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学者姓名：张伟
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Abstract ：
Sandwich structures and porous materials have been applied widely in various fields due to their excellent mechanical performance, and multifunctional composites will have a significant engineering demand in the future. Studying damped composites' mechanical properties and failure forms has significant engineering value and significance. However, the current connecting processes for sandwich panels and porous materials must be improved. Therefore, to explore the ambiguity of the connection interface between the core material and panel in sandwich panels, as well as the mechanical properties of such structures, a sandwich panel with a metal rubber core material was prepared using vacuum brazing and cementing processes. Microscopic examinations using scanning electron microscopy and energy-dispersive spectroscopy were conducted to observe the physical bonding mechanism at the interface of the sandwich panel. The results indicate that the brazed sandwich panels exhibited a more uniform and continuous interface than the cemented sandwich panels. This work designs three-point bending compression experiments to investigate the effects of core material thickness, density, and preparation process on the bending mechanical properties of the sandwich panel. Failure modes of the sandwich panel during the experiments are analyzed. The experimental results show that the failures of the brazed sandwich panels are attributable to the bending deformation of the panel and the shear failure of the metal wire core material. The cemented sandwich panels exhibit separation failures in the area below the indenter and at both ends of the panel. The core material's thickness and density significantly influence the bending performance of the sandwich panels. An increase in the core material's thickness and density effectively enhances the sandwich panels' peak load and energy absorption capacity.
Keyword ：
bending failure modes bending failure modes mechanical property mechanical property metal rubber metal rubber sandwich panel sandwich panel
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| GB/T 7714 | Zhang, Wei , Wang, Shanshan , Zheng, Xiaoyuan et al. Experimental Investigation of the Three-Point Bending Property of a Sandwich Panel with a Metal Rubber Core [J]. | METALS , 2024 , 14 (4) . |
| MLA | Zhang, Wei et al. "Experimental Investigation of the Three-Point Bending Property of a Sandwich Panel with a Metal Rubber Core" . | METALS 14 . 4 (2024) . |
| APA | Zhang, Wei , Wang, Shanshan , Zheng, Xiaoyuan , Xue, Xin . Experimental Investigation of the Three-Point Bending Property of a Sandwich Panel with a Metal Rubber Core . | METALS , 2024 , 14 (4) . |
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Abstract ：
An elastic-porous composite with Cu-steel bimetallic wire mesh was proposed to meet the requirements of damping, vibration reduction, and electrical conductivity of aerospace hardware equipment. Firstly, the samples with different weight ratios (Cu/steel) were prepared through special manufacturing processes: composite wire preparing, helical coil encircling, stretching with equal pitch, entangling in an interlocked pattern, and cold stamping. Secondly, the mechanical performances such as stiffness, loss factor, and tangent modulus were characterized by the static compression test. Thirdly, the sensitivity of electrical conductivity to the loading force was examined by mechanical-electrical coupling tests. Finally, the influence of the weight ratio (Cu/steel) on the mechanical and electrical properties was discussed. The results show that the Cu elements can generally improve the damping capacity and reduce the stiffness of the material. The resistance-force curves of specimens show obvious nonlinearity, and the resistance decreases with the increase of compression force. The conductivity of the materials increases with the increasing stiffness and weight ratio according to the resistance-stiffness curves. © 2021 Trans Tech Publications Ltd, Switzerland.
Keyword ：
Composite materials Composite materials Compression testing Compression testing Damping Damping Electric conductivity Electric conductivity Mesh generation Mesh generation Stiffness Stiffness Wire Wire
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| GB/T 7714 | Xue, Xin , Zhang, Wei , Bai, Hongbai . Mechanical and electrical properties of elastic-porous composite with cu-steel bimetallic wire mesh [C] . 2021 : 863-869 . |
| MLA | Xue, Xin et al. "Mechanical and electrical properties of elastic-porous composite with cu-steel bimetallic wire mesh" . (2021) : 863-869 . |
| APA | Xue, Xin , Zhang, Wei , Bai, Hongbai . Mechanical and electrical properties of elastic-porous composite with cu-steel bimetallic wire mesh . (2021) : 863-869 . |
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Abstract ：
Cu-steel bimetallic porous composite structures can be used as lightweight, damping, and electro-conductive elements in critical environments where traditional single materials become ineffective. In the present work, a novel Cu-steel bimetallic porous composite with a double-helix entangled structure was developed. The mechanical properties (static stiffness, loss factor, and tangent modulus) of the as-synthesized composite were characterized by compressive tests, and its electrical sensitivity to compressive force was examined by mechanical-electrical coupling tests. The effect of the copper/steel weight ratio on mechanical and electrical performances was analyzed in detail. It is found that the Cu-steel bimetallic porous composite with a relatively high weight ratio has a larger average loss factor and lower stiffness than that with a low weight ratio. The structural characteristics and complex microstructural changes of the deformed specimen allow the tangent modulus and stiffness to exhibit a non-proportional relationship with the weight ratio over a range of displacement. The resistance-force curves exhibit an obvious nonlinearity and degradation due to the contact between internal bimetallic wires. The resistance-stiffness history reveals that the mitigation of electrical conductivity continued with the enlargement of stiffness and weight ratio.
Keyword ：
Bimetallic porous composite Bimetallic porous composite Double-helix entangled structure Double-helix entangled structure Electrical performance Electrical performance Mechanical property Mechanical property Weight ratio Weight ratio
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| GB/T 7714 | Zhang, Wei , Xue, Xin , Bai, Hongbai . Mechanical and electrical properties of Cu-Steel bimetallic porous composite with a double-helix entangled structure [J]. | COMPOSITE STRUCTURES , 2021 , 255 . |
| MLA | Zhang, Wei et al. "Mechanical and electrical properties of Cu-Steel bimetallic porous composite with a double-helix entangled structure" . | COMPOSITE STRUCTURES 255 (2021) . |
| APA | Zhang, Wei , Xue, Xin , Bai, Hongbai . Mechanical and electrical properties of Cu-Steel bimetallic porous composite with a double-helix entangled structure . | COMPOSITE STRUCTURES , 2021 , 255 . |
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Abstract ：
采用变结构离散指数趋近律设计出有效的控制律，通过控制张紧臂的状态，从而抑制轮带的横向振动。运用BP神经网络自适应调整控制律的参数，抑制了系统抖振问题。仿真结果表明，基于BP神经网络离散指数趋近律的滑模控制律有效抑制了轮带的横向振动和系统在滑模面的抖振。
Keyword ：
BP神经网络 BP神经网络 变结构控制 变结构控制 离散指数趋近律 离散指数趋近律 轴向运动弦线 轴向运动弦线
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| GB/T 7714 | 程翔 , 张伟 . 基于BP神经网络的轮带系统的变结构控制 [J]. | 机械制造与自动化 , 2015 , (5) : 176-179 . |
| MLA | 程翔 et al. "基于BP神经网络的轮带系统的变结构控制" . | 机械制造与自动化 5 (2015) : 176-179 . |
| APA | 程翔 , 张伟 . 基于BP神经网络的轮带系统的变结构控制 . | 机械制造与自动化 , 2015 , (5) , 176-179 . |
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Abstract ：
首先运用鲁棒控制理论中状态反馈的H∞控制，对轮带系统作动器的角位移和角速度进行调控，实现了对轴向运动皮带横向振动的位移和角速度的控制。然后运用MATLAB进行仿真，对该控制方法的有效性进行了验证。结果表明，该方法解决了轴向运动弦线横向振动系统的不确定系统鲁棒镇定控制器的设计难题，保证了控制器的有效性、可靠性和实用性。
Keyword ：
H∞ 控制 H∞ 控制 数值仿真 数值仿真 横向振动 横向振动 状态反馈 状态反馈 轮带系统 轮带系统 轴向运动皮带 轴向运动皮带
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| GB/T 7714 | 李志军 , 张伟 . 轴向运动弦线横向振动状态反馈的 H∞控制 [J]. | 机械设计与制造工程 , 2015 , (1) : 57-61 . |
| MLA | 李志军 et al. "轴向运动弦线横向振动状态反馈的 H∞控制" . | 机械设计与制造工程 1 (2015) : 57-61 . |
| APA | 李志军 , 张伟 . 轴向运动弦线横向振动状态反馈的 H∞控制 . | 机械设计与制造工程 , 2015 , (1) , 57-61 . |
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Abstract ：
The balance of mixed production line is the key issue, which means to adjust the working load to make working hour equal to production TAKT as well as to average the working hour of each station. Firstly, the automobile piston mixed production line system was analyzed by eM-Plant, which was carried out by object-oriented modeling and process-oriented simulation. After evaluating the production line performance, including the utilization rate of equipment and worker, the bottlenecks of the mixed production line were indentified. Finally, the relative measures were put forward to solve it, which makes the enterprise obtains the ability of rapid response to market demands. © (2014) Trans Tech Publications, Switzerland.
Keyword ：
Automobile manufacture Automobile manufacture Materials Materials Mechanics Mechanics Optimization Optimization
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| GB/T 7714 | Lin, Zheng-Ying , Shi, Wei-Yuan , Zhang, Wei . Optimization of the automobile parts mixed production line based on EM-plant [C] . 2014 : 867-871 . |
| MLA | Lin, Zheng-Ying et al. "Optimization of the automobile parts mixed production line based on EM-plant" . (2014) : 867-871 . |
| APA | Lin, Zheng-Ying , Shi, Wei-Yuan , Zhang, Wei . Optimization of the automobile parts mixed production line based on EM-plant . (2014) : 867-871 . |
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The transverse vibration control of an axially moving string system coupling the moving of actuator was investigated. The dynamic equations of string and actuator were derived via Hamilton's principle, and the dynamic equation of the actuator contained the mass of the tensioner pulley. Then the Lyapunov method was employed to prove the boundedness of the transverse vibration of the uncontrolled string, designed the controlled law for reducing the transverse vibration of the controlled string, proved the exponentially stable of the controlled string. By numerical simulation, the transverse vibration displacement diagrams under initial disturbance were given, and the effectiveness of the controller was demonstrated.
Keyword ：
Actuator; Axially moving string; Lyapunov; Numerical simulation; Tensioner pulley; Transverse vibration control Actuator; Axially moving string; Lyapunov; Numerical simulation; Tensioner pulley; Transverse vibration control
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| GB/T 7714 | Yu, X. , Zhang, W. . Transverse vibration control of belt drive systems by Lyapunov method [J]. | Journal of Mechanical Strength , 2013 , 35 (1) : 001-006 . |
| MLA | Yu, X. et al. "Transverse vibration control of belt drive systems by Lyapunov method" . | Journal of Mechanical Strength 35 . 1 (2013) : 001-006 . |
| APA | Yu, X. , Zhang, W. . Transverse vibration control of belt drive systems by Lyapunov method . | Journal of Mechanical Strength , 2013 , 35 (1) , 001-006 . |
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研究轴向运动弦线和作动器组成的耦合系统的横向振动控制.利用Hamilton原理给出弦线和作动器的动力学方程,作动器的动力学方程中包含有张紧轮的质量.采用Lyapunov方法分析未控弦线的有界性,获得控制律,并证明受控弦线的指数稳定性.通过数值仿真,给出初始扰动下弦线的横向振动位移曲线,证实控制规律的有效性.
Keyword ：
Lyapunov Lyapunov 作动器 作动器 张紧轮 张紧轮 数值仿真 数值仿真 横向振动控制 横向振动控制 轴向运动弦线 轴向运动弦线
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| GB/T 7714 | 余小刚 , 张伟 . 轮带系统横向振动控制的Lyapunov方法 [J]. | 机械强度 , 2013 , 35 (1) : 1-6 . |
| MLA | 余小刚 et al. "轮带系统横向振动控制的Lyapunov方法" . | 机械强度 35 . 1 (2013) : 1-6 . |
| APA | 余小刚 , 张伟 . 轮带系统横向振动控制的Lyapunov方法 . | 机械强度 , 2013 , 35 (1) , 1-6 . |
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随着“卓越工程师教育培养计划”的实施和时代发展的需要,“理论力学”课程可以定位为既是各工程专业的技术基础课程,又是具备独当一面的应用型基础课程.文章面向卓越工程师的培养,提出围绕力学建模,数学建模、求解和分析,具体工程应用等3个方面能力的培养,重新审视本课程的知识体系和教学内容、教学手段、实践教学和工程型师资队伍建设等方面,并提出大胆革新的思考和谨慎实践推广的建议.
Keyword ：
"卓越计划" "卓越计划" 教学改革 教学改革 理论力学 理论力学 课程体系 课程体系
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| GB/T 7714 | 李明林 , 杨晓翔 , 谢华 et al. 面向“卓越计划”的理论力学教学改革的思考 [J]. | 高等理科教育 , 2013 , (1) : 117-121 . |
| MLA | 李明林 et al. "面向“卓越计划”的理论力学教学改革的思考" . | 高等理科教育 1 (2013) : 117-121 . |
| APA | 李明林 , 杨晓翔 , 谢华 , 张伟 , 洪玫 . 面向“卓越计划”的理论力学教学改革的思考 . | 高等理科教育 , 2013 , (1) , 117-121 . |
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Abstract ：
运用变结构控制理论,采用指数趋近律对张紧臂的角位移进行控制,从而达到控制轴向运动弦线横向振动的目的.利用Matlab进行数值仿真,验证了所提控制力的有效性.
Keyword ：
作动器 作动器 变结构控制 变结构控制 数值仿真 数值仿真 横向振动 横向振动 轴向运动弦线 轴向运动弦线
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| GB/T 7714 | 余小刚 , 张伟 . 轴向运动弦线横向振动的变结构控制 [J]. | 福州大学学报（自然科学版） , 2012 , 40 (2) : 217-221 . |
| MLA | 余小刚 et al. "轴向运动弦线横向振动的变结构控制" . | 福州大学学报（自然科学版） 40 . 2 (2012) : 217-221 . |
| APA | 余小刚 , 张伟 . 轴向运动弦线横向振动的变结构控制 . | 福州大学学报（自然科学版） , 2012 , 40 (2) , 217-221 . |
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