误差曲线

The results are the following: When calculating the motion mass, it is better to use idler's equivalent mass instead of the rotating part mass and serial idler's rotating inertias and equivalent mass are calculated. The accurate analysis result for the deflection curve length of the belt shows: The error calculated by the approximate parabola length is lower than 10〓. Thus the approximate method is accurate enough for calculation. The relations between the running resistances coefficient and the belt velocity are studied by experiment, which are the bases for calculating the linear coefficient values between them.

得出：在计算参与运动质量时对托辊应采用托辊的等效质量而不是目前采用的托辊旋转部分质量，并计算出了系列的托辊转动惯量和等效质量；对输送带的挠曲线长度进行了精确的分析，结果表明：采用近似的抛物线长度计算方法其误差在10〓以下，因而得到在计算输送带挠曲线长度时采用近似的抛物线具有足够的精度；对输送机运行阻力系数与带速间的关系进行的实验研究，得出阻力系数与带速线性关糸的系数值。

To the question of fatigue invalidating of strain gages in dynamic test(normally the zero drift value being bigger than the permissible value),the equations for calculating the fatigue life of the strain gages are derived on the basis of the fracture mechanics theory.

针对应变片在长时间的动态测试中疲劳失效(一般是测量误差超过允许值)问题，本文从疲劳断裂力学的基本理论出发，导出了应变片疲劳寿命的计算公式；实验表明，实验曲线与理论曲线吻合，这证明我们推导的公式的正确性，为应变片的疲劳寿命的预测、许可载荷的确定、失效判据的确立提供了理论基础。

Properness of a parameterization is a basic property of rational parametric curves and it has been well studied when the coefficients of the parameterization are rational. However, such coefficients in engineering and CAGD are often represented with float numbers with errors.

有理参数曲线的恰当性是曲线的基本性质，虽然其在有理系数情况下已经有完备的结果，但在工程和CAGD应用中常常得到带误差浮点系数的有理表示形式。

Firstly, a quintic PH-spline curve is used to approximate a cubic Bézier curve within a bound. The convergence for the approximation is proved.

研究用C1连续的五次Pythagorean-Hodograph样条曲线逼近一给定的三次Bézier曲线，证明了这种逼近算法在常用误差测度下的收敛性。

Adopt software of Surfacer to fit curve and remodel surface, go on analysis of error and continuity, make model surface achieve rang of smooth and precision.

利用Surfacer软件对点云进行曲线拟合以及曲面重构拟合，通过对拟合曲线和自由曲面的误差分析以及连续性的分析，使构造的自由曲面光顺度和精度均满足要求，从而实现理论与实际的相结合。

A modified analysis method based on the determination of ozone—indigo disulphonate spectrophotometer(GB/T 15437-1995) in gas phase has been developed to detect the concentration of ozone in liquid phase. An analytical condition of λmax=612～615 nm,ε=20 000 L/, pH 2 is obtained by the titration of indigo disulphonate. Compared with potassium iodide method,it shows a higher precision and accuracy,CV＜3.0%. The results also prove that blank experiment will bring about 5.0%systematic error.

在气相臭氧浓度的靛蓝二磺酸钠分光光度法(GB/T15437-1995)基础上提出了液相臭氧浓度的测定方法，采用靛蓝二磺酸钠标准曲线法代替采用易分解的臭氧标准曲线法，得出测定条件λmax=612～615 nm、ε=20 000 L/、pH为2，通过碘量法比较实验，说明新的测定方法具有较高的精度和准确度，相对标准偏差小于3.0%；比较结果表明忽略空白实验将引入5.0%的系统误差。

Arc plume emis— sion spectrum which fits the Planck blackbody radiation function by assuming T=4 350 K shows Swan band system of C2.The arc plasma temperature is about 4 300~4 400K,and the error is about 100K.

放电过程中的电弧等离子体光谱测试表明其中主要有C2分子的发射峰，光谱分布曲线与普朗克黑体辐射曲线中T=4 350 K的分布情况吻合，确定放电电弧等离子体温度约4 300~4 400k，测量误差约100 K。

The varies regression curves have been adapted to calculate moisture in order to increase device precision and overcome the shortcoming of big error at high moisture when using single curve. 3 Varies scope output signal are changed to 4～20 mA and sent to computer over the share-voltage compensation circuit. The multi channel sensor could be auto chosen to display lumber moisture in different position of the kiln. It makes the moisture distribution of lumber in the kiln clearly and drying standard accurately.

所以采用不同的拟合曲线对水分进行换算，以便提高仪器精度，并克服单一曲线造成的高含水率时误差较大的缺点；3：采用分压补偿式测量电路，将不同量程的输出信号转换成统一的4～20mA信号，送至计算机进行集中数据处理；并自动控制多路传感器的选择，分时显示干燥窑中不同部位木材的水分，使整个窑中木材水分分布一目了然，便于准确地制定干燥基准。

In order to reduce geometric errors between motion trajectory and work piece curve,this paper present a means of controlling trajectory motion law to replace traditional position control.

为了减小刀具运动轨迹与工件几何曲线的误差，提出将传统的位置控制改为物理运动规律控制，即建立数控机床的运动模型，分析被加工轮廓的曲线方程、加工工艺运动要求与刀具加工运动的合成或分解关系，推导出轨迹运动方程组。

First, we introduce the principle of feeder protective apparatus and select adequate protective equipments in accordance with different types of distribution system, using the least square error method to simulate the time/current curve and applicate simulation formula to digital the curve data, Secondary, using augmented incidence matrix method to find the exact pairs of primary/backup protection relay and find the relay tripping sequence of distribution lines.

首先介绍线路之过电流保护设备动作原理，依不同之配电系统型态来选用适当之保护设备种类，并使用最小平方误差法模拟保护电驿之时间－电流特性曲线，应用模拟方程式将曲线之资料数位化，且藉由图形理论中之增广关联矩阵法求取正确之主保护与后卫保护电驿对，以找出系统中各配电线路保护电驿间之跳脱顺序关系。

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