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Self-adjusted adsorption strategy for an aircraft skin inspection robot
Jiayue Gu,Congqing Wang,Xuewei Wu 대한기계학회 2018 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.32 No.6
A self-adjusted adsorption strategy is developed for an aircraft skin inspection robot with double frames to improve adsorption safety and movement stability. The principal aim is to determine the optimal value of adsorption force when the robot slips or overturns on the fuselage. A pneumatic system that consists of suction cup and cylinder control is designed. Static force analysis shows that the adsorption force of the aircraft skin inspection robot is related to the curvature of the fuselage. The relationship between the minimum value of adsorption force and offset angle of the robot barycenter is established with the least-squares support vector regression algorithm. Pulsewidth modulation is then applied to control the pressure difference in the suction cup. Experimental results prove the feasibility of suction cup control with the self-adjusted adsorption strategy.
Jiayue Wang,Yuwen Zhu,Hui Li,Sheng Liu,Shengnan Shen,Lei Wang,Shifeng Wen 한국정밀공학회 2022 International Journal of Precision Engineering and Vol.9 No.4
Laser-based powder bed fusion (L-PBF) is an additive manufacturing (AM) technology that uses a high-energy–density laser to scan through a powder bed and completely melts the metal powder. The environment inside the printer chamber, including the flow field of the shielding gas and the spatter particles induced by laser–powder interactions, is essential for product quality. For the first time, this work built a full-size model of printer chamber, and numerically investigated the interaction between the shielding argon flow and the laser induced spatter particles with considering laser temperature. A full-size geometric model of a commercial L-PBF printer with a Gaussian heat source was constructed, as well as a movable particle-release source model for particle injection. The distribution of the argon flow field, the temperature field, and the trajectory and deposition of spatter particles, particularly above the workbench during the L-PBF process were quantitatively analyzed. The results show that the gas flow within 30 mm above the workbench is uniform, and in the upper region of the printer chamber, the flow field is disorderly. The laser can only induce high temperature and upward gas flow in a small region close to the workbench (the height less than 1.6 mm), and the laser induced velocity disturbance in rest regions of the L-PBF printer is negligible. Particles injected towards the outlet (ID4) are mostly blown into the outlet, and in the other four injection directions, more than 90% of spatter particles are deposited inside the printer chamber, especially more than 50% deposited on the workbench. Increasing the laser power (from 100 to 200 W) has little effect on particle deposition on the workbench. Results will be helpful for improving the L-PBF product quality.
Predicting wind-induced structural response with LSTM in transmission tower-line system
Jiayue Xue,Ge Ou 국제구조공학회 2021 Smart Structures and Systems, An International Jou Vol.28 No.3
Wind-induced dynamic response of the nonlinear structure is critical for the structural safety and reliability. The traditional approaches for this response including observation or simulation focus on the structural health monitoring, the experiment, or finite element model development. However, all these approaches require high cost or computational investment. This paper proposes to predict the wind-induced dynamic response of the nonlinear structure with a novel deep learning approach, LSTM, and applies this in a structural lifeline system, the transmission tower-line system. By constructing the optimized LSTM architectures, the proposed method applies to both the linear structure, the single transmission tower and the nonlinear structure, the transmission tower-line system, with promising results for the dynamic and extreme response prediction. It can conclude that the layers and the hidden units have a strong impact on the LSTM prediction performance, and with proper training data set, the computational time can significantly decrease. A comparison surrogate model developed by CNN is also utilized to demonstrate the robustness of the LSTM-based surrogate model with limited data scale.
Growth of lead-based functional crystals by the vertical bridgman method
Xu Jiayue The Korea Association of Crystal Growth 2006 韓國結晶成長學會誌 Vol.16 No.1
Some lead-based crystals show excellent ferroelectric, piezoelectric or scintillation properties and have attracted much attention in recent years. However, the erosion of the high temperature solution on platinum crucible and the evaporation of PbO component are the main problems often encountered during the crystal growth. In this paper, we reported recent progress on the Bridgman growth of lead-based functional crystals, such as novel relaxor ferroelectric crystals (PZNT and PMNT), scintillation crystals $(PbWO_4,\;PbF_2\;and\;PbClF)$ and piezoelectric crystals $(Pb_5Ge_3O_{11}\;and\;Pb_2KNb_5O_{15}),$ in Shanghai Institute of Ceramics, Chinese Academy of Sciences. The vertical Bridgman method has been modified to grow PZNT crystals from high temperature solution and as-grown crystals have been characterized. Large size lead-based scintillators, $PbWO_4\;and\;PbF_2$ crystals, have been mass-produced by the vertical Bridgman method in the multi-crucible fumace. These crystals have been supplied to CERN and other laboratories for high-energy physics experiments. The Bridgman growth of piezoelectric crystals $Pb_5Ge_3O_{11}\;and\;Pb_2KNb_5O_{15}$ are discussed also.
Experimental and Modelling Study of the Denaturation of Milk Protein by Heat Treatment
Fang Qian,Jiayue Sun,Di Cao,Yanfeng Tuo,Shujuan Jiang,Guangqing Mu 한국축산식품학회 2017 한국축산식품학회지 Vol.37 No.1
Heat treatment of milk aims to inhibit the growth of microbes, extend the shelf-life of products and improve the quality of the products. Heat treatment also leads to denaturation of whey protein and the formation of whey protein-casein polymer, which has negative effects on milk product. Hence the milk heat treatment conditions should be controlled in milk processing. In this study, the denaturation degree of whey protein and the combination degree of whey protein and casein when undergoing heat treatment were also determined by using the Native-PAGE and SDS-PAGE analysis. The results showed that the denaturation degree of whey protein and the combination degree of whey protein with casein extended with the increase of the heat-treated temperature and time. The effects of the heat-treated temperature and heat-treated time on the denaturation degree of whey protein and on the combination degree of whey protein and casein were well described using the quadratic regression equation. The analysis strategy used in this study reveals an intuitive and effective measure of the denaturation degree of whey protein, and the changes of milk protein under different heat treatment conditions efficiently and accurately in the dairy industry. It can be of great significance for dairy product proteins following processing treatments applied for dairy product manufacturing.
Bobo Yang,Jiayue Xu,Jun Zou,Yan Zhang,Tian Tian,Yaoqing Chu,Meiling Wang 한양대학교 세라믹연구소 2016 Journal of Ceramic Processing Research Vol.17 No.6
Tm3+, Dy3+ and Tm3+/Dy3+ co-doped bismuth silicate (Bi4Si3O12, BSO) crystals were successfully grown by the modified verticalBridgeman method. The crystals have about 80% transmittance in the range from 320 nm to 650 nm except several obviouscharacteristic absorption peaks corresponding to transitions of 4f electrons of Tm3+ and Dy3+. The luminescence properties forwhite light emitting diode (w-LED) were investigated. Energy transfer from the Bi3+ ions to the Tm3+ and Dy3+ ions in Tm3+or/and Dy3+ co-doped Bi4Si3O12 crystal has been established by photoluminescence investigation upon UV excitation. Whenexcited by a proper UV-light, Tm3+ doped BSO crystal shows blue emission band centered at 460 nm ascribed to Tm3+ (1D2→ 3F4), Dy3+ doped BSO crystal shows blue band at 480 nm (4F9/2→ 6H15/2), yellow band at 574 nm (4F9/2→ 6H13/2) and red bandat 662 nm (4F9/2→ 6H11/2) of Dy3+ ions. A white light with chromaticity coordinate of x = 0.3298, y = 0.2905 by excitation of357 nm is achieved from Tm3+/Dy3+ co-doped Bi4Si3O12 crystal. These results indicate that Tm3+/Dy3+ co-doped Bi4Si3O12 as awhite emitting crystal has a potential application in white-LED.
A Study on the Factors that Influence Wearable Users' Quantified Self Based on UTAUT Model
Hong Jin,Jiayue Yan ASCONS 2020 INTERNATIONAL JOURNAL OF EMERGING MULTIDISCIPLINAR Vol.4 No.2
The integrated development of artificial intelligence and wearable technology provides technical conditions for users to participate in quantifying themselves. However, in the current, the research on wearable devices and other technical products is very lacking. Based on the existing user acceptance model, this paper proposes a quantitative self-acceptance model for wearable device users, and puts forward relevant assumptions and provide advice on the development of wearable technology
Hu Hao,Wang Jiayue,Chen Ai,Liu Yang 한국원자력학회 2023 Nuclear Engineering and Technology Vol.55 No.1
Autonomous radiation source detection has long been studied for radiation emergencies. Compared to conventional data-driven or path planning methods, deep reinforcement learning shows a strong capacity in source detection while still lacking the generalized ability to the geometry in unknown environments. In this work, the detection task is decomposed into two subtasks: exploration and localization. A hierarchical control policy (HC) is proposed to perform the subtasks at different stages. The low-level controller learns how to execute the individual subtasks by deep reinforcement learning, and the highlevel controller determines which subtasks should be executed at the current stage. In experimental tests under different geometrical conditions, HC achieves the best performance among the autonomous decision policies. The robustness and generalized ability of the hierarchy have been demonstrated