Numerical study on anti-impact characteristics of energy absorbing column with multicellular square tube filled with aluminum foam [PDF]
, 2023 Aiming at the insufficient anti-impact performance of existing components of the energy-absorbing anti-impact support, a foam aluminum filled multicellular square tube structure is proposed.
Heng ZHU +5 more
core +1 more source
Experimental study on energy dissipation and failure characteristics of rock at depth under non-hydrostatic pressure condition [PDF]
, 2023 Deep buried rock is often in a non-hydrostatic initial ground stress field, and the different stress states lead to different rock response under dynamic loading.
Jun CHEN +4 more
core +1 more source
Kongjian kexue xuebao, 2023 核爆炸的大部分能量是以X射线形式释放的，研究X射线辐射特性对于天基核爆事件监测，当量反演都具有一定参考价值。根据核爆炸X射线能谱特性，构建了黑体辐射模型；根据NRLMSIS大气模型成分数据和高度密度数据，构建大气分层数值模型，并结合NIST数据库，构建分层大气质量吸收系数模型，提高了大气模型与大气质量吸收系数模型准确度。使用数值模拟程序对X射线在大气中的传输特性进行研究，模拟在临近空间高度核爆炸产生的X射线经过大气吸收后的能谱特性以及不同海拔高度点位的能注量。结果表明，在检测点高度恒定的情况下 ...
吕 致辉 +4 more
doaj +1 more source
Constitutive model and dynamic deformation behavior of 800 MPa grade cold-rolled dual phase steel [PDF]
, 2016 The Hopkinson experiment system was used to do the dynamic tensile experiment of 800 MPa grade cold rolled dual phase steel (DP800). The strain rate was determined as 500, 1000 and 2250 s-1 By comparing the experimental results, both the yield strength ...
CAI Heng-jun +3 more
core +1 more source
Influence of pore structure features on the high temperature tensile strength of coke [PDF]
, 2016 Through measuring the pore structure features of coke reacted with H2O or CO2 using a mercury porosimeter,the influence of average pore size,specific surface area and pore size distribution on the high temperature tensile strength of coke were studied in
GUO Wen-tao +5 more
core +1 more source
Dianci bileiqi, 2022 特高压直流输电工程中,避雷器组在限制过电压过程中要吸收大量的能量,部分位置避雷器组的吸收能量设计容量达到30 MJ,需要大量电阻片组成上百柱并联进行分流,随之出现了部分电阻片老化较快率先损坏导致避雷器组故障的问题。为提升大规模多柱并联避雷器组运行可靠性,提出了基于避雷器组中各电阻片吸收能量均衡的配组算法。首先探讨了ZnO电阻片伏安特性分散性机理及统计规律,提出了配组算法流程,并根据实际避雷器组案例进行模拟计算。结果显示,经过迭代计算配组后的避雷器组在限制过电压过程中吸收能量分布更加均衡 ...
刘志远 +6 more
doaj
Evaluation on crashworthiness and energy absorption of composite light airplane [PDF]
[[abstract]]The main aim of this study was to explore the safety differences when using aluminum alloy and three different fiber reinforced composites as material for the cockpit and fuselage of light aircraft under crash landing.
Pu-Woei Chen
core +1 more source
Research of Image Acquisition and Data Management System in Tooth Cleaning Laser Machine [PDF]
, 2006 随着生活水平的提高，口腔健康教育宣传的开展，越来越多的人意识到洁牙的重要性。目前，临床上大多数医院采用超声波洁牙，但它工作时所发出刺耳的声音，会给患者造成一种心理上的恐惧感。激光清洗技术作为一项新兴清洗技术，已成为传统清洗方法的补充和延伸，因其固有的优点，而在工农业生产、科研、医疗、国防建设等方面得到广泛的应用，激光洁牙设备将成为现代牙科必不可少的工具。与超声波洁牙等技术相比，激光洁牙属于非机械接触，不存在超声波洁牙所具有的振动噪声，不易损伤牙齿表面釉质，不损伤周边组织。按现有的牙科医疗器械 ...
陈春华
core +3 more sources
Dianci bileiqi, 2021 110 kV并联电容器装置具有单组容量大、电压等级高的特点,而其结构形式和运行工况又与传统并联电容器装置有所区别,因此研究其避雷器参数合理选取原则对于提高其经济性和安全可靠性具有重要意义。以特高压工程110 kV/240 MVA并联电容器装置为研究对象,对其正常分闸重击穿以及单相接地故障情况下单相重击穿时出现的过电压水平进行了理论分析,并在此基础上建立了避雷器吸收能量仿真模型,仿真分析了各种重击穿情况下避雷器的吸收能量以及运行工况对避雷系吸收能量的影响规律,最终提出了最严重工况下避雷器吸收能量的选取建议:
何慧雯, 尹婷, 马跃, 王子建
doaj
Experimental study on dynamic response and residual compressive strength of composite sandwich panel with PVC foam core under single-point low-velocity impact [PDF]
ObjectivesIn this paper, an orthogonal braided glass fiber composite sandwich panel with a PVC foam core and dimensions of 150 mm×100 mm×26 mm is selected as the research object in order to study the impact mechanical properties of composite sandwich ...
Chongyi CHEN +6 more
core +1 more source