搜索结果: 1-15 共查到“工学 friction”相关记录54条 . 查询时间(0.156 秒)
Theorists smooth the way to modeling quantum friction
Theorists smooth the way quantum friction
2016/5/19
Theoretical chemists at Princeton University have pioneered a strategy for modeling quantum friction, or how a particle’s environment drags on it, a vexing problem in quantum mechanics since the birth...
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...
An extended finite element framework for slow-rate frictional faulting with bulk plasticity and variable friction
extended finite element friction fault plasticity
2015/7/1
We present an extended finite element (FE) approach for the simulation of slow-rate frictional faulting in geologic media incorporating bulk plasticity and variable friction. The method allows the fau...
In tuning friction to the point where it disappears,technique could boost development of nanomachines
tuning friction to the point disappears nanomachines
2015/6/18
Friction is all around us, working against the motion of tires on pavement, the scrawl of a pen across paper, and even the flow of proteins through the bloodstream. Whenever two surfaces come in conta...
Impact and Friction Sensitivity of Energetic Materials: Methodical Evaluation of Technological Safety Features
energetic materials experimental testing friction sensitivity impact sensitivity regressive analysis safety in use methodical evaluation
2015/7/28
Key methods developed and used in the USSR and in the Russian Federation to determine the impact and friction sensitivity of energetic materials and explosives have been discussed. Experimental metho...
MICROTOPOGRAPHY – THE PHOTOGRAMMETRIC DETERMINATION OF FRICTION SURFACES
Microphotogrammetry Microtopography Close Range Matching Digital Surface Model Change Detection
2015/1/6
The understanding of friction processes assumes numerous methods for analysing the features and changes of surfaces in micro- and nanoscale. One of these features is the three-dimensional characterisa...
The coefficient of friction of individual potatoes and various handling materials – Short communication
handling equipment machinery potato damage surfaces
2014/2/25
The dynamic coefficient of friction of single potatoes was determined on mild steel, rubber and plastic, for tubers in each of four conditions: dry and dirty, wet and dirty, clean and wet and clean an...
Interfacial friction damping properties in magnetorheological elastomers
Magnetorheological elastomers friction damping carbonyl iron particle particle quality and electron microscope
2015/3/30
In this study, the interfacial friction damping properties of magnetorheological elastomers (MREs) were investigated experimentally. Two kinds of carbonyl iron particles, with sizes of 1.1 μm and 9.0 ...
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...
Friction Property and Mechanism of Indoor Optical Fiber Cable and Optimization for Access Network to MDUs
Equipment techniques Fiber materials
2015/6/5
We studied the cable friction and found that it depends on polymer sheath stiffness and lubricants. Optimization should prevent stick-slip motion and reduce the friction by controlling the polymer sti...
Spatially resolved positron annihilation spectroscopy on friction stir weld induced defects
Spatially resolved positron annihilation spectroscopy friction stir weld induced defects
2010/10/12
A friction stir welded (FSW) Al alloy sample was investigated by Doppler broadening spectroscopy (DBS) of the positron annihilation line. The spatially resolved defect distribution showed that the mat...
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...
FEM applications to model friction processes in plastic strain conditions
Analysis and modelling CAD/CAM Process Systems Design FEM analysis Tribo-meter
2010/8/17
One of the basic problems in different aspects of movement is the determination of frictional resistance occurring in the analyzed friction node. Plastic working processes are also included in such ge...
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...