發(fā)布時(shí)間：2018-01-03 21:01

  本文關(guān)鍵詞：基于LabVIEW電液伺服同步系統(tǒng)研究　出處：《哈爾濱工業(yè)大學(xué)》2012年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 同步系統(tǒng) LabVIEW 建模仿真 二分補(bǔ)償 PID控制

【摘要】：隨著現(xiàn)代機(jī)械制造加工、航空航天、水利水電和建筑等領(lǐng)域的快速發(fā)展，對多缸控制系統(tǒng)的同步精度需求也越來越高。但由于泄漏、加工精度以及控制元件間性能的差距，必然導(dǎo)致多缸系統(tǒng)不同步，如果不能采取有效措施加以控制，克服這種同步誤差，控制系統(tǒng)將不能正常工作。因此需要在正確的理論分析基礎(chǔ)上，設(shè)計(jì)良好的液壓同步控制系統(tǒng)具有非常重要的實(shí)際意義。 本文在查閱大量國內(nèi)外相關(guān)文獻(xiàn)的基礎(chǔ)上，綜述了液壓同步技術(shù)、虛擬儀器技術(shù)的研究現(xiàn)狀、液壓同步系統(tǒng)組成的形式、特點(diǎn)及其應(yīng)用，并介紹了同步控制策略的發(fā)展?fàn)顩r。 電液伺服閥由于其高頻響、高精度等優(yōu)點(diǎn)被廣泛應(yīng)用于液壓同步系統(tǒng)中。本文以兩缸同步為研究對象，設(shè)計(jì)了采用電液伺服閥的液壓同步系統(tǒng)，對該同步系統(tǒng)的組成以及控制原理進(jìn)行了理論研究，分別建立了系統(tǒng)的線性和非線性數(shù)學(xué)模型，采用LabVIEW軟件中Control and Simulation工具包搭建了仿真模型，進(jìn)行仿真對比兩種建模方式，得出非線性建模能夠更好地反映實(shí)際系統(tǒng)的動態(tài)特性。 詳細(xì)分析了同等方式和主從方式的同步控制原理，分別搭建了非線性仿真模型，根據(jù)系統(tǒng)特點(diǎn)采用了二分同步補(bǔ)償算法，，并對階躍信號、斜坡信號以及不同頻率正弦信號進(jìn)行了仿真，對系統(tǒng)的同步精度和動態(tài)性能進(jìn)行理論分析；為了得到更高的同步精度，在二分法的基礎(chǔ)上設(shè)計(jì)了PID控制器對偏差信號進(jìn)行控制；針對同步算法不能改善系統(tǒng)動態(tài)性能的缺點(diǎn)，在同步算法的基礎(chǔ)上，對單套系統(tǒng)設(shè)計(jì)了PID控制器，仿真結(jié)果表明采用PID控制器不但改善了系統(tǒng)的動態(tài)跟蹤特性，而且還一定程度上提高同步精度。 本文完成了泵源、動力機(jī)構(gòu)以及測控系統(tǒng)的設(shè)計(jì)，搭建了液壓同步控制系統(tǒng)試驗(yàn)臺，采用LabVIEW軟件完成測控軟件的編寫，實(shí)現(xiàn)了液壓實(shí)驗(yàn)臺的實(shí)時(shí)監(jiān)測、過程控制以及數(shù)據(jù)后處理等功能。對控制策略進(jìn)行了實(shí)驗(yàn)驗(yàn)證，驗(yàn)證了仿真結(jié)果的正確性，最后還針對變幅值、變負(fù)載以及變供油壓力等不同工況進(jìn)行了實(shí)驗(yàn)研究。本研究對水輪機(jī)調(diào)速器、圓筒閥以及沖擊式水輪機(jī)噴針控制系統(tǒng)的設(shè)計(jì)有一定指導(dǎo)意義，為更深的理論研究打下基礎(chǔ)。
[Abstract]:With the rapid development of modern mechanical manufacturing, aerospace, water conservancy and hydropower and architecture, the need for synchronization accuracy of multi-cylinder control system is becoming higher and higher, but due to leakage. Machining accuracy and performance gap between control components will inevitably lead to multi-cylinder system synchronization, if effective measures can not be taken to control, to overcome this synchronization error. The control system will not work properly, so it is necessary to design a good hydraulic synchronous control system on the basis of correct theoretical analysis. On the basis of consulting a large number of domestic and foreign literatures, this paper summarizes the research status of hydraulic synchronization technology, virtual instrument technology, the form, characteristics and application of hydraulic synchronization system. The development of synchronous control strategy is also introduced. Electro-hydraulic servo valve is widely used in hydraulic synchronization system because of its high frequency response and high precision. This paper designs a hydraulic synchronous system with electro-hydraulic servo valve as the research object. The composition and control principle of the synchronous system are studied theoretically, and the linear and nonlinear mathematical models of the system are established respectively. The simulation model is built by using Control and Simulation toolkit in LabVIEW software, and the two modeling methods are compared with each other. It is concluded that nonlinear modeling can better reflect the dynamic characteristics of the actual system. The synchronization control principle of the same mode and master-slave mode is analyzed in detail, and the nonlinear simulation model is built, and the binary synchronization compensation algorithm is adopted according to the characteristics of the system, and the step signal is analyzed. The slope signals and sinusoidal signals with different frequencies are simulated, and the synchronization accuracy and dynamic performance of the system are analyzed theoretically. In order to achieve higher synchronization accuracy, a PID controller is designed to control the deviation signal based on the dichotomy. Aiming at the shortcoming that the synchronization algorithm can not improve the dynamic performance of the system, a PID controller is designed for a single system based on the synchronization algorithm. The simulation results show that the PID controller not only improves the dynamic tracking characteristics of the system, but also improves the synchronization accuracy to some extent. In this paper, the pump source, power mechanism and measurement and control system are designed, the hydraulic synchronous control system test bed is built, and the LabVIEW software is used to compile the measurement and control software. The real-time monitoring, process control and data post-processing of the hydraulic test bench are realized. The control strategy is verified by experiments, and the correctness of the simulation results is verified. Experimental study on variable load and variable fuel supply pressure is carried out. This study has certain guiding significance for the design of hydraulic turbine governor, cylinder valve and impingement turbine injection needle control system. Lay the foundation for further theoretical research.
【學(xué)位授予單位】：哈爾濱工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2012
【分類號】：TP273;TH137

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