柔索驱动并联机器人定位误差的柔性补偿法

提出了用人工神经元网络(ANN)补偿大射电望远镜(LT)中柔索驱动并联机器人(WDPR)系统动平台位姿误差的方法.为了提高WDPR的运动精度,建立了3种可行的误差补偿方案,并运用Levenberg-Marquart(L-M)算法训练了相应的3个神经元网络.标定仿真显示,基于索长补偿的柔性标定方案比基于动平台位姿补偿的标定方案好.研究结果为提高LT舱索系统的控制精度奠定了理论基础.     

加窗插值FFT谐波分析算法的误差估计

非同步采样的情况下，快速傅里叶变换用于谐波分析存在较大的误差，很难获得准确的谐波参数。加窗插值FFT谐波分析算法能够减小谐波分析误差。针对该算法，借助计算机仿真研究了谐波分析时误差的变化规律以及最大的误差限。最后给出了谐波分析应用中的若干重要结论。     

评定直线度误差的计算机算法

评定直线度误差的计算机算法鲍雁丽（杭州西湖台钻厂，杭州３１００１１）赵旭光（杭州东方电子设备厂，杭州３１０００９）直线度误差的评定一般可采用两端点法，最小二乘法和优化逼近法等。但这些方法都不符合“最小条件”评定原则。为了解决这个问题，本文给出的计算方...     

形状误差的优化算法

提出了一种应用优化技术计算形状误差值的方法,给出了计算直线度、平面度、圆度、圆柱度的误差值的实例。算法对误差的评定基于“最小区域法”,采用Powell优化方法进行求解。     

一种实时对中监测装置原理及误差分析研究

设计出了一种可实现实时对中监测的装置。该装置可以在静态和设备运行时进行对中状态监测，还可对设备或轴系引起的对中状态改变量进行测量。介绍了该装置的结构原理，并对其结构误差进行了讨论，结果表明，该装置的误差很小，可以很好满足工程需要。同时，还对该装置的装配误差进行了分析。     

基于软件实现的误差算法自动分析处理

从测量数据的误差分析与处理角度出发,详细分析误差处理算法,用C语言编程实现误差算法的自动计算,将繁琐的误差计算交由计算机处理,从而实现误差的自动分析处理,为科研和工程领域提供快速的误差分析和处理工具。     

形状误差统一算法的研究

本文运用线性极差和优化理论,将形状误差的评定归为线性规划的求解,研究出简单、精确、有效的统一算法,克服了置换、组合中多次循环的弊端,为基层厂矿提供了有效的实施方法。     

形位误差的进化算法

在分析以往形位误差评价方法的基础上,提出了一种基于遗传进化理论的形位误差评价的智能方法。中以平面度误差为例,详细地介绍了进化模型的建立及计算方法。最后,通过不同评价方法对一平面的平面度误差进行对照实验,结果证明该方法是正确可行的。     

坐标测量机方位误差软件的算法研究

本文研究了坐标测量机应用软件中方位误差计算的算法，分析了要素的构成性质，定义边界和相互作用对计算方位误差的影响，提出了方位误差软件的标准与软件检定的概念。     

Harmonic Power Standard at NIM and Its Compensation Algorithm

A new harmonic power standard has been developed at the National Institute of Metrology (NIM), Beijing, China, for the calibration of harmonic power analyzers under nonsinusoidal conditions at fundamental frequencies of 50 and 60 Hz. The standard is based on digital sampling techniques that do not require synchronization. A compensation algorithm is presented in this paper. A new definition of the uncertainty for harmonic measurement is proposed that is referred to the fundamental. A characterization signal and its application are introduced. Results have shown that over its operating range of up to 50 A, 500 V, and the sixtieth-order harmonic, the harmonic power standard has uncertainties $(k =2)$ of less than 30 $muhbox{V/V}$, 36 $mu hbox{A/A}$, and 42 $muhbox{W/VA}$ for voltage, current, and power measurements, respectively.      

高压直流输电系统谐波的时域和频域分析

本文论述了高压直流输电系统的两种主要的谐波分析方法—时域分析法和频域分析法,揭示了系统的谐波源,讨论了两种方法各自的优缺点,并详细分析了他们在电力网络谐波计算中的适用性。     

Triangular Self-Convolution Window With Desirable Sidelobe Behaviors for Harmonic Analysis of Power System

Weak harmonic components can easily be obscured by nearby strong harmonics due to the spectral leakage in the power system. To obtain a window suitable for solving the problem, the Triangular self-convolution window (TSCW) is constructed, with the Triangular window being the parent window to take advantages of its narrow major lobe and simple computation. A TSCW-based phase difference correction algorithm for calculating the power system signal parameters, such as frequency, phase, and amplitude, is presented in this paper. The TSCW has a low peak sidelobe level, a high sidelobe rolloff rate, and a simple spectral representation. Leakage errors and harmonic interferences are thus considerably reduced by weighting samples with the TSCW. The TSCW-based phase difference correction algorithm is free of solving high-order equations, and the overall method can easily be implemented in embedded systems. The effectiveness of the method proposed was analyzed by means of computer simulations and practical experiments for multifrequency signals without noise and with quantization noise.      

A Small Low-Cost Hybrid Orientation System and Its Error Analysis

Inertial orientation systems have many potential uses beyond air- and spacecraft applications. Compared to the conventional large-scale system, the novel aspects of an orientation system based on micro electromechanical systems (MEMS) are small size, lightweight, low-power consumption, and low cost by the inclusion of microsensors with on-chip functionality, such as micromachined rate gyroscopes, accelerometers, and etc. However, the performance associated with these low-cost MEMS sensors is generally not satisfied. A conventional strapdown method based on integral of angular rate to figure out attitudes will inevitably induce long-term drift. For eliminating this accumulative error and thus using the low-cost navigation system for a long-duration mission, a hybrid configuration by combining a MEMS-based azimuth-level detector with the conventional strapdown system is proposed in this paper. The azimuth-level detector is composed of three-axis MEMS accelerometers and three-axis MEMS magnetometers. With an absolute solution based on the gravity and the earth magnetic field rather than the integral algorithm, attitude and heading estimation without drift errors can be obtained so as to facilitate adjusting the attitude and heading for the conventional strapdown system. The hierarchical computation process for estimating the attitude and heading using the hybrid system is depicted first. Then, comprehensive system errors including transformation errors of the computation, such as skew, scale, and drift errors, are analyzed. Finally, it is verified by both of formula analysis and experimental test that the accumulative errors can be effectively eliminated via this hybrid scheme.      

液体质量控制中的动态误差分析及应用

本文对生产过程中液体流量质量控制的动态控制误差进行了分析,并设计了一种利用慢进值和提前量来减小误差的控制系统,实践证明,该系统对生产过程中的自动投料控制精确,对化工或医药企业中的精确配比投料有很强的实用性。     

低压岸电系统及其效益分析

岸电系统对于电厂尤其是下水煤电厂的环保工作具有重要意义。在保证安全环保可靠的基础上,提出了一种适合电厂码头实际运行需要的系统结构;与传统的岸电相比,提出了变频及并网的概念,并可同时兼容400 V/50 Hz、440 V/60 Hz这2种制式的船舶靠港对接。分析了电缆收放系统以及并网存在的主要问题,最后对成本及收益进行了分析,指出这样的结构会使系统的成本大大降低,同时利用电厂在电价方面的优势,低压岸电系统可以在下水煤电厂得到大规模的推广应用。     

高精度圆度仪误差分离装置研制及测量不确定度分析

介绍了一种由程控型多齿分度台和高精度圆度仪组合而成的全自动误差分离装置,该装置能够使圆度仪主轴回转误差从被测工件测量结果中可靠分离,从而极大地提高了圆度测量不确定度,本文对该装置测量不确定度进行了分析。     

数字压力表误差补偿设计与算法分析

为使数字压力表在使用条件下能达到JJG 875-2019《数字压力计》规程规定的技术指标,分析各种影响量与测量结果的关系,以设计的0.01级数字压力表为例,研究软件非线性补偿和硬件补偿后结合后的综合误差,得到最终的试验数据,试验结果表明传感器本身的温度系数对测量结果影响最大.