發(fā)布時(shí)間：2018-03-09 21:52

  本文選題：斗輪堆取料機(jī)　切入點(diǎn)：俯仰結(jié)構(gòu)　出處：《哈爾濱工程大學(xué)》2013年碩士論文　論文類型：學(xué)位論文

【摘要】：斗輪堆取料機(jī)是一種高效的連續(xù)裝卸設(shè)備，，在一些散料裝卸的港口、礦石、煤等散料儲(chǔ)備場(chǎng)所發(fā)揮著巨大的作用。俯仰結(jié)構(gòu)是斗輪堆取料機(jī)的重要組成部分，其特點(diǎn)是自重大，外伸較長(zhǎng)，結(jié)構(gòu)和受力情況比較復(fù)雜，其可靠性、安全性不能忽視，因此在斗輪堆取料機(jī)設(shè)計(jì)時(shí)，要綜合考慮其剛、強(qiáng)度和振動(dòng)特性以確保設(shè)備在實(shí)際工作時(shí)能安全運(yùn)行。 依據(jù)相關(guān)技術(shù)資料，利用三維造型軟件UG NX6.0建立俯仰結(jié)構(gòu)的幾何模型，對(duì)模型進(jìn)行適當(dāng)?shù)暮?jiǎn)化處理后，導(dǎo)入到HyperMesh軟件進(jìn)行幾何清理后，利用其前處理功能對(duì)結(jié)構(gòu)不同位置設(shè)置適合的單元類型，并建立其有限元模型，將此有限元模型通過(guò)接口文件導(dǎo)入到ANSYS中，利用其求解功能完成了結(jié)構(gòu)在自重載荷、正常工作、超載工作三種典型工況下的靜態(tài)有限元分析，每種工況又包括了臂架處于水平、上仰至極限位置、下俯至極限位置三種工作狀態(tài)，通過(guò)位移分析結(jié)果確定了結(jié)構(gòu)幾處關(guān)鍵位置的撓度，從而完成剛度校核，通過(guò)等效應(yīng)力分析結(jié)果完成了設(shè)備的強(qiáng)度校核，還對(duì)結(jié)構(gòu)的傾覆穩(wěn)定性進(jìn)行了分析。 論文還對(duì)結(jié)構(gòu)在空、滿載兩種狀態(tài)下進(jìn)行模態(tài)分析，獲得其前八階固有頻率和振型，通過(guò)對(duì)比外界激勵(lì)源頻率和固有頻率，驗(yàn)證結(jié)構(gòu)是否產(chǎn)生共振，并在模態(tài)分析的基礎(chǔ)上，運(yùn)用模態(tài)疊加法對(duì)俯仰結(jié)構(gòu)進(jìn)行諧響應(yīng)分析，進(jìn)一步得到結(jié)構(gòu)在頭部激勵(lì)作用下的幅頻響應(yīng)，并通過(guò)結(jié)果分析得到斗輪的安全轉(zhuǎn)速范圍，這些結(jié)論為設(shè)計(jì)人員了解結(jié)構(gòu)的振動(dòng)特性提供了依據(jù)。 此外，論文還對(duì)結(jié)構(gòu)的前臂架部分做出優(yōu)化改進(jìn)，以影響前臂架質(zhì)量最大的幾個(gè)尺寸因素為設(shè)計(jì)變量，在滿足一定強(qiáng)度剛度的情況下，以其總質(zhì)量最小為目標(biāo)函數(shù)，利用ANSYS Workbench的多目標(biāo)驅(qū)動(dòng)優(yōu)化技術(shù)對(duì)前臂架進(jìn)行優(yōu)化改進(jìn)，實(shí)現(xiàn)結(jié)構(gòu)的輕量化。
[Abstract]:Bucket wheel stacker is a kind of efficient continuous loading and unloading equipment, which plays a great role in some bulk storage places such as bulk loading and unloading ports, ores, coal, etc. The pitching structure is an important part of bucket wheel stacker, and its characteristic is self-important. The extension is longer, the structure and the stress are complex, its reliability and safety can not be ignored, so the rigid, strength and vibration characteristics of the bucket wheel stacker should be considered comprehensively in order to ensure the safe operation of the equipment in practice. According to the relevant technical data, the geometric model of pitching structure is established by using UG NX6.0, which is a 3D modeling software. After proper simplification of the model, it is imported into the HyperMesh software for geometric cleaning. The preprocessing function is used to set up the suitable element types for different positions of the structure, and the finite element model is established. The finite element model is imported into ANSYS through interface file, and the structure works normally under deadweight load using its solving function. Static finite element analysis under three typical working conditions, including three working states: the arm is horizontal, the arm is up to the limit position, and the limit position is bent down to the limit position. The deflection of several key positions of the structure is determined by the displacement analysis result, the stiffness check is completed, the strength check of the equipment is completed by the equivalent stress analysis result, and the overturning stability of the structure is also analyzed. The first eight natural frequencies and modes are obtained. By comparing the external excitation source frequency and the natural frequency, the resonance of the structure is verified and based on the modal analysis. The harmonic response of pitching structure is analyzed by modal superposition method, and the amplitude-frequency response of the structure under the action of head excitation is obtained, and the safe rotational speed range of bucket wheel is obtained by the result analysis. These conclusions provide a basis for designers to understand the vibration characteristics of the structure. In addition, the paper also optimizes and improves the front arm part of the structure, taking several dimensions that affect the quality of the front boom as design variables, and taking the minimum total mass as the objective function under the condition of satisfying a certain strength and stiffness. The multi-objective driving optimization technique of ANSYS Workbench is used to optimize and improve the front boom to achieve lightweight structure.
【學(xué)位授予單位】：哈爾濱工程大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2013
【分類號(hào)】：TH24

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