模糊AHP在职工绩效考核中的应用

将模糊数学概念引入ＡＨＰ中构成模糊ＡＨＰ,运用于企业职工绩效考核, 效考核的科学性和可靠性,以利调动职工积极性,创造性。     

Comparison of observed ionospheric vertical TEC over the sea in Indian region with IRI-2016 model

The vertical ionospheric TEC values obtained from GAGAN grid based ionospheric delay correction values over the sea in the Indian equatorial region have been compared with the corresponding values derived from the International Reference Ionosphere model, IRI-2016. The objective of this work is to study the deviation of the vertical TEC derived from the IRI model from ground truths over the sea for different conditions. This will serve the basic intention of assessing the candidature of the IRI model as an alternative ionospheric correction model in navigation receivers in terms of accuracy. We have chosen different solar activity periods, seasons, geomagnetic conditions, locations etc. for our comparison and analysis. The TEC values by the IRI-2016 were compared with the actual measured values for the given conditions and errors were obtained. The measured vertical TEC values at the ionospheric grid points were derived from the GAGAN broadcast ionospheric delay data and used as reference. The IRI model with standard internal functions was used in estimating the TEC at the same ionospheric grid points. The errors in the model derived values are statistically analysed. Broadly, the results show that, for the Indian sector over the sea, the IRI model performs better on quiet days in off equatorial regions, particularly in the northern region. The overall performance degrades for other conditions with the model generally underestimating the true TEC values and most severely in the equatorial region. The performance is worst in this region for the disturbed days of the equinoctial period. The comparison study is also done with the TEC data measured directly by dual frequency GPS receivers. The results were found to be in general agreement with those obtained by comparing the model with GAGAN broadcast data as reference. This study will be useful in considering the IRI-2016 model for real time estimates of TEC as an alternative to the current parametric model in a satellite navigation receiver in absence of other options.     

测量不确定度在实际工作中的应用

介绍了运用迭代法进行不确定度评定的方法。讨论了在实际工作中如何应用测量不确定度分析来选择测量方法。     

多轴疲劳寿命分析方法在飞机结构上的应用

针对飞机结构上常见的处于多轴应力应变(比例多轴)状态下的典型结构,采用3种多轴疲劳寿命分析模型,对该结构的疲劳危险部位进行疲劳寿命分析,并与单轴寿命分析方法的分析结果、疲劳试验结果进行了对比分析。首先对该结构进行细节有限元计算,确定结构的应力分布与应力水平,当载荷施加到88%的最大一级的峰值载荷时,疲劳危险部位的孔边即出现显著的塑性应变,因此,选用低周疲劳(LCF)寿命预测模型进行分析。选取的3种分析模型均是基于临界面的分析模型,分别是Wang-Shang模型、Smith-Watson-Topper(SWT)模型以及Morrow-Brown-Miller模型。为验证分析模型工程适用性,开展了该结构的多轴疲劳试验。与试验结果相比,3种分析模型的预测结果均偏大,其中Wang-Shang模型的预测结果最接近试验值,适用于本文这类结构;SWT模型和Morrow-Brown-Miller模型的预测结果误差相对较大。对于处于多轴载荷状态下的结构,应按照多轴疲劳寿命分析方法进行寿命预测,单轴疲劳寿命分析方法将给出过于危险的评定结果。      

曲线管道内颗粒运动及对管壁磨损的数值分析

根据张量分析理论,推导出非正交曲线柱坐标系中颗粒的运动方程。对三种类型弯管内两相流动的颗粒运动轨迹,颗粒与管壁面的碰撞以及颗粒对壁面的磨损进行了数值计算。     

无人机激光相对引导系统设计与试飞验证

为了提高复杂电磁环境下无人机着陆引导系统的抗干扰能力,可在无人机着陆段采用基于激光的无人机精确引导方法.本文对激光相对引导系统的工作原理及流程进行了分析,设计了基于激光引导的无人机着陆试验流程,并基于某无人机平台完成了试飞验证,获得了重要的试验数据,最后将激光相对引导数据与差分GPS引导数据统一转换到地平坐标系下,完成...     

区块链与 5G MEC在军事领域的融合应用

第 5代移动通信技术(5G)与移动边缘计算(Mobile Edge Computing,MEC)的深度融合,实现了省带宽、降时延、均负载和高隔离的目标。为进一步增强军事场景中信息安全保障能力,首先,开展了基础理论研究,梳理了技术发展现状、能力指标和网络架构,为设计区块链与 5G MEC融合架构提供了理论支撑;其次,采用映射方法对民用技术的军事转化与融合改进开展了可行性分析,指出了技术融合的涌现性;此外,基于多视图方法论开展了需求分析,提出了 1种 5G网络架构下 MEC与区块链的融合架构;最后,基于所提系统设计了 3种军事应用场景,并给出了系统参考架构和优化方法。通过分析,3项技术在军事领域的融合应用具有一定的可行性,在综合保障、演训行动和卫勤医疗场景中能够提供安全可信条件下数据的高效处理和灵活流转。     

CAPP系统在航修企业中的应用现状及开发思路的研究

分析CAPP系统在航修企业中的应用现状及存在的问题,总结航修企业工艺设计对CAPP系统提出的要求,论述开发CAPP系统的步骤和在CAPP系统开发中应注意的问题。     

刚 - 挠印制板制作工艺浅析

简要介绍了刚-挠印制板的特点及应用范围,并重点分析了挠性板和刚-挠板的制作工艺难点.