精度

On the basis of FBEM, another method can be gained when the fictitious stress in FBEM is replaced by fictitious concentrated force. This method is called fictitious point force method.

由于应力奇异性的存在和边界条件的近似，边界上及其附近域的数值解的精度较低，难以满足实际问题对精度的要求。

College of Guandong Business, Guanzhou 510320, China）Abstract: Since large-scale vertical quench furnace is voluminous, whose working condition is a typically complex process with distributed parameter, nonlinear, multi-inputs/multi-outputs, close coupled variables, etc, dynamically decoupling control algorithm of temperature distributed parameter system in the furnace was presented, by which the whole system was decoupled to several subsystems and the implementation of controller was simplified. With finite difference approximation, the space and time step size was solved to ensure the convergency of finite difference approximation. After decoupling, the subsystems were controlled with self-learning PID control algorithm. The results show that the temperature control precision and homogeneity are improved; the overshoot and process in temperature rising period are reduced simultaneity.

摘 要：针对大型立式淬火炉体积庞大，工况复杂，炉内温度分布呈本征非均匀性，具有多输入/多输出、非线性、强耦合等特性，难以实现炉内温度高精度高均匀性控制目标等问题，提出一种温度分布参数系统动态解耦控制算法，其原理是：采用有限维逼近方法将对象解耦为多个独立的子系统，简化控制器的实现过程；通过分析有限维逼近方法的收敛性，获得保证收敛性的空间和时间步长应满足的条件；解耦后的子系统采用自学习PID控制算法，实现炉内温度高精度和高均匀性控制以及升温过程的快速性和小超调。

Generally speaking, to guarantee the accuracy of the flat surface process is easier than that of the bore.

一般来说，保证平面的加工精度要比保证孔的加工精度容易。

Generally speaking to guarantee the accuracy of the flat surface process is easier than that of the bore.

一般来说，保证平面的加工精度要比保证孔的加工精度轻易。

The amount of data to be stored and the calculation load to rebuild the flight path is reduced considerably.

仿真表明航迹重建算法的精度与一般导航计算的精度是相当的。

As shown,the accuracy of float and glass tube is of great significance,especially in low flowrate measurement.

分析表明浮子的最大截面尺寸和玻璃管尺寸的精度对流量测量，尤其是小流量时的测量精度影响最大。

Experimental results and values in theory were accordant well. Experimental results showed that the radius of focal spot would increase with the longer focal length, and focal depth would decrease with higher order of FZPs.

实验还发现，聚焦的焦斑半径会随着焦距的长度而增大，而聚焦深度则随着分形波带片的阶次的升高而减小，同时还对比了分形波带片和常规波带片的焦距调节方式和精度，理论研究表明分形波带片的调节焦距的方式具有更高的调节精度。

By analyzing the compute results of the integral-exponent-function and the fractional exponent function, conclusion is obtained that the second will improve the precise for its superiority in avoiding "Romberg" phenomenon.

通过对比分析整数次幂和非整数次幂拟合的计算精度，得出了非整数次幂逼近拟合能消除龙格现象，使用非整数次幂进行拟合可使精度提高的结论。

The statistical distribution of the fractional part of the multiplication of arbitrary coefficients, where the first item is integer, and its correspond n independent random variables.

具体来讲，计算费用低要求有快速的随机变量抽样算法，精度高要求随机数发生器的品质要好，随机变量抽样的精度高，仿真输出估计量的方差要小。

The accurate center location of fringe pattern is vital to measurement accuracy of interferometric method.

干涉条纹中心的定位精度对于干涉法的测量精度至关重要。

This one mode pays close attention to network credence foundation of the businessman very much.

这一模式非常关注商人的网络信用基础。

Cell morphology of bacterial ghost of Pasteurella multocida was observed by scanning electron microscopy and inactivation ratio was estimated by CFU analysi.

扫描电镜观察多杀性巴氏杆菌细菌幽灵和菌落形成单位评价遗传灭活率。