弹头自动装配机控制系统的设计与应用

针对弹头装配存在的问题,提出一种基于PLC 的弹头自动装配机控制系统。分析弹头装配的现状和存在 的问题,阐述弹头自动装配机的组成和控制系统的功能,设计控制系统的硬件部分,并从专机程序、报警系统、初 始化和自动生产画面4 个方面对控制系统的软件部分进行详细设计。测试结果表明：该系统能实现弹头的自动装配, 提高弹头装配的生产效率和自动化程度。     

基于AMESim的比例溢流阀加载系统建模与分析

设计了比例溢流阀加载系统,分析了系统的工作原理,运用AMESim建立了系统的仿真模型,然后通过改变主阀芯和先导阀芯的质量以及主阀芯的黏性阻尼系数,研究各参数对加载系统动态特性的影响,为比例溢流阀加载系统的设计提供了参考。     

矿用乳化液泵排液阀阀芯的影响及优化

针对BRW200/31.5型矿用乳化液泵在运行中噪声大、排液阀阀芯容易变形以及断裂等问题进行研究。通过对泵建立AMESim模型,分析得到泵的噪声是由于排液阀阀芯撞击引起的;基于ANSYS静力学仿真,对排液阀阀芯在工作情况下的受力以及变形情况进行仿真分析,并通过改变阀芯的结构参数来进一步优化阀芯,为加工制造提供理论依据。     

工程条件下气保护药芯焊丝焊接参数及焊缝波纹的选择

探讨了工程应用中气保护药芯焊丝熔滴过渡形态、主要焊接参数,以及焊缝表面波纹的选择方法。结果表明,大电流、强规范施工中,钛型气保护药芯焊丝的主流过渡形态是非轴向排斥滴状过渡,短路过渡不应成为该工艺的主要过渡形态。焊丝焊接参数选择的"合于使用"原则,强调适合于施工现场使用的焊接参数特征。先电流后电压的参数调节顺序,能顺利获得既定熔滴过渡形态和满意工艺质量。因熔池移动速度与熔滴给进速度不能同步,产生波间距离而形成的焊波,能有效控制气孔(压坑)产生,为该类焊丝焊接性改善提供一个新方向。     

蠕墨铸铁制动盘的质量控制

蠕墨铸铁制动盘采用两步法蠕化处理工艺,通过调整浇注温度、芯砂材料、涂料等措施消除了铸件内腔表面的片状石墨,稳定了铸件的蠕化率、力学性能。生产实践表明:相同条件下,含0.5%左右钛元素的铁液与未含Ti元素的铁液相比,蠕化剂的加入量增加了0.3%~0.35%。另外蠕墨铸铁生产过程中,型砂、芯砂、涂料等辅材的选择非常重要。     

Fundamental study of high Q‐factor RF spiral inductor using carbonyl‐iron/epoxy composite magnetic core

In order to increase the Q‐factor of an RF spiral inductor used in the RF front‐end circuit of smartphone handsets, we introduced a carbonyl‐iron/epoxy composite magnetic core in the air‐core spiral inductor. The composite magnetic core, which was made by metal‐mask printing, consisted of carbonyl‐iron powder of 1.1 μm mean diameter and an epoxy resin matrix. We found that the 45 vol.% CIP composite magnetic core had a saturation magnetization of 0.9 T, relative permeability of ∼6, and loss tangent (tan δ) of ∼0.2 at 1 GHz. A two‐turn copper spiral inductor fabricated with the composite magnetic core filled only in the spacing between the conductor lines showed a clear Q‐factor increase of ∼29% compared to the air‐core spiral inductor at 1 GHz. Thus we obtained a substantial increase in the Q‐factor by the embedded composite magnetic core in the spacing between the conductor lines. The main reason for this is that the magnetic flux passing through the conductor lines was decreased by the magnetic core embedded in the spacing between conductor lines as a result of the magnetic flux passing mainly through the embedded magnetic core. Therefore, proximity effect is suppressed in the conductor line of the spiral coil. © 2016 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.     

Compressed sampling reconstruction of hyperspectral images based on spectral prediction

With increasing amounts of hyperspectral images (HSI) and the limitations of the memory requirements, compressive techniques for hyperspectral images have attracted extensive research efforts in recent years. The main difficulty of applying compressed sampling (CS) theory to compression and reconstruction of hyperspectral images lies in using the spatial correlation and spectral correlation of hyperspectral images. In this paper, a reconstruction algorithm of hyperspectral images taking advantage of two‐dimensional compressed sampling (2DCS) and two‐dimensional total variation (2DTV) incorporating spectral prediction (SP) is investigated. In the sampling process, the hyperspectral images are divided into reference bands and common bands, and all bands are sampled using 2DCS independently. In the reconstruction process, the reference bands are reconstructed by 2DTV first. In order to improve the reconstruction quality of common bands, spectral prediction utilizing the spectral correlation between reference bands and common bands is conducted. Then the spectral compensation is computed by using a combination of the prediction value and the initial approximation for the common bands. The residual between the compensation value and the original value is obtained to revise the approximation for the common bands. The algorithm is implemented in an iterative manner to enhance the performance. Experimental results on popular hyperspectral datasets reveal that the proposed algorithm exploiting spectral prediction outperforms the algorithm 2DCS‐2DTV, which does not use spectral correlation, as well as the state‐of‐the‐art algorithms in terms of peak signal‐to‐noise ratio (PSNR). In particular, when the sampling rate of the reference bands is higher than that of the common bands, the proposed algorithm would improve the reconstruction quality dramatically. © 2015 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.     

山东省苍峄铁矿兰陵矿区岩矿芯缩减方案及其意义

近些年来,随着我国地质勘查工作的快速发展,全国范围内产生了数量巨大的岩矿芯等实物资料,根据1990年颁发的《岩矿芯管理通则》的规定要求,由于岩芯增长数量成爆炸式增长,各岩芯产生及保管单位原有的保管库房已远远不能满足保管需求。因此,为了更有效的开展岩芯保管工作,根据"科学论证,慎重处置"的原则,按照规定的工作程序和技术方法对岩矿芯进行缩减已成为必然趋势。     

基于能量系数的损伤控制结构评估及其在钢框架中的应用

根据改进的能量平衡关系,推导了具有较大屈服后刚度系数的损伤控制单自由度体系的能量系数。采用非线性时程分析研究了地震作用下屈服后刚度系数及屈服时序对能量系数的影响。将能量平衡关系推广至多自由度体系,基于能量系数提出了用于判定损伤控制结构的评估方法,并将其用于损伤控制钢框架的评估。结合对损伤控制钢框架的评估分析说明了建议方法的应用,并通过非线性时程分析进行了校验。结果表明,能量系数对结构的屈服时序敏感,建议方法有良好的精度,可用于损伤控制结构的评估和优化设计。     

超高层核心筒液压爬模施工技术

北京绿地中心超高层工程在核心筒结构施工中采用液压爬模体系,保证了核心筒墙体结构安全。同时,施工中针对水平构件钢筋连接做法、墙体变截面、桁架层托座、塔式起重机爬升等施工难点提前制订了一系列措施,特别针对高空消防安全采取了预控措施,取得了良好的效果。