Discussed the screw theory and the product of exponentials (POE) formula used to solve the manipulator inverse kinematics problems.
讨论了用旋量和指数积公式计算PUMA类型6自由度机器人运动学逆解的方法。
For inverse singularity,the parallel robot is divided into several series mechanisms,and the Jacobins matrix of these series mechanisms is solved by the exponential product equation and proved to be .
对于逆奇异,将并联机构拆分成多个串联机构,由指数积方法求得其雅可比矩阵,并证明了机构逆奇异产生时的雅可比矩阵为奇异。
In the paper, the exponential product formula based on screw theory is used, by which the kinematics formula and Jaco-bian matrix of serial open-chain manipulators made up of excavator s swing, boom, arm and bucket are developed, and the validity of the method is confirmed.
本文运用了基于旋量理论的指数积方法,推导出挖掘机回转装置、动臂、斗杆、铲斗多杆件组成的串联开链机构的运动学方程,求解雅可比矩阵,并验证该方法的有效性。
Based on screw theory and exponential product method,the inverse kinematics of the passive and active joints of the 6-PRRS parallel robot was resolved.
利用旋量理论和指数积方法求解了6-PRRS并联机构主动关节与被动关节的位置逆解。
Therefore, the observed rainfall and the relevant flood data of some rivers in Haihe River basin are analyzed, with which the area index scales of the flood volumes in different periods are obtained, which provide the project design with a reasonable basis.
为此,对海河流域部分河流实测降雨洪水资料做了分析,得出了不同时段洪量的面积指数范围,为南水北调中线工程设计提供了依据。
Evidence suggests that on the basis of deviations in heights from zonal mean three area indexes are calculated for the Urals, Lake Baikal and Ehuocik areas, respectively,which can well express the daily evolution in intensity and position for the 1998 summer Eurasian blocking highs and bear close relationship wit.
结果发现 ,利用纬偏值作为基本量可以计算出乌拉尔山地区 ( 2 5～ 80°E)、贝加尔湖地区 ( 80～ 1 2 5°E)、鄂霍茨克海地区 ( 1 2 5～1 70°E) 3个区域阻塞高压的面积指数 ,该特征值能很好地揭示 1 998年夏季阻塞高压强度和位置变化的逐日演变特征 ,并且与我国 1 998年夏季降水的分布有重要的联系。
The results could be match the index data of the typhoon area index.
(2)从台风温度距平值研究发现:台风在登陆前温度距平值达到最大,登陆后逐渐减少,其趋势与台风面积指数走势情况有相似性较强。
This paper put forward conception of cumulative index,.
以深圳城市森林小群落为例,研究群落个体数与直径、高度、物种数之间的结构相关性;选用10种多样性指数,分别以丰富度、均匀度、物种多样性的综合指数值和排序,描述和比较深圳城市森林小群落多样性差异和水平;提出蓄积指数的概念和群落综合指数K以及应用于多样性比较的方法;指出多样性分析应考虑胸径结构,树高结构,并统一可比性标准。
Advance in Ground-based LAI Measurement Methods
叶面积指数地面测量方法的研究进展
Estimating Leaf Area Index by Fusing MODIS and MISR Data
联合MODIS与MISR遥感数据估算叶面积指数
Quantitative relationships between hyper-spectral vegetation indices and leaf area index of rice
高光谱植被指数与水稻叶面积指数的定量关系
Studies on the Relationship Between Yield and Leaf Area Index and Their Dry Matter Accumulation in Black Soybean
黑豆叶面积指数及干物质积累与产量的关系
A Dynamic Knowledge Model for Optimal LAI in Cotton
棉花适宜叶面积指数的动态知识模型
A Study on the Inversion and Validation of Crop Leaf Area Index Based on Remotely-sensed Data;
作物叶面积指数遥感反演与验证研究
Estimating Forest Leaf Area Index Using Hyperspectral Remote Sensing Data of Hypeion;
利用Hypeion高光谱遥感数据估测森林叶面积指数
Leaf Area Index and Specific Leaf Area of Natural Poplars in Ergis Basin
额尔齐斯河天然杨树林叶面积指数及比叶面积的研究
Researches on the Model of Leaf Area Index of Common Landscape Plants in Beijing;
北京常见园林植物叶面积指数模型研究
A Study on the Inversion and Validation of Larix Gmelinii Leaf Area Index Based on Remotely-sensed Data;
兴安落叶松叶面积指数反演与验证研究
Estimating Forest Leaf Area Index Based on BP-Nueral Networks
基于BP神经网络森林叶面积指数估算研究
Research on LAI of Several Main Garden Trees in Shanghai
上海市几种主要园林树木叶面积指数相关研究
The Relationship between Climate and Leaf Area Index Composed by MODIS Remote Sensing Data in Mountainous Area of Guizhou Province
西南山地MODIS遥感叶面积指数与气候的关系
Estimation of Regional Leaf Area Index by Remote Sensing Inversion of PROSAIL Canopy Spectral Model
PROSAIL冠层光谱模型遥感反演区域叶面积指数
Leaf Area Index Estimation for Qinghai Spruce Forest Using Digital Hemispherical Photography
青海云杉林叶面积指数半球摄影测量方法研究
Effect of Sowing Date on Yield and LAI of Supper Japonica Rice
播种期对粳型超级稻产量及叶面积指数的影响
Estimating Method of Forest Leaf Area Index on Different Space Scales
不同空间尺度森林叶面积指数的估算方法
A Study on Leaf Area and Culm-form Structure of Natural Phyllostachys pubescens in Haiziping
海子坪天然毛竹林叶面积指数及秆形结构