Temperature influences of the recoil characteristics for aluminum honeycomb buffer in the tether-net launcher

Fluctuations in outer space's temperature would affect the spacecraft's regular operation.This paper aims to study the temperature influences of the aluminum honeycomb buffer in the tether-net launcher.Firstly,a buffer structure was designed to attenuate the pyroshock generated by the pyrotechnic device.Secondly,the mechanical properties of aluminum honeycomb at different temperatures were obtained through quasi-static compression experiments.Then,the internal ballistic responses of the launcher were gained by the closed bomb tests and the equivalent classical interior ballistic model.Finally,the recoil performance of the launcher with aluminum honeycomb buffer at different temperatures was studied.It is revealed that the aluminum honeycomb crushing force gradually decreases with the temperature increases.The peak pressure,burning rate coefficient and velocity increase while the peak time decreases with the temperature increase for the interior ballistics.For the launcher recoil responses,the average launch recoil decreases if the aluminum honeycomb doesn't enter the dense stage.The impact acceleration,projectile velocity and displacement increase as the temperature increase.The paper spotlights the temperature's influence on the recoil characteristics of the aluminum honeycomb buffer,which provides a new idea for buffering technology of pyrotechnic devices in a complex space environment.

Predicting test data of aluminum honeycomb sandwich board based on volterra adaptive filters

Random vibration test was done on aluminum honeycomb sandwich board. The result suggested that chaotic behavior is found in the test data. The Volterra expression can not be gained from the input and output data directly in this paper. The state space reconstruction was used to convert the system observed data into the quasi-input/output pairs, and the second-order Voherra adaptive filter was used to predict the test data. It is shown that combining the state space reconstruction with the Volterra adaptive filter, these chaotic series could be accurately predicted.

Anti-explosion performance and dynamic response of an innovative multi-layer composite explosion containment vessel

An innovative multi-layer composite explosion containment vessel(CECV)utilizing a sliding steel platealuminum honeycomb-fiber cloth sandwich is put forward to improve the anti-explosion capacity of a conventional single-layer explosion containment vessel(SECV).Firstly,a series of experiments and finite element(FE)simulations of internal explosions are implemented to understand the basic anti-explosion characteristics of a SECV and the rationality of the computational models and methods is verified by the comparison between the experimental results and simulation results.Based on this,the CECV is designed in detail and a variety of FE simulations are carried out to investigate effects of the sandwich structure,the explosive quantity and the laying mode of the fiber cloth on anti-explosion performance and dynamic response of the CECV under internal explosions.Simulation results indicate that the end cover is the critical position for both the SECV and CECV.The maximum pressure of the explosion shock wave and the maximum strain of the CECV can be extremely declined compared to those of the SECV.As a result,the explosive quantity the CECV can sustain is up to 20 times of that the SECV can sustain.Besides,as the explosive quantity increases,the internal pressure of the CECV keeps growing and the plastic deformation and failure of the sandwich structure become more and more severe,yielding plastic strain of the CECV in addition to elastic strain.The results also reveal that the laying angles of the fiber cloth's five layers have an impact on the anti-explosion performance of the CECV.For example,the CECV with fiber cloth layered in 0°/45°/90°/45°/0°mode has the optimal anti-capacity,compared to 0°/0°/0°/0°/0°and 0°/30°/60°/30°/0°modes.Overall,owing to remarkable anti-explosion capacity,this CECV can be regarded as a promising candidate for explosion resistance.

适应火工装置冲击环境的铝蜂窝缓冲特性研究

针对火工装置发射过程中对卫星平台产生的冲击,设计了一种基于铝蜂窝的新型空间发射缓冲结构,通过火药密爆试验和铝蜂窝准静态压溃试验分别建立了空间火工发射装置内弹道模型和铝蜂窝压溃模型,在此基础上建立了发射后坐动力学模型,并重点研究了火药药量和铝蜂窝内径对发射后坐特性的影响。研究结果表明:当火药药量增大0.3 g,后坐力平均值增大了1.95%,牵引体发射速度增大了5.10%,后坐位移增大了7.64%,后坐力持续时间减小10.3%。当铝蜂窝内径从148 mm分别减小1 mm和2 mm时,后坐力平均值增大了4.06%和9.08%,牵引体发射速度增大了0.22%和0.54%,后坐位移增大了3.38%和15.24%。同时以上参数的合理选择可以有效降低发射后坐力并保证牵引体的发射性能。

电力机车底架前端结构耐撞性拓扑优化研究

为提高电力机车碰撞安全性,文章以某型电力机车车体为研究对象,对底架前端部位开展耐撞性动态拓扑优化研究。首先,建立电力机车有限元模型,通过基于混合元胞自动机法的动态拓扑优化分析得到底架能量流动的主要路径;然后,结合电力机车车体结构特点,对底架前端结构进行优化设计与铝蜂窝吸能材料填充;最后,将优化前后的有限元模型进行碰撞仿真计算对比。研究结果表明:优化后的车体碰撞峰值加速度为402.56 m/s^(2),较优化前的车体碰撞峰值加速度663.04 m/s^(2)降低了39.29%,优化后碰撞峰值界面力比优化前降低35.71%,验证了机车耐撞性结构拓扑优化设计的合理性与有效性,提升了该型机车的耐撞性能。

超声加工铝蜂窝芯的数值模拟与试验研究

铝蜂窝在使用传统加工技术加工时容易受损。为提高铝蜂窝加工表面质量,建立铝蜂窝超声加工切削力数学模型和仿真计算模型,研究网格尺寸对仿真结果的影响,确定合适的网格尺寸,并分析不同加工参数下的切削力和表面形貌。综合评价后选用0.2 mm的网格进行仿真模拟,结果表明随着进给量、主轴转速和切削宽度数值分别增大,加工损伤明显呈下降趋势。研究结果为铝蜂窝超声辅助加工的数值模型、仿真和试验提供了基础。

Analytical and Numerical Investigation on the Penetration Resistance of PUE/Honeycomb Aluminum Composite Structures

In this study,the penetration resistance of a polyurethane elastomer(PUE)/honeycomb aluminum composite structure was investigated.A finite element analysis model was constructed to predict the residual velocity of the projectile after penetrating the PUE/honeycomb aluminum composite structure,and the accuracy of the model was verified through experiments.Both the residual velocity of the projectile and the failure appearance of the target plate were accurately predicted by the model.In addition,the Cowper-Symonds model was used to describe the material properties of the PUE layer,effectively simulating the damage appearance of the PUE layer after penetration.Subsequently,based on the validated model,three different configurations of the PUE/honeycomb aluminum composite structure were designed on the basis of the original honeycomb aluminum composite structure with a polyurethane elastomer coating,maintaining constant mass of the composite structure,and the ballistic performance was predicted using the finite element model.The anti-penetration performance of the PUE/honeycomb aluminum composite structure was analyzed by examining the velocity changes of the projectile,the energy changes of each component,and the crushing of the honeycomb core layer.Finally,the influence of different projectile shapes on the ultimate ballistic performance of the structure was studied,and the reasons for the influence of warhead shape on the appearance of target plate failure were analyzed.

不同结构飞矛对铝蜂窝板侵彻深度的仿真与试验

飞矛作为一种空间碎片清理方式已有许多相关研究,但目前飞矛对目标的附着大多依靠目标对飞矛的挤压摩擦,为能够使飞矛更好地附着到目标上,该研究设计一种光滑型飞矛和一种倒刺型飞矛并对铝蜂窝板进行冲击试验,分析对比飞矛侧面有无倒刺2种情况下对侵彻速度、嵌入深度等的影响。根据试验结果修正仿真模型,并利用仿真继续进行分析。最终结果表明,倒刺型结构的飞矛能够附着到目标上;另外在使用相同速度对铝蜂窝板侵彻时,倒刺型飞矛的嵌入深度先是小于光滑型飞矛,而后又大于光滑型飞矛,并且弹道极限低于光滑型飞矛。

轻质高隔音铝蜂窝板在豪华邮轮中的应用研究

探讨轻质高隔音铝蜂窝板在豪华邮轮中的应用,并对其性能、优势进行了分析。首先介绍轻质高隔音铝蜂窝板的基本结构和特点,包括轻质化、高强度、隔音性能优异等方面。随后,针对豪华邮轮的特殊需求,详细分析了轻质高隔音铝蜂窝板在船舶制造、居住舱室、公共区域和其他设备中的应用情况,并提出了相应的选型方案和影响因素分析。在此基础上,通过对结构强度、舒适性和环保性等方面的影响进行评估,阐述轻质高隔音铝蜂窝板在豪华邮轮中的重要性和优势。

基于蜂窝铝板的FSAE赛车半单体壳车身结构设计与研究

针对FSAE赛车车身结构设计中碳纤维单体壳车身制造工艺复杂、成本高以及传统钢管桁架式车身扭转刚度较低的问题,提出了一种基于蜂窝铝板的新型单体壳车身结构,以实现高扭转刚度和低制造成本的目标。确定了车身扭转刚度和总质量的设计目标,并通过人机工程设计确定了车身的基本尺寸;采用有限元分析方法得出了最优的铺层方案,并对车身在各工况下进行了强度校核分析。研究结果表明,铝合金半单体壳车身具有良好的扭转刚度和轻量化水平,是一种性价比优良的新型车身结构,可替代传统的钢管桁架式车身。本研究为FSAE赛车提供了新的车身设计思路。

陶瓷薄板-铝蜂窝复合幕墙面板温度变形有限元分析

陶瓷薄板和铝蜂窝板的热膨胀系数相差较大,在温度变化较大时将会产生较大的变形。以郑州市幕墙装饰工程为研究背景,基于ANSYS模拟软件进行简便有效的有限元分析,通过参数化建立模型,分析在温度荷载作用下,铝蜂窝芯尺寸和蜂窝蒙皮板对复合板变形量的影响,为减小温度变形提供技术控制措施,对于将陶瓷薄板-铝蜂窝复合板广泛应用于幕墙面板装饰有一定的借鉴与参考作用。

可调双曲装饰板在金属屋面中的应用

金属屋面因具有结构简单、重量轻、施工便捷、产业化程度高、使用寿命长等特点,故被广泛使用于建筑业。但随着结构造型的多样性以及金属结构易变形等特点,容易导致金属屋面系统出现漏水现象,同时在金属屋面上固定具有装饰效果的蜂窝铝板或瓦结构,又会对金属屋面系统产生一定影响。研究总结了圆形金属屋面防水技术,通过可调连接件固定蜂窝铝板实现单曲面蜂窝铝板达到双曲面造型的施工技术,因此,工程具有可观的经济效益和社会效益,以期为类似工程中具有实际的推广意义。

蜂窝状ZSM-5沸石协同低温等离子体净化含硫恶臭气体

采用蜂窝状ZSM-5沸石协同低温等离子体净化5种典型含硫恶臭气体,通过沸石硅铝比、锰改性、放电电压参数的优化探究最佳工艺参数与处理效果。结果表明:降低硅铝比、锰改性利于提升蜂窝状ZSM-5沸石对含硫恶臭气体的整体吸附效率,增大硅铝比、适当增加锰负载量、提高放电电压则利于提升蜂窝状ZSM-5沸石协同低温等离子体对含硫恶臭气体的去除效率,其提升机制可能与沸石比表面积、外表面积和Mn^(3+)负载催化有关。在硅铝比为70(摩尔比)、锰负载量为10%(质量分数)、7.5 kV的条件下,锰改性蜂窝状ZSM-5沸石协同低温等离子体对含硫恶臭气体的去除效率均大于95%,比输入能量仅为2.3 J/L。

公共建筑大空间吊顶施工质量管理要点

针对大型公共建筑通常采用的特色各异复杂几何造型大空间吊顶效果呈现困难、质量管控难的特点,以杭州萧山国际机场出发层双曲蜂窝铝板吊顶为例,从前期深化设计阶段、中期采购加工阶段和现场安装阶段等各自侧重的施工管理要点进行剖析总结和实践,完美实现了设计意图,为同类项目提供参考。

蜂窝铝箔产业化应用研究

通过研究热轧、连续铸轧和连铸连轧加工铝板带坯料的特点,介绍了3003合金蜂窝铝箔生产工艺及控制要点。结果表明,连铸连轧3003合金3.5 mm蜂窝箔坯料,不仅可以减少2个压延道次,而且通过工艺参数调整,可获得成品力学性能优良的蜂窝铝箔产品。

铝合金蜂窝吸能结构参数优化设计

基于铝合金蜂窝结构轴向平压试验和数值模拟,对不同结构参数的铝合金蜂窝结构吸能特性展开评估,通过对参数质量比吸能增率的引入,表明吸能增率与质量增率为一次线性关系。归纳得出铝合金蜂窝吸能结构参数优化设计的经验公式,经验证明,计算精度超过90%,可实现铝蜂窝吸能结构参数快速优化设计,为轻量化吸能结构的设计提供理论依据。

铝蜂窝夹芯结构抗爆性能仿真分析与优化

利用CONWEP计算模型对铝蜂窝夹芯结构的抗爆性能进行了有限元分析,以背板最大变形和夹芯层比吸能作为抗爆性能指标,根据不同基体材料的组合结构建立了铝蜂窝夹芯结构的基准模型.基于基准模型,定量研究了铝蜂窝夹芯结构各部分结构参数和蜂窝胞元类型对其抗爆性能的影响规律.结果表明面板材料采用Al2024T351,背板材料采用RHA的组合结构具有良好的抗爆性能;相比于背板厚度变化,面板厚度的变化对铝蜂窝夹芯结构抗爆性能指标的影响更显著.应用构建代理模型的方法对铝蜂窝夹芯结构的抗爆性能进行了多目标优化设计,使铝蜂窝夹芯结构的抗爆炸冲击波性能得到了明显改善,这对抗爆结构的工程设计有一定指导意义.

上海世博温室张弦铝合金网格结构体系研究与工程应用

以上海世博温室热带雨林馆(P3)为工程背景,结合温室建筑对结构通透性的需求,首先对平板型屋盖结构体系的设计难点进行分析,对结构体系方案进行比选及计算分析研究。采用小模量非线性有限元方法并结合边界条件对屋盖结构进行找形分析,构建张弦网格结构体系,进一步对比分析了张弦网格结构体系和蜂窝型空间网架结构的特点,分析结构体系的竖向和水平向抗力系统。结果表明两种结构体系均能满足结构刚度、稳定性及受力要求,都可有效解决多边形铝合金平板型结构面外刚度不足的难题,且对屋盖结构复杂边界的适应性好。结合项目建筑效果、加工和施工难度等综合考虑,本项目最终实施方案为张弦铝合金网格结构体系,可推广应用于自由曲线边界屋盖建筑中。

基于排气型气囊的多管火箭炮着陆缓冲特性研究

为研究排气型气囊作用下多管火箭炮在不同工况下的着陆冲击性能,建立多管火箭炮着陆缓冲系统有限元模型,利用LS-DYNA软件计算了炮车系统在刚性地面条件、土壤地面条件、蜂窝铝辅助缓冲条件、后排气囊失效的恶劣工况下的着陆过程动力学响应。结果表明,不同地面条件对多管火箭炮着陆缓冲性能影响较小,车架、框架、定向管应力超过许用应力,应注意防护;在货台和车身之间设计蜂窝铝辅助缓冲装置能有效降低车架应力,实现对车架的保护;后排气囊失效情况下货台冲击过载从40 g提高到80g,超出空投安全标准,安全隐患增加。该文研究结果对于多管火箭炮空投方案设计和试验验证有一定参考意义。

铝蜂窝夹芯板低速动态冲击响应研究

为研究不同结构参数对质量相同、强度不同的两种铝蜂窝夹芯板低速动态冲击响应的影响,建立了铝蜂窝夹芯板受半球型落锤低速冲击的数值模型,并将有限元计算结果与试验结果进行对比,检验了模型的可靠性。在此基础上,对比研究了不同上下铝板厚度和不同蜂窝芯壁厚对两种铝蜂窝夹芯板在低速冲击下吸能效果的影响。结果表明:在质量相同的情况下,强度小、高度大的夹芯板在低速冲击下力-位移曲线更易出现双峰模式,增加蜂窝芯壁厚或是上下铝板厚度都会使第一次的峰值力增加,第二次峰值力降低;强度小、高度大的夹芯板蜂窝芯在低速冲击中吸能占比更多,强度大、高度小的则是上层铝板吸收的能量更多,前者的质量、体积比吸能更高;铝蜂窝夹芯板质量比吸能和体积比吸能与壁厚边长比、板厚芯高比均呈幂次关系。