塑料窨井盖碾压疲劳试验控制系统研究

发布时间：2018-02-10 07:45

本文关键词： 塑料窨井盖碾压疲劳电液技术数字控制系统设计　出处：《昆明理工大学》2017年硕士论文　论文类型：学位论文

【摘要】：检查井俗称窨井,窨井盖是窨井的地面设施。将塑料材质用于窨井盖的制作是近年来出现的一种趋势。由于塑料窨井盖具有节能、环保和可回收利用的优点,恰合可持续发展的需要。但是对塑料窨井盖相应检测还不完善,由于塑料材质的问题,需对塑料窨井盖进行碾压疲劳试验。本文以塑料窨井盖碾压疲劳试验系统为研究对象,针对塑料窨井盖的实际工况,设计了碾压疲劳试验实施方案,将电液数字控制技术应用于塑料窨井盖碾压疲劳试验系统中,采用增量式数字阀设计了电液数字加载力和速度控制系统。论文阐述了塑料窨井盖因其诸多优点而得到广泛的应用,由于其材质特殊,引出了对塑料窨井盖进行碾压疲劳试验的必要性。通过对试验机加载方式、发展现状以及发展趋势的分析,指出对价格便宜、性能满足要求的试验设备的需求。通过对直接式、间接式电液数字控制技术的对比,指出直接式数字控制技术发展的前景。根据塑料窨井盖实际使用中的受力状况,结合生产厂家的要求以及文献中对检测参数的设置,明确了试验的实现方案和主要参数,并设计了电液数字控制系统。通过对增量式数字阀、液压泵、液压缸、传感器等的选型,忽略系统中的非关键因素,建立了速度控制与加载压力控制的数学模型。应用MATLAB/Simulink仿真软件对分别对速度控制系统和加载压力控制系统的动态响应与稳态响应进行了仿真分析。采用模糊控制算法与PID校正相串联的方式,设计了模糊PID控制器,提高了系统的响应速度和稳定性,降低了系统的超调量和稳态误差,确保了控制系统满足设计的要求。仿真表明,采用增量式数字阀设计的电液控制加载系统运行稳定,超调量小,响应速度快,稳态误差小,满足对塑料窨井盖碾压疲劳试验的要求。
[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.
【学位授予单位】：昆明理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TQ320.7;TP273

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