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Quasi-static and low-velocity impact mechanical behaviors of entangled porous metallic wire material under different temperatures

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Defence Technology（防务技术） 2023年第1期19卷 143-152页

作者： Yi-wan Wu Hu Cheng Shang-zhou Li Yu Tang hong-bai bai Chun-hong Lu Engineering Research Center for Metal Rubber School of Mechanical Engineering and AutomationFuzhou UniversityFuzhou350116China Department of Automotive Engineering Hebei College of Industry and TechnologyShijiazhuang050091China

To improve the defense capability of military equipment under extreme conditions,impact-resistant and high-energy-consuming materials have to be *** damping characteristic of entangled porous metallic wire materials(EPMWM)for vibration isolation was previously *** this paper,a study focusing on the impact-resistance of EPMWM with the consideration of ambient temperature is *** quasi-static and low-velocity impact mechanical behavior of EPMWM under different temperatures(25℃-300℃)are systematically *** results of the static compression test show that the damping energy dissipation of EPMWM increases with temperature while the nonlinear damping characteristics are gradually *** the impact experiments,the impact energy loss rate of EPMWM was between 65%and 85%,while the temperatures increased from 25℃to 300℃.Moreover,under the same drop impact conditions,the overall deformation of EPMWM decreases in the temperature range of 100℃-200℃.On the other hand,the impact stiffness,energy dissipation,and impact loss factor of EPMWM significantly increase with *** can be attributed to an increase in temperature,which changes the thermal expansion coefficient and contact state of the internal wire ***,the energy dissipation mode(dry friction,air damping,and plastic deformation)of EPMWM is also ***,the EPMWM may act as a potential candidate material for superior energy absorption applications.

关键词： Entangled porous metallic wire material Low-velocity impact High temperature Energy dissipation characteristics Mechanical behavior

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Mechanical behavior of entangled metallic wire materials-polyurethane interpenetrating composites

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Defence Technology（防务技术） 2023年第2期20卷 120-136页

作者： Xiao-yuan Zheng Zhi-ying Ren hong-bai bai Zhang-bin Wu You-song Guo College of Mechanical Engineering and Automation Fuzhou UniversityFuzhou350116China Institute of Metal Rubber&Vibration Noise Fuzhou UniversityFuzhou350116China Gongbang Vibration Control Technology Co. LtdJiangsuJiangyin214431China

Composite materials exhibit the impressive mechanical properties of high damping and stiffness,which cannot be attained by employing conventional single *** these lines,a novel material architecture is presented in this work in order to fabricate composites with enhanced mechanical *** specifically,entangled metallic wire materials were used as the active matrix,whereas polyurethane was employed as the reinforcement *** a result,an entangled metallic wire material-polyurethane composite with high damping and stiffness was prepared by enforcing the vacuum infiltration *** top of that,the mechanical properties(loss factor,energy consumption,and average stiffness)of the proposed composite materials were characterized by performing dynamic tests,and its fatigue characteristics were verified by the micro-interface bonding,as well as the macro-damage *** impact of the density,preloading spacing,loading amplitude,and exciting frequency on the mechanical properties of the composites were also thoroughly *** extracted results indicate that the mechanical properties of the composites were significantly enhanced than those of the pure materials due to the introduction of interface ***,the average stiffness of the composites was about 10 times the respective value of the entangled metallic wire ***,a rise in the loading period leads to some failure between the composite interfaces,which reduces the stiffness property but enhances the damping dissipation ***,a comprehensive dynamic mechanical model of the composites was established,while it was experimentally *** proposed composites possess higher damping features,i.e.,stiffness characteristics,and maintain better fatigue characteristics,which can broaden the application range of the *** addition,we provide a theoretical and experimental framework for the research and applications in the field of metal ma

关键词： Entangled metallic wire material Composites materials Damping property Stiffness Fatigue characteristics

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Numerical and experimental evaluation for density-related thermal insulation capability of entangled porous metallic wire material

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Defence Technology（防务技术） 2023年第5期23卷 177-188页

作者： Tao Zhou Rong-zheng Fang Di Jia Pei Yang Zhi-ying Ren hong-bai bai 92578 Troops of the Chinese People's Liberation Army Beijing100055PR China School of Mechanical Engineering and Automation Fuzhou UniversityFuzhou350116PR China Institute of Metal Rubber&Vibration Noise Fuzhou UniversityFujianFuzhou350116PR China

Entangled porous metallic wire material(EPMWM)has the potential as a thermal insulation material in defence and *** order to optimize its thermophysical properties at the design stage,it is of great significance to reveal the thermal response mechanism of EPMWM based on its complex structural *** the present work,virtual manufacturing technology(VMT)was developed to restore the physics-based 3D model of *** this basis,the transient thermal analysis is carried out to explore the contact-relevant thermal behavior of EPMWM,and then the spiral unit containing unique structural information are further extracted and *** particular,the thermal resistance network is numerically constructed based on the spiral unit through the thermoelectric analogy method to accurately predict the effective thermal conductivity(ETC)of ***,the thermal diffusivity and specific heat of the samples were obtained by the laser thermal analyzer to calculate the ETC and thermal insulation factor of *** results show that the ETC of EPMWM increases with increasing temperature or reducing density under the experimental *** numerical prediction is consistent with the experimental result and the average error is less than 4%.

关键词： Entangled porous metallic wire material (EPMWM) Virtual manufacturing technology(VMT) Thermal resistance network Effective thermal conductivity(ETC) Thermal insulation factor

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Choice of approach for hepatectomy for hepatocellular carcinoma located in the caudate lobe:Isolated or combined lobectomy?

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World Journal of Gastroenterology 2012年第29期18卷 3904-3909页

作者： Peng Liu Bao-An Qiu Gang bai hong-Wei bai Nian-Xin Xia Ying-Xiang Yang Jian-Yong Zhu Yang An Bing Hu Department of Hepato-biliary Surgery anti Liver Transplantation Surgery Navy General Hospital Beijing 100048 China

AIM:To investigate the significance of the surgical approaches in the prognosis of hepatocellular carcinoma(HCC) located in the caudate lobe with a multivariate regression analysis using a Cox proportional hazard ***:Thirty-six patients with HCC underwent caudate lobectomy at a single tertiary referral center between January 1995 and June *** this series,left-sided,right-sided and bilateral approaches were *** outcomes of patients who underwent isolated caudate lobectomy or caudate lobectomy combined with an additional partial hepatectomy were *** survival curves of the isolated and combined resection groups were generated by the Kaplan-Meier method and compared by a log-rank ***:Sixteen(44.4%) of 36 patients underwent isolated total or partial caudate lobectomy whereas 20(55.6%) received a total or partial caudate lobectomy combined with an additional partial *** median diameter of the tumor was 6.7 cm(range,2.1-15.8 cm).Patients who underwent an isolated caudate lobectomy had significantly longer operative time(240 min vs 170 min),longer length of hospital stay(18 d vs 13 d) and more blood loss(780 mL vs 270 mL) than patients who underwent a combined caudate lobectomy(P < 0.05).There were no perioperative deaths in both groups of *** complication rate was higher in the patients who underwent an isolated caudate lobectomy than in those who underwent combined caudate lobectomy(31.3% vs 10.0%,P < 0.05).The 1-,3-and 5-year disease-free survival rates for the isolated caudate lobectomy and the combined caudate lobectomy groups were 54.5%,6.5% and 0% and 85.8%,37.6% and 0%,respectively(P < 0.05).The corresponding overall survival rates were 73.8%,18.5% and 0% and 93.1%,43.6% and 6.7%(P < 0.05).CONCLUSION:The caudate lobectomy combined with an additional partial hepatectomy is preferred because this approach is technically less demanding and offers an adequate surgical margin.

关键词： Hepatocellular carcinoma Hepatectomy Caudate lobectomy Caudate lobe Combined resection

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新型超低频非线性被动隔振系统的设计

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振动与冲击 2011年第1期30卷 234-236页

作者：路纯红白鸿柏军械工程学院石家庄050003

通过分析正负刚度并联隔振机理,设计了一种新型超低频被动隔振系统。该系统采用负刚度机构与正刚度弹簧并联,具有较高的支撑刚度和极低的运动刚度,且系统刚度呈现非线性,解决了传统被动隔振系统存在的超低频隔振难题。通过对该系统力学... 详细信息

通过分析正负刚度并联隔振机理,设计了一种新型超低频被动隔振系统。该系统采用负刚度机构与正刚度弹簧并联,具有较高的支撑刚度和极低的运动刚度,且系统刚度呈现非线性,解决了传统被动隔振系统存在的超低频隔振难题。通过对该系统力学特性进行分析,给出了系统刚度表达式及在平衡位置处的零刚度条件,为新型超低频非线性隔振器的设计提供了理论指导。

关键词：负刚度隔振系统非线性超低频

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复合作动器复合方式对平台主动隔振影响分析

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振动与冲击 2011年第8期30卷 253-257页

作者：陶帅白鸿柏顾伟 63956部队军械工程学院自行火炮教研室 73906部队51分队

为实现微隔振平台在较宽频带内的主动控制,将一弹性体和第三代压电致动器相串联,设计了一种复合式压电致动器。将复合致动器应用到微隔振平台,并对其整体建模、控制仿真时发现:弹性体相对于作动器位置不同时,在不同的外扰下对控制力的... 详细信息

为实现微隔振平台在较宽频带内的主动控制,将一弹性体和第三代压电致动器相串联,设计了一种复合式压电致动器。将复合致动器应用到微隔振平台,并对其整体建模、控制仿真时发现:弹性体相对于作动器位置不同时,在不同的外扰下对控制力的影响不同。为此,设计了一个针对不同外扰对控制力影响的评价函数,通过不同位置对评价函数影响的仿真,结果表明:当隔振平台系统受直接干扰时,弹性体位置对控制力的影响较大;当平台受地基扰动时,弹性体位置对控制力影响不显著。所以,复合作动器的布置形式取决于外扰的类型,且在实验室环境中,两种布置要达到相同的隔振效果,弹性体在上布置所耗费的能量小于其在下布置时的状态。

关键词：微隔振平台压电致动器弹性体

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一类非线性振动系统的响应计算方法

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振动与冲击 2008年第11期27卷 147-148,167页

作者：路纯红白鸿柏胡仁喜军械工程学院石家庄050003

研究了一类具有弹性非线性及阻尼非线性的振动系统在简谐激励下的响应计算方法。将等效线性化法与谐波平衡法相结合,求出了系统的近似解析响应。通过与采用数值积分求解结果进行对比分析,表明该方法编程简单、精度高,具有较好的工程实... 详细信息

研究了一类具有弹性非线性及阻尼非线性的振动系统在简谐激励下的响应计算方法。将等效线性化法与谐波平衡法相结合,求出了系统的近似解析响应。通过与采用数值积分求解结果进行对比分析,表明该方法编程简单、精度高,具有较好的工程实用性。

关键词：非线性振动系统响应计算等效线性化法谐波平衡法

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金属橡胶毛坯铺设路径规划

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航空动力学报 2016年第1期31卷 40-48页

作者：黄凯白鸿柏路纯红曹凤利军械工程学院车辆与电气工程系石家庄050003

针对金属橡胶毛坯铺设工艺,提出了以背景网格为基础的优化模型,利用遗传算法建立了定位销设计和路径规划的优化方法,为毛坯铺设提供了理论依据.定位销数量由底面背景网格非零网格数确定,定位销排布由遗传算法计算得到.根据定位销优化设... 详细信息

针对金属橡胶毛坯铺设工艺,提出了以背景网格为基础的优化模型,利用遗传算法建立了定位销设计和路径规划的优化方法,为毛坯铺设提供了理论依据.定位销数量由底面背景网格非零网格数确定,定位销排布由遗传算法计算得到.根据定位销优化设计结果,逐层对铺设路径进行规划,优化路径比经验路径所得毛坯更加均匀、密实,铺设层数越多,路径规划的优势越明显,铺设10层时,两毛坯目标函数b的值相差50%;单层路径数对毛坯的铺设质量影响不大;随着螺旋卷铺设长度的增加,不同单层路径数铺设的毛坯接触状态趋于一致.

关键词：金属橡胶毛坯铺设定位销路径规划组合优化遗传算法

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滑动摩擦系数随速度变化振子随机激励Krylov-Bogoliubov计算方法研究

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机械科学与技术 2001年第3期20卷 346-347页

作者：白鸿柏张培林黄协清军械工程学院兵器工程系石家庄050003 西安交通大学机械工程学院西安710049

研究了单自由度滑动摩擦系数随相对速度变化的干摩擦振动系统随机激励响应计算问题 ,提出了Krylov- Bogoliubov近似方法 ,并推导了相应的均方响应迭代方程。通过一个数值例分析。

关键词：非线性振动滑动摩擦系数库仑干摩擦模型响应计算近似计算

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主动隔振平台模态区间参数模型的独立模态控制方法

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振动工程学报 2011年第6期24卷 670-675页

作者：侯军芳李荣利白鸿柏北京特种车辆研究所北京100072 军械工程学院自行火炮教研室河北石家庄050003

针对六自由度隔振平台模态区间参数模型的控制器设计问题,提出了一种模态参数存在摄动时的独立模态控制设计方法,其中将振型矩阵存在不确定性时的模态位移变换转换为模态坐标下增广的等效模态位移测量噪声,在模态控制器设计时通过对噪... 详细信息

针对六自由度隔振平台模态区间参数模型的控制器设计问题,提出了一种模态参数存在摄动时的独立模态控制设计方法,其中将振型矩阵存在不确定性时的模态位移变换转换为模态坐标下增广的等效模态位移测量噪声,在模态控制器设计时通过对噪声的适当加权进行处理;将振型矩阵存在不确定性时的实际控制力变换等效为模态控制器设计时的控制输入矩阵的摄动。通过所提出的方法,将振型矩阵存在不确定性的模态控制器设计问题转换为输入矩阵存在摄动的新辅助系统的控制器设计,为模态参数区间模型的性能鲁棒控制器设计奠定了理论基础。对六自由度隔振平台进行了直接干扰和地基干扰下的主被动隔振实验,实验结果证实了所提方法的有效性。

关键词：模态参数区间振型摄动独立模态控制主动隔振平台

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