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Ao Di,Wong Pak Kin,Huang Wei,Mei Xing Tai,Cao Yu Cong,Zhao Jing 한국자동차공학회 2020 International journal of automotive technology Vol.21 No.6
The assessment of vehicle dynamic comfort to human body vibration varies from person to person. Even though the dynamic comfort rating can be obtained by placing measurement devices over the cabin, passengers may have dissimilar sensations. For many car manufacturers, both subject and objective measurements are used together at development of new cars. To effectively assess the dynamic comfort of vehicle, this research explores the correlation between the objective measurement of the whole body vibration, hand-transmitted vibration and subjective assessment. The whole body vibration is measured from the backrest, seat surface and vehicle floor, whereas the hand-transmitted vibration is measured from the steering wheel. Four different vehicles are driven at various speeds on five types of pavements. Both simple linear regression and polynomial regression models based on Stevens’s power law from psychophysics are built to correlate the subjective and objective data. The regression results show that (1) the seat surface is more reliable than other positions for assessing the human body vibration; (2) the hand transmitted vibration on rough roads is more trustful for dynamic comfort evaluation than on smooth roads; (3) the overall dynamic comfort value is the most reliable index for dynamic comfort evaluation.
Chonghui Fan,Kelong Ao,Pengfei Lv,Jiancheng Dong,Di Wang,Yibing Cai,Qufu Wei,Yang Xu 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2018 NANO Vol.13 No.08
Fluorescent nitrogen-doped carbon dots (N-CDs) with excellent stability were prepared via single-step hydrothermal carbonization of citric acid (CA) and ethylenediamine (EDA). The as-prepared N-CDs emit blue fluorescence under the excitation of 365 nm and have a size distribution of 2.80 ffi 0.47 nm with benign size effect. The structure and morphology were further characterized by X-ray photoelectron spectroscopy (XPS) and Fourier transform infrared (FTIR) spectroscopy. It was found that the surface of the N-CDs was successfully functionalized, which presented water solubility and chelation with Fe3+. XRD results display a diffraction peak at 23.9 ℃, which corresponds to the (002) interlayer spacing of a graphitic structure revealing an amorphous carbon phase. Furthermore, due to good sensitivity, N-CDs were used as probes for Fe3+ detection. The low limit of detection of 0.6 μM as a fluorescence probe was successfully obtained based on the linear relationship between (F0 - F) / F0 and concentration of Fe3+ ions. Besides the satisfactory fluorescence, PVA/N-CDs membranes and fluorescent inks demonstrate potential for anti-counterfeiting applications due to its characteristic flexibility, transparency, removability and invisibility under ambient lighting.
Yecheng Wang,Zhen Luo,Di Zhang,Yue Yang,Jianming Hu,Muse Degefe Chewaka,Sansan Ao,Yang Li 한국탄소학회 2023 Carbon Letters Vol.33 No.1
Carbon nanotube fiber is a promising material in electrical and electronic applications, such as, wires, cables, batteries, and supercapacitors. But the problem of joining carbon nanotube fiber is a main obstacle for its practical development. Since the traditional joining methods are unsuitable because of low efficiency or damage to the fiber structure, new methods are urgently required. In this study, the joining between carbon nanotube fiber was realized by deposited nickel–copper doublelayer metal via a meniscus-confined localized electrochemical deposition process. The microstructures of the double-layer metal joints under different deposition voltages were observed and studied. It turned out that a complete and defect-free joint could be fabricated under a suitable voltage of 5.25 V. The images of the joint cross section and interface between deposited metal and fiber indicated that the fiber structure remained unaffected by the deposited metal, and the introduction of nickel improved interface bonding of double-layer metal joint with fiber than copper joint. The electrical and mechanical properties of the joined fibers under different deposition voltages were studied. The results show that the introduction of nickel significantly improved the electrical and mechanical properties of the joined fiber. Under a suitable deposition voltage, the resistance of the joined fiber was 37.7% of the original fiber, and the bearing capacity of the joined fiber was no less than the original fiber. Under optimized condition, the fracture mode of the joined fibers was plastic fiber fracture.
Adaptive Control with a Fuzzy Tuner for Cable-based Rehabilitation Robot
Jin Yang,Hang Su,Zhijun Li,Di Ao,Rong Song 제어·로봇·시스템학회 2016 International Journal of Control, Automation, and Vol.14 No.3
Since there are external uncertainties in the environment and the dynamic properties of human arm aretime-varying during movement, it is difficult to achieve good tracking performance during robot-aided rehabilitation. The purpose of this study is to develop an adaptive controller with a fuzzy tuner for a cable-based rehabilitationrobot. The fuzzy tuner can adjust the control parameters according to position error and the change of error, thus thetime-varying control parameters can be optimized by this tuner. To verify the proposed controller, simulation andexperiment studies using the cable-based rehabilitation robot are carried out. The rehabilitation robot is employedto complete two facilitation movements in the experiment. Results show that the adaptive controller can attain bettercontrol performance after tuning the control parameters.