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< Page ,Total 36 >
3D printing fabrication of porous bismuth antimony telluride and study of the thermoelectric properties EI
期刊论文 | 2019 , 37 , 370-375 | Journal of Manufacturing Processes
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Abstract :

This paper reports the successful preparation of porous thermoelectric samples of bismuth antimony telluride (Bi0.5Sb1.5Te3, BST) using 3D printing technology. The porous thermoelectric samples were fabricated with selective laser sintering (SLS) method using 100 mesh BST powders. Their thermoelectric performances, including electrical conductivity, Seebeck coefficient, and thermal conductivity in the temperature range of 25℃ - 250℃ were measured. The electrical conductivity was found to have a maximum value 4.03 × 104 S/m, lower than maximum value 7.36 × 104 S/m of the bulk BST. The Seebeck coefficient of the porous samples was found have a maximum value at 190.51 μV/K, slightly higher than that of the BST bulk alloy. The minimum thermal conductivity of the porous BST samples was measured to be 0.27 W/mK at 54℃, less than 18% of minimum that for the bulk BST alloy. The thermal conductivity is reduced due to boundaries and defects formed in SLS process as well as the porous structures of the samples. The figure of merit (ZT) of the porous samples was found to have a maximum value of about 1.29, higher than that of the BST bulk material. © 2018 The Society of Manufacturing Engineers

Keyword :

3-D printing Bismuth antimony telluride Porous thermoelectric Selective laser sintering Thermoelectric

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GB/T 7714 Shi, Jianxu , Chen, Hualing , Jia, Shuhai et al. 3D printing fabrication of porous bismuth antimony telluride and study of the thermoelectric properties [J]. | Journal of Manufacturing Processes , 2019 , 37 : 370-375 .
MLA Shi, Jianxu et al. "3D printing fabrication of porous bismuth antimony telluride and study of the thermoelectric properties" . | Journal of Manufacturing Processes 37 (2019) : 370-375 .
APA Shi, Jianxu , Chen, Hualing , Jia, Shuhai , Wang, Wanjun . 3D printing fabrication of porous bismuth antimony telluride and study of the thermoelectric properties . | Journal of Manufacturing Processes , 2019 , 37 , 370-375 .
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Ionic polymer pressure sensor with gradient shape based on ion migration SCIE
期刊论文 | 2019 , 125 (2) | JOURNAL OF APPLIED PHYSICS
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Abstract :

Inspired by the sensing mechanism of an ionic polymer-metal composite (IPMC) strip, in which an electrical response is induced by an elastic stress gradient across the strip's thickness, we propose a new ionic polymer pressure sensor with a gradient shape that is based on ion migration. Under an applied pressure, an elastic stress gradient is generated across the top and bottom surfaces of the gradient, which then causes cations to migrate toward the lower pressure side. This cation redistribution then generates an electrical response. To verify this concept, a millimeter-scale ionic pressure sensor based on Nafion was fabricated by a casting method. The voltage responses of this sensor were measured using a self-made test setup. The maximum response approached tens of millivolts, which was much greater than that of an IPMC bending sensor. The sensing voltage was also investigated with respect to the various area ratios between the top and bottom surfaces and the various sensor heights. The sensitivity initially increases with increasing area ratio and then tends to reach a saturation state, whereas it rarely changed with variations in the height. Finally, the mechanical analysis showed that the size effects on the sensitivity could be explained qualitatively by the stress difference that occurs between the top and bottom surfaces. Published under license by AIP Publishing.

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GB/T 7714 Zhu, Zicai , He, Ximing , He, Qingsong et al. Ionic polymer pressure sensor with gradient shape based on ion migration [J]. | JOURNAL OF APPLIED PHYSICS , 2019 , 125 (2) .
MLA Zhu, Zicai et al. "Ionic polymer pressure sensor with gradient shape based on ion migration" . | JOURNAL OF APPLIED PHYSICS 125 . 2 (2019) .
APA Zhu, Zicai , He, Ximing , He, Qingsong , Fang, Xiaoyong , Hu, Qiao , Chen, Hualing . Ionic polymer pressure sensor with gradient shape based on ion migration . | JOURNAL OF APPLIED PHYSICS , 2019 , 125 (2) .
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Rapid deformation of IPMC under a high electrical pulse stimulus inspired by action potential SCIE
期刊论文 | 2019 , 28 (1) | SMART MATERIALS AND STRUCTURES
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Abstract :

Slow deformation seriously restrains application development of IPMC actuator, especially for thick and ionic liquid-based IPMC. Inspired by the action potential of muscle cell, this letter proposes a concept of high electrical pulse stimulus to accelerate IPMC deformation. By analyzing the dynamic process of voltage drop at the electrode-polymer interface, high voltage pulse is proved theoretically to be safe for IPMC in a short time. After charging the electrical double layer at the interface, the voltage pulse should be reduced to a safe level before electrochemical reactions. In our experiments, applying various high voltage pulses to a thick IPMC, the deformation can be sped up a few hundred times at most without any electrolysis damage. The results strongly support the practicability of the impulsive driving method.

Keyword :

action potential rapid deformation electrical pulse stimulus ionic polymer-metal composites

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GB/T 7714 Zhu, Zicai , Bian, Changsheng , Ru, Jie et al. Rapid deformation of IPMC under a high electrical pulse stimulus inspired by action potential [J]. | SMART MATERIALS AND STRUCTURES , 2019 , 28 (1) .
MLA Zhu, Zicai et al. "Rapid deformation of IPMC under a high electrical pulse stimulus inspired by action potential" . | SMART MATERIALS AND STRUCTURES 28 . 1 (2019) .
APA Zhu, Zicai , Bian, Changsheng , Ru, Jie , Bai, Wanfa , Chen, Hualing . Rapid deformation of IPMC under a high electrical pulse stimulus inspired by action potential . | SMART MATERIALS AND STRUCTURES , 2019 , 28 (1) .
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4D Printing: Progress in Additive Manufacturing Technology of Smart Materials and Structure EI Scopus CSCD PKU
期刊论文 | 2018 , 52 (2) , 1-12 | Hsi-An Chiao Tung Ta Hsueh/Journal of Xi'an Jiaotong University
SCOPUS Cited Count: 2
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Abstract :

4D printing technology is proposed based on 3D printing technology of smart materials and structure. 4D printed entities can be changed with the external environment. The method of additive manufacturing and driving effect of materials, such as shape memory alloys, shape memory polymers, piezoelectric materials, electroactive polymers, light driven polymer and water drive structure, are compared and it is concluded that direct writing printing has the characteristics of wide applicability, while driving performance of a single smart material is limited. Multi-material additive manufacturing can combine many kinds of smart materials with many kinds of drive mode and overcome the shortage of single smart material and structure. The literature review shows that 4D printing research is still in the laboratory stage, it is also required to broaden the intelligent materials, develop the printing software, explore the printing process, investigate the methods for soft materials and solve the problems in intelligent material compatibility, in order that 4D printing can be widely used in medicine, military, aerospace and other fields. © 2018, Editorial Office of Journal of Xi'an Jiaotong University. All right reserved.

Keyword :

Additive manufacturing technology Driving method Driving performance Electro-active polymers Material compatibility Printing process Smart material and structure Smart materials and structures

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GB/T 7714 Chen, Hualing , Luo, Bin , Zhu, Zicai et al. 4D Printing: Progress in Additive Manufacturing Technology of Smart Materials and Structure [J]. | Hsi-An Chiao Tung Ta Hsueh/Journal of Xi'an Jiaotong University , 2018 , 52 (2) : 1-12 .
MLA Chen, Hualing et al. "4D Printing: Progress in Additive Manufacturing Technology of Smart Materials and Structure" . | Hsi-An Chiao Tung Ta Hsueh/Journal of Xi'an Jiaotong University 52 . 2 (2018) : 1-12 .
APA Chen, Hualing , Luo, Bin , Zhu, Zicai , Li, Bo . 4D Printing: Progress in Additive Manufacturing Technology of Smart Materials and Structure . | Hsi-An Chiao Tung Ta Hsueh/Journal of Xi'an Jiaotong University , 2018 , 52 (2) , 1-12 .
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Additive Manufacturing Based on Light Driven Soft Structure EI Scopus CSCD PKU
期刊论文 | 2018 , 52 (8) , 54-59 | Hsi-An Chiao Tung Ta Hsueh/Journal of Xi'an Jiaotong University
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Abstract :

For the disadvantages of light-driven materials used in soft robots, such as simple structure, complex forming process, and poor performance stability, we apply the additive manufacturing technology to the manufacture of light-driven materials and structures, and develop a method for the additive manufacturing process of polydimethylsiloxane (PDMS) and carbon nanotube (CNT) double-layer composites. The process testing shows that when the injection pump flow is 0.05 mL/min, the head moving speed is 30 mm/s and the print head diameter is 0.3 mm, the printed PDMS plane has the better flatness; when the injection pump flow is 0.4 mL/min, the nozzle moving speed is 33 mm/s and the diameter of the head is 0.4 mm, the printed CNT single-track forming track is more continuous and uniform, and the printed plane is flat; and as the printed PDMS layer thickness or the CNT layer thickness increase, the response speed of the optical drive in the two-layer structure gradually lowers. Via the additive manufacturing technology, a soft robot hand is printed. It can simulate pinching, grasping, and gripping of human hands under light, demonstrating the feasibility of the additive manufacturing process for light-driven materials. © 2018, Editorial Office of Journal of Xi'an Jiaotong University. All right reserved.

Keyword :

Additive manufacturing process Additive manufacturing technology Light driven Polydimethylsiloxane PDMS Printing process Simple structures Soft robot Two-layer structures

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GB/T 7714 Xu, Xuejie , Luo, Bin , Chen, Hualing . Additive Manufacturing Based on Light Driven Soft Structure [J]. | Hsi-An Chiao Tung Ta Hsueh/Journal of Xi'an Jiaotong University , 2018 , 52 (8) : 54-59 .
MLA Xu, Xuejie et al. "Additive Manufacturing Based on Light Driven Soft Structure" . | Hsi-An Chiao Tung Ta Hsueh/Journal of Xi'an Jiaotong University 52 . 8 (2018) : 54-59 .
APA Xu, Xuejie , Luo, Bin , Chen, Hualing . Additive Manufacturing Based on Light Driven Soft Structure . | Hsi-An Chiao Tung Ta Hsueh/Journal of Xi'an Jiaotong University , 2018 , 52 (8) , 54-59 .
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U-turning an agile robotic cube by a soft dielectric elastomer resonator EI Scopus
会议论文 | 2018 , 333-338 | 1st IEEE International Conference on Soft Robotics, RoboSoft 2018
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Small robot is favorable in diverse application. Dielectric elastomer is soft active material, offering new insight in robotic actuation. This paper describes a lightweight robotic cube driven by a dielectric elastomer resonator (DER). The vibration performance of the DER is experimentally studied and characterized for a fast speed actuation in robotic cube. This robotic cube has an excellent athletic ability. Firstly, without wheel, leg or track, it can locomote rectilinearly at the first mode resonance frequency of DER, with the speed of 0.78 body length per second. Secondly, the robotic cube can change its direction (U-turn) at the second mode resonance frequency of DER. The robotic cube favors simplicity in manufacture and multi-mode locomotion integration controlled by a single actuator at its voltage change. © 2018 IEEE.

Keyword :

Active material Agile robotics Athletic abilities Dielectric elastomers Diverse applications Light-weight robotics Resonance frequencies Single actuators

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GB/T 7714 Tang, Chao , Li, Bo , Chen, Hualing . U-turning an agile robotic cube by a soft dielectric elastomer resonator [C] . 2018 : 333-338 .
MLA Tang, Chao et al. "U-turning an agile robotic cube by a soft dielectric elastomer resonator" . (2018) : 333-338 .
APA Tang, Chao , Li, Bo , Chen, Hualing . U-turning an agile robotic cube by a soft dielectric elastomer resonator . (2018) : 333-338 .
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Research Progress in Tunable Surface Morphology in Soft Materials and Applications EI Scopus CSCD PKU
期刊论文 | 2018 , 46 (3) , 131-141 | Cailiao Gongcheng/Journal of Materials Engineering
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Abstract :

The special functions of surface morphology in nature have attracted many scholars' interest, and the control of soft-rigid composites has become a hotspot in recent years. The common soft material surface morphological formation methods, including pre-stretched method, heat treating method and swelling method, were introduced in this paper and a way for the generation of surface morphology was provided. The application of surface morphology in engineering including fluid dynamics, optics, and other fields were introduced, and some ideas for reference in wide engineering application were provided. On the basis of this, the development trend of the active control and generation method of the surface morphology was prospected. © 2018, Journal of Materials Engineering. All right reserved.

Keyword :

Development trends Engineering applications Formation method Generation method Heat treating methods Rigid composites Soft material Special functions

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GB/T 7714 Tang, Chao , Chen, Hua-Ling , Li, Bo et al. Research Progress in Tunable Surface Morphology in Soft Materials and Applications [J]. | Cailiao Gongcheng/Journal of Materials Engineering , 2018 , 46 (3) : 131-141 .
MLA Tang, Chao et al. "Research Progress in Tunable Surface Morphology in Soft Materials and Applications" . | Cailiao Gongcheng/Journal of Materials Engineering 46 . 3 (2018) : 131-141 .
APA Tang, Chao , Chen, Hua-Ling , Li, Bo , Liu, Xue-Jing . Research Progress in Tunable Surface Morphology in Soft Materials and Applications . | Cailiao Gongcheng/Journal of Materials Engineering , 2018 , 46 (3) , 131-141 .
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数控铣床铣刀磨破损监测技术研究
期刊论文 | 2018 , (3) , 1-4,8 | 机械研究与应用
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Abstract :

针对目前缺少铣刀磨损量建模研究的现状,通过搭建铣刀磨破损监测信号采集实验系统,对铣刀的磨破损进行全寿命的切削加工实验,采集了铣刀在加工中的加速度、切削力和声发射信号并对采集的信号进行时域、频域和时频域特征指标的提取,分析和评估了各特征指标对铣刀磨破损分类的敏感程度,筛选出适用于铣刀磨破损建模的特征向量.利用支持向量机分类算法建立了铣刀磨破损的分类模型,同时引入了粒子群算法对模型的参数进行优化.

Keyword :

铣刀磨损 粒子群算法 建模 支持向量机

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GB/T 7714 徐晓亮 , 魏东 , 汪骏飞 et al. 数控铣床铣刀磨破损监测技术研究 [J]. | 机械研究与应用 , 2018 , (3) : 1-4,8 .
MLA 徐晓亮 et al. "数控铣床铣刀磨破损监测技术研究" . | 机械研究与应用 3 (2018) : 1-4,8 .
APA 徐晓亮 , 魏东 , 汪骏飞 , 王永泉 , 陈花玲 . 数控铣床铣刀磨破损监测技术研究 . | 机械研究与应用 , 2018 , (3) , 1-4,8 .
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Research on 3D Printing Process of Ionic Gel EI
期刊论文 | 2018 , 54 (17) , 157-164 | Jixie Gongcheng Xuebao/Journal of Mechanical Engineering
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3D printing technique is applied to electro-active polymer material- ionic gel. Solution configuration method is employed in hot pressing process for preparing ionic gel. The characteristic size distribution of the ionic gel core layer and electrode layer after the single line and line assembly experiments are studied under combinations of parameters such as flow rate and scanning speed. The experimental results show that the extrusion flow rate and the scanning speed influence the width of the fiber width, and then influence the single layer quality of fiber spelled surface. On the basis of the optimum process parameters and layer thickness, an ionic cylindrical ring structure with thickness of 0.5 mm is printed by multi-layers. The force of about 500 mN is applied to the measurement point of the structure, and the voltage response of 0.35 mV can generate on the upper and lower surface of the structure. The sandwich structure of ionic gels is made by composite printing technology. The printed ionic gel specimens are driven by DC voltage of 3.5 V, and 1.5 mm deformation could generate within 18 s at the end of the specimen. The sensing and driving performance test results prove that the 3D printing process of ionic gels is feasible, which lays a foundation for subsequent complex manufacturing of materials and applications in soft robots. © 2018 Journal of Mechanical Engineering.

Keyword :

Characteristic size Complex manufacturing Driving properties Electro-active polymers Hot-pressing process Printing technologies Scanning speed Sensing performance

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GB/T 7714 Luo, Bin , Xia, Huachi , Chen, Hualing et al. Research on 3D Printing Process of Ionic Gel [J]. | Jixie Gongcheng Xuebao/Journal of Mechanical Engineering , 2018 , 54 (17) : 157-164 .
MLA Luo, Bin et al. "Research on 3D Printing Process of Ionic Gel" . | Jixie Gongcheng Xuebao/Journal of Mechanical Engineering 54 . 17 (2018) : 157-164 .
APA Luo, Bin , Xia, Huachi , Chen, Hualing , Zhu, Zicai , He, Ximing , Li, Dicheng . Research on 3D Printing Process of Ionic Gel . | Jixie Gongcheng Xuebao/Journal of Mechanical Engineering , 2018 , 54 (17) , 157-164 .
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Research on the Rigidity Adjustment Performance of Flexible Surgical Arm Based on Fiber-coated Pneumatic Structure EI
期刊论文 | 2018 , 54 (17) , 46-52 | Jixie Gongcheng Xuebao/Journal of Mechanical Engineering
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Abstract :

In view of the future development requirements of the minimally invasive surgical arm, a method using the principle of negative pressure to enhance the interactions between discrete structures is proposed to adjust the stiffness of flexible surgical arms. A pneumatic multilayered fiber braid structure is specially designed and fabricated, cladded on the outer surface of the tube arm. For this structure, negative pressure can be obtained in the interlayer of the sealed fiber filaments by a vacuum pump, and the extrusion pressure and friction force between them increase consequently, leading to a stiffness enhancement of the arm. A semi-analytical method for quantitatively evaluate the flexural stiffness of the large-deformed arm is then studied. Finally, the experimental investigations are performed, focused on the influences of some key parameters on the stiffness adjustment effect of the arm, such as vacuum degree, the size of fiber filaments, the thickness of the packaging film, the cross section of the fiber layer, etc. © 2018 Journal of Mechanical Engineering.

Keyword :

Discrete structure Experimental investigations Flexible surgical arm Minimally invasive surgical Negative pressures Semi-analytical methods Stiffness adjustments Stiffness enhancement

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GB/T 7714 Xu, Xiaoliang , Wang, Yongquan , Wen, Kun et al. Research on the Rigidity Adjustment Performance of Flexible Surgical Arm Based on Fiber-coated Pneumatic Structure [J]. | Jixie Gongcheng Xuebao/Journal of Mechanical Engineering , 2018 , 54 (17) : 46-52 .
MLA Xu, Xiaoliang et al. "Research on the Rigidity Adjustment Performance of Flexible Surgical Arm Based on Fiber-coated Pneumatic Structure" . | Jixie Gongcheng Xuebao/Journal of Mechanical Engineering 54 . 17 (2018) : 46-52 .
APA Xu, Xiaoliang , Wang, Yongquan , Wen, Kun , Chen, Hualing , Wang, Shuxin , Li, Dichen . Research on the Rigidity Adjustment Performance of Flexible Surgical Arm Based on Fiber-coated Pneumatic Structure . | Jixie Gongcheng Xuebao/Journal of Mechanical Engineering , 2018 , 54 (17) , 46-52 .
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