調諧質量阻尼器(簡稱為MTMD)模型model-1參數(shù)優(yōu)化法,分析了TMD的數(shù)量,MTMD的總質量比,MTMD的阻尼比,MTMD的頻帶寬度和中心頻率比等系統(tǒng)參數(shù)對振動控制效果的影響。(4)根據(jù)結構模型,計算TMD的剛度和阻尼參數(shù),確定TMD的位置、質量比、數(shù)量等。在原結構模型基礎上建立結構-TMD模型,進行諧響應分析,計算其振動響應,并與原結構的振動響應進行對比,確定TMD的減振效果。比較兩種參數(shù)優(yōu)化法的減振效果以確定采用的參數(shù)優(yōu)化方法。(5)根據(jù)Den Hartog參數(shù)優(yōu)化法,對結構-TMD模型進行動力特性分析,并與原結構動力特性進行對比,分析加TMD后結構的動力特性的變化,研究TMD減振機理。通過進行諧響應分析和簡諧荷載作用下的時程分析以及地震作用下的時程分析,研究TMD的振動控制效果。研究結果表明,TMD對于輸煤棧橋的振動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.
【學位授予單位】：西安建筑科技大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：U441.3;U448.18

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本文編號：2185997