本文選題：起重機(jī) + 起升系統(tǒng)�。� 參考：《吉林大學(xué)》2011年碩士論文

【摘要】：起重機(jī)是工程機(jī)械重要的組成部分,在城建、水利、礦場(chǎng)和國(guó)防等工程領(lǐng)域中都有著廣泛的應(yīng)用。但當(dāng)前對(duì)于起升系統(tǒng)的設(shè)計(jì)優(yōu)化,往往還停留在依托經(jīng)驗(yàn)和樣機(jī)試驗(yàn)的方法,不但存在設(shè)計(jì)周期長(zhǎng)的缺點(diǎn),設(shè)計(jì)不準(zhǔn)確以及財(cái)物浪費(fèi)也是不得不面對(duì)的問(wèn)題。 在起重機(jī)液壓系統(tǒng)的設(shè)計(jì)過(guò)程中除了要分析靜態(tài)特性,還要考慮動(dòng)態(tài)特性是否滿足系統(tǒng)工作需求,而起升系統(tǒng)作為起重機(jī)的核心系統(tǒng),其動(dòng)態(tài)性能的好壞直接影響起重機(jī)整機(jī)的工作性能,故對(duì)起升系統(tǒng)的研究就十分必要。在建立正確的仿真模型后,利用仿真手段得到系統(tǒng)內(nèi)各液壓元件相關(guān)參數(shù)對(duì)系統(tǒng)動(dòng)態(tài)響應(yīng)特性的影響,在分析仿真曲線基礎(chǔ)上,通過(guò)改變液壓元件參數(shù)達(dá)到優(yōu)化系統(tǒng)動(dòng)態(tài)響應(yīng)特性的目的。即首先準(zhǔn)確建立數(shù)字化系統(tǒng)虛擬樣機(jī),選取一種合適的優(yōu)化方法修正各個(gè)尺寸參數(shù)以使其動(dòng)態(tài)特性達(dá)到整體最優(yōu)。本課題就是基于以上思想,以起重機(jī)起升系統(tǒng)為研究對(duì)象,依托AMESim軟件平臺(tái),進(jìn)行仿真分析和優(yōu)化設(shè)計(jì)。 本文的核心思想在于提出在設(shè)計(jì)完成后先對(duì)系統(tǒng)進(jìn)行計(jì)算機(jī)仿真,初步了解液壓系統(tǒng)運(yùn)行時(shí)的各種特性,并對(duì)設(shè)計(jì)不合理之處進(jìn)行優(yōu)化設(shè)計(jì),從而減少設(shè)計(jì)的盲目性,確保試車時(shí)的安全性和穩(wěn)定性,并縮短設(shè)計(jì)周期,提高經(jīng)濟(jì)效益。 基于此,本文研究首先論述了起重機(jī)起升系統(tǒng)存在的二次起升現(xiàn)象及解決二次起升現(xiàn)象的基本途徑。此后介紹了起升機(jī)構(gòu)的幾種典型型式及常見的起升液壓原理圖,在此基礎(chǔ)上提出本課題研究的液壓系統(tǒng)原理圖,根據(jù)系統(tǒng)性能需求,計(jì)算得到相關(guān)技術(shù)匹配參數(shù)。然后,建立了基于功率鍵合圖方法的液壓起重機(jī)動(dòng)力學(xué)模型,并推導(dǎo)出起升機(jī)構(gòu)起升回路的數(shù)學(xué)模型。最后依托AMESim軟件平臺(tái)以及實(shí)驗(yàn)曲線,建立并修正起升液壓系統(tǒng)仿真模型,分析了影響系統(tǒng)動(dòng)態(tài)特性的主要因素,并進(jìn)一步對(duì)起升系統(tǒng)重要部件平衡閥進(jìn)行優(yōu)化,并且在仿真模型中驗(yàn)證優(yōu)化的可行性。
[Abstract]:Crane is an important part of construction machinery. It is widely used in urban construction, water conservancy, mine and national defense. However, at present, the design optimization of hoisting system often depends on the experience and the method of prototype test, which not only has the shortcoming of long design period, but also has to face the problem of inaccurate design and waste of property. In the design process of the hydraulic system of crane, besides analyzing static characteristic, it is necessary to consider whether the dynamic characteristic meets the requirement of the system, and the hoisting system is the core system of crane. Its dynamic performance directly affects the working performance of the whole crane, so it is necessary to study the hoisting system. After the establishment of the correct simulation model, the influence of the relative parameters of the hydraulic components on the dynamic response characteristics of the system is obtained by means of simulation. Based on the analysis of the simulation curve, The dynamic response characteristics of the system can be optimized by changing the parameters of hydraulic components. That is to say, firstly, the virtual prototype of the digital system is built accurately, and a suitable optimization method is selected to modify the parameters of each dimension to achieve the overall optimal dynamic characteristics. This subject is based on the above idea, the crane hoisting system as the research object, relying on the AMESim software platform, simulation analysis and optimization design. The core idea of this paper is to carry on the computer simulation to the system after the design is completed, to understand the various characteristics of the hydraulic system when it is running, and to optimize the design for the unreasonable design, so as to reduce the blindness of the design. To ensure the safety and stability, shorten the design cycle and improve economic efficiency. Based on this, this paper first discusses the secondary hoisting phenomenon of crane hoisting system and the basic ways to solve the secondary hoisting phenomenon. After that, several typical types of hoisting mechanism and common lifting hydraulic schematic diagram are introduced. On this basis, the hydraulic system schematic diagram studied in this paper is put forward. According to the system performance requirements, relevant technical matching parameters are calculated. Then, the dynamic model of hydraulic crane based on power bond graph method is established, and the mathematical model of hoisting loop of hoisting mechanism is derived. Finally, based on the AMESim software platform and experimental curve, the simulation model of hoisting hydraulic system is established and revised, and the main factors affecting the dynamic characteristics of the system are analyzed, and the balance valve of the important part of the hoisting system is further optimized. The feasibility of the optimization is verified in the simulation model.
【學(xué)位授予單位】：吉林大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2011
【分類號(hào)】：TH213.6

【引證文獻(xiàn)】

相關(guān)碩士學(xué)位論文 前1條

1 劉永平;閉式液壓系統(tǒng)二次起升動(dòng)態(tài)特性仿真與分析[D];大連理工大學(xué);2012年

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本文編號(hào)：1776642