动态加载的活塞环—缸套小样往复摩擦试验机研制

发布时间：2018-02-09 03:53

本文关键词： 活塞环-缸套摩擦磨损往复试验机动态加载　出处：《合肥工业大学》2015年硕士论文　论文类型：学位论文

【摘要】：活塞环-缸套作为内燃机中最重要的一对摩擦副,对发动机的动力性、经济性、可靠性、耐久性有着极大的影响。活塞环-缸套的摩擦损失占到发动机总机械损失的45%-65%。由此可见,研究活塞环-缸套这对摩擦副对提高发动机性能,降低能量损失有着不可取代的重要作用。活塞环-缸套这对摩擦副的实际工况较为复杂,高温、动载荷、大行程、润滑条件不足等因素都对其磨损和失效造成不可忽视的影响。因此,研制一台能更好模拟实际工况的试验机就显得尤为重要。现有的活塞环-缸套试验机对工况的模拟都不全面,尤其是对于气缸缸压变化带来的径向动载荷都没有考虑,是共有的不足。针对现有活塞环-缸套试验机存在的不足之处,本文利用AutoCAD、Solid Workss、ANSYS等计算机辅助设计软件设计了试验机的机械结构,该试验机的往复运动行程为90mm,往复运动频率可以在0-10Hz之间无极调节,试件周围环境温度可加热到最高300摄氏度,径向载荷实现了动态加载；利用现代可编程控制器、组态软件及传感器技术设计了试验机的测试和控制系统,能过对往复频率和加热温度进行精确控制,并实时采集,显示和保存摩擦力,载荷,试件表面温度,环境温度等试验参数。最后,基于LabVEW开发了动态信号处理程序,用于动态测试信号的处理和分析。本试验机可以实现往复运动频率和加热温度的精确控制,同时实时采集,显示和保存载荷,摩擦力,环境温度,试件表面温度等试验参数,操作方便,界面简洁,稳定可靠。
[Abstract]:Piston ring-cylinder liner is the most important pair of friction pairs in internal combustion engine. The friction loss of piston ring and cylinder liner accounts for 45% -65% of the total mechanical loss of the engine. Thus, it can be seen that the study on the friction pair of piston ring cylinder liner can improve the performance of the engine. Reducing energy loss plays an irreplaceable role. The piston ring and cylinder liner are more complicated to the actual working conditions of friction pair. The factors such as high temperature, dynamic load, large stroke and insufficient lubrication conditions all have an important effect on the wear and failure of the friction pair. It is particularly important to develop a testing machine that can better simulate the actual working conditions. The existing piston ring and cylinder liner test machines do not fully simulate the operating conditions, especially for the radial dynamic load caused by the change of cylinder pressure. Is a common deficiency. In view of the shortcomings of the existing piston ring cylinder liner testing machine, the mechanical structure of the testing machine is designed by using the CAD software, such as AutoCAD solid work ANSYS, etc. The reciprocating stroke of the tester is 90 mm, the frequency of reciprocating motion can be adjusted in the range of 0-10 Hz, the ambient temperature of the specimen can be heated to a maximum of 300 degrees Celsius, the radial load is dynamically loaded, and the modern programmable controller is used. Configuration software and sensor technology have designed the test and control system of the testing machine, which can accurately control the reciprocating frequency and heating temperature, and can collect, display and store the friction force, load and surface temperature of the specimen in real time. Finally, a dynamic signal processing program based on LabVEW is developed for dynamic signal processing and analysis. This testing machine can realize the accurate control of reciprocating motion frequency and heating temperature. At the same time, it can collect, display and save the load, friction force, environment temperature, sample surface temperature and other test parameters in real time. The operation is convenient, the interface is simple, and the interface is stable and reliable.
【学位授予单位】：合肥工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TK403

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