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Improved Half-Bridge Z-Source Inverter Based Gamma Structure with Continuous Input Current 65

Improved Half-Bridge Z-Source Inverter Based Gamma Structure...

65th IEEE Annual International Scientific Conference on Power and Electrical engineering of Riga Technical University, RTUCON 2024

作者： Bahador, Asghar Babaei, Ebrahim Chauhan, Sachin University of Tabriz Faculty of Electrical and Computer Engineering Tabriz Iran Tallinn University of Technology Dept. of Electrical Power Engineering and Mechatronics Tallinn Estonia

ISBN: (纸本)9798350365771

In this paper, a new structure of the impedance source inverter based on the gamma half-bridge structure is proposed. In addition to having the advantages of the conventional gamma impedance source inverter, the proposed inverter also has more advantages. The boost factor has been improved in the proposed structure. Also, the number of passive components has decreased, which will increase the efficiency of the inverter. To reduce the size and weight of the proposed inverter, the voltage stress on the components of the proposed structure is reduced. Another advantage of the proposed structure is the continuity of the input current along with the improvement of the input current ripple. The continuity of input current is very important in applications of renewable energy sources such as solar energy. The continuity of the input current makes the maximum use of the input energy source. To see the advantages of the proposed inverter compared to other common inverters, a comparison between the proposed inverter and other common structures will be made and the results of the comparison will be expressed. Finally, PSCAD/EMTDC simulation software will be used to confirm the correctness of the calculated theoretical relationships. © 2024 IEEE.

关键词： Renewable energy

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CO2 Laser Fabrication of a Passive continuous-flow T-shaped Polymethyl Methacrylate (PMMA) Micromixer

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Lasers in Manufacturing and Materials Processing 2023年第3期10卷 373-388页

作者： Okello, Job Lazarus El-Bab, Ahmed M. Fath Yoshino, Masahiko El-Hofy, Hassan A. Industrial and Manufacturing Engineering Department University of Science and Technology New Borg El-Arab City Egypt Mechatronics and Robotics Engineering Department University of Science and Technology New Borg El-Arab City Egypt Department of Mechanical Engineering Tokyo Institute of Technology Tokyo Japan On leave from Department of Production Engineering Faculty of Engineering Alexandria University Alexandria Egypt

Since the emergence of microfluidics, the demand for microfluidic devices is ever increasing. Polymethyl methacrylate (PMMA) is extensively used to manufacture microfluidic devices because it is cheap, disposable, and biocompatible. CO2 laser micromachining of PMMA is cheap, fast, and efficient. However, thermal defects affect the process. In this work, a passive continuous-flow T-shaped micromixer was fabricated using a low-power CO2 laser. Microchannels were fabricated on PMMA substrates coated with a 1-µm layer of 99.95% pure aluminium. The power and speed of the laser varied from 1.5 to 7.5 W and 5 to 17.5 mm/s respectively. The effects of the deposited energy on surface roughness, heat-affected zone, and volumetric removal rate were examined. The microchannels were characterized to get the suitable dimensions for the micromixer’s microchannel which was fabricated at 3.0 W and 17.5 mm/s. The micromixer was bonded using the microwave welding technique and tested for leakage using purple dye by varying the flow pressure at intervals of 100 kPa for 20 min. Up to 1.5 MPa, no leakage occurred. Beyond 1.5 MPa, any increase in pressure resulted in leakage from the inlet tubes. Coating PMMA substrates with 99.95% pure aluminium before fabrication reduces thermal defects and improves efficiency. © 2023, The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature.

关键词： Carbon dioxide lasers

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Robust Path Following Control of Autonomous Surface Vessels 23

Robust Path Following Control of Autonomous Surface Vessels

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23rd International Conference on Control, Automation and Systems, ICCAS 2023

作者： Van Tran, Quoc Van Nguyen, Vinh Nguyen, Hoang Quang School of Mechanical Engineering Hanoi University of Science and Technology Department of Mechatronics Hanoi Viet Nam

ISBN: (纸本)9788993215274

This work presents a robust path following control method for autonomous surface vessels (ASVs) based on sliding mode control. To describe the control problem, the desired path of the vehicle is parameterized by one parameter and a parallel-transport path frame. The error dynamics of the path following system consisting of the position following error and the parameter speed's error are subsequently derived in the body-fixed coordinates of the vessel. Based on the path-following error, a geometric tracking control law is proposed at the kinematic level, i.e., as reference velocities, under which the path following task can be achieved asymptotically as time diverges. We then develop a robust force controller to steer the vehicle' velocity to track the reference velocity asymptotically and exponentially fast. Rigorous stability analysis is provided to show the effectiveness of the proposed control method. © 2023 ICROS.

关键词： Sliding mode control

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Optimal thermal design of anisotropic plates with arbitrary cutouts using genetic algorithm

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Theoretical & Applied Mechanics Letters 2022年第3期12卷 165-177页

作者： Mohammad Jafari Soheila Yari Mohammad Jafari Mechanical Engineering Department Shahrood University of TechnologyShahroodIran Faculty of Mechanical and Mechatronics Engineering Shahrood University of TechnologyShahroodIran

Anisotropic plates in different applications may have geometric defects such as openings and *** presence of the opening disturbs the heat flow,which creates significant thermal stress around the *** the heat flux is high enough,these extreme stresses can lead to structural *** article aims to obtain the optimal parameters for achieving the minimum value of the normalized stress near the cutout’s boundary in perforated anisotropic plates utilizing the genetic *** parameters include the curvature of opening’s corners,orientation angle of opening,fibers angle,heat flux angle,and opening’s *** plate is under heat flux,and the opening’s border is thermally *** stress distribution around the opening is calculated using Lekhnitskii’s complex variable method and complex potential *** genetic algorithm is then implemented to find the optimal values for design *** results show that by selecting the optimal parameters related to the anisotropic material and the opening’s geometry,the stress intensity factor of the perforated anisotropic plates is remarkably ***,this optimization algorithm can be extended to find the optimized parameters and achieve the optimal designs in anisotropic and isotropic perforated plates under thermal loadings.

关键词： Anisotropic materials Perforated plate Optimization Genetic algorithm Thermal stress Complex variable method Conformal mapping

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Improvement Control of a Three Axis Articulated Robotic Arm Using PID Cascade Control 11

Improvement Control of a Three Axis Articulated Robotic Arm ...

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11th International Conference on Cyber and IT Service Management, CITSM 2023

作者： Sutyasadi, Petrus Wicaksono, Martinus Bagus Maneetham, Dechrit Sanata Dharma University Faculty of Vocational Study Mechatronics Department Yogyakarta Indonesia Rajamangala University of Technology Thanyaburi Mechatronics Engineering Pathum Thani Thailand

ISBN: (纸本)9798350305968

In the era of Industry 4.0, the demand for flexibility in automation is getting higher and higher. The industrial robotic arm is considered the most flexible tool in the automation process. Vocational schools should prepare their students to be ready to work with industrial robots. However, the price of an industrial robot is still very expensive. This problem becomes a barrier in preparing the manpower in the robotic field. This research investigated the potential of making an industrial robot trainer module using a 3D printer. Besides supporting the flexibility of the robotic design, the robot became much cheaper compared to the commercial one. The 3D-printed robotic arm may have less accuracy, repeatability, and reliability than branded robots, but it can be used to teach the student of basic operation of a robotic arm. An Arduino board is implemented to control the arm. Cascade PID Controller was implemented on the Arduino to control the robot joins. The result shows satisfactory robot performance. The cascade PID Controller can control the robot joints in a good way. © 2023 IEEE.

关键词： Industrial robots

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Design of Wireless Cloud-Based Transmission Intelligent Robot for Industrial Pipeline Inspection and Maintenance 1

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1st International Conference on Expert Clouds and Applications, ICOECA 2023

作者： Arockia Dhanraj, Joshuva Damodaran, Gokula Vishnu Kirti Balaji, C.R. Jha, Swati Venkatasamy, Ramkumar Srinivasan, Janaki Raman Lingampally, Pavan Kalyan Department of Mechatronics Engineering Hindustan Institute of Technology and Science Tamil Nadu Chennai603103 India

ISBN: (数字)9789819917457

ISBN: (纸本)9789819917440

With the rapid increase in industries and trade, the worldwide usage of pipelines has increased exponentially. It is essential that these pipelines can be maintained properly and should be inspected for leakage, cracks, and proper welding after the installation. It is hard for humans to manually inspect the pipeline for the larger distances and to work in hazardous situations which makes it a cumbersome task and especially pipelines with varying sizes and diameters make the task an even more impossible one to implement, so replacement of the pipeline becomes the only viable solution. This solution is not only a waste of manpower, time, and money but also a highly unsustainable usage of raw materials. Keeping this problem in mind, a robot named PIPELINE360 has been developed. This robot functions based on the Non-Destructive Testing (NDT) method of inspection and the self-adjustable mechanically designed structure, which can be used for the inspection of the pipelines with minimum 440 mm–maximum 1270 mm variation in diameter. It can give the live visual feed of the pipeline and is also facilitated to check for the internal and external cracks in the walls and the welded joints of the pipeline through non-contact Ultrasonic Testing. The operation of the said robot can be controlled using wireless cloud-based transmission system. There can be a reduction in the manpower, cost of maintenance, and time consumption for the inspection with the use of this robot. © 2023, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Nondestructive examination

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Single-Stage Single-Phase Current Source Inverter for Standalone Applications 50

Single-Stage Single-Phase Current Source Inverter for Standa...

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50th Annual Conference of the IEEE Industrial Electronics Society, IECON 2024

作者： Sohail, Umer Blinov, Andrei Østrem, Trond Hoff, Bjarte Carvalho, Edivan Laercio Department of Electrical Engineering UiT The Arctic University of Norway Narvik Norway Department of Electrical Power Engineering and Mechatronics Tallinn University of Technology Tallinn Estonia

ISBN: (纸本)9781665464543

The current source inverters (CSI) are considered more reliable than their voltage source counterparts due to the inherent current-limiting feature. This is particularly interesting for many applications, such as battery energy storage, where there is a possibility of very high short-circuit currents. In addition, CSI can provide an inherent voltage boost capability, allowing integration of extra-low voltage batteries with 230 Vac loads for standalone applications. For the past few years, CSI has not garnered much attention due to the unavailability of switches with reverse voltage blocking capability. However, with the emergence of new technologies based on wide bandgap materials and monolithic devices, CSI can potentially provide effective solutions for such applications. In this paper, a CSI is proposed as an interface between a ±48 V battery bank and a 230 Vac load. To minimize the forward voltage-drop across the switches of the current source inverter, silicon carbide MOSFETs-based four-quadrant switches are employed. In addition, a unipolar carrier-based modulation is proposed and implemented. This modulation technique facilitates easier control of overlap-time and minimizes its effect on the power quality output of the inverter. To validate this proposal, a 700 W prototype was built, and laboratory tested. © 2024 IEEE.

关键词： MOSFET devices

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A Comprehensive Study on Fast Charging in Smart Phones 5

A Comprehensive Study on Fast Charging in Smart Phones

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5th International Conference on Mobile Computing and Sustainable Informatics, ICMCSI 2024

作者： Manoharan, S. Mahalakshmi, B. Ananthi, K. Agalya, A. JCT College of Engineering and Technology Department of Electrical and Electronics Engineering Coimbatore India Hindusthan College of Engineering and Technology Department of Physics Coimbatore India Sri Krishna College of Engineering and Technology Department of Mechatronics Engineering Coimbatore India Department of Biomedical Engineering Rathinam Technical Campus Coimbatore India

ISBN: (纸本)9798350395235

A mobile charger is a handy device that enables users to replenish the battery of their electronic gadgets. Mobile phone chargers play a vital role in the functionality of mobile phones. As the market introduces new and advanced smartphones, consumers have become increasingly mindful of their chargers. When a consumer sets out to buy a mobile charger, they primarily seek one that is compatible with their mobile phone. Nevertheless, a mobile charger can also effectively recharge other devices like media players, digital cameras, or Personal Digital Assistants (PDAs). In order to provide power to portable gadgets like laptops and smartphones, mobile phones are often powered by a stable energy source that has the required pressure limit and a control circuit to maintain a constant current. The increasing focus on fast charging and the rising popularity of top-of-the-line smartphones have both played a significant role in driving the demand for mobile phone chargers. There are multiple reasons for the growth of the market, including the advancement of fast charging technologies, the greater use of internet services by smartphone users, and the increasing desire for new high-end smartphones. This research study investigates various aspects related to USB charging standards, different types of mobile phone chargers, and energy-saving fast charging standards. © 2024 IEEE.

关键词： Smartphones

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Research on Equivalent Wind Load Spectrum Acquisition and Remaining Fatigue Strength Method of Double Active Arm Type Holding Pole 8th

Research on Equivalent Wind Load Spectrum Acquisition and Re...

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8th International Conference on Advances in Construction Machinery and Vehicle engineering, ICACMVE 2023

作者： Liu, Wenwu Zhang, Hongsheng Lu, Nianli College of Engineering Northeast Agricultural University Heilongjiang Harbin150030 China School of Mechatronics Engineering Harbin Institute of Technology Heilongjiang Harbin150001 China

ISBN: (纸本)9789819718757

In order to study the wind load fatigue residual strength in in-service holding poles for preventing disasters, and improving load-bearing capacity reliability. Firstly, using the Davenport wind speed spectrum to simulate the wind speed, it will be the input load of the finite element dynamics model of the 2 × 40 kN double active arm type holding pole (DAATHP). The stress time history curve at the welding section of the main chord at the bottom of the tower shaft is obtained at the working condition with the wind angle of 0°, 45°, 90°, and 135°. The rain flow counting method derives the statistical characteristics of the mean, amplitude, and frequency of stress at four wind angles. Secondly, the frequency of wind load under four wind angles is extended, and the synthesized fatigue load spectrum is used as the equivalent wind load spectrum. Finally, the Paris-Eadogan equation is used to derive the calculation formula of fatigue residual strength of the main chord at the bottom of the tower shaft, and the functional function of the main chord is established and then the failure probability formula is derived by combining the equivalent wind load spectrum. It is found that, compared with the ANSYS calculation results, the error of the predicted stress spectrum of the proposed method is minor, only 7.95%. It is verified that the proposed method can efficiently obtain the equivalent load spectrum of the DAATHP. The results indicate that it is feasible and practical to apply the proposed method to calculate the remaining fatigue life of the DAATHP. © The Author(s) 2024.

关键词： Poles

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A Systematic Review on Solar-Driven Interfacial Evaporation for Desalination 1

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1st International Conference on Fluid, Thermal and Energy Systems, ICFTES 2022

作者： Ondiko, Jackson Hoffmann, Jaap Sebitosi, Ben Ashish Chandran, K. Sujith Kumar, C.S. Department of Mechatronics and Mechanical Engineering Stellenbosch University Matieland7602 South Africa Department of Mechanical Engineering National Institute of Technology Calicut Kozhikode India

ISBN: (数字)9789819959907

ISBN: (纸本)9789819959891

Traditional literature reviews and state-of-art approaches have been a center of attention in assessing the progress of solar-driven interfacial evaporation for desalination (SDIED). Moreover, these approaches focused on the development of photothermal materials, structural design, and salt-resistant strategies. However, a quantitative analysis review on the progress of surface temperature, evaporation rate, and efficiency of the photothermal structure has scarcely been reported. Considering the quality, reliability, and transparency, a systematic review method was adopted in this study to quantitatively analyze the variables stated. The articles from 2016 to 2021 were considered for this review. The average surface temperature, evaporation rate, and efficiency determined were 44.68 °C, 1.53 kg m−2 h−1, and 83.95%, respectively, over 5 years of study. Moreover the higher the surface temperature of the solar absorber, the lower the evaporation rate and efficiency was realized. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd 2024.

关键词： Surface temperature

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