共查询到18条相似文献,搜索用时 78 毫秒
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PH9/PH10回转体的回转误差及其补偿 总被引:3,自引:0,他引:3
本文分析PH9/PH10回转体的回转误差来源,定义了六个分项误差,进行了各项误差的检测实验,并补偿了其中的系统邮PH9/PH10回转体的定位精度,从而实现三坐标测量机回转测头系统的一次性标定。 相似文献
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工业废水的处理过程中,经常要遇到PH值的测量问题。对于酸、碱废水的中和处理而言,PH值更是控制投药量和显示废水处理是否达标的最关键指标,及时、准确地测量出废水的PH值就显得尤为重要。但是,因为废水的种类千变万化,采用的废水处理方式也不 相似文献
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高精度PH测量仪表的研制 总被引:1,自引:0,他引:1
本文探讨PH测量仪表的基本原理及设计方法.该仪表以8032单片机为核心,具有PH电极自动标定与温度自动补偿功能.独特的电路设计、标定方法和温度补偿算法使仪表精度高(不低于0.01%),操作方便,可靠性好. 相似文献
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苏恩民 《工业仪表与自动化装置》1983,(2)
一、概述在整个制糖过程特别是压榨和澄清工序中,调节系统比较多,除温度、压力、流量、液位等常规调节系统外,还有六,七个PH调节系统,约占全部调节系统的一半。由此可见,PH调节系统的优劣,将直接影响产品的质量。然而PH调节系统历来就是一个大难题,主要有三大难关:其一是检测信号不准;其二是无专用的执行器;其三是对象的非线性问题,要求调节规律与之相适应,而国内的Ⅱ型仪表无非线性调节器。我们经过了几年不断地摸索实践,已解决了两大难关,即检测电极和执行机 相似文献
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冯方方 《工业仪表与自动化装置》1983,(6)
研制一种基于荧光特性随PH值或金属离子浓度而变化的固定试剂的传感器,是当前人们很感兴趣的一个课题。为此,我们首先研究了基于固定荧光素胺的PH计。之所以作这种选择是因为它的操作简便,胺的化合物易于固定于固态载体上,而且,荧光素是一种有效荧光团。此外,酸碱反应很快,而其动态变化较慢,不会出现复杂的情况。这种基于固定荧光素试剂的PH计是具有生命力的,并且我们已经找到了它的某些特性。试验情况 相似文献
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Javad Jahanpour Mi-Ching Tsai Ming-Yang Cheng 《The International Journal of Advanced Manufacturing Technology》2010,49(5-8):663-674
This paper presents a C2 Pythagorean hodograph (PH) spline curve constructed by the non-uniform rational B-spline (NURBS) curve for high-speed contouring control. With the knot vector, weights, and control points given, the C2 PH spline curve is defined to be a “good” interpolant for Hermit data obtained from a NURBS curve of degree 3 specified by the same control polygon, weights, and the knot vector. To this end, the first- and second-order derivatives are evaluated at the nodal points on the NURBS curve. These boundary conditions are imposed on the PH segments of degree 9 to preserve continuity between the connecting segments. The S-curve motion planning architecture with variable feed rate for a planar NURBS-based C2 PH spline curve is also developed in this paper. In particular, C1 cubic feed acceleration/deceleration is imposed on the first and last PH segments. Several NURBS-based C2 PH spline curve-following tasks were conducted to verify the effectiveness of the proposed interpolation algorithm. Experimental results show that the proposed interpolator is not only feasible for machining the complicated parametric curves represented in the NURBS-based C2 PH spline form but also yields satisfactory contouring performance under variable feed rate control. 相似文献
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本文主要介绍了一款基于PSoC3的便携式PH检测仪的设计,该系统主要由主控芯片、数模转换电路、电容感应模块和液晶显示电路四个部分构成。本文主要介绍了采用PSoC3所设计的便携式PH检测仪的工作原理、系统框图及各个功能模块的软硬件设计,给出了相应的电路原理图和程序流程图。本系统具有结构紧凑、可靠便携等优点,能够很好地满足实际测量的需求。 相似文献
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对企业协同网络的效率进行客观量化分析和评价,是保障与推动商务链协调优化、实现网络最优协同的重要环节。在分析协同商务链多层次、多相位复杂随机现象的基础上,给出了系统服从位相型随机分布的证明,提出了复杂协同体系效率的计算方法与量化表达。该方法具有应用范围广和易于解析处理的优点。 相似文献
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基于TMP80PH40的变频控制系统 总被引:3,自引:1,他引:3
在全面分析研究了无位置传感器无刷直流电动机运行方式的基础上,给出了电动机的转子相位判断、反电动势检测和启动的原理。给出了无刷直流电动机变频控制系统的硬件结构和软件设计流程。该系统以TMP80PH40单片机为控制核心,由IR2103驱动功率场效应管。通过TMP80PH40的PMD功能模块实现了无位置传感器无刷直流电动机的位置功能、过载保护和位置检测。实验结果表明,该系统实现了电动机的变频调速运行。 相似文献
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Referencing special energy model, a new gun drill mechanics model was established and the influence of the cutting parameters on axial force and torque was based on 15-5PH solid solution stainless steel through theoretical analysis and cutting tests. On the basis of the existing model, the model coefficients were modified under various cutting conditions and the integral area of the cutting edge was enlarged. The eccentricity at the bottom of the drill groove was taken into account in the integral area of the cutting edge. In the meanwhile, the torque calculation was simplified reasonably according to the theoretical analysis. The feasibility of the model was verified by experiments and the influence of cutting parameters on the axial force and torque was analyzed. The experiment data had shown that the relative error between the calculated values and the experimental values were within the acceptable range. The axial force and torque increased with the increase in cutting speed and feed rate. 相似文献