工作機(jī)構(gòu)論文：工作機(jī)構(gòu)液壓系統(tǒng)聯(lián)合仿真整機(jī)實(shí)驗(yàn)

1、工作機(jī)構(gòu)論文：工作機(jī)構(gòu)液壓系統(tǒng)聯(lián)合仿真整機(jī)實(shí)驗(yàn)【中文摘要】傳統(tǒng)裝載機(jī)新產(chǎn)品開發(fā)周期長(zhǎng)、成本高、對(duì)產(chǎn)品的 評(píng)價(jià)需要在樣機(jī)完成后才能進(jìn)行。隨著未來裝載機(jī)高效、節(jié)能要求的 提高,機(jī)、電、液一體化復(fù)雜程度不斷加劇的特點(diǎn)，本研究以工作機(jī)構(gòu) 及其液壓系統(tǒng)作為研究重點(diǎn)，提出建立裝載機(jī)機(jī)械、液壓耦合的聯(lián)合 仿真模型方案，為裝載機(jī)的整機(jī)性能優(yōu)化、評(píng)估提供依據(jù)。主要研究 內(nèi)容如下:1.研究機(jī)械系統(tǒng)的運(yùn)動(dòng)、動(dòng)力學(xué)建模理論，基于三維實(shí)體建 模技術(shù),建立裝載機(jī)工作機(jī)構(gòu)模型，研究機(jī)構(gòu)各構(gòu)件的約束關(guān)系及系 統(tǒng)整體的運(yùn)動(dòng)驅(qū)動(dòng)關(guān)系，創(chuàng)建三維工作機(jī)構(gòu)運(yùn)動(dòng)學(xué)、動(dòng)力學(xué)仿真模型, 研究機(jī)構(gòu)工作周期內(nèi)的效能特性。2.根據(jù)液壓系統(tǒng)數(shù)學(xué)模型

2、基本方程 與實(shí)際裝載機(jī)液壓系統(tǒng)的組成與功能，應(yīng)用 EASY5 建立液壓系統(tǒng)仿真 模型。根據(jù)液壓系統(tǒng)各組成元件的結(jié)構(gòu)尺寸、性能參數(shù)，結(jié)合液壓試 驗(yàn)平臺(tái)的動(dòng)態(tài)試驗(yàn)結(jié)果，對(duì)裝載機(jī)液壓系統(tǒng)仿真模型的各元件關(guān)鍵參 數(shù)進(jìn)行驗(yàn)證，研究液壓系統(tǒng)在裝載機(jī)工作周期內(nèi)的動(dòng)態(tài)特性。3.研究機(jī)械系統(tǒng)與液壓系統(tǒng)的聯(lián)合仿真方案，根據(jù)執(zhí)行元件液壓缸的活塞動(dòng) 力學(xué)方程和工作腔壓力流量方程，建立機(jī)械系統(tǒng)與液壓系統(tǒng)間的參數(shù) 交互關(guān)系，實(shí)現(xiàn)聯(lián)合仿真。確定聯(lián)合仿真模型的定量驗(yàn)證實(shí)驗(yàn)方案，利用液壓實(shí)驗(yàn)平臺(tái)實(shí)現(xiàn)裝載機(jī)液壓系統(tǒng)流量、鏟斗工作位置及相應(yīng)的 負(fù)載控制,研究聯(lián)合仿真的可靠性。4.在聯(lián)合仿真的基礎(chǔ)上，研究裝載 機(jī)裝卸工作周期過程中，

3、不同階段的負(fù)載變化與機(jī)構(gòu)位姿變化對(duì)液壓 缸作用力的影響，以及換向閥動(dòng)作對(duì)系統(tǒng)產(chǎn)生的沖擊作用，研究鏟掘阻力的加載試驗(yàn)。機(jī)液聯(lián)合仿真的方案，綜合考慮了機(jī)械系統(tǒng)慣量和 液壓系統(tǒng)的動(dòng)態(tài)特性，改變了單一領(lǐng)域仿真的局限性，使液壓系統(tǒng)與 機(jī)械系統(tǒng)的狀態(tài)參量在動(dòng)作過程中能夠同步變化，更加真實(shí)的模擬裝 載機(jī)工作過程。所建立的聯(lián)合仿真模型，能夠部分代替整機(jī)的實(shí)物樣 機(jī)實(shí)驗(yàn),快速獲得不同工況條件下液壓系統(tǒng)動(dòng)態(tài)特性與機(jī)構(gòu)動(dòng)力學(xué)響 應(yīng),為裝載機(jī)的整機(jī)綜合優(yōu)化提供了重要參考，可以推廣應(yīng)用到裝載 機(jī)的產(chǎn)品開發(fā)過程中，豐富裝載機(jī)的特性評(píng)價(jià)方式，有效節(jié)約產(chǎn)品的 開發(fā)成本?！居⑽恼?The loader industry i

4、n our country is still in thetraditonal design and reserch modethat result in long perid and high costfor newproject development. Nowadays, in the wake of mechanicalelectronicand hydtraulic technique intergration,the wheel loader is more complex tha n ever before and the traditonalmode is hard to fi

5、t the development trend. During the backgro und thispaper studied the co-simulati on methord the n built the mech nical andhydraulical in tergratio n model that is helpful for evaluating and optimizingloader scomprehensive perfomance.1 After resrching on mechnical systemmodeli ng theory, built the 3

6、D geometry model of wheel loaders operati ng mecha nism with accurate dimensions, and the n established the dyn amic system by appl ying pysicaljoint restricts and prime moti on for mech nisms character study.2This paper studied complex hydraulic system modeling method by usingEAS Y5 accord ing to t

7、he basic equatio n of hydraulic mathematical modeland the composition and function of the real system. The parameters ofhydraulic model is determ ined by components structure size,performanee index and the hydraulic experimental platform s test results.Studying the dynamicalcharacteristics of hydrau

8、lic system in a work ing period.3 Resrch ing onmecha ni cal system and hydraulic system co-simulationmethord.Refering to hydraulic cyliner s pistondya nmic equati on and chamber pressure and flow equati ons, theparameters interaction between different system is acquired forestablishi ng in put and o

9、utput variables the n realiz ing co-simulti on. Theaccuracy of the comb ined modle is validated through the comparison thesimulation results to the phsycal loader and experime ntal platform combin atio n experime nts data, which is specially designed for flow and loadcontrolling.4Bucket resista nee whe n spad ing is loaded based to the comb inedmodel for con sideri ng the in flue nce of exter nal load vary andmechinism motion to the hydraulic force during an working piriod.Becauseof con sideri ng