查询词典 error condition

Based on the analysis of the mechanism of robot manipulators, a trajectory tracking controlling research model is first built up with ADAMS, and its mathematical model is formulated through the study of robot kinematics and dynamics. After the modeling errors are analyzed in practical robotic systems, a conception of centralized error is brought forward according to the theory of weighting functions. In the case of modeling errors' exist, the robotic uncertain model is derived by introducing an auxiliary control variable into inverse dynamic analysis. The control strategy of robust exponential convergence is applied to the robotic uncertain model, the applicable conditions and the applicable controller with this application are presented. The stable control effect under three main model uncertainties (parametric errors, joint disturbs, joint frictions) are systematically studied on the previously built research model. The problems of robust exponential convergence controller which often results in unstable output and so produces a large relative error when the input trajectory is in a small range are resolved by adjusting the control parameters based on the controller's structure.

本文在机械手的机械结构分析基础上，利用ADAMS建立了用于机械手轨线跟踪控制研究的机械手模型；通过对机器人运动学和动力学问题的研究，建立了机械手研究的数学模型；分析了机器人系统中模型误差的主要来源，根据加权函数法分析，提出了模型集中误差的概念；在存有模型误差的情况下，采用逆动力学结构并引入辅助控制量，由机器人误差模型推导了机器人非确定性模型；提出了采用鲁棒指数收敛法对上述机器人非确定性模型进行鲁棒镇定的控制策略，并给出了对机器人进行鲁棒指数收敛控制时系统不确定因素应满足的匹配条件；针对机械手研究模型，深入研究了鲁棒指数收敛控制器对机器人系统中常见的模型参数误差、关节扰动、关节摩擦等不确定因素的镇定控制效果；针对鲁棒指数收敛控制器易产生控制量振荡的问题以及在小范围内系统轨线跟踪的稳态误差过大问题，本文分别提出了基于控制器结构的控制参数调整法和基于轨线跟踪范围大小的控制参数分段切换法。

The error performance of the proposed communication scheme is analyzed and the average probability of error decision is obtained.

分析了该方案的误码性能，得到了平均误码率的估算公式，分析得到了可降低误码率的信号设计基本规则。

Practical results show that the proposed method lowers both average error and maximum error and improves forecasting precision.

对预测结果的分析表明，多点外推法不仅减少了平均误差，也使最大误差降低，能有效提高预测精度。

Minimax estimator;Bayes solution;Poisson mean;Restricted space;K-normalized squared error loss;Linear minimax estimator;Weighted squared error loss

中文关键字大中取小估计式；贝氏解；卜阿松分布平均数；限制参数空间；K-正规化平方误差损失；线性大中取小估计式；加权平方误差损失

Our success is made doubtful by that besetting error of ours, the error of trying to do too much by vote.

我们的成就已经被我们那种令人烦恼的错误弄成值得怀疑的东西了，这错误就是试图通过投票作过多的事情。

In the fifth chapter, we propose the conditional generalized ridge-type estimator of regression coefficient in restricted linear regression model, and prove that it is superior to the restricted best linear unbiased estimator in terms of mean squares error and mean squares error matrix, we also give the choice of parameters matrix K.

第五章给出了约束线性回归模型中回归系数的条件广义岭估计，讨论了它的优良性，证明了它在均方误差及均方误差矩阵下都优于约束最小二乘估计，并给出了参数矩阵K的选择。

To assure parts' machining precision and to improve productivity, touch probe is used to inspect cylinder of parts on machining centers, thus coordinate of points on features are acquired from numerical control system by a data collecting program, and cylindricity error is calculated by computer. This method has broken the restriction of probe's macro processor that couldn't work out cylindricity error. Data saved in computer are beyond the limited memory of numerical control system, which improves operation speed.

为了保证零件加工精度和提高生产率，在数控加工中心中采用触发式零件检测测头对被加工件的圆柱面进行在机检测，并利用数据读取程序从数控系统内部提取被检测点坐标信息，在计算机内部完成圆柱度误差的计算，克服了零件检测测头自带宏程序无法对圆柱等被测特征进行误差运算的局限性；并且检测数据存储于计算机内，不再受数控系统内存小及运算速度慢的限制。

Matching and bit reversal based on prediction arithmetic utilizes the relativity between continuous two frames/slices. It locates error position by setting a number of featured syntax fields and predicted values. The most perfect result is that the arithmetic can correct n+1 bits error by n featured syntax fields.

基于预测的匹配翻转算法充分利用时域上前后传输单位之间头部字段的相关性，通过设置特征字段以及其预测值来确定出错范围，进行纠错，理想情况下设置n个特征字段最高可以纠正n+1个比特错误。

It mainly includes the following aspects: It summaries the characteristics of various kinds of calculatingmethods systematically, such as diameter error method, roundness errorand cylindricity error and establishes geometric parameter measurementpattern of the borings, which is fit for the computer on-line automaticprocessing.

针对测量机研制的需要，论文研究了缸孔几何参数的在线测量方法和数学模型、专用传感器设计、测量的信号处理、测量精度的实现以及测量系统的设计等理论与关键技术问题。

By taking advantage of the modeling capacity of neural networks, the dependence on model of inverse system is reduced. Neural networks error model is used to estimate the uncertainty to decrease the error bound set in variable structure control.

围绕这两个目的，本文首先介绍了挠性结构发展的现状，以及所面临的主要控制问题和采用的主要控制方法，分析了各自的优势和存在的不足。

For the head-teacher of the class said that I had seriously broken the school rules,which led me to a three-day suspend class.

为什么呢？因为我的班主任说我严重的违反了校规，于是让我停课三天。

Many of them believe that the conversion of thousands of working-class folk in England spared that nation from the mass carnage and the tyranny that came with the revolution in France.

他们之中有许多人相信，在英国数以千计的劳工阶级之悔改信主使英国免於遭受如法国大革命所造成的大屠杀和专制暴政。