本文選題：液壓功率流耦合匹配系統(tǒng) + 動力參數(shù)匹配　； 參考：《青島大學》2014年碩士論文

【摘要】：近年來,作為當今主要能源的石油價格飛漲,能源問題已經(jīng)直接制約著國際經(jīng)濟的發(fā)展。液壓挖掘機作為國家基礎(chǔ)建設(shè)的主要裝備,使用范圍廣,工況復(fù)雜,工作循環(huán)中負荷劇烈變化,發(fā)動機往往工作在低效區(qū),工況惡劣,燃油經(jīng)濟性差,排放差。為了解決這一問題各國都在進行相關(guān)提高液壓挖掘機效率方面的研究。目前,混合動力技術(shù)在汽車領(lǐng)域已得到廣泛應(yīng)用,在工程機械領(lǐng)域,主要針對油電混合動力系統(tǒng)進行研究,蓄電池功率密度小,價格昂貴的缺點直接制約其發(fā)展。因此,本文提出了液壓功率流耦合匹配系統(tǒng)可最大限度的提高液壓系統(tǒng)的能量利用率,大大減少工程機械、機床工業(yè)、汽車制造、冶金礦山、航空航天等工業(yè)領(lǐng)域以及日常生活等領(lǐng)域的液壓系統(tǒng)中的能量轉(zhuǎn)換損失、能量傳輸損失和能量匹配損失,盡量用最少的能量輸入保證所需要的能量輸出。本文以液壓功率流耦合匹配系統(tǒng)為研究對象,本文的主要研究內(nèi)容共分為以下五部分： (1)通過分析研究目前液壓挖掘機節(jié)能現(xiàn)狀,以及目前液壓分流技術(shù)在工程機械領(lǐng)域中應(yīng)用出現(xiàn)的問題,提出液壓功率流耦合匹配系統(tǒng)設(shè)計方案,并提出液壓功率流耦合匹配系統(tǒng)總體設(shè)計目標。 (2)通過對液壓功率流耦合匹配系統(tǒng)關(guān)鍵部件特性進行分析,確立了液壓功率流耦合匹配系統(tǒng)關(guān)鍵部件參數(shù)匹配設(shè)計目標,并建立了發(fā)動機、雙向變量泵／馬達、液壓蓄能器的具體參數(shù)匹配方法,設(shè)計選取了液壓功率流耦合匹配系統(tǒng)關(guān)鍵部件的具體參數(shù)和型號。 (3)通過對液壓功率流耦合匹配系統(tǒng)進行結(jié)構(gòu)簡化,分析研究發(fā)動機,液壓蓄能器,雙向變量泵／馬達的力學特性、流體特性,建立液壓功率流耦合匹配系統(tǒng)關(guān)鍵部件之間的數(shù)學模型,并在MATLAB/SIMULINK中建立相應(yīng)仿真模型。 (4)在目前油電混合動力系統(tǒng)廣泛使用的單工作點、雙工作點等控制策略的基礎(chǔ)上,提出適用于液壓功率流耦合匹配系統(tǒng)的基于工況定工作點控制策略。通過對控制流程的分析,建立相應(yīng)的MATLAB/SIMULINK仿真模型。 (5)分別在重載工況、中載工況、輕載工況下驗證液壓功率流耦合匹配系統(tǒng)能夠滿足液壓挖掘機正常工作循環(huán)的動力性要求,并通過與普通液壓挖掘機同等工況下燃油量進行比較得出液壓功率流耦合匹配系統(tǒng)較普通油液挖掘機節(jié)油率在20%以上。液壓功率流耦合匹配系統(tǒng)能夠滿足設(shè)計期望的總體設(shè)計目標。
[Abstract]:In recent years, as the main energy, the oil price has skyrocketed, the energy problem has directly restricted the development of the international economy. As the main equipment of national infrastructure, hydraulic excavator has a wide range of use, complex working conditions, violent changes of load in the working cycle, and the engine often works in the low efficiency area, the working condition is bad, the fuel economy is poor, and the emission is poor. In order to solve this problem, all countries are carrying out research on improving the efficiency of hydraulic excavators. At present, hybrid power technology has been widely used in the field of automobile. In the field of construction machinery, the research is mainly focused on oil-electric hybrid power system. The low power density of battery and the disadvantages of expensive price directly restrict its development. Therefore, this paper proposes that the hydraulic power flow coupling matching system can maximize the energy utilization rate of the hydraulic system, greatly reduce the construction machinery, machine tool industry, automobile manufacturing, metallurgical mines, The energy conversion loss, energy transfer loss and energy matching loss in hydraulic system in industry such as aerospace and daily life can be guaranteed with minimum energy input. This paper takes the hydraulic power flow coupling matching system as the research object, the main research content of this paper is divided into the following five parts: 1) through the analysis and study of the current energy saving status of hydraulic excavator, As well as the problems existing in the application of hydraulic distributary technology in the field of construction machinery at present, the design scheme of hydraulic power flow coupling matching system is put forward. The overall design goal of the hydraulic power flow coupling matching system is put forward. By analyzing the characteristics of the key components of the hydraulic power flow coupling matching system, this paper analyzes the characteristics of the key components of the hydraulic power flow coupling matching system. The parameter matching design goal of the key components of the hydraulic power flow coupling matching system is established, and the specific parameter matching methods of the engine, bidirectional variable pump / motor and hydraulic accumulator are established. The specific parameters and models of the key components of the hydraulic power flow coupling matching system are selected. By simplifying the structure of the hydraulic power flow coupling matching system, the engine and the hydraulic accumulator are analyzed and studied. The mechanical and fluid characteristics of the bidirectional variable pump / motor, the mathematical model of the key components of the hydraulic power flow coupling matching system is established. The corresponding simulation model is established in MATLAB / Simulink. (4) on the basis of the control strategies such as single working point and double working point, which are widely used in oil-electric hybrid power system at present, A fixed operating point control strategy based on working condition for coupled matching system of hydraulic power flow is proposed. By analyzing the control flow, the corresponding simulation model of MATLAB / Simulink is established. Under the light load condition, it is proved that the coupling matching system of hydraulic power flow can meet the dynamic requirements of the normal working cycle of hydraulic excavator. By comparing with the conventional hydraulic excavator under the same working conditions, the results show that the hydraulic power flow coupling matching system saves more than 20% of the conventional hydraulic excavator. The hydraulic power flow coupling matching system can meet the design goal.
【學位授予單位】：青島大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TU621

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本文編號：2032401