本文關(guān)鍵詞： 塑料窨井蓋 碾壓疲勞 電液技術(shù) 數(shù)字控制 系統(tǒng)設(shè)計　出處：《昆明理工大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：檢查井俗稱窨井,窨井蓋是窨井的地面設(shè)施。將塑料材質(zhì)用于窨井蓋的制作是近年來出現(xiàn)的一種趨勢。由于塑料窨井蓋具有節(jié)能、環(huán)保和可回收利用的優(yōu)點,恰合可持續(xù)發(fā)展的需要。但是對塑料窨井蓋相應(yīng)檢測還不完善,由于塑料材質(zhì)的問題,需對塑料窨井蓋進(jìn)行碾壓疲勞試驗。本文以塑料窨井蓋碾壓疲勞試驗系統(tǒng)為研究對象,針對塑料窨井蓋的實際工況,設(shè)計了碾壓疲勞試驗實施方案,將電液數(shù)字控制技術(shù)應(yīng)用于塑料窨井蓋碾壓疲勞試驗系統(tǒng)中,采用增量式數(shù)字閥設(shè)計了電液數(shù)字加載力和速度控制系統(tǒng)。論文闡述了塑料窨井蓋因其諸多優(yōu)點而得到廣泛的應(yīng)用,由于其材質(zhì)特殊,引出了對塑料窨井蓋進(jìn)行碾壓疲勞試驗的必要性。通過對試驗機(jī)加載方式、發(fā)展現(xiàn)狀以及發(fā)展趨勢的分析,指出對價格便宜、性能滿足要求的試驗設(shè)備的需求。通過對直接式、間接式電液數(shù)字控制技術(shù)的對比,指出直接式數(shù)字控制技術(shù)發(fā)展的前景。根據(jù)塑料窨井蓋實際使用中的受力狀況,結(jié)合生產(chǎn)廠家的要求以及文獻(xiàn)中對檢測參數(shù)的設(shè)置,明確了試驗的實現(xiàn)方案和主要參數(shù),并設(shè)計了電液數(shù)字控制系統(tǒng)。通過對增量式數(shù)字閥、液壓泵、液壓缸、傳感器等的選型,忽略系統(tǒng)中的非關(guān)鍵因素,建立了速度控制與加載壓力控制的數(shù)學(xué)模型。應(yīng)用MATLAB/Simulink仿真軟件對分別對速度控制系統(tǒng)和加載壓力控制系統(tǒng)的動態(tài)響應(yīng)與穩(wěn)態(tài)響應(yīng)進(jìn)行了仿真分析。采用模糊控制算法與PID校正相串聯(lián)的方式,設(shè)計了模糊PID控制器,提高了系統(tǒng)的響應(yīng)速度和穩(wěn)定性,降低了系統(tǒng)的超調(diào)量和穩(wěn)態(tài)誤差,確保了控制系統(tǒng)滿足設(shè)計的要求。仿真表明,采用增量式數(shù)字閥設(shè)計的電液控制加載系統(tǒng)運(yùn)行穩(wěn)定,超調(diào)量小,響應(yīng)速度快,穩(wěn)態(tài)誤差小,滿足對塑料窨井蓋碾壓疲勞試驗的要求。
[Abstract]:Inspection well is commonly called scenting well, scenting well cover is the surface facility of scenting well. It is a trend in recent years to use plastic material to make scenting well cap. Because plastic scenting well cover has the advantages of energy saving, environmental protection and recyclability, But the testing of plastic scenting well cover is not perfect. Due to the problem of plastic material, the rolling fatigue test of plastic scenting well cover is needed. This paper takes the plastic scenting well cover rolling fatigue test system as the research object. According to the actual working condition of plastic scenting well cover, a scheme of roller compaction fatigue test is designed. The electro-hydraulic digital control technology is applied to the rolling fatigue test system of plastic scenting well cover. The electro-hydraulic digital loading force and speed control system is designed by using incremental digital valve. The plastic scenting well cover is widely used because of its many advantages, because of its special material. The necessity of rolling fatigue test on plastic scenting well cover is introduced. Through the analysis of the loading mode, development status and development trend of the testing machine, it is pointed out that the demand for the test equipment with cheap price and performance satisfying the requirements is pointed out. Compared with indirect electro-hydraulic digital control technology, the development prospect of direct digital control technology is pointed out. According to the stress condition in actual use of plastic scenting well cover, combined with the requirements of the manufacturer and the setting of testing parameters in the literature, The realization scheme and main parameters of the test are defined, and the electro-hydraulic digital control system is designed. By selecting the incremental digital valve, hydraulic pump, hydraulic cylinder, sensor and so on, the non-key factors in the system are ignored. The mathematical models of speed control and loading pressure control are established. The dynamic and steady response of speed control system and loading pressure control system are simulated by MATLAB/Simulink software. Fuzzy control is used to simulate the dynamic response and steady state response of the speed control system and the loading pressure control system respectively. The way the algorithm is concatenated with the PID correction phase, A fuzzy PID controller is designed, which improves the response speed and stability of the system, reduces the overshoot and steady-state error of the system, and ensures that the control system meets the design requirements. The electro-hydraulic control loading system designed by incremental digital valve is stable in operation, small in overshoot, fast in response speed and small in steady-state error, which meets the requirement of rolling fatigue test for plastic scenting well cover.
【學(xué)位授予單位】：昆明理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TQ320.7;TP273

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