共查询到20条相似文献,搜索用时 62 毫秒
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本文叙述了商品量检验(定量包装商品净含量检验)中称重数据自动采集软件设计的过程,介绍了软件的基本功能及其特点. 相似文献
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模糊控制算法在定量包装机中的应用 总被引:4,自引:3,他引:1
介绍了定量包装的工作原理,针对动态称重过程的被控对象存在惯性及时滞时变的非线性特性,设计了基于ARM控制器和模糊控制的定量包装自动控制系统,并介绍了模糊控制算法实现的细节。试验表明,该系统能较好地实现精准定量包装。 相似文献
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针对样品煤粉末状的特点,提出了一种基于PLC控制器的样品煤自动采样包装控制系统。实现了随机采样、自动称重、自动包装以及自动封口等工作过程的自动控制,具有浪费少、控制方便、自动零位整定和动态称量计量等功能,可用于各种粉末状、颗粒状等样品煤采样称重包装。系统在现场试验中的各项性能指标稳定、可靠。 相似文献
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由江苏无锡染整环保设备厂开发研制的 DCS 型氯化铵自动定量包装机,最近已通过化工部组织的专家评审。该机可用于氯化铵产品的包装,各项性能指标先进,并吸收了国外通用型粉料自动定量包装机的优点,采用了微机技术,选用了先进的智能电子秤,实现了误差自动修正,自动去皮、数字滤波等软件技术,计量精度高,动态测定稳定性好.单袋包装精度、平均误差、包装能力等主要技术指标均已达到部颁标准。其主要部件都采用不锈钢制造,增强了抗腐蚀能力。该机的研制成功,为我国填补了一项空白,并为开发氯化铵产品自动定量包装机的系列 相似文献
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A method is proposed for estimating the parameters of a mixture of exponential and Weibull distributions for which the accuracy of preliminary estimates obtained by graphical analysis is refined in accordance with the criterion of maximum likelihood. The efficiency of the proposed method is supported by the results of statistical modeling. 相似文献
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An approximate analytical expression is derived for the velocity of the front of the wave of change of boiling modes on a
rod and on a plate. The impact of the Thomson effect and of the heater orientation in the gravity field is included. Adequate
agreement is demonstrated between the derived relations and experimental data. 相似文献
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水三相点是开尔文热力学温度的唯一基准点,也是ITS-90国际温标重要的定义固定点。因此,水三相点不确定度分析对整个温标的建立、温度量值传递起着至关重要的作用。近3年来,中国计量科学研究院研制出一系列高质量的水三相点容器,加强了水三相点的研究,为不确定度的分析提供了更为可靠的实验依据。同时,不确定度的分析也是客观评价新研制容器性能的一个重要指标。因此,根据实验结果对新研制容器所复现的水三相点进行了不确定度评定。评定结果表明,其扩展不确定度为0.16mK(k=2.69,P=0.99)。 相似文献
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Liebert A Wabnitz H Grosenick D Möller M Macdonald R Rinneberg H 《Applied optics》2003,42(28):5785-5792
A novel method for the determination of the optical properties of tissue from time-domain measurements is presented. The data analysis is based on the evaluation of the first moment and the second centralized moment, i.e., the mean time of flight and the variance of the measured distribution of times of flight (DTOF) of photons injected by short (picosecond) laser pulses. Analytical expressions are derived for calculation of absorption and of reduced scattering coefficients from these moments by application of diffusion theory for infinite and semi-infinite homogeneous media. The proposed method was tested on experimental data obtained with phantoms, and results for absorption and reduced scattering coefficients obtained by the proposed method are compared with those obtained by fitting of the same data with analytical solutions of the diffusion equation. Furthermore, the accuracy of the moment analysis was investigated for a range of integration limits of the DTOF. The moment analysis may serve as a comparatively fast method for evaluating optical properties with sufficient accuracy and can be used, e.g., for on-line monitoring of optical properties of biological tissue. 相似文献
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