【摘要】：塔式副臂連接架作為連接塔式副臂和主臂的紐帶,受力情況比較復(fù)雜,其鉸點(diǎn)的分布情況對(duì)塔式副臂的力向主臂傳遞影響較大,設(shè)計(jì)的好壞直接影響到主臂作用的發(fā)揮和整體的起重性能。目前國內(nèi)所設(shè)計(jì)的塔式副臂連接架大都沿襲了國外現(xiàn)有的結(jié)構(gòu)形式,對(duì)其具體的設(shè)計(jì)依據(jù)仍然沒有一個(gè)清晰的認(rèn)識(shí)。而且單獨(dú)對(duì)塔式副臂連接架結(jié)構(gòu)方面研究的文獻(xiàn)很少,因此研究塔式副臂連接架的鉸點(diǎn)位置對(duì)主臂的受力影響,進(jìn)而確定塔式副臂連接架的結(jié)構(gòu)型式,具有很重要的意義。 本文從力學(xué)角度出發(fā),以TZM1200型全地面起重機(jī)為例對(duì)塔式副臂連接架結(jié)構(gòu)進(jìn)行研究,找出塔式副臂連接架尺寸與主臂受力之間的關(guān)系,進(jìn)而對(duì)塔式副臂連接架結(jié)構(gòu)進(jìn)行優(yōu)化。論文主要工作內(nèi)容如下： (1)簡化并建立了全地面起重機(jī)塔式副臂工況的力學(xué)模型,并用靜力學(xué)原理對(duì)模型中的關(guān)鍵鉸點(diǎn)進(jìn)行受力分析,求出在模型簡化的條件下連接架結(jié)構(gòu)與主臂臂頭的軸向力、切向力之間的關(guān)系,進(jìn)而得出由連接架尺寸確定的主臂危險(xiǎn)截面的彎矩和應(yīng)力表達(dá)式。 (2)以塔式副臂連接架尺寸為設(shè)計(jì)變量、以主臂危險(xiǎn)截面的應(yīng)力最小為目標(biāo)函數(shù),并根據(jù)塔式副臂連接架實(shí)際結(jié)構(gòu)特點(diǎn),確定各設(shè)計(jì)變量的約束條件,最后得出優(yōu)化數(shù)學(xué)模型的一般表達(dá)式。 (3)以TZM1200型全地面起重機(jī)為例,計(jì)算四種工況下主臂危險(xiǎn)截面的應(yīng)力,選取其中應(yīng)力最大的工況作為優(yōu)化工況,并利用MATLAB優(yōu)化工具箱對(duì)其進(jìn)行優(yōu)化。將優(yōu)化后的設(shè)計(jì)變量代入其他三種工況,分別得出優(yōu)化前后主臂臂頭的軸向力和切向力、主臂危險(xiǎn)截面彎矩和應(yīng)力的對(duì)比曲線。 優(yōu)化結(jié)果表明,優(yōu)化前后主臂受力情況得到了改善,為以后的塔式副臂連接架結(jié)構(gòu)的設(shè)計(jì)提供了理論依據(jù)。
[Abstract]:As the link between the tower arm and the main arm, the stress of the tower arm is very complicated, and the distribution of the hinge point has a great influence on the transmission of the force to the main arm. The quality of the design directly affects the role of the main arm and the overall lifting performance. At present, most of the tower-type accessory-arm connecting frames designed in China follow the existing structure form of foreign countries, but there is still no clear understanding of its specific design basis. And there are few literatures on the structure of tower accessory arm connection frame, so it is very important to study the influence of hinge point position on the force of main arm, and then to determine the structure type of tower accessory arm connection frame. From the view of mechanics, this paper takes TZM1200 type all-ground crane as an example to study the structure of tower jib connecting frame, and finds out the relationship between the dimensions of tower side arm connection frame and the force on the main arm, and then optimizes the tower side arm connection frame structure. The main work of this paper is as follows: (1) the mechanical model of the tower jib working condition of all-ground crane is simplified and established, and the stress analysis of the key hinge point in the model is carried out by using the statics principle. The relationship between the connection frame structure and the axial and tangential forces of the main arm head under the condition of simplified model is obtained. Furthermore, the expressions of bending moment and stress of the dangerous section of the main arm determined by the dimensions of the connecting frame are obtained. (2) the dimensions of the tower type accessory arm are taken as the design variables, and the minimum stress of the dangerous section of the main arm is taken as the objective function. According to the actual structure characteristics of tower jib connecting frame, the constraint conditions of each design variable are determined. Finally, the general expression of optimization mathematical model is obtained. (3) taking TZM1200 type all-ground crane as an example, The stress of the dangerous section of the main arm is calculated under four working conditions. The most stress condition is selected as the optimal condition, and the optimization is carried out by using the MATLAB optimization toolbox. The optimized design variables are substituted into the other three working conditions, and the comparative curves of axial force and tangential force, bending moment and stress of the dangerous section of the main arm before and after the optimization are obtained respectively. The optimization results show that the stress of the main arm is improved before and after the optimization, which provides a theoretical basis for the design of the structure of the tower type accessory arm connecting frame in the future.
【學(xué)位授予單位】：大連理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2012
【分類號(hào)】：TH213.3

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