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考虑摩擦和间隙影响的机床进给伺服系统建模与分析(Modeling and Analysis of Machine Tool Feed Servo Systems with Friction and Backlash)
机床 进给伺服系统 摩擦
2010/12/28
进给伺服系统的性能对数控机床的跟踪及定位精度、加工质量等有着重要的作用。摩擦和间隙的非线性会导致系统的爬行、振荡等不稳定行为。针对闭环控制的直联式进给伺服系统,建立了考虑摩擦和间隙的综合力学模型和数学模型。研究了低速进给条件下摩擦和间隙非线性对工作台输出的影响,得出了工作台产生爬行现象的几种可能条件,并给出消除进给系统爬行现象的几种常见措施。所得结论为进给伺服系统的优化设计和性能预测提供了理论支持...
Exploitation of Hertz抯 contact pressures in friction drives
contact pressures friction drive Hertz抯 pressures pitting friction force Mohr抯 circles
2014/2/26
The paper is intent on the applications of equations which describe the Hertz抯 surface pressures in friction drives. In the paper the reduced equations are derived, which are useful to the surface pre...
激光微造型凸轮副的摩擦磨损(Friction and Wear of Cam with Laser Micro-texture under Lubrication)
凸轮 激光微造型 几何形貌
2010/1/28
采用UMT-2多功能摩擦磨损实验机,模拟内燃机凸轮/滚轮工况条件,考察了多种激光微造型形貌试样表面的摩擦磨损特性。实验结果发现,与未处理光滑表面相比,激光微造型试样表面的耐磨、抗擦伤性显著提高,其中,凹坑造型表面的摩擦因数显著下降,而凹槽表面的摩擦因数相对较大。这说明凹槽形貌会增大表面摩擦,而凹坑形貌具有一定的减摩效果。合理选择凹坑的深度及其面积占有率,并进行微形貌几何参数的优化组合,可达到最佳减...
考虑粘滑摩擦的时变振动系统模态参数辨识(Modal Parameter Identification of Time Varying Vibration Systems Subjected to Stick-slip Friction)
时变系统 模态参数 时变多变量Prony法
2010/1/28
将摩擦因素引入时变振动系统的模态辨识中。采用时变多变量Prony法,对振动系统的多输出响应信号建立时变多变量Prony模型,并利用递推最小二乘法估计模型参数,提取出振动系统的模态特征信息。数值仿真中,对含复合频率信号的频率进行了辨识,辨识值与理论值较好的吻合性验证了该方法的有效性。应用实例中,对平面两杆操作臂中的滑动质量块建立了考虑LuGre摩擦的运动方程,利用时变多变量Prony法辨识出含粘滑摩...
金属材料干摩擦特性仿真方法与试验验证(Simulation Study on the Dry Friction Characteristics of Metallic Materials Based on Test)
金属材料 干摩擦 仿真
2009/8/11
通过设计的金属干摩擦特性试验装置,测量得到了金属材料试件在固定正压力下的干摩擦迟滞特性,并且在MSC/MARC中建立了与试验相一致的有限元模型来仿真预测干摩擦接触的粘-滑迟滞特性。通过与试验数据的比较,验证了仿真模型的正确性,发现有限元模型结果与试验结果以及理论计算结果吻合程度较好,从而有助于分析工程实际中材料干摩擦特性和阻尼特性,验证了有限元方法的可行性。
Development of a Mathematical Model Using Dimensional Analysis for Predicting the Friction Losses in Drip Irrigation Laterals with Cylindrical Type In-Line Emitters
Drip irrigation emitters friction loss mathematical model dimensional analysis
2009/1/13
This paper presents a prediction model developed using dimensional analysis for friction losses in drip irrigation laterals. Drip irrigation laterals with cylindrical type in-line emitters placed at d...
Static and kinetic friction of rapeseed
rapeseed static friction kinetic friction galvanized steel stainless steel concrete B 30
2014/2/27
he present paper examines the static and kinetic coefficient of friction of rapeseed. The project utilized two methods of determination of coefficient of friction of rapeseed: according Eurocode 1 (ki...