误差因素

This paper discussed working principle of the ideal electronic integrator which was constituted of operational amplifier. Integral drift parameter and integral time constant as main factors influencing the accuracy of integral output were analyzed.

摘 要：讨论了由运算放大器构成的理想电子积分器的工作原理，分析了积分漂移、积分时间常数等主要因素对积分输出误差的影响及改善措施。

Chapter 3 analyzes numerically the effects for orbit calculation caused by orbital perturbation, parameter error and so on. A precise mathematical model of orbit calculation is given.

第三章通过数值法分析了各项轨道摄动和参数误差等因素的对轨道计算的影响，给出了精确的月球探测器轨道计算数学模型。

Phase angle error in the system was the main concern to reduce measurement error.

相角误差是影响此系统测量精度的重要因素。

To solve this problem, according to the analysis of the quality factors of the X-ray, the measurement for X-ray tube voltage/current is presented based on Q-factor and its derived QL and QH-factor when X-ray tube energy bandwidth is defined.

针对传统的管电压/管电流测量方法虽然可以检测出X射线管电压/管电流误差值，但不能反映其质量特征的状况，在分析影响X射线质量高低的因素的基础上，引入了射线管能量带宽的含义，并由此提出了基于Q值及其派生QL值、QH值的射线管电压/管电流分析方法。

Randomized orthogonal table is used to produce the specimens for radical basis function neural network.Self-organizing feature map is used to classify the specimens.

选取模具参数和工艺参数等作为影响冲压成形结果的因素，用正交表和随机法产生径向基函数神经网络的学习样本；利用自组织神经网络对样本进行分类，用有限元网格法反算的毛坯的长度作为神经网络的输出；设计了神经网络流程，定义了神经网络输出与有限元分析数据的相对误差。

Based on complex transfer matrix method,a model to calculate unbalance response of a residual bending rotor is set up.Response of different residual bend mode is analyzed.

0前言转子由于加工误差以及热变形等众多因素的影响，经常会产生一定的弯曲量，引起转子振动。

The following conclusions have been reached, milk has an obvious absorption in the mid-infrared band, and the locations of the absorption peak are consistent with the attributes of molecule functional group analysis and the information from FOSS Company; the effects of the factors on the repeatability are below 3‰; For the quantitative analysis, the method of factorial design is applied to optimize the calibration set. The outliers are determined considering the residual variance distribution. The correlations are 0.990 and 0.986 for fat and protein, respectively. The Root Mean of Square Error of Prediction is 0.121 and 0.111 for fat and protein, respectively. With the application of the methods of wavelengths selection, the numbers of wavelength is decreased greatly from 3301 to 100. The speed is accelerated and the accuracy of the calibration is improved to some extent.

结果表明：牛奶在中红外的吸收特性明显，吸收峰的位置与分子结构的谱带归属以及乳品分析仪器的成功厂商FOSS公司提供的资料基本一致；各种因素对光谱测量影响的CV值基本可以控制在3‰以下；在定量检测中，通过析因设计方法优选校正集样品，结合样品的残差图确定奇异点，脂肪模型和蛋白模型的相关系数分别为0.990和0.986，预测均方根误差分别为0.121和0.111，而在采用波长选择对模型进行优化后，波长从3301个减为100个以内，加快了运算的速度，同时还在一定程度上提高了模型的精度。

Under salinity stress condition, the root distribution of winter wheat would have greatly changed with environmental factors. Routine methods of simulating root distribution would bring more errors.

盐分存在条件下根系在土壤剖面中的分布会随众多的因素产生变化，由常规的拟合方法得到的根系分布与实际值会存在较大的误差。

Through calculation and comparison, Data can also understand that the accuracy of rounding error and a series of other relevant factors.

并且通过计算比较，也可以了解到数据的精度及舍入误差等一系列有关因素。

ABSTRACT:The half-power bandwidth method is the commonly used method at home and abroad, the authors discover that factors, such as the sampling frequency, the frequency resolution, the ratio of the sampling frequency to the signal frequency, the analyzed width and the damping ratio, make the estimated damping ratio fluctuate vastly. Mostly the result is incredible except for some conditions, the error is sometime amazing, which is not acceptable.

半功率带宽法是国内外常用的测试阻尼的方法，笔者发现半功率带宽法由于受到信号处理中的①采样频率SF②频率分辨率△f③采样频率与信号频率之比K ④采样分析的长度T和⑤阻尼比D的大小等因素的影响使得测得的阻尼比值波动很大，除少数状态是可信的外，多数状态是不稳定的，有时误差惊人，得到的测试数据不能使用，易导致错误的结论。

It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.

从鲍尔点的形成原理出发，分析对称连杆曲线上鲍尔点的产生条件，提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。

The factory affiliated to the Group primarily manufactures multiple-purpose pincers, baking kits, knives, scissors, kitchenware, gardening tools and beauty care kits as well as other hardware tools, the annual production value of which reaches US$ 30 million dollars.

集团所属工厂主要生产多用钳、烤具、刀具、剪刀、厨具、花园工具、美容套等五金产品，年生产总值3000万美元，产品价廉物美、选料上乘、质量保证，深受国内外客户的青睐