共查询到20条相似文献,搜索用时 62 毫秒
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系统布置设计在生产系统优化中的应用 总被引:4,自引:0,他引:4
基于系统布置设计SLP原理,以X企业新厂房布置设计为例,应用物流相关图和作业单位相互关系图分析系统内部物流关系和非物流关系,形成作业单位综合相互关系图,设计两个可行的布置方案.从物流效率、空间利用率、管理方便性、可扩展性等方面,对两个方案进行比较研究,得出最优方案,从而提高了该企业物流运作效率,达到生产系统优化的目的. 相似文献
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本文以某机械制造公司电机检修车间设施布局为研究对象,详细分析车间布局的基本素,并对产品检修作业单位之间的物流关系和非物流关系进行了定性分析,得出,个层级的物流密切关系,从而得出产品检修作业单位位置相关图。 相似文献
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对我国汽车生产物流行业中存在的职业性肌肉骨骼损伤(OMSD)的危险因素进行分析,发现作业中主要以手工搬运为主,并且自动化程度低。结合已有研究证明的OMSD影响因素和汽车生产物流行业现状,选择了快速上肢评估(RULA)量表进行风险评价,并对作业过程中存在的问题进行改善。得到的结论:(1)快速上肢评估量表能够与汽车生产物流作业现场实际情况相结合,能够准确的对不同的作业工种的肌肉骨骼损伤风险等进行评价。(2)汽车生产物流员工的肌肉骨骼损伤风险较高。(3)应用作业方法改善,辅助作业器具的使用和行政管理方法的调整能够有效地降低肌肉骨骼损伤风险。 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