本文選題：工作機(jī)構(gòu) + 液壓系統(tǒng)��； 參考：《集美大學(xué)》2011年碩士論文

【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(lái)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?jī)?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,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。
[Abstract]:The new product development cycle of traditional loader is long and the cost is high. With the characteristics of high efficiency and energy saving of loader in the future, and the increasing complexity of integration of machine, electricity and liquid, this study focuses on the working mechanism and its hydraulic system, and puts forward the establishment of loader machinery. The combined simulation model of hydraulic coupling provides the basis for the performance optimization and evaluation of the loader. The main contents are as follows: 1. The kinematics and dynamics modeling theory of mechanical system is studied. Based on 3D solid modeling technology, the working mechanism model of loader is established, and the constraint relation of each component of the mechanism and the motion driving relation of the whole system are studied. The kinematics and dynamics simulation model of three dimensional working mechanism is established to study the efficiency characteristics in the working cycle of the mechanism. 2. According to the basic equations of the hydraulic system mathematical model and the composition and function of the hydraulic system of the actual loader, the simulation model of the hydraulic system is established by using EASY5. According to the structural size and performance parameters of each component of hydraulic system, combined with the dynamic test results of hydraulic test platform, the key parameters of the hydraulic system simulation model of loader are verified. Study on dynamic characteristics of hydraulic system in Loader working cycle. 3. The joint simulation scheme of mechanical system and hydraulic system is studied. According to the piston dynamic equation and pressure flow equation of actuator cylinder, the interaction of parameters between mechanical system and hydraulic system is established, and the joint simulation is realized. The quantitative verification experiment scheme of joint simulation model is determined. The flow rate of loader hydraulic system, the working position of bucket and the corresponding load control are realized by using hydraulic experimental platform, and the reliability of joint simulation is studied. 4. On the basis of joint simulation, the influence of load change and mechanism position change on hydraulic cylinder force in different stages during loading and unloading working cycle of loader and the impact of reversing valve action on the system are studied. The loading test of the resistance of shovel is studied. In the scheme of combined simulation, the inertia of mechanical system and the dynamic characteristic of hydraulic system are considered synthetically, and the limitation of single field simulation is changed, so that the state parameters of hydraulic system and mechanical system can change synchronously in the course of action. More realistic simulation of the loader working process. The established joint simulation model can partly replace the physical prototype experiment of the whole machine and obtain the dynamic characteristics of hydraulic system and the dynamic response of the mechanism under different working conditions, which provides an important reference for the comprehensive optimization of the loader. It can be popularized and applied to the product development process of loader, enrich the characteristic evaluation method of loader, and save the cost of product development effectively.
【學(xué)位授予單位】：集美大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2011
【分類號(hào)】：TH243

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