称重传感器电路补偿机理及补偿电阻计算

本文介绍了应变式称重传感器电路补偿与调整中的零点温度补偿、零点输出调整、线性补偿、灵敏度温度补偿机理及影响因素,以理论分析为依据,分别推算出零点温度补偿电阻Rt、零点输出调整电阻Rz、线性补偿电阻RL、灵敏度温度补偿电阻RMt的理论与经验计算公式。并简要介绍了这几项电路补偿与调整工艺要点,分析了在生产实践中应用这些补偿电阻计算公式应注意的问题。     

也谈电阻应变式称重传感器零点温度补偿

通过电阻应变式称重传感器零点温漂机理的分析,初步探讨零点温漂补及灵敏系数温度补偿原理和补偿方案。     

扩散硅压力变送器温度补偿技术

本文介绍了生产中实用的扩散硅式变送器电路、新的硅杯电阻测试方法、零点的两点式温度补偿以及三点式补偿、变送器误差修正法量程补偿、量程锅底型温漂的补偿以及迁移温漂补偿。     

应变片零点温漂温度补偿的分析及计算公式的探讨

本文探讨了应变片零点温漂温度补偿的有关问题,其中包括影响应变片零点温漂的因素及零点温漂的补偿公式。文中提出的公式系作者多年研究的结果,不仅是经过了大量的实验,而且也从理论上进行了分析,而过去在书本上只有一般的经验公式。此公式对有关人员具有一定的参考价值。     

浅谈数字化称重传感器的零点温度补偿技术

数字化称重传感器在软、硬件技术上采用当今国际最先进的零点温度自动跟踪补偿技术,高灵敏度、高精度、高稳定性是传统模拟电阻零点温度补偿技术远远所不能比拟的。     

浅谈数字化称重传感器的零点温度补偿技术(接4期)

数字化称重传感器在软、硬件技术上采用当今国际最先进的零点温度自动跟踪补偿技术,高灵敏度、高精度、高稳定性是传统模拟电阻零点温度补偿技术远远所不能比拟的.     

浅谈数字化称重传感器的零点温度补偿技术

数字化称重传感器在软、硬件技术上采用当今国际最先进的零点温度自动跟踪补偿技术，高灵敏度、高精度、高稳定性是传统模拟电阻零点温度补偿技术远远所不能比拟的。     

应变式称重传感器的电路补偿与调整

本文分析了应变式称重传感器初始电路的输出特性较大的偏离理想输出特性的各种影响因素，介绍了为提高称重传感器综合性能指标和互换性而进行的温度补偿、零点输出补偿、线性补偿、灵敏度温度补偿、灵敏度标准化调整、输出与输入电阻标准化调整的基本原理和方法，并从补偿机理上推导出几种补偿电阻的计算公式。     

传感器零点温度补偿方法的分析与探讨

本文详细描述了计算电阻法及调整电压法进行传感器零点补偿的基本原理。分析了两种方法在实践应用中的利弊关系，并探讨了实际操作中的注意事项。     

导线电阻在不同测量桥路中对应变读数的影响

本文介绍了10种电阻应变测量线路中导线电阻对应变读数的影响,给出了修正公式,并介绍了一种简便的验证修正公式的方法。文末给出了一些试验数据,其试验结果与理论值是比较符合的。这10种线路基本上概括了应变测量中经常遇到的线路。用文中的推导方法,还可以推导出本文没有提到的应变测量线路的修正公式。本文目的是对导线电阻在不同测量桥路中对应变读数的修正公式做一归纳,以供从事该项工作的同志参考。     

基于虚拟仪器的压力传感器自动补偿校正系统

针对压力传感器的误差和温度漂移问题，推导了传感器组件的输出电压与压力、温度的关系，并提出了一种基于虚拟仪器技术的压力传感器自动补偿校正系统。该系统能对压力传感器的零点误差、灵敏度误差和温度漂移进行自动的补偿校正。实际测试显示，补偿校正前传感器相对期望值的精度≤13．2％，经补偿校正后，传感器组件相对期望值的精度≤1％。这说明该系统可高效地对压力传感器进行补偿校正，且补偿校正效果好，适合对压力传感器进行批量补偿校正。     

Ambient pressure compensation for hermetically sealed force transducers

Readings of hermetically sealed force transducers are affected by fluctuations in atmospheric pressure, and measured deflections vary when the ambient pressure changes quickly between two readings at zero force and at a certain force step. For some types of force transducers, readings at the zero point are quite sensitive to the ambient pressure change and this influence is not negligible. By periodically repeating measurements on two force transducers, it was verified that the repeatability of the measurements can be improved, and hence calibration uncertainty can be reduced to some extent, by compensating for deflections of the force transducers due to ambient pressure fluctuations by referring to the zero sensitivity.     

变轴交角渐开线齿轮啮合理论和设计

为了提供合理的变轴交角渐开线齿轮传动设计方法,基于双自由度齿轮啮合理论,对这种传动进行了研究。在轴交角变动范围内,由相配齿轮2齿面无根切导出两轮支座摆动轴线位置和相配齿轮2工作齿宽的计算公式,得到支座摆动轴线与渐开线齿轮1轴线间距l1的许用最小值l1min和最大值l1max;得到不同轴交角 时的重合度计算公式;推导出啮合点瞬时接触椭圆参数的计算公式。研究表明：取l1接近l1max时,相配齿轮2工作齿宽最大;轴交角| |为最大时重合度ε最大,=0时ε最小;相配齿轮2中断面分度圆啮合点处的瞬时接触椭圆参数接近其余各点的平均值,可由该点来评价接触质量,使计算大为简化。为这种传动的几何设计,提供一套详尽的计算方法。     

Analysis of damping resistor’s effects on pulse response of self-integrating Rogowski coil with magnetic core

A self-integrating Rogowski coil with magnetic core is investigated for accurate measurement of high-impulse current in this paper. Usually, the distributed parameters of Rogowski coil generate deleterious high-frequency resonant signal parasitizing in the useful signal of the coil circuit. Damping resistors can be used to eliminate the parasitic resonant component of the signal. In this paper, damping effects of the damping resistors on the output signal of Rogowski coil are studied in detail. According to circuit theory, approximate circuit equations of Rogowski coil with lumped parameters in simplification are put forward. Response signal of coil is analyzed and a reasonable method for choosing damping resistance is also presented. When the 50 Ω damping resistance is used, the amplitude of parasitic resonant signal has been damped by 5.7 times in contrast to the situation without any damping resistance. Result of Pspice circuit simulation corresponds to the theoretical calculation result. A standard 10 ns square pulse has been used to calibrate the coil signal before and after the damping resistors soldering on the coil, respectively. Experimental results show that the response time of the coil with magnetic core is 1.1 ns and the parasitic resonance in the coil signal is almost eliminated. The coil can accurately detect high-pulse current at kA range.     

热轧立辊电液伺服系统的自适应模糊控制

以热轧立辊为研究背景,针对其液压伺服系统存在的非线性、参数不确定性以及负载干扰等特点,基于模糊基函数网络提出一种自适应控制方法.首先将非线性系统线性化并将其作为已知系统,利用这部分已知的动态特性设计反馈控制使标称系统稳定.然后利用模糊基函数网络仅学习非线性系统不确定性的上界,将输出作为补偿控制器的参数,并在Lyapunov稳定意义下构造自适应控制器,该自适应控制器不仅确保了闭环系统的鲁棒性而且加快了跟踪误差的收敛速度.将该控制器应用于某热轧立辊电液位置伺服系统中进行仿真研究,结果表明,该控制器优于传统的PID控制器,可以取得较好的控制效果.     

新型球面并联人形机器人踝关节机构静力学性能分析

采用拆杆法建立机构的静力学平衡方程,考虑构件弹性,利用小变形叠加原理建立机构的变形协调补充方程,进而完成二自由度并联人形机器人踝关节机构的静力学分析。通过数值计算,得到在三种外载荷下构件上的各力与机构位姿的关系图。结果表明:外载荷为纯力时,支链1的受力很小,支链2的受力近似为零,而中心球面副支链的受力近似等于外载荷;外载荷为纯力矩时,三个支链的受力情况相似;外载荷为力和力矩时,支链1、支链2的受力情况与外载荷为纯力矩时的受力情况相似,中心球面副支链的受力为前两种情况的叠加。外载荷中的力成分主要由中心球面副支链承载,力矩成分由三个支链共同承载。该研究为该人形机器人踝关节机构在工程中的结构设计与应用提供了静力学参考。     

Determination of Performance Characteristics of Hydrostatic Bearing Systems that Support a Rigid Body

An analysis of a system of hydrostatic bearings used to support a rigid structure subjected to either specified loads or movements is described, and results of sample problems are shown. The governing equations are developed, considering generalized system supply circuitry and arbitrary selection of fixed type compensating elements for each bearing. The equations have been programmed for solution on a high-speed digital computer. The methods of solution and conceptual flow chart of the program are described. From specified loads (or alternatively displacements) of a point on the body chosen as the origin, individual bearing performance parameters, resultant body displacements (or alternatively loads), and the hydraulic system parameters are determined.     

A simple centroid-based method to find the principal point of an image plane for a pincushion distortion

A method to find the principal point of an image plane is proposed in this paper for the case of a pincushion distortion. The analytical foundation of the method is that a pincushion distortion causes a pair of distortion-free parallel lines to become a pair of curves, which are termed conjugate curves in this paper, and the shortest line segment connecting the pair of conjugate curves passes through the principal point. Thus, the principal point can be obtained by computing the intersection point of the shortest line segments of different pairs of conjugate curves. However, the case for a digital image is a bit different from the above. For the same pair of conjugate curves, there is a group of shortest line segments, which is called a shortest segment set. The coincidence region of the shortest segment sets of different pairs of conjugate curves is a polygon, the centroid of which is considered as the principal point. Therefore, the proposed method firstly needs to capture the pincushion-distorted images of some pairs of parallel lines, secondly to find the corresponding polygon and lastly, to calculate the centroid point. A synthetic image and a real image are tested using this method, and the results are satisfying.     

Analytical calculation of sensitivity for Coriolis mass flowmeter

A simple analytical method is introduced to calculate the sensitivity of Coriolis mass flowmeter (CMF). The definition of the sensitivity is further developed based on the reciprocity principle, through employing two approaches: selecting the moment when the displacement of drive point is zero as the calculation moment; reducing the degree of high-order static indeterminacy by taking a half of the structure due to symmetry in structure and anti-symmetry in load. With these approaches, the method can be used to calculate sensitivities for the flowmeters with any shaped tubes and anywhere detected positions; thus, provides theory basis for tube shape design and detected positions determination. Detail analytical calculations for typical Straight-Circle-joint-shaped CMFs are illustrated. The method is validated on a published U-CMF and then, is further illustrated and experimentally validated through predicting the most sensitive detected point for a narrowed-U-CMF.