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钢结构在爆炸冲击下的动态响应是一个复杂的动力学问题。运用ABAQUS软件,建立两端固定约束下变截面H型钢构件模型,利用CONWEP爆炸加载方式,模拟3~8.25 m八种不同爆炸距离下钢构件的动态响应过程,分析结构腹板、迎爆面翼缘变形与爆炸距离的关系。结果表明:CONWEP程序能够准确的作为爆炸加载方式;在3~6.75 m爆炸距离内,腹板发生塑性变形,随着爆炸距离的增加,构件腹板最大位移线性减小,最大位移位置非线性升高;翼缘最大位移迅速减小,翼缘发生失稳破坏;在6.75~7.5 m爆炸距离内,腹板处于弹塑性变形阶段;当爆炸距离超过7.5 m后,腹板处于弹性变形阶段,迎爆面翼缘发生局部失稳,承载力降低。 相似文献
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针对破片杀伤弹内层壳体外刻槽的双层壳体结构,利用LS-DYNA有限元分析软件对比分析了内壳刻槽参数对外壳破裂成型的影响。结果表明,同种工况下,U形刻槽和梯形刻槽内壳聚能装药结构外层壳体破碎成型优于V形槽,且在刻槽角度为45°和50°工况下,内壳梯形刻槽结构使外层壳体破片总动能最大;内壳的厚度、相对刻槽深度和刻槽角度均会影响该结构外层壳体破片成型,且内壳厚度影响最大,刻槽角度次之,相对刻槽深度最小;内壳厚度在1 mm~3 mm区间内,装药结构外层壳体破碎成型效果存在最优值,且装药直径为40 mm时,内壳最佳厚度为2 mm。 相似文献
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乳清蛋白改性的研究进展 总被引:3,自引:0,他引:3
乳清蛋白具有多种功能特性,例如乳化性、成胶性和起泡性,广泛地应用于食品中.许多研究证明,通过改性可进一步改善乳清蛋白的功能特性,开发新型的功能性乳清蛋白配料,拓展其在食品工业中的应用范围.乳清蛋白的改性方法包括物理、化学和酶法改性以及相互结合的方法,选择性使用改性方法、控制反应条件可以改善所需的功能特性.通过美拉德反应对乳清蛋白的糖基化改性是一种比较新的方法,但已经成为食品中研究的热点. 相似文献
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为了增强水力旋流器对小粒径油滴的分离性能,基于旋流分离原理提出一种可通过增大油滴间碰撞机率使小油滴碰撞聚结的水力聚结器结构.借助正交试验方法对水力聚结器的主要结构参数进行优化设计,利用Euler-Euler模型与群体平衡模型(Population Balance Model,PBM)相结合的方法,开展水力聚结器结构参数对油滴分布特性及聚结性能的影响研究,得出聚结器内油滴粒度分布聚结性能受结构参数变化的影响规律,并获得了最佳的结构参数配比.结果 表明:水力聚结器对油水混合液中的油滴呈现出了较好的聚结效果,聚结器的聚结内芯底径D3、锥段长度L4、出口管长度L5均会对聚结器内油滴粒径分布产生影响,且各参数对聚结性能影响显著性由高到低为D3>L4>L5.优化得出最佳结构参数配比方案为C3A2B2(L4=600mm、L5=100mm、D3=10mm),最佳结构参数条件下混合液中油滴粒度分布在25 ~ 55 μm时,经水力聚结器聚结后油滴粒度分布均值增加到524.7 μm,较初始结构聚结后的平均粒径增加了48.56%. 相似文献
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On HL-2A, the ion temperature profile can be roughly estimated by analyzing the energy spectrum of the neutral particles that escape from core plasma through 11 different spatial channels. However, this profile deviates from the real radial distribution because of the averaging and attenuation effects. The DEGAS code is used to estimate these effects and reconstruct a more reasonable ion temperature profile by simulating these neutral spectra and making them conform to the measurements. In this paper, critical parameters that affect the escaped neutral spectra are enumerated, and an example of a reconstruction of the ion temperature profile is presented based on experimental data. 相似文献
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In HL-2A tokamaks, the behavior of heat flux deposited on the divertor targets has been studied during deuterium gas fuelling. The heat flux is reduced significantly after supersonic molecular beam injection (SMBI) fuelling during Ohmic and electron cyclotron resonance heating (ECRH) divertor discharges. The SMBI fuelling causes an increase in the plasma density and this change results in the experienced change of the edge properties. Most of this reduction in divertor target heat flux occurs together with a high plasma radiation region located at near the X-point. The largest reduction in heat flux profiles is observed at the outboard divertor separatrix strike point, while the heat flux far from the strike point remains almost unchanged. In particular, with SMBI multi-pulses gas fuelling, a partially detached divertor regime is observed with a highly radiating region at the X-point. With the onset of the partially detached divertor regime, a sudden drop in both heat flux and power flow on the divertor target is observed. The reduction in power load on the divertor targets is roughly equal to the increase in plasma radiation loss. 相似文献
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