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2022 IET International Conference on Engineering Technologies and Applications, IET-ICETA 2022

作者： Liu, Chun-Hung Lai, Wei-Lin Shen, Shang-Chi Yeh, Shun-Pin Wu, Po-Cheng Wang, Yu-Chien Luo, Guan-Yu National Taitung University Interdisciplinary Program of Green and Information Technology Taitung Taiwan

ISBN: (数字)9781665491389

ISBN: (纸本)9781665491389

The indoor quadcopter is widely adopted because of its properties of maneuverability, mechanical simplicity, and excellent research platforms to perform control strategies. In this study, impact of several control strategies on altitude control has been provided with classic ZN PID, Fuzzy-based, and GA-based controllers. The buildin nonlinear mathematical model of Parrot Mambo Minidrone is adopted as the control models for the design and deployment in this study. According to the control models, a set of parameters of classic ZN PID controller is obtained as a baseline strategy. Fine-tuned parameters of classic PID are simulated to observe the altitude performance. A Fuzzy-based controller with proper fuzzy sets is also provided to examine the performance. Eventually, an empirical GA-based controller is developed to be compared with other control strategies. The results show that the GA-based controller performed the smallest integral of absolute error of altitude performance and demonstrated averagely 87% improvement of overall altitude error as compared with the baseline controller. © 2022 IEEE.

关键词： Genetic algorithms

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Excitation of surface plasmon mode in bulk semiconductor lasers

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Applied Optics 2023年第14期62卷 3690-3695页

作者： Tseng, Chih Lung Wang, Chien Kun Lai, Chih Hsien Tsai, Cheng Hsiung Chiang, Po Jui Interdisciplinary Program of Green and Information Technology National Taitung University Taitung Taiwan Department of Electronic Engineering National Kaohsiung University of Science and Technology Kaohsiung Taiwan Department of Electronic Engineering National Yunlin University of Science and Technology Douliou Taiwan

We propose a realistic process for the excitation of surface plasmon polariton (SPP) modes in a silicon photonic waveguide (WG). The process involves the placement of buried oxide (BOX) composed of silica between a WG and silicon substrate. When the BOX thickness is manipulated, different amounts of modal power leak toward the BOX into the substrate and simultaneously acquire compensation from a semiconductor located on the WG. The compensation related to the leakage can be used to infer transparency gain. Similar to the case for a semiconductor laser cavity, the lowest transparency gain among WG modes can be favored;thus, only one mode can survive in the WG, and it is in the region with the specified BOX thickness. Finally, we propose a credible mechanism suitable for demonstrating the region requirements of the existence of SPP modes. © 2023 Optica Publishing Group.

关键词： Silica

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A study on the feasibility of friction stir welding in joining dissimilar metals for SS400 and Ti-6Al-4V 9

A study on the feasibility of friction stir welding in joini...

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9th International Conference on Precision Machinery and Manufacturing technology, ICPMMT 2024

作者： Hsieh, M.J. Chu, L.M. Chang, Y.P. Department of Power Mechanical Engineering National Taitung Junior College Taitung950303 Taiwan Interdisciplinary Program of Green and Information Technology National Taitung University Taitung95092 Taiwan Department of Mechanical Engineering Kun Shan University Tainan71000 Taiwan

This study designed friction stir multi-pass welding machine to conduct friction stir welding on carbon steel/titanium alloy clad sheets. The experimental process utilized the pin and pinless tools. The results demonstrate that the two dissimilar materials can be welded using the assembly-embedded rod pinless tool under the following welding conditions: a rotational speed of 1200 rpm, a downward force of 4 kN, a welding speed of 15 mm/min, and tool offset distances of 5 and 10 mm. Furthermore, this study investigated the microstructure and mechanical properties of the weld. In addition, the peak temperature measured at the joint interface exceeded the β phase transition temperature of the titanium alloy and surpassed 1000oC. The shear tensile test shows the weld's failure load was about 4300 N. The intermetallic compound at the welding interface has a microhardness value of approximately 400 Hv. According to the results of SEM observations and EDS composition element analysis, the elements of low carbon steel and titanium alloy at the interface of the clad sheet diffused and formed Fe-Ti intermetallic compounds. © 2024 Institute of Physics Publishing. All rights reserved.

关键词： Titanium alloys

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Image Recognition by YoloV4 for Vehicle Type Distinction in Side of Road

Image Recognition by YoloV4 for Vehicle Type Distinction in ...

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2022 IET International Conference on Engineering Technologies and Applications, IET-ICETA 2022

作者： You, Ting-Hao Wu, Yi-Chao Fanjiang, Yong-Yi Fu Jen Catholic University Computer Science and Information Engineering New Taipei City Taiwan National Taitung University Interdisciplinary Program of Green and Information Technology Taitung Taiwan

ISBN: (数字)9781665491389

ISBN: (纸本)9781665491389

At present, most of the domestic and foreign research on vehicle recognition focuses on real-time camera recognition in front of the vehicle while driving and real-time camera recognition over the road for overhead camera angles. For roads in mountainous areas or special terrain, due to the small hinterland on the left and right side of the road, it is not easy to set up overhead camera systems for the road. Therefore, this thesis proposes 'Yolo_v4-based road vehicle recognition' to solve the above problem. Unlike the overhead camera system, this side camera detachable temporary road vehicle recognition system only needs a very small road hinterland and can reduce the cost of space construction. The Yolo_V4 deep learning algorithm can accurately identify different vehicle types to ensure road safety and traffic monitoring. In this study, the accuracy of the vehicle recognition model for the side camera angle is 96%, which is comparable to the accuracy of the vehicle recognition model for the top camera angle. © 2022 IEEE.

关键词： Object detection

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Nonlinear dynamic of turbulent bearing-rotor system under quadratic damping with HSFD and active control

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Journal of the Brazilian Society of Mechanical Sciences and Engineering 2024年第3期46卷 1-13页

作者： Chang-Jian, Cai-Wan Chu, Li-Ming Chen, Tsung-Chia Yau, Her-Terng Department of Mechanical Engineering National Chin-Yi University of Technology No.57 Sec. 2 Zhongshan Rd. Taiping Dist. Taichung411030 Taiwan Interdisciplinary Program of Green and Information Technology National Taitung University Taitung City95092 Taiwan Department of Mechanical Engineering National Chung Cheng University No.168 Sec. 1 University Rd. Chiayi Minhsiung621301 Taiwan

Traditional squeeze-film dampers are used in modern aircraft generators as vibration-suppressing devices. However, the conventional squeeze-film damper has the disadvantage of highly nonlinear oil film force. This study aims to improve the dynamic characteristics of the squeeze-film damper by changing its geometric structure, so a hybrid squeeze-film damper (HSFD) is proposed. Besides, the turbulent flow could also be found in lubrication analysis of high rotating speed turbo-machineries, and the ignorance of turbulent flow would lead to significant failure results. Accordingly, the study presents a nonlinear dynamic analysis of a turbulent bearing-rotor system under quadratic damping equipped with HSFD. The dimensionless speed ratio and dimensionless unbalance parameter are used to plot the bifurcation diagrams, and abundant harmonic, subharmonic, quasi-periodic, and even chaotic motions are found with dynamic trajectories, power spectrum, Poincaré maps, Lyapunov exponent, and fractal dimension, simultaneously. Finally, an active control method is applied to suppress the chaotic responses. The simulation results will provide valuable suggestions for designing and developing rotating machinery, such as rotor-bearing systems operating at high rotational speeds and nonlinearity. © The Author(s), under exclusive licence to The Brazilian Society of Mechanical Sciences and Engineering 2024.

关键词： Rotating machinery

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The Effects of Externally Magnetic Fields and Electrically Conducting Lubricants at Transient Squeeze MEHL Motion with Elastic Coating

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Journal of the Chinese Society of Mechanical Engineers, Transactions of the Chinese Institute of Engineers, Series C/Chung-Kuo Chi Hsueh Kung Ch'eng Hsuebo Pao 2022年第1期43卷 29-35页

作者： Chu, Li-Ming Chang, Yuh-Ping Cai-Wan, Chang-Jian Interdisciplinary Program of Green and Information Technology National Taitung University Taitung95092 Taiwan Department of Mechanical Engineering Kun Shan University Tainan71070 Taiwan Department of Mechanical and Automation Engineering I-Shou University Kaohsiung84001 Taiwan

The pure squeeze magneto-elastohydrodynamic lubrication (MEHL) motion of point contacts with an electrically conducting fluid in transverse magnetic field on elastic coating is explored under constant load process. The modified Reynolds, the rheology, the force balance, and the elastic deformation equations must be solved simultaneously to obtain the transient pressure profiles, film shapes, elastic deformation, and normal squeeze velocities. The differences between classical EHL and MEHL are discussed during the pure squeeze process. The simulation results reveal that the effect of externally applied magnetic field is equivalent to enhancing the effective lubricant viscosity. Therefore, as the Hartmann number (M) increases, the effect becomes more obvious. The larger the Hartmann number, the thicker the central film thickness and minimum film thickness, the smaller the maximum central pressure, the later the maximum central pressure and the dimple are formed, the smaller the central normal squeeze velocity. The central pressure decreases with increasing M at the initial stage. The central pressure increases with increasing M at the deformation stage. © 2022, Chinese Mechanical Engineering Society. All right reserved.

关键词： Magnetos

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Shape-based proximity effect correction method for throughput, fidelity, and contrast enhancement of electron-beam writer

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Applied Physics Express 2023年第1期16卷 011001-011001页

作者： Liu, Chun-Hung Ding, Ze-An Wang, Shun-Ping Interdisciplinary Program of Green and Information Technology National Taitung University Taitung Taiwan Department of Applied Science National Taitung University Taitung Taiwan

Conventional shape-based proximity effect correction (PEC) methods can only improve pattern fidelity and present a risk to correction effectiveness under severe resist-contour distortions for electron-beam writers. Herein, a shape-based PEC method for effectively improving both the pattern fidelity and energy slope without the risk in realizing high throughput, fidelity, and contrast is presented. An extra-framed pattern added to the target pattern is optimized to achieve better trade-off between contrast improvement and writing-time reduction. The proposed method demonstrated significant improvements in lithographic performance compared with the conventional and dose-based PEC methods for high-numerical-aperture extreme-ultraviolet mask and aggressive patterns. © 2023 The Japan Society of Applied Physics

关键词： Electron beams

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Effects of shot peening on the tribological properties of aluminum alloys with T6 treatment 6

Effects of shot peening on the tribological properties of al...

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6th International Conference on Precision Machinery and Manufacturing technology, ICPMMT 2021

作者： Chang, Y.P. Chu, L.M. Liu, C.T. Wang, J.C. Chen, K.W. Green Energy Technology Research Center Kun Shan University Taiwan Interdisciplinary Program of Green and Information Technology Department of Applied Science National Taitung University Taiwan

Aluminum alloy has many excellent properties such as light texture, corrosion resistance, and easy processing, etc., so it is widely used on the market. The shot peening method can effectively eliminate residual stress and increase its reverse stress, so as to achieve the purpose of anti-fatigue and prolong service life. Therefore, the effects of shot peening on the tribological properties of aluminum alloys with T6 Treatment are investigated in this study. The reciprocating friction test was carried out with three different aluminum alloy mid-plate test pieces, two different shot peening impact parameters and two different loads. Moreover, the macroscopic and microscopic methods are used to discuss the tribological performance of friction and wear. The experimental results show that the plastic deformation is formed on the surface of the material by the shot peening impact method. Although the hardness increases, it also causes inelastic and brittle properties. It can be seen that although the ball striking method can improve the performance of bending, tensile, compression and impact resistance to achieve the purpose of prolonging the service life, when repeated stress is applied, the fatigue resistance will decrease and it will not resist wear. The results will be beneficial to the future of the aerospace industry to develop more internationally competitive products. © 2021 Institute of Physics Publishing. All rights reserved.

关键词： Shot peening

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Effects of the rolling directions on wear of the aluminum alloys 4th

Effects of the rolling directions on wear of the aluminum al...

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4th International Conference and Exhibition on Pharmaceutical Sciences and technology, PST 2021, and the 2nd International Conference on Engineering Tribology and Applied technology, ICETAT 2020

作者： Chang, Yuh-Ping Chu, Li-Ming Liu, Chien-Te Wang, Jin-Chi Chen, Kao-Wei Green Energy Technology Research Center Kun Shan University Taiwan Interdisciplinary Program of Green and Information Technology Department of Applied Science National Taitung University Taiwan

ISBN: (纸本)9783035715286

Due to the booming development of the automation industry and the transportation industry, the mechanical components are prone to wear under long-term operating conditions. To improve the wear resistance, effects of the rolling directions on wear of the aluminum alloys are studied. An optical microscope is used to analyze the crystal phase, and the correlation between the crystal grains and the rolling direction is studied. This study can therefore establish a key technology for improving the wear resistance of aluminum alloys. © 2021 Trans Tech Publications Ltd, Switzerland.

关键词： Wear resistance

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Effects of temperature rise of grease on lubricating performance of drive elements under the extreme pressure 4th

Effects of temperature rise of grease on lubricating perform...

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4th International Conference and Exhibition on Pharmaceutical Sciences and technology, PST 2021, and the 2nd International Conference on Engineering Tribology and Applied technology, ICETAT 2020

作者： Chang, Yuh-Ping Chu, Li-Ming Wang, Hsiang-Yu Liu, Chien-Te Chen, Qi-Wen Green Energy Technology Research Center Kun Shan University Taiwan Interdisciplinary Program of Green and Information Technology Department of Applied Science National Taitung University Taiwan

ISBN: (纸本)9783035715286

To transfer more power and use it in a heavy load environment, the contact surface between the ball and the track must bear great stress. The temperature always rises due to friction, which is more likely to cause problems of material deformation and fatigue failure. As a result, it will be a key technology to maintain a certain lubricating effect of the transmission components under the environment of heavy load and temperature rise. Through the analysis of friction coefficient and electrical contact resistance, the greases are used to test the lubricating effect of the transmission elements under the heavy load condition. The results will be helpful for the industry to use heavy load greases as a reference. © 2021 Trans Tech Publications Ltd, Switzerland.

关键词： Temperature

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