本文選題：起升機構(gòu) + 制動特性��； 參考：《武漢理工大學(xué)》2012年碩士論文

【摘要】：近年來因起重機零件失效導(dǎo)致貨物失落或臂架墜落事故時有發(fā)生,在事故狀態(tài)下制動,由于制動時間較短,機械狀態(tài)變化激烈,機械系統(tǒng)將會產(chǎn)生強烈的沖擊和振動,由此可能對結(jié)構(gòu)造成破壞性的影響,目前對正常工作下的制動過程研究較為成熟,但在事故狀態(tài)下的制動特性的研究還相對較少,故在起重機事故狀態(tài)下,對制動過程的動態(tài)特性分析是十分必要的。 本文以MQ4599門座起重機起升機構(gòu)為研究對象,結(jié)合MATLAB數(shù)值仿真方法和ANSYS有限元分析方法,研究其在事故狀態(tài)下制動時的動態(tài)特性。重點討論起重機起升機構(gòu)發(fā)生事故時,其制動過程的時間、行程、動載荷,確定機械在制動時的彈性振動規(guī)律,提取制動時臂架系統(tǒng)中具有代表性部位的位移隨時間變化的歷程,從位移響應(yīng)求得各元件的應(yīng)力或應(yīng)變。 論文的主要工作包括以下幾個方面： (1)以起升機構(gòu)傳動系統(tǒng)為研究對象,分析在事故狀態(tài)下起升傳動系統(tǒng)的制動過程,計算不同事故狀態(tài)下制動過程的時間,行程及鋼絲繩張力。 (2)對實際系統(tǒng)進行合理的假設(shè)和簡化,運用少自由度模型法,建立了為三質(zhì)量三自由度的起升系統(tǒng)動力學(xué)模型。將制動過程分為兩個階段,詳細(xì)分析事故狀態(tài)下制動系統(tǒng)的振動規(guī)律,并通過MATLAB求解運動微分方程,選取合適的控制條件,求出各階段臂架及貨物位移及速度響應(yīng)曲線,分析影響系統(tǒng)振動的因素。 (3)在不同的事故條件下,制動過程中的制動時間和行程不同,起重機系統(tǒng)受的動態(tài)激勵也不同,運用ANSYS中分析并獲得臂架系統(tǒng)在不同事故狀態(tài)下的瞬態(tài)動力響應(yīng),包括動應(yīng)力和典型節(jié)點的動應(yīng)力時間歷程曲線,分析事故狀態(tài)下制動對結(jié)構(gòu)產(chǎn)生的影響。
[Abstract]:In recent years, due to the failure of parts of the crane, the loss of goods or the fall of the boom has occurred from time to time. Because of the shorter braking time and the drastic change of the mechanical state, the mechanical system will produce strong shock and vibration.This may have a destructive effect on the structure. At present, the research on the braking process under normal working conditions is more mature, but the study of braking characteristics in the accident state is relatively less, so in the crane accident state,It is necessary to analyze the dynamic characteristics of braking process.In this paper, the lifting mechanism of MQ4599 gantry crane is taken as the research object, and the dynamic characteristics of the hoisting mechanism under the condition of accident are studied by combining the MATLAB numerical simulation method and the ANSYS finite element analysis method.The braking time, stroke and dynamic load of crane hoisting mechanism are discussed in detail, and the elastic vibration law of machinery during braking is determined.The course of displacement variation with time in representative parts of the boom system during braking is extracted and the stress or strain of each component is obtained from the displacement response.The main work of the thesis includes the following aspects:In this paper, the braking process of hoisting transmission system under accident is analyzed, and the time, stroke and wire rope tension of braking process under different accident conditions are calculated.2) based on the reasonable assumption and simplification of the actual system, the dynamic model of the lifting system with three masses and three degrees of freedom is established by using the model method of less degrees of freedom.The braking process is divided into two stages. The vibration law of the braking system under the condition of accident is analyzed in detail. The differential equation of motion is solved by MATLAB, and the appropriate control conditions are selected, and the displacement and velocity response curves of the boom and cargo in each stage are obtained.The factors affecting the vibration of the system are analyzed.3) under different accident conditions, the braking time and stroke in braking process are different, and the dynamic excitation of crane system is also different. The transient dynamic response of boom system under different accident conditions is analyzed and obtained by ANSYS.The dynamic stress and the dynamic stress time history curve of typical joints are included to analyze the influence of braking on the structure under the condition of accident.
【學(xué)位授予單位】：武漢理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2012
【分類號】：TH213.4

【引證文獻】

相關(guān)碩士學(xué)位論文 前4條

1 黃凱;CWGD250型雙搖桿擦窗機結(jié)構(gòu)優(yōu)化與分析[D];沈陽建筑大學(xué);2014年

2 陶悅來;液壓變軌起重機關(guān)鍵部件的力學(xué)分析與伸縮臂的優(yōu)化設(shè)計[D];遼寧工程技術(shù)大學(xué);2014年

3 馬文文;風(fēng)機維修起重平臺數(shù)字化樣機設(shè)計研究[D];沈陽建筑大學(xué);2014年

4 齊建峰;液壓變軌起重機起升機構(gòu)研究[D];遼寧工程技術(shù)大學(xué);2013年

，

本文編號：1743140