搜索结果: 1-15 共查到“friction”相关记录16条 . 查询时间(0.066 秒)
Embedded strong discontinuity finite elements for fractured geomaterials with variable friction
bifurcation rate- and state-friction strong discontinuity enhanced strain finite element
2015/7/1
The strong discontinuity approach to modelling strain localization, combined with an enhanced strain element, has been used for more than a decade to model strain localization in materials including g...
The present paper - a continuation of our recent series of papers on Casimir friction for a pair of particles at low relative particle velocity - extends the analysis so as to include dense media. The...
Theoretical And Experimental Analys Of Plastic Deformation Heat For Pim-Ring Sliding System Under Dry Friction Conditions
Sliding Friction Plastic Deformation Frictional Heat
2009/10/15
In this study, a theoretical model which can ensure the calculation of plastic deformation heat occured at the worn surfaces due to the friction during sliding was established and the validity of the ...
The Variation of the Friction Coefficient in Pipe Connections Working Under Static and Dynamic Loads
Galling Time Dependent Friction Coefficient Lubrication
2009/10/14
The friction coecient and the galling process in metal to metal parts depend on many variables such as normal load, lubricant, roughness and design of the friction surfaces. Since developing a mathem...
Investigation of the Friction Coefficient in Smooth Open Channel Flows
Open channel energy loss friction factor
2009/10/14
In practical engineering, the friction coecient formulations developed for circular pipes are usually assumed to be valid for open channels and used in derivation of mathematical formulation. However...
Investigation of the Friction Behavior of the Zinc-Aluminum Based Commercial ZA-27 Journal Bearing
Zinc-aluminum alloy plain bearing friction lubrication
2009/10/13
The zinc-aluminum based ZA-27 alloy was produced by permanent mould casting. Using this alloy and bronze obtained from commercial sources, thin wall journal bearings were manufactured by machining. Th...
滚动轴承摩擦力矩的非线性特征（Nonlinear Characteristic of Rolling Element Bearing Friction Torque）
滚动轴承 摩擦力矩 时间序列
2009/5/22
以混沌理论为基础，通过试验研究滚动轴承摩擦力矩时间序列的非线性特征评估问题，为精确计算滚动轴承摩擦力矩的动态性能奠定基础。用关联维数标准差刻画摩擦力矩的不确定性，用关联维数均值描述摩擦力矩非线性特征的演变历程。研究表明，滚动轴承属于确定的非线性动力学系统，但其摩擦力矩呈现出明显的不确定性。随着转速的增加，滚动轴承摩擦力矩关联维数标准差与均值都呈现出非线性增大的趋势。
考虑摩擦和参数不确定的平面五杆机构控制（Nonlinear Friction Compensation of Planar 5-bar Parallel Mechanism with Time Variable Parameters Using Sliding Mode Control）
平面并联机构 关节摩擦 滑模变结构控制
2009/5/22
建立了机构运动副摩擦的数学模型，将关节接触面间的作用力转换为理想约束力与摩擦力矩。将摩擦力矩视为外加非保守力，应用简化模型法建立了包含关节非线性摩擦的平面并联五杆机构的动力学模型。基于滑模变结构理论设计了该模型考虑参数不确定性的鲁棒轨迹跟踪控制器，并证明了其稳定性。实验和检测结果表明所建动力学模型正确，所设计的控制器对机构中的非线性摩擦力有较好的补偿效果并具有较强的鲁棒性。
Effect of surface roughness on friction in cold forging
Tip test Friction measurement Surface roughness
2010/1/19
Purpose: Tip test has been developed to characterize the friction during cold forging process based on a linear
relationship between the maximum load and radial tip distance measured. In this previou...
FATIGUE BEHAVIOR OF ALUMINUM DECK FABRICATED BY FRICTION STIR WELDING
aluminum alloy deck friction stir welding extrusion fatigue
2008/12/30
An aluminum deck was fabricated by joining hollow extrusions with the friction stir welding (FSW). The purpose of this study is to make clear the fatigue behavior of the deck. First the material prop...
Mechanical properties of friction stir butt-welded Al-5086 H32 plate
Friction stir welding Al-alloys Joint performance
2010/2/4
Findings: The experimental results indicated that the maximum tensile strength of the joints, which is about 75% that of the base plate, was obtained with a traverse speed of 200 mm/min at the tool ro...
Prediction of Friction Stir Welding Characteristic Using Neural Network
Friction stir welding Mechanical properties ANN
2010/1/15
An artificial neural network (ANN) model was developed for the analysis and simulation of the correlation between the
friction stir welding (FSW) parameters of aluminum (Al) plates and mechanical pro...
Friction welding of dissimilar metal joints with intermediate layers
Metallic alloys Friction welding
2010/2/22
Purpose: Metals such as titanium, vanadium, zirconium, niobium, molybdenum and also tantalum and tungsten must be protected at elevated temperatures from the effects of oxygen, nitrogen and hydrogen. ...
NON-CONVENTIONAL METHOD FOR FRICTION COMPENSATION IN DC DRIVE POSITION TRACKING
friction non-model-based friction compensation stiction Stribeck effect
2010/1/12
Friction, especially its nonlinear components, may degrade the tracking
performance of any servo drive systems. Focused on high precision positioning of DC
electrical drive the paper proposes an eas...
Experimental Studies of a Series of High Strength Friction Grip Bolted Joints
Experimental Studies High Strength Friction Grip Bolted Joints
2010/8/18
The performed tests intended to establish the necessary conditions for surfaces of the assemblage elements in contact with the KB, so as, by connecting them using the HSFG (High Strength Friction Grip...