本文選題：選煤弧形篩 + 篩板弧形座　； 參考：《太原理工大學(xué)》2015年碩士論文

【摘要】：選煤弧形篩在工作中長期承受著交變激振力和物料的沖擊、摩擦作用，其結(jié)構(gòu)或部件容易產(chǎn)生疲勞破壞，致使工作效率下降和企業(yè)經(jīng)濟效益減少。為避免疲勞破壞帶來的嚴重損傷，需要在設(shè)計階段就對其結(jié)構(gòu)或重要部件進行疲勞壽命分析。由于采用虛擬樣機技術(shù)進行疲勞壽命分析相比于傳統(tǒng)的物理樣機試驗法，具有節(jié)約人力資源、減少成本和縮短研發(fā)周期等優(yōu)點，其越來越多被應(yīng)用于研究與產(chǎn)品設(shè)計開發(fā)中。 本文的研究對象是VSB302060型選煤弧形篩，通過有限元法所得應(yīng)力結(jié)果與多體系統(tǒng)動力學(xué)仿真技術(shù)獲取的載荷時間歷程，分析其重要部件——篩板弧形座的疲勞壽命情況。 首先，在了解VSB302060型選煤弧形篩的結(jié)構(gòu)和工作原理的基礎(chǔ)上，建立篩板弧形座的有限元模型，通過施加邊界條件和載荷后，進行靜強度計算，結(jié)果表明該部件的強度滿足要求，同時獲取疲勞分析所需的應(yīng)力結(jié)果。 然后，以多參考點最小二乘復(fù)頻域法作為識別方法，運用LMS Test.lab對篩板弧形座進行模態(tài)分析，得到有利于振動的振型和固有頻率，振動電機選用該頻率對篩板弧形座進行激振，使其產(chǎn)生諧振，易于清理堵住篩縫的物料顆粒；基于拉格朗日法建立選煤弧形篩的力學(xué)模型和運動學(xué)微分方程，計算得到篩板弧形座和篩箱的位移幅值，并通過ADAMS中創(chuàng)建的多剛體系統(tǒng)模型仿真分析得到篩板弧形座和篩箱的振動位移曲線，，與理論分析結(jié)果相比較，驗證了模型的準確性，同時其結(jié)果也表明篩板弧形座的振動位移遠大于篩箱，有利于避免篩縫堵塞和減少篩箱疲勞破壞；在多剛體系統(tǒng)模型的基礎(chǔ)上，將篩板弧形座柔化處理后替換掉原來的剛性體，從而建立起選煤弧形篩的剛?cè)嵯到y(tǒng)模型，以此進行動力學(xué)仿真分析后輸出篩板弧形座疲勞分析諧振下的載荷時間歷程。 最后，使用ANSYS14.5nCode DesignLife將篩板弧形座的靜力學(xué)分析應(yīng)力結(jié)果和載荷時間歷程匹配形成以時間為變量的應(yīng)力張量，結(jié)合材料的S-N曲線，應(yīng)用Miner線性疲勞累積損傷法則，分析計算得到疲勞壽命比較小的危險位置，其循環(huán)次數(shù)為1.963109次，滿足篩分機械的使用壽命要求。 本文將有限元法和多體動力學(xué)仿真應(yīng)用于選煤弧形篩的疲勞分析中，找出了重要部件篩板弧形座的薄弱地方，并得到了其疲勞壽命，可作為結(jié)構(gòu)改進和使用維護的依據(jù)。該疲勞分析方法融合了強度分析、運動分析和疲勞分析，具有較好的可靠性和應(yīng)用性，也體現(xiàn)出使用虛擬樣機技術(shù)進行疲勞壽命分析的優(yōu)越性。
[Abstract]:For a long time in the work of coal preparation arc screen is subjected to the impact of alternating excitation force and material friction. Its structure or components are easily damaged by fatigue which results in the decline of working efficiency and the reduction of economic benefits of enterprises. In order to avoid the serious damage caused by fatigue failure, the fatigue life of the structure or important components should be analyzed in the design stage. Compared with the traditional physical prototype test method, virtual prototyping technology has the advantages of saving human resources, reducing cost and shortening research and development cycle, so it is more and more used in research and product design and development. The research object of this paper is the VSB302060 type coal preparation arc screen. The fatigue life of the sieve plate arc seat is analyzed through the stress results obtained by the finite element method and the load time history obtained by the multi-body system dynamics simulation technology. First of all, on the basis of understanding the structure and working principle of VSB302060 type coal preparation arc screen, the finite element model of sieve plate arc seat is established. The static strength is calculated by applying boundary conditions and loads. The results show that the strength of the component meets the requirements. At the same time, the stress results of fatigue analysis are obtained. Then, the multi-reference point least square complex frequency domain method is used as the identification method, and the modal analysis of the sieve plate arc seat is carried out by using LMS Test.lab, and the vibration mode and natural frequency are obtained. The vibration motor chooses this frequency to excite the sieve plate arc seat. Based on Lagrangian method, the mechanical model and kinematics differential equation of coal preparation arc screen are established, and the displacement amplitude of sieve plate arc seat and screen box is calculated. The vibration displacement curves of sieve plate arc seat and screen box are obtained by simulation analysis of multi-rigid body system model created in ADAMS, and compared with theoretical analysis results, the accuracy of the model is verified. The results also show that the vibration displacement of the sieve plate arc seat is much larger than that of the screen box, which is beneficial to avoiding the clogging of the screen seam and reducing the fatigue damage of the screen box. On the basis of the multi-rigid body system model, the original rigid body is replaced by the flexible treatment of the sieve plate arc seat. Thus, the rigid flexible system model of coal preparation arc screen is established, and the load time history under resonance analysis is analyzed after dynamic simulation and output sieve plate arc seat fatigue analysis. Finally, ANSYS14.5nCode DesignLife is used to match the static stress analysis results of the sieve plate arc seat with the loading time history to form a time-dependent stress Zhang Liang. Combined with the S-N curve of the material, the Miner linear fatigue cumulative damage rule is applied. The dangerous position with relatively small fatigue life is obtained by analysis and calculation, and the number of cycles is 1.963109, which meets the service life requirement of screening machinery. In this paper, the finite element method and multi-body dynamics simulation are applied to the fatigue analysis of coal preparation arc screen. The weakness of the arc seat of sieve plate is found, and its fatigue life is obtained, which can be used as the basis for structural improvement and maintenance. The fatigue analysis method combines strength analysis, motion analysis and fatigue analysis. It has good reliability and application, and shows the advantage of using virtual prototyping technology to analyze fatigue life.
【學(xué)位授予單位】：太原理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TD452

【參考文獻】

相關(guān)期刊論文 前10條

1 張立;仲梁維;;直線振動篩的動力學(xué)和疲勞分析[J];上海理工大學(xué)學(xué)報;2009年03期

2 譚曉明,陳躍良,金平;基于模糊可靠性的飛機結(jié)構(gòu)腐蝕疲勞壽命評定(英文)[J];Chinese Journal of Aeronautics;2005年04期

3 謝波;趙麗娟;屈岳雷;;基于ANSYS和MSC Adams協(xié)同仿真的薄煤層采煤機搖臂殼體疲勞分析[J];計算機輔助工程;2009年02期

4 王彥偉;羅繼偉;葉軍;陳立平;;基于有限元的疲勞分析方法及實踐[J];機械設(shè)計與制造;2008年01期

5 顧慶豐;鮑玉新;;振動弧形篩的應(yīng)用及技術(shù)革新[J];煤礦機械;2009年06期

6 劉升磊;陳建中;沈麗娟;何麗君;王洋;袁鵬飛;汲萬雷;王亞輝;;振動弧形篩橫梁斷裂分析及改進措施[J];煤礦機械;2010年05期

7 程志紅;王建波;;開拓選煤廠弧形篩的改造[J];煤炭加工與綜合利用;2010年03期

8 劉億,吳玲,謝廣元;淺析弧形篩和煤泥離心機配合的粗煤泥回收工藝[J];煤炭工程;2004年11期

9 王佳;潘宏俠;楊曉波;;基于PolyMAX法的齒輪箱試驗?zāi)B(tài)分析[J];機械傳動;2013年02期

10 宋維萍;張東晨;張恒;羅曉玲;桂洋洋;;新型橢圓振動弧形篩的研究[J];煤礦機械;2013年10期

本文編號：1891128