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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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Effect of environment temperature on web tension in shaft-less drive gravure printing system SCIE
期刊论文 | 2019 , 11 (2) | ADVANCES IN MECHANICAL ENGINEERING
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Abstract :

In the printing section of the shaft-less drive gravure printing machine, as the web material is sensitive to temperature, the web outside the drying devices will be affected by the changes of the environment temperature. In order to improve the printing precision in gravure printing machine, the effects of environment temperature on web tension in the printing section are studied in this article. Based on the law of mass conservation, the tension model including the factor of environment temperature is derived. Then some theoretical analyses and simulations are conducted to in-depth study the effects of environment temperature from the relations between inputs and output in a web span. Finally, some experiments are carried out to verify the characteristics of the tension subsystem including environment temperature. The result shows that the settling times decrease with the rise of the environment temperature in the transient responses, and the absolute changes of the steady-state tension decrease with the rise of the environment temperature in the steady-state responses as the inputs are the velocities of the printing rollers. The study on the effects of environment temperature on web tension would benefit the tension control and the register control for the further study.

Keyword :

environment temperature web tension Tension model shaft-less drive gravure printing

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GB/T 7714 He, Kui , Liu, Shanhui , Wang, Kedian et al. Effect of environment temperature on web tension in shaft-less drive gravure printing system [J]. | ADVANCES IN MECHANICAL ENGINEERING , 2019 , 11 (2) .
MLA He, Kui et al. "Effect of environment temperature on web tension in shaft-less drive gravure printing system" . | ADVANCES IN MECHANICAL ENGINEERING 11 . 2 (2019) .
APA He, Kui , Liu, Shanhui , Wang, Kedian , Mei, Xuesong . Effect of environment temperature on web tension in shaft-less drive gravure printing system . | ADVANCES IN MECHANICAL ENGINEERING , 2019 , 11 (2) .
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End-Effector Force Estimation for Flexible-Joint Robots With Global Friction Approximation Using Neural Networks SCIE
期刊论文 | 2019 , 15 (3) , 1730-1741 | IEEE TRANSACTIONS ON INDUSTRIAL INFORMATICS
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Abstract :

This paper proposes an improved disturbance observer to realize accurate contact force estimation using the joint torque sensor. The joint torque sensor separates the dynamics of the link side from the motor side of the robot manipulator. Therefore, only computing the partial dynamics on the link side can realize external force estimation. This can considerably reduce the modeling workload and error terms that may affect the estimation results. Furthermore, this paper presents that the observed residual value during free motion can be considered as the friction dynamics, which is approximated by the neural network (NN) due to its inherent capacity in approximating nonlinear functions. After that, the estimation accuracy of the observer is considerably improved. Compared to other local NN approximation method, we analyzes the properties of the friction force in detail to select appropriate excitation trajectory for accurate global approximation results using only limited training data. We have presented that the suitable excitation trajectory and the use of global basis function are the sufficient conditions for global friction approximation. The proof of this theorem is also given. The Kalman filter is also utilized to reduce the noise of the estimation results in real time. The experimental results also demonstrate the efficacy of the proposed method, which accurately estimates the contact force for flexible joint robots.

Keyword :

joint torque sensor Flexible-joint robot force estimation global friction approximation Kalman filtering neural networks (NNs)

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GB/T 7714 Liu, Xing , Zhao, Fei , Ge, Shuzhi Sam et al. End-Effector Force Estimation for Flexible-Joint Robots With Global Friction Approximation Using Neural Networks [J]. | IEEE TRANSACTIONS ON INDUSTRIAL INFORMATICS , 2019 , 15 (3) : 1730-1741 .
MLA Liu, Xing et al. "End-Effector Force Estimation for Flexible-Joint Robots With Global Friction Approximation Using Neural Networks" . | IEEE TRANSACTIONS ON INDUSTRIAL INFORMATICS 15 . 3 (2019) : 1730-1741 .
APA Liu, Xing , Zhao, Fei , Ge, Shuzhi Sam , Wu, Yuqiang , Mei, Xuesong . End-Effector Force Estimation for Flexible-Joint Robots With Global Friction Approximation Using Neural Networks . | IEEE TRANSACTIONS ON INDUSTRIAL INFORMATICS , 2019 , 15 (3) , 1730-1741 .
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Effect of Laser Shock Peening on Residual Stress, Microstructure and Hot Corrosion Behavior of Damage-Tolerant TC21 Titanium Alloy EI SCIE Scopus
期刊论文 | 2018 , 27 (9) , 4703-4713 | JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
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Abstract :

The effect of laser shock peening (LSP) on the residual stress, microstructure and hot corrosion behavior of damage-tolerant TC21 alloy was investigated. The equilateral scanning pattern was adopted to obtain a large overlapping area for LSP. The hot corrosion experiments in a salt mixture composed of 75wt.% Na2SO4+25wt.% NaCl at 700 and 800 degrees C for a total exposure of 25h were conducted. The results demonstrated that LSP caused a high compressive residual stress with a significant increase in micro-hardness and microstructural changes in the form of crystal defects, i.e., high density dislocations. The crystal defects promoted the outward diffusion of Al, Cr and Ti to form protective mixed oxides (Al, Cr, Ti)O-2. These oxides improved the adhesion of outer oxide layer and hindered the inward diffusion of O, S and Cl, which was beneficial to improve hot corrosion resistance. The mass gains of LSP-treated specimens after hot corrosion at 700 and 800 degrees C were, respectively, 3.72 and 4.78mg/cm(2), which were much lower than those of untreated specimens (5.65 and 6.81mg/cm(2)). Therefore, LSP leads to an improvement in resistance to hot corrosion of TC21 alloy.

Keyword :

residual stress hot corrosion TC21 alloy laser shock peening microstructure

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GB/T 7714 Geng, Yongxiang , Mei, Xuesong , Wang, Kedian et al. Effect of Laser Shock Peening on Residual Stress, Microstructure and Hot Corrosion Behavior of Damage-Tolerant TC21 Titanium Alloy [J]. | JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE , 2018 , 27 (9) : 4703-4713 .
MLA Geng, Yongxiang et al. "Effect of Laser Shock Peening on Residual Stress, Microstructure and Hot Corrosion Behavior of Damage-Tolerant TC21 Titanium Alloy" . | JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE 27 . 9 (2018) : 4703-4713 .
APA Geng, Yongxiang , Mei, Xuesong , Wang, Kedian , Dong, Xia , Yan, Xin , Fan, Zhengjie et al. Effect of Laser Shock Peening on Residual Stress, Microstructure and Hot Corrosion Behavior of Damage-Tolerant TC21 Titanium Alloy . | JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE , 2018 , 27 (9) , 4703-4713 .
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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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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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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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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
WoS CC Cited Count: 1 SCOPUS Cited Count: 3
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Abstract :

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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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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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: 2
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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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