【摘要】：輸煤棧橋作為承載皮帶運(yùn)輸機(jī)的主要構(gòu)筑物,廣泛應(yīng)用于煤礦、電力等工業(yè)生產(chǎn)活動(dòng)中。近年來(lái),由于生產(chǎn)工藝的需要,輸煤棧橋越來(lái)越朝著大跨度方向發(fā)展,且多采用鋼結(jié)構(gòu)形式。由于鋼結(jié)構(gòu)自身剛度小,跨度大,輸煤棧橋結(jié)構(gòu)在機(jī)械設(shè)備的動(dòng)力荷載作用下會(huì)產(chǎn)生振動(dòng)。實(shí)踐表明,目前輸煤棧橋的振動(dòng)問(wèn)題較為嚴(yán)重,特別是在啟動(dòng)或制動(dòng)的過(guò)渡階段會(huì)產(chǎn)生共振現(xiàn)象,已經(jīng)成為亟需研究并解決的問(wèn)題。本文選取某一輸煤棧橋下懸網(wǎng)架結(jié)構(gòu)實(shí)例,研究了利用懸吊式調(diào)諧質(zhì)量阻尼器(簡(jiǎn)稱為TMD)系統(tǒng)來(lái)減小輸煤棧橋的豎向振動(dòng)的方法。主要工作如下:(1)通過(guò)查看文獻(xiàn)資料,掌握輸煤棧橋的主要結(jié)構(gòu)形式及結(jié)構(gòu)特點(diǎn),了解輸煤棧橋振動(dòng)問(wèn)題及TMD用于振動(dòng)控制的研究現(xiàn)狀。(2)選取某一輸煤棧橋下懸網(wǎng)架結(jié)構(gòu)實(shí)例,通過(guò)SAP2000有限元分析軟件,建立三維結(jié)構(gòu)模型,并通過(guò)對(duì)結(jié)構(gòu)進(jìn)行模態(tài)分析、諧響應(yīng)分析及在簡(jiǎn)諧荷載作用下的時(shí)程分析,分析結(jié)構(gòu)的動(dòng)力特性及振動(dòng)響應(yīng)。(3)基于Den Hartog參數(shù)優(yōu)化法和頻率呈線性分布的多重調(diào)諧質(zhì)量阻尼器(簡(jiǎn)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(zhì)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(duì)振動(dòng)控制效果的影響。(4)根據(jù)結(jié)構(gòu)模型,計(jì)算TMD的剛度和阻尼參數(shù),確定TMD的位置、質(zhì)量比、數(shù)量等。在原結(jié)構(gòu)模型基礎(chǔ)上建立結(jié)構(gòu)-TMD模型,進(jìn)行諧響應(yīng)分析,計(jì)算其振動(dòng)響應(yīng),并與原結(jié)構(gòu)的振動(dòng)響應(yīng)進(jìn)行對(duì)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(duì)結(jié)構(gòu)-TMD模型進(jìn)行動(dòng)力特性分析,并與原結(jié)構(gòu)動(dòng)力特性進(jìn)行對(duì)比,分析加TMD后結(jié)構(gòu)的動(dòng)力特性的變化,研究TMD減振機(jī)理。通過(guò)進(jìn)行諧響應(yīng)分析和簡(jiǎn)諧荷載作用下的時(shí)程分析以及地震作用下的時(shí)程分析,研究TMD的振動(dòng)控制效果。研究結(jié)果表明,TMD對(duì)于輸煤棧橋的振動(dòng)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(xué)位授予單位】：西安建筑科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：U441.3;U448.18

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本文編號(hào)：2185997