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< Page ,Total 28 >
Rapid and low-cost laser synthesis of hierarchically porous graphene materials as high-performance electrodes for supercapacitors EI SCIE
期刊论文 | 2019 , 54 (7) , 5658-5670 | Journal of Materials Science
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Abstract :

Development of 3D hierarchically porous graphene (HPG) with supercapacitor performances at low cost has remained a challenge in electrochemical devices. Recently, laser engraving technology has been proposed as a promising and very useful method to inscribe self-designed electrode array directly onto polymeric substrates by instantaneously converting the starting material into few-layer graphene. Here we show HPG fabrication on commercial bakelite resulting in porous graphene embedded in polymer surface using the high repetition nanosecond fiber laser engraving under nitrogen atmosphere. The results showed that the as-prepared HPG presents a combination of interconnected macro-, meso- and micropores with a multi-modal pore size distribution. The morphologies, microstructures and their properties of HPG films can be governed by the laser processing parameters. Moreover, the HPG-based supercapacitors show outstanding electrochemical performance with specific capacitance superior to other supercapacitors reported previously. The simple, rapid and low-cost approach proposed in this work has great potential in large-scale applications of electronic and energy storage devices. © 2018, Springer Science+Business Media, LLC, part of Springer Nature.

Keyword :

Electrochemical devices Electrochemical performance Hierarchically porous Large-scale applications Laser processing parameters Nitrogen atmospheres Polymeric substrate Specific capacitance

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GB/T 7714 Wang, Fangcheng , Mei, Xuesong , Wang, Kedian et al. Rapid and low-cost laser synthesis of hierarchically porous graphene materials as high-performance electrodes for supercapacitors [J]. | Journal of Materials Science , 2019 , 54 (7) : 5658-5670 .
MLA Wang, Fangcheng et al. "Rapid and low-cost laser synthesis of hierarchically porous graphene materials as high-performance electrodes for supercapacitors" . | Journal of Materials Science 54 . 7 (2019) : 5658-5670 .
APA Wang, Fangcheng , Mei, Xuesong , Wang, Kedian , Dong, Xia , Gao, Meng , Zhai, Zhaoyang et al. Rapid and low-cost laser synthesis of hierarchically porous graphene materials as high-performance electrodes for supercapacitors . | Journal of Materials Science , 2019 , 54 (7) , 5658-5670 .
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The Application of Multi-objective Genetic Algorithm in the Modeling of Thermal Error of NC Lathe EI Scopus
会议论文 | 2018 , 67 , 332-337 | 11th CIRP International Conference on Intelligent Computation in Manufacturing Engineering, CIRP ICME 2017
SCOPUS Cited Count: 1
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Abstract :

A modeling method based on multi-objective genetic algrithm (MOGA) for thermal error of NC lathe is proposed in this paper. Firstly, a coupling analysis method on component thermal deformation of the machine tool is used to determine the positions of equivalent temperature measurement points and establish a estimation model of thermal errors according to the physical characteristics of each component. Then one objective function is formulated based on this estimation model while the other one is determined by the testing data of the thermal error experiments. At last MO-GA is applied and a thermal error model with high robustness is obtained. © 2017 The Authors.

Keyword :

MOGA Multi-objective genetic algorithm NAGA-II NC lathe Objective functions Physical characteristics Thermal error Thermal error modeling

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GB/T 7714 Hou, Ruisheng , Yan, Zongzhuo , Du, Hongyang et al. The Application of Multi-objective Genetic Algorithm in the Modeling of Thermal Error of NC Lathe [C] . 2018 : 332-337 .
MLA Hou, Ruisheng et al. "The Application of Multi-objective Genetic Algorithm in the Modeling of Thermal Error of NC Lathe" . (2018) : 332-337 .
APA Hou, Ruisheng , Yan, Zongzhuo , Du, Hongyang , Chen, Tong , Tao, Tao , Mei, Xuesong . The Application of Multi-objective Genetic Algorithm in the Modeling of Thermal Error of NC Lathe . (2018) : 332-337 .
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Magneto-mechanical Behavior of Magnetic Shape Memory Alloy and Its Application in Hydraulic Valve Actuator EI
期刊论文 | 2018 , 54 (20) , 235-244 | Jixie Gongcheng Xuebao/Journal of Mechanical Engineering
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Abstract :

Magnetic shape memory alloy(MSMA) has recently emerged as a new type of multifunctional material exhibiting excellent performance as fast response and large strain. With a combination of the characteristics of ordinary smart materials and conventional shape memory alloy, it is qualified for high performance actuator. Constitution equations are derived based on the magnet-strain effect of MSMA, and temperature is introduced as an influential factor to modify the model. The present equations are improved to cover the shortage of inaccuracy in calculating the strain when the material is preloaded. Experiments are conducted to explore the magnetic field induced strain, and data are applied to establish nero-network based models to build the nonlinear relations between strain, stress and other related parameters. It is shown in the results that the energy density of MSMA is 70 kJ/m3 and energy conversion efficiency is 80%. Taking high speed on/off valve as an example, the characteristics of MSMA hydraulic valve actuator are considered. Valve design, magnetic field and fluid flow simulations are carried out. On analysis of dynamics of valve actuation system, the results show that the response frequency of the poppet valve system driven directly by MSMA can reach as high as 200 Hz, and the dynamic response time is nearly 5 ms. © 2018 Journal of Mechanical Engineering.

Keyword :

Dynamic performance High-speed on/off valve Hydraulic valves Magnetic field-induced strain Magnetic shape memory alloys Magneto-mechanical behavior Multi-functional materials Nonlinear relations

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GB/T 7714 Shi, Hu , He, Bin , Wang, Zheng et al. Magneto-mechanical Behavior of Magnetic Shape Memory Alloy and Its Application in Hydraulic Valve Actuator [J]. | Jixie Gongcheng Xuebao/Journal of Mechanical Engineering , 2018 , 54 (20) : 235-244 .
MLA Shi, Hu et al. "Magneto-mechanical Behavior of Magnetic Shape Memory Alloy and Its Application in Hydraulic Valve Actuator" . | Jixie Gongcheng Xuebao/Journal of Mechanical Engineering 54 . 20 (2018) : 235-244 .
APA Shi, Hu , He, Bin , Wang, Zheng , Mei, Xuesong . Magneto-mechanical Behavior of Magnetic Shape Memory Alloy and Its Application in Hydraulic Valve Actuator . | Jixie Gongcheng Xuebao/Journal of Mechanical Engineering , 2018 , 54 (20) , 235-244 .
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Design and Analysis of Mechanical-hydraulic Component to Harvest Energy from Human Walking EI
期刊论文 | 2018 , 54 (20) , 170-179 | Jixie Gongcheng Xuebao/Journal of Mechanical Engineering
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Abstract :

Considerable energy is generated by foot during human walking. Harvesting such energy is expected to solve the problem of energy supply for wearable electronic devices and even exoskeleton effectively. An energy recovery device is designed to achieve energy conversion into hydraulic power for the drive system of exoskeleton. In order to cover the shortage of the previous research without consideration of human walking dynamics, a 3 DOF dynamic model is established based on the gait analysis to formulate the single leg walking motion. The relationships between foot-ground interactions and time as well as foot attitude in a gait cycle are studied taking the adult as a reference. The forces acting on the ground by foot during walking and their vertical and horizontal components are obtained. The angle between the ground reaction force and the walking direction of pedestrian is measured by simulation. Given the energy distribution during walking, the recovery and storage device is proposed to convert the work done by foot into hydraulic oil energy by collecting the power induced by vertically applied foot force. It is estimated by computation that the hydraulic power of about 20 W can be captured from single foot averagely during human walking without load. © 2018 Journal of Mechanical Engineering.

Keyword :

Adams simulation Energy recovery Gait Human walking Hydraulic power

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GB/T 7714 Shi, Hu , Wang, Zheng , He, Bin et al. Design and Analysis of Mechanical-hydraulic Component to Harvest Energy from Human Walking [J]. | Jixie Gongcheng Xuebao/Journal of Mechanical Engineering , 2018 , 54 (20) : 170-179 .
MLA Shi, Hu et al. "Design and Analysis of Mechanical-hydraulic Component to Harvest Energy from Human Walking" . | Jixie Gongcheng Xuebao/Journal of Mechanical Engineering 54 . 20 (2018) : 170-179 .
APA Shi, Hu , Wang, Zheng , He, Bin , Mei, Xuesong , Jia, Kun . Design and Analysis of Mechanical-hydraulic Component to Harvest Energy from Human Walking . | Jixie Gongcheng Xuebao/Journal of Mechanical Engineering , 2018 , 54 (20) , 170-179 .
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The Adaptive Fading Extended Kalman Filter SOC Estimation Method for Lithium-ion Batteries EI Scopus CPCI-S
会议论文 | 2018 , 145 , 357-362
WoS CC Cited Count: 1 SCOPUS Cited Count: 1
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Abstract :

© 2018 The Authors. Published by Elsevier Ltd. The adaptive fading extended Kalman filter (AFEKF) is proposed for the accuracy and convergent speed problem of state of charge (SOC) estimation. This filter algorithm combines the adaptive extended Kalman filter and fading extended Kalman filter, which solves the problem of uncertainty of system noise and over-reliance on old data. The equivalent circuit model is utilized and the variable forgetting factor recursive least square(VFFRLS) is adopted to identify the model parameters. Experimental test platform is established to validate the method. Results show that the method is able to effectively improve the convergent speed and accuracy of SOC estimation, and the SOC error is less than 2%.

Keyword :

lithium-ion battery state of charge the adaptive fading extended Kalman filter the adaptive Kalman filter

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GB/T 7714 Zhao, Yunfei , Xu, Jun , Wang, Xiao et al. The Adaptive Fading Extended Kalman Filter SOC Estimation Method for Lithium-ion Batteries [C] . 2018 : 357-362 .
MLA Zhao, Yunfei et al. "The Adaptive Fading Extended Kalman Filter SOC Estimation Method for Lithium-ion Batteries" . (2018) : 357-362 .
APA Zhao, Yunfei , Xu, Jun , Wang, Xiao , Mei, Xuesong . The Adaptive Fading Extended Kalman Filter SOC Estimation Method for Lithium-ion Batteries . (2018) : 357-362 .
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An experimental investigation into the defects of laser-drilled holes in thermal barrier coated Inconel 718 superalloys EI SCIE Scopus
期刊论文 | 2018 , 96 (1-4) , 1467-1481 | INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
SCOPUS Cited Count: 1
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Abstract :

Delamination and microcracks as well as spatters are known to be inherently associated with laser drilling thermal barrier coated materials. In this study, response surface method (RSM) and single-variable method were employed to correlate the laser parameters including pulse length, peak power, pulse rate, and pulse numbers as well as the interactions among them with such defects in laser percussion drilling. Detailed observation and analysis reveals that narrow pulse length, lower peak power, and low pulse rate can produce smaller cracks area on the side wall, among which the effect of pulse length is more outstanding. As for spatters around hole entrance, the interactions among these factors were identified and a combination of higher peak power, proper pulse length (in this model not exceed 1 ms), higher pulse rate, and small number of pulses are conducive to minimize the spatter volume. Furthermore, the thermal effect near the thermal barrier coating/bond coat (TBC/BC) is especially prominent in laser drilling with wide pulse length and low peak power. The removal mechanism occurred near TBC/BC also determines the delamination crack size. And higher peak power with narrow pulse length should be a good strategy in order to break through the TBC as soon as possible and shelter the TBC or TBC/BC from thermal damage.

Keyword :

Laser percussion drilling Inconel 718 superalloys Delamination Thermal barrier coatings (TBCs) Spatters and cracks

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GB/T 7714 Wang, Rujia , Wang, Kedian , Dong, Xia et al. An experimental investigation into the defects of laser-drilled holes in thermal barrier coated Inconel 718 superalloys [J]. | INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY , 2018 , 96 (1-4) : 1467-1481 .
MLA Wang, Rujia et al. "An experimental investigation into the defects of laser-drilled holes in thermal barrier coated Inconel 718 superalloys" . | INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY 96 . 1-4 (2018) : 1467-1481 .
APA Wang, Rujia , Wang, Kedian , Dong, Xia , Fan, Zhengjie , Duan, Wenqiang , Mei, Xuesong et al. An experimental investigation into the defects of laser-drilled holes in thermal barrier coated Inconel 718 superalloys . | INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY , 2018 , 96 (1-4) , 1467-1481 .
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Investigation on a No Trial Weight Spray Online Dynamic Balancer SCIE
期刊论文 | 2018 | SHOCK AND VIBRATION
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In order to suppress the spindle vibration with high efficiency and high precision, a no without trial weight spray online balance method is proposed in this paper. By analyzing the relationship between the unbalanced excitation and the unbalanced response of the spindle, the relationship between the dynamic influence coefficient and the system model is studied. A high-speed spindle finite element analysis model was established, and the dynamic influence coefficient matrix was identified. A no trial weight spray online dynamic balancing system was developed, which has the advantages of without trial weight and high-precision loading. A new type of integrated balancing terminal that was formed using 3D printing technology was first proposed by our research group, and its advantages in various aspects are significantly higher than traditional assembly balanced terminals. The experimental verification of the without trial weight spray online dynamic balancing system was performed on a high-speed spindle test stand. Experiments show that the no trial weight spray online balancing method proposed in this paper can achieve high-efficiency and high-precision vibration suppression, greatly reducing balance time and cost of the spindle. At the same time, the online balance test also verified the reliability of the integrated balanced terminal.

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GB/T 7714 Yun, Xialun , Mei, Xuesong , Jiang, Gedong et al. Investigation on a No Trial Weight Spray Online Dynamic Balancer [J]. | SHOCK AND VIBRATION , 2018 .
MLA Yun, Xialun et al. "Investigation on a No Trial Weight Spray Online Dynamic Balancer" . | SHOCK AND VIBRATION (2018) .
APA Yun, Xialun , Mei, Xuesong , Jiang, Gedong , Hu, Zhenbang , Zhang, Zunhao . Investigation on a No Trial Weight Spray Online Dynamic Balancer . | SHOCK AND VIBRATION , 2018 .
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Thermal Characteristics of Plastic Film Tension in Roll-to-Roll Gravure Printed Electronics SCIE Scopus
期刊论文 | 2018 , 8 (2) | APPLIED SCIENCES-BASEL
WoS CC Cited Count: 1 SCOPUS Cited Count: 1
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In the printing section of a roll-to-roll gravure printed electronics machine, the plastic film tension is directly associated with the product quality. The temperature distribution of the plastic film in the printing section is non-uniform, because of the higher drying temperature and the lower room temperature. Furthermore, the drying temperature and the room temperature are not constants in industrial production. As the plastic film is sensitive to temperature, the temperature of the plastic film will affects the web tension in the printing section. In this paper, the thermal characteristics of the plastic film tension in roll-to-roll gravure printed electronics are studied in order to help to improve the product quality. First, the tension model including the factor of temperature is derived based on the law of mass conservation. Then, some simulations and experiments are carried out in order to in-depth research the effects of the drying temperature and room temperature based on the relations between system inputs and outputs. The results show that the drying temperature and room temperature have significant influences on the web tension. The research on the thermal characteristics of plastic film tension would benefit the tension control accuracy for further study.

Keyword :

printed electronics thermal characteristics drying temperature room temperature web tension tension model

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GB/T 7714 He, Kui , Liu, Shanhui , Wang, Kedian et al. Thermal Characteristics of Plastic Film Tension in Roll-to-Roll Gravure Printed Electronics [J]. | APPLIED SCIENCES-BASEL , 2018 , 8 (2) .
MLA He, Kui et al. "Thermal Characteristics of Plastic Film Tension in Roll-to-Roll Gravure Printed Electronics" . | APPLIED SCIENCES-BASEL 8 . 2 (2018) .
APA He, Kui , Liu, Shanhui , Wang, Kedian , Mei, Xuesong . Thermal Characteristics of Plastic Film Tension in Roll-to-Roll Gravure Printed Electronics . | APPLIED SCIENCES-BASEL , 2018 , 8 (2) .
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Positioning and navigation system based on machine vision intended for laser-electrochemical micro-hole processing EI SCIE Scopus
期刊论文 | 2018 , 94 (1-4) , 1397-1410 | INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
SCOPUS Cited Count: 1
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In order to improve efficiency and quality of micro-hole processing, a laser-electrochemical micro-hole processing is applied to the micro-hole processing of aero engine blade, i.e., laser drilling and electrochemical machining are performed. However, when electrode wire is inserted into micro-hole, due to the positioning error, it can collide with blade, which could result in short circuit or electrode wire damage. Hitherto, the positioning of electrode wire and micro-hole was achieved by artificial observation, but its efficiency is low, especially for micro-holes with small diameter. Namely, a large amount of asymmetric micro-holes is produced due to the low-accuracy positioning by artificial observation; therefore, machining accuracy and consistency of micro-hole cannot be guaranteed. In this study, a positioning and navigation system based on machine vision is applied for the first time to the laser-electrochemical micro-hole processing. The proposed system is based on parallel installation of camera and electrode wire. A novel hand-eye calibration method, wherein rotation angle and translation vector are calibrated step by step, is proposed for the case when electrode wire is beyond the view area of camera. The tree traversal binary image boundary tracking algorithm is adopted to image processing. The data stem definition is proposed to detect micro-hole edge with burrs. Before electrochemical machining, the micro-hole image is captured by camera that is navigated to the micro-hole top, and then, the captured image is processed in order to get the coordinates of micro-hole center, which enables navigation of electrode wire to the micro-hole center; thus, the accurate positioning and navigation of micro-hole are achieved.

Keyword :

Calibration Machine vision Positioning Micro-hole detection Laser-electrochemical processing Navigation

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GB/T 7714 Jia, Guohua , Dong, Xia , Huo, Quan et al. Positioning and navigation system based on machine vision intended for laser-electrochemical micro-hole processing [J]. | INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY , 2018 , 94 (1-4) : 1397-1410 .
MLA Jia, Guohua et al. "Positioning and navigation system based on machine vision intended for laser-electrochemical micro-hole processing" . | INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY 94 . 1-4 (2018) : 1397-1410 .
APA Jia, Guohua , Dong, Xia , Huo, Quan , Wang, Kedian , Mei, Xuesong . Positioning and navigation system based on machine vision intended for laser-electrochemical micro-hole processing . | INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY , 2018 , 94 (1-4) , 1397-1410 .
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Computational and experimental study on hole evolution and delamination in laser drilling of thermal barrier coated nickel superalloy EI SCIE Scopus
期刊论文 | 2018 , 107 , 161-175 | OPTICS AND LASERS IN ENGINEERING
SCOPUS Cited Count: 1
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Computational study related to thermal stress and hole formation in laser percussion drilling of thermal barrier coated nickel alloy based on a thermal-mechanical coupled model, combined with experimental work, was conducted in this paper. The effects of laser parameters (pulse duration and laser power) and material property (elastic modulus) on delamination were discussed based on thermal stress analysis. Laser drilling with higher peak power density (>1e11W/m(2)) can quickly get a through-hole of 2.3 mm within 10 pulses. Stress mutation and thermal stress shock near the interfaces are responsible for the crack formation. For the case with low peak power density, solidification rate and solidification sequence between materials should also be considered. Under the same pulse duration, the thermal stress would be enhanced with increasing of laser power. With the same pulse energy, a more intense thermal stress shock in pulse cycles can be produced under a longer pulse duration. And this shock effect near the interfaces can be alleviated when laser source is far from the interfaces. Heat accumulating effect induced by stagnation phenomenon, mainly due to lower peak power, can contribute to crack extension along the interfaces. Thus, breaking through the first two layers with high drilling efficiency is an effective way to restrain/prevent the delamination and viable parameters are also determined in the paper. Furthermore, it would offer great benefits for delamination prevention that make sure the elastic modulus of TBC and BC close to each other along the thickness with a gradually approaching method in their preparations. (C) 2018 Elsevier Ltd. All rights reserved.

Keyword :

Thermal barrier coatings (TBCs) Simulation Delamination Laser drilling Thermal stress

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GB/T 7714 Wang, Rujia , Duan, Wenqiang , Wang, Kedian et al. Computational and experimental study on hole evolution and delamination in laser drilling of thermal barrier coated nickel superalloy [J]. | OPTICS AND LASERS IN ENGINEERING , 2018 , 107 : 161-175 .
MLA Wang, Rujia et al. "Computational and experimental study on hole evolution and delamination in laser drilling of thermal barrier coated nickel superalloy" . | OPTICS AND LASERS IN ENGINEERING 107 (2018) : 161-175 .
APA Wang, Rujia , Duan, Wenqiang , Wang, Kedian , Dong, Xia , Fan, Zhengjie , Mei, Xuesong et al. Computational and experimental study on hole evolution and delamination in laser drilling of thermal barrier coated nickel superalloy . | OPTICS AND LASERS IN ENGINEERING , 2018 , 107 , 161-175 .
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