【作者】 范寿孝；

【导师】 王黎钦；

【作者基本信息】 哈尔滨工业大学 ， 机械设计及理论， 2008， 硕士

【摘要】 在航空航天和高新工程等复杂技术领域,揭示高温、低温、交变温度、高速重载等导致的极端温度环境下,摩擦副表面结构、润滑性能演变、摩擦副损伤和润滑失效行为之间的本质规律,建立面向航空航天、高新工程应用的润滑抗磨损材料的设计和评价方法成为行业发展的基础科学问题。本文研制了高速高低温双滚子试验机系统,可用于高速重载、高温、低温、润滑、表面状态对高速摩擦副的性能影响及机理研究。确定了试验机系统设计方案。整个系统由试验台机械系统、润滑系统、温度工况模拟、动力装置、加载系统以及测试控制系统组成。并根据机械系统方案完成了试验机系统的机械结构设计。利用Solidworks完成了双滚子试验机的三维建模,用ANSYS对试验机进行了动静特性分析。针对不同等级的温度工况,进行了试验机机体的热—应力耦合分析,与静力分析相比,应力场分布发生了很大变化,热应力已经成为影响最大应力的主要因素。根据分析结果,更换试验机机体材料为QT400-18。完成试验机机体及轴系的模态分析,发现在试验机极限转速范围内存在共振频率。通过合理设计滚子试件的结构,提高活动轴承座与下底座连接的配合精度,可避免试验机工作在危险频率内。确定了测控系统方案,采用上位机、下位机联合实现对系统的测试与控制。用PLC完成下位机软件编程,对试验机进行直接控制及监测。上位机的主控软件由组态王、VB等软件的混合编程完成,将组态王设计的组态模块作为测控软件的核心,可调用振动监测程序、PLC程序,实现系统的运行控制、数据采集与分析、监测报警等功能。完成电气系统的电路图设计,合理选择元器件,搭建了测控系统的硬件平台,并对系统进行了抗干扰的处理。对试验机系统进行安装及测控系统的性能测试,并验证了测控系统的准确性、稳定性。更多还原

【Abstract】 In the fields of aerospace, astronautics and high-tech engineering, it wouldbe the basal science subject of the industry development that revealing the lawsof nature among surface structure of friction pairs, evolution of lubrication,injury of friction pairs and lubrication failure, under the influence of extremetemperature condition which is caused by high temperature, low temperature,alternating temperature, high speed and heavy load, basing the design andevaluate methods of lubrication and friction material which would be used in thefields of aerospace,astronautics and high-tech engineering.High speed and high-low temperature two rollers testrig is developed in thispaper, which can be used for performanceand mechanism study of friction pairsunder the influence of high speed ,heavy load, high temperature, low temperature,lubrication and surface state.The scheme design of the whole test system is established. The test benchiscomposed of mechanical structure, lubrication system, simulation system oftemperature conditions, power unit, loading system and monitoring and controlsystem. Mechanical structure deign of the tester is completed according to thescheme of the structure.The 3-D module of the tester is finished by SolidWorks, of which the staticand dynamic analysis is developed by ANSYS. Compare thermal-stress analysiswith static analysis, great changes of the body’s Stress contour have taken place.Thermal stress becomes the principle factor affecting the maximum stress.According to thermal-stress analysis for different temperature conditions,QT400-18 is chosen as the material of the body. Accomplish modal analysis ofboth body and shafting and get the resonance frequency in tester’s ultimate speed.The machine can work avoiding resonance frequency with rational design ofroller sample. The matching precision between flexible housing and tester bodyshould be improved.The scheme of the monitoring and control system is established, that themonitoring and control of system is realized by both host computer and slavecomputer. PLC program can directly control the tester. The upper computer software is developed by mixed programming method of VB and KINGVIEW.Configuration module as the core of the software system, which is designed byKINGVIEW, could call vibration monitoring program and PLC program andrealize the control and monitoring alarm functions of tester.Design the electricalcircuit diagram. By choosing the reasonable electronic components, assemble thehardware system.And further more, present somemeasures of anti-interference.Accomplish the assemblage of mechanical structure. Debug the control andmonitoring system. Furthermore, feasibilityof the system is verified更多还原