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Application of diff erential geometry in agricultural vehicle dynamics
trajectory modelling numerical integration radius of curvature
2014/2/24
h is paper deals with the application of diff erential geometry methods to a precise calculation of the length of trajectory of an agricultural mechanism that moves on a sloping terrain. We obta...
Cropping Systems Dynamics in the Lower Gangetic Plains of India using Geospatial Technologies
Cropping pattern crop rotation Cropping system West Bengal Performance indices
2014/5/6
Cropping system study is useful to understand the overall sustainability of agricultural system. Capturing the change dynamics of cropping systems, especially spatial and temporal aspects, is of utmos...
3-PRR柔性并联机构动力学分析(Dynamics Analysis of 3-PRR Compliant Parallel Mechanism)
柔性并联机构 自由振动 动力学分析 拉格朗日方程
2010/12/29
提出一种可应用于微/纳操作领域的3-PRR柔性并联机构,基于Euler-Bernoulli梁理论,采用假设模态法,分析支链上从动杆的柔性,结合实例说明了将从动杆视为刚性杆处理的依据。为进一步分析各构件惯量参数和柔性构件刚度对系统固有频率的影响,采用拉格朗日方程建立了修正的机构动力学振动微分方程,并结合实例进行分析,利用仿真计算验证了所建模型的有效性。
基于高性能计算的曲轴系统动力学与疲劳仿真(HPC-based Dynamics and Fatigue Simulation on Crankshaft System)
曲轴 动力学 有限元 疲劳寿命 高性能计算
2010/12/29
针对曲轴的动力学仿真和疲劳寿命计算,建立了一种曲轴系统大规模直接计算模型,借助高性能计算(HPC)技术并利用显式有限元算法实现了动力学模型的直接求解,结果详细描述了包括曲轴强度和变形在内的曲轴系统动力学特性。采用全寿命分析方法直接对动力学仿真结果进行曲轴寿命及安全系数的计算,基于应力-时间历程等动态结果进行的疲劳分析结果显得更为真实。计算过程和结果证明了曲轴系统直接动力学及疲劳仿真分析方法的可行性...
纳米铜晶胞体积弹性模量变化规律的分子动力学模拟(Molecular Dynamics Simulation for Variation Relationship of Volume-elasticity Modulus of Crystal Cu with Pressure and Temperature)
分子动力学 纳米铜晶胞 体积弹性模量
2009/12/28
用分子动力学的方法详细模拟纳米铜晶胞随温度与压强变化的规律,得到了铜晶胞体积弹性模量突变的敏感压强点。模拟结果表明:单晶铜的在压强小于75 GPa时体积弹性模量随温度升高而降低,随压强增大而增大;在压强大于75 GPa时,体积弹性模量随温度升高而增大,随压强增大而减小。