【摘要】：隨著我國(guó)薄煤層資源開采量的日益提高,薄煤層采煤機(jī)的工作安全可靠性變得尤為重要,由于工作環(huán)境惡劣,薄煤層采煤機(jī)在工作過(guò)程中會(huì)產(chǎn)生劇烈的振動(dòng)以及隨之而來(lái)的噪聲、瞬時(shí)沖擊力引起的局部破壞、長(zhǎng)時(shí)間運(yùn)行導(dǎo)致的高溫膠合變形等問(wèn)題,以上種種現(xiàn)象會(huì)加速采煤機(jī)的疲勞破壞,對(duì)操作人員的安全造成威脅。因此,利用虛擬樣機(jī)技術(shù)模擬真實(shí)環(huán)境下的采煤機(jī)工作狀態(tài),分析研究其動(dòng)態(tài)特性及結(jié)構(gòu)強(qiáng)度可以有效地解決上述問(wèn)題或提早對(duì)問(wèn)題進(jìn)行預(yù)測(cè),避免不必要的損失。本文以某新型薄煤層采煤機(jī)為研究對(duì)象,以多體動(dòng)力學(xué)理論、振動(dòng)學(xué)理論、多場(chǎng)耦合分析理論等為基礎(chǔ),利用Pro/E.ADAMS和ANSYS Workbench等軟件實(shí)現(xiàn)了對(duì)新型薄煤層采煤機(jī)截割部殼體的協(xié)同仿真。為研究采煤機(jī)工作時(shí)的穩(wěn)定性,對(duì)截割部殼體進(jìn)行了模態(tài)分析和諧響應(yīng)分析,得到殼體的固有模態(tài)、相應(yīng)振型和正弦載荷激勵(lì)下殼體關(guān)鍵位置的位移響應(yīng)曲線,與截割部各種激勵(lì)頻率進(jìn)行比較分析,得到采煤機(jī)截割部殼體振動(dòng)特性與激勵(lì)頻率的關(guān)系�？紤]到采煤機(jī)工作過(guò)程中可能出現(xiàn)的強(qiáng)度不足等問(wèn)題,對(duì)殼體進(jìn)行了熱-結(jié)構(gòu)耦合分析,首先通過(guò)計(jì)算齒輪摩擦發(fā)熱、軸承摩擦發(fā)熱、齒輪攪油發(fā)熱、油封摩擦發(fā)熱等對(duì)截割部進(jìn)行熱分析,得到殼體的溫度分布云圖,在此基礎(chǔ)上進(jìn)行熱-結(jié)構(gòu)耦合分析,得到殼體的應(yīng)力及變形云圖,并與未考慮溫度場(chǎng)時(shí)的分析結(jié)果進(jìn)行比較,得到了溫度場(chǎng)對(duì)殼體結(jié)構(gòu)強(qiáng)度的影響。對(duì)殼體進(jìn)行疲勞壽命預(yù)測(cè),將疲勞壽命不足位置進(jìn)行結(jié)構(gòu)優(yōu)化改進(jìn),增大部分過(guò)渡圓角半徑后的殼體應(yīng)力集中明顯消失,熱-結(jié)構(gòu)耦合應(yīng)力減小,疲勞壽命顯著提高,可以滿足惡劣工況下的使用需求。本文研究采煤機(jī)截割部殼體可靠性時(shí),全面考慮了殼體動(dòng)態(tài)特性和多場(chǎng)耦合條件下殼體的結(jié)構(gòu)剛度和強(qiáng)度,使分析預(yù)測(cè)更加準(zhǔn)確可靠,為采煤機(jī)截割部殼體的動(dòng)態(tài)特性研究及多場(chǎng)耦合分析提供了新的方法。
[Abstract]:With the increasing exploitation of thin coal seam resources in our country, the safety and reliability of thin coal seam shearer becomes more and more important, because of the bad working environment. In the working process of thin coal seam shearer, it will produce violent vibration and noise, local damage caused by instantaneous impact force, high temperature gluing deformation caused by long time operation, and so on. The above phenomena will accelerate the fatigue damage of shearer and threaten the safety of operators. Therefore, using virtual prototyping technology to simulate the working state of shearer in real environment, analyzing and studying its dynamic characteristics and structural strength can effectively solve the above problems or predict the problems earlier, and avoid unnecessary losses. In this paper, a new type of thin coal seam shearer is taken as the research object, based on multi-body dynamics theory, vibration theory, multi-field coupling analysis theory, etc. The collaborative simulation of the cutting part shell of a new thin coal seam shearer is realized by using Pro/E.ADAMS and ANSYS Workbench software. In order to study the stability of the shearer, the modal analysis of the cutting part shell is carried out, and the natural mode, the displacement response curve of the critical position of the shell under the excitation of the corresponding mode and the sinusoidal load are obtained. The vibration characteristics of the shell of the cutting part of the shearer are compared with the excitation frequency of the cutting part, and the relation between the vibration characteristics and the excitation frequency is obtained. Considering the problem of insufficient strength in the shearer, the thermal-structural coupling analysis of the shell is carried out. Firstly, the friction heat of the gear, the friction heat of the bearing and the heat of the oil stirring of the gear are calculated. The thermal analysis of the cutting part was carried out, and the temperature distribution cloud diagram of the shell was obtained. On this basis, the thermo-structural coupling analysis was carried out, and the stress and deformation cloud diagrams of the shell were obtained, and the results were compared with the analysis results without considering the temperature field. The influence of temperature field on the strength of shell structure is obtained. The fatigue life of the shell is predicted, and the structure of the shell with insufficient fatigue life is optimized and improved. The stress concentration of the shell decreases obviously after increasing the partial transition radius, the coupling stress of the thermal-structure decreases, and the fatigue life of the shell increases significantly. Can satisfy the use demand under the bad working condition. In this paper, the dynamic characteristics of the shell and the structural stiffness and strength of the shell under the condition of multi-field coupling are considered in order to make the analysis and prediction more accurate and reliable when the reliability of the cutting part shell of the shearer is studied. It provides a new method for the study of dynamic characteristics and multi-field coupling analysis of cutting part shell of shearer.
【學(xué)位授予單位】：遼寧工程技術(shù)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TD421.6

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