相对误差

基于相对误差平方和的BP算法

The BP Algorithm Based on the Square Sum of the Relative Error

用计算机绘制不同x的相对误差函数图。

The relative error function diagram of different x in ERDS has been drawn by a computer .

一种具有较小相对误差的无条件稳定FDTD算法

An Unconditionally-Stable FDTD method with Low Relative Error

残差GM（1,1）模型平均相对误差为4.73%，模型精度为优。

Average relative error of ameliorated grey model ( 1,1 ) was 4.73 % , model accuracy was good .

最后分析了拟合计算结果与Euler公式计算临界载荷的相对误差。

At last , the relative error between the imitation algorithm and Euler formula has been analyzed .

结果：预测值与实测值的平均绝对误差E为0.532，平均相对误差为1.059%。

Results : Factual value and predicting value and average and absolute error margin E is 0.532 , the average and opposite error margin is 1.059 % .

最后以两个实例运行了这个VI程序，各测量数据相对误差不大于0.17%。

Final , two actual examples run this VI program , greatest relative error of measurement numbers is 0.17 % .

分别采用二维CFD计算和试验结果对该模型进行了校验，其相对误差小于10%。

The model was checked by using 2D CFD calculation and test results , and the relative error is less than 10 % .

本文介绍了一种应用单片机技术测量电机转速的新方法，具有测速范围宽（25～25000rev／min）和测量精度高（相对误差＜10（-5））等特点。

The paper introduces a new method of measuring rotational speed on electromotor with singlechip microcomputer , characterized as wide-range & high precision of rotational speed measuring .

通过神经网络模拟与传统有限元模拟结果，并结合凝固温度场的实测结果，对比分析了四川大学硕士学位论文神经网络与有限元模拟的与实测结果的相对误差与CPU时间开销。

Resulted from neuro-optimization and FEM respectively , relative error and CPU time in simulation of temperature field of casting are discussed , combined with experimental data .

基本参数法与理论影响系数法分析结果与确认值一致，对Cr，Ni分析的相对误差<10%。

Results of theoretical influence coefficient method and fundamental parameter method are consistent with certified values ; the relative error is smaller than 1 % to Cr and Ni .

对于计算机系统运行的某一时段，用前K次审计时事件发生次数的均值作为第K+1次的期望值，然后求期望值和第K+1次的实际次数的相对误差。

In some period of time of a running computer system , mean value of an event 's frequency in k audits is taken as expected value at k + 1th audit .

对海河流域蒸散发进行了流域尺度的验证，水量平衡计算蒸散发与相应年份的1km分辨率遥感反演ET进行比较，两者的相对误差在18%以内。

Comparison between ET of Water balance and remote sensing , their errors is within 18 % .

结果表明：温度残差的平均绝对误差（MAE）是Spline平均相对误差（RME）分别为：9.56%和9.66%。

The results of mean absolute errors were ranked as Spline relative mean errors ( RME ) averaged 9.56 % .

给出一种多传感器分布式次优Kalman滤波器，并以相对误差协方差矩阵作为量化指标，对该滤波器的融合效果进行评估；

A sub-optimal Kalman filter is presented in chapter 3 , and the relative error covariance matrix ( RECM ) is introduced to evaluate the performance of the fusion process ;

利用在美国加利福尼亚州ImperialIrrigationDistrict灌渠试验得到的数据验证了最大相对误差和随机不确定度预测模型的有效性。

The validity of this model and the model of predicting random uncertainty are verified by field test data for the measurement of an irrigation canal in Imperial Irrigation District in California , USA.

苯甲酸的平均RSD为0.41%，平均加标回收率是100.7%，相对误差值是-0.37%。

The relative standard deviation of benzoic acid was 0.41 % , average recovery was 100.7 % , average relative error was-0.37 % .

轧制压力的BP网络预报值相对误差小于3%，轧制力矩的BP网络预报值相对误差小于4%。

The relative error of BP network predicted value for rolling force was less than 3 % , and the relative error of BP network predicted value for rolling torque was less than 4 % .

对某油田B单元8口井共49个测压点应用不停抽压力计算方法，计算结果相关性较好，平均相对误差仅1.67%。

The non-stop pumping pressure computation method was applied to 49 pressure measuring points in 8 wells of B block in a certain oilfield , the results show a nice correlativity with only 1 . 67 % of average relative error .

Hwang实验的实测摩阻损失相差不大，相对误差小于16%，具有一定的应用价值。

Hwang and the model gives the relative error of less than 16 % and offers more practical value .

合成半球图像的实验结果表明，与三角形面元算法相比，新算法恢复高度的平均相对误差和CPU运行时间分别减少了37.2%和20.22%。

The experimental results of the synthesized hemisphere image show that the relative height error and CPU time of the proposed SFS are dropped by 37.2 % and 20.22 % respectively compared with the triangular-facet-based algorithm .

能级累计数N（E）的计算结果也有较大改进，其平均相对误差为40.56%，仅比在D计算值的平均相对误差高14.3%。

For the cumulative numbers of levels N ( E ), the calculated average relative error is no more than 40 . 56 % for 268 nuclei , higher than the average relative error of D-cal by about 14 . 3 % .

结果表明，改良ANNBP算法预测相对误差在5.6%以内，且有较好的容错能力，比较好的解决了炭黑生产过程中的预测模型构建问题。

The results indicate that the relative prediction error based on meliorated ANN-BP arithmetic is under 5.6 % , the model with preferable accommodation error is suited to solve the problem of setting up prediction model of carbon-black production .

提出改进的预报相对误差法选择岭回归参数k，以平均预报相对误差替代预报残差平方和，并抑制过拟合。

A new criterion for k-value selection , the key problem existed in ridge regression , was proposed based on the combination of the average predictive relative error with average self-checking relative error instead of the sum of predictive residual squared error .

运用有限差分法并通过MATLAB编程对两半导体球壳内的电位进行了数值计算，与解析解结果比较，其相对误差很小。

The paper uses finite difference calculus to do numerical calculation on electric potential in two-half-conductor spheric shell by compiling computer program of MATLAB language . Comparing with the results of analytical solution , the relative errors between them are very little .

随着蒸馏温度的增加，FFA分离时的蒸馏量增大，模拟值与实验值的相对误差不超过16%，同时重组分中FFA含量不断降低，模拟值与实际值随蒸馏温度的变化趋势相近。

Degree of evaporation increased with the increase of evaporator temperature when FFA separation took place . The relative error between model and experimental value was below 16 % .

该方法测算结果与化学分析方法所得结果的相对误差，Vo2为2.33%～3.82%；

Compared with chemical analysis method , the relative error of Vo2 and Vco2 were 2.33 % - 3.82 % and 0.66 % - 1.82 % respectively .

与蒸汽压渗长期透法（VPO）相比，测定分子量数据的相对误差小于10%。

The relative errors of the molecular weights determined by cryoscopy are less than 10 % as compared with those determined by VPO method .

野外锶矿X荧光测井试验表明：X荧光测井确定的锶矿层厚度和平均品位传统的岩芯化学分析结果相比较，基相对误差＜10%，符合锶矿储量计算要求；

A test on strontium deposit showed that relative errors between thicknesses and average ore grades of the strontium seams determined by X-ray fluorescence logging and by traditional core-chemical analysis are less than 10 % , which can meet the requirments of reserve calculation standard .

Biswas估算模式的预测效果较差，预测值的相对误差在-11.87%~7.95%。

The forecasting precision of Biswas model was worse , and the relative error of forecasting results was from-11.87 % to 7.95 % .