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Multi-quality prediction of injection molding parts using a hybrid machine learning model

International Journal of Advanced Manufacturing technology 2024年第11期131卷 5511-5525页

作者： Ke, Kun-Cheng Wu, Po-Wei Huang, Ming-Shyan Department of Mechatronics Engineering National Taiwan Normal University 162 Section 1 Heping E. Rd. 106 Taipei City Taiwan Department of Mechatronics Engineering National Kaohsiung University of Science and Technology 1 University Road Kaohsiung City 824 Taiwan

With the advantages of high efficiency and low manufacturing cost, injection molding is a primary method of polymer processing. However, comprehensive inspection of part quality is limited due to high costs of time, labor, and equipment, often hindering quality control. There is an urgent need to develop a rapid and low-cost inspection method that can perform various quality inspections on injection-molded parts. Accordingly, this study proposes a virtual measurement technique based on a multi-quality prediction neural network that combines with an autoencoder network (AE) and a multilayer perceptron network (MLP). The research focused primarily on extracting and reducing the dimension of captured data using machine perception, quality index, and automatic feature extraction technologies to aid the rapid training of a hybrid AE/MLP model. Experimental case studies demonstrated that the method instantly predicted the residual stress distribution, weight, and geometric dimensions of plastic parts, and the model prediction error (root mean squared error) was less than 5% of the total tolerance. In particular, the predicted residual stress distribution was highly similar to the actual image, providing a substitute for the actual measurement of the residual stress within the molded part. © The Author(s), under exclusive licence to Springer-Verlag London Ltd., part of Springer Nature 2023.

关键词： Residual stresses

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Effect of Coatings on Mechanical, Corrosion and Tribological Properties of Industrial Materials: A Comprehensive Review

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Journal of Bio- and Tribo-Corrosion 2024年第1期10卷 1-20页

作者： Okokpujie, Imhade P. Tartibu, Lagouge K. Musa-Basheer, Hameed O. Adeoye, A.O.M. Department of Mechanical and Mechatronics Engineering Afe Babalola University Ado Ekiti360001 Nigeria Department of Mechanical and Industrial Engineering Technology University of Johannesburg Johannesburg2028 South Africa

The implementation of coatings on industrial materials has a significant impact on their tribological, corrosion, and mechanical properties. This review examines the impact of coatings on these essential material properties, and the challenges of the implementation mechanisms are discussed. In industrial applications, coatings are essential for lowering friction, wear, and surface damage and enhancing the tribological performance of materials. The ability of several coating processes to improve the wear resistance and lubricity of materials is being investigated. Also, the study cuts across the review of literature on physical vapour deposition (PVD), chemical vapour deposition (CVD), and thermal spray coatings. Furthermore, using protective coatings can considerably increase the corrosion resistance of industrial items. The suitable coating materials and methods must be used to prevent corrosion over the long term effectively. Additionally, coatings significantly affect the mechanical qualities of industrial materials, such as toughness, strength, and hardness. Hard coatings like nitride-based coatings can considerably increase materials' surface hardness and wear resistance. Additionally, by mixing various materials with complementary qualities, tailored multilayer and composite coatings can improve mechanical capabilities. To customise coatings for particular applications, it is crucial to comprehend how coatings interact with industrial materials. Furthermore, challenges such as coating-substrate compatibility, durability, and cost-effectiveness are addressed to ensure the successful implementation of coatings in industrial applications. Overall, the review highlights the significant role of coatings in improving industrial materials’ tribological, corrosion, and mechanical properties and emphasises the need for further research and development in this field. © 2023, The Author(s), under exclusive licence to Springer Nature Switzerland AG.

关键词： Wear resistance

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FINANCIAL SAVINGS BASED SELECTION OF OPTIMAL BUSES AND CAPACITY FOR RPIs IN REDS

UPB Scientific Bulletin, Series C: Electrical Engineering an...

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UPB Scientific Bulletin, Series C: Electrical engineering and Computer Science 2024年第3期86卷 391-406页

作者： Lavanya, M. Srinivasan, G. Department of Mechatronics Engineering Sona College of Technology TAMILNADU SALEM636005 India Department of Electrical and Electronics Engineering MVJ College of Engineering Near ITPL Main Road Whitefield BENGALURU560067 India

The current research article suggests a framework to solve the Reactive Power Injections (RPIs) in Radial Electric Distribution Systems (REDS) using the Dingo Optimization Algorithm (DOA) to maximize Financial Savings (FSs). This article formulates the objective function by considering three significant factors: maximizing the reduction in Real and Reactive Power Losses (RRPL) while minimizing capacitor investment costs with weight factor considerations and adhering to bus voltage profile enhancement. Notably, this work does not employ a Sensitivity Based Index (SBI) to identify critical nodes for Reactive Power Injection (RPI). The emphasis lies on showcasing the Fitness Scores (FSs) achieved by the proposed method through Optimal Capacitor placement and sizing (OCPS) under three scenarios. Simulation results demonstrate the superior solutions in terms of maximum FSs, RRPL reduction, and minimal bus voltage deviations obtained by the proposed method. © 2024, Politechnica University of Bucharest. All rights reserved.

关键词： DC distribution systems

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Assistive Feeding System: Design and Evaluation 6

Assistive Feeding System: Design and Evaluation

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6th International Conference on Robotics and Automation in Industry, ICRAI 2024

作者： Jahangir, Usama Ali, Wajid Aamir, Muhammad Fahad Tiwana, Mohsin Islam Jabbar, Hamid College of Electrical and Mechanical Engineering National University of Sciences and Technology Department of Mechatronics Engineering Islamabad Pakistan

ISBN: (纸本)9798350355703

Old people and patients with limited or complete motor impairment had always face difficulty in their daily life task in which most important and frequent is eating meals, such people need assistant like nurse to feed them. In this paper we worked on an assistive feeding system based on 6 Degree of Freedom fixed base open-source robotic arm with active assistance. The manipulator is 3D printed by fused deposition modelling technique using PLA + material and a counterweight mechanism is introduced to reduce the motor torque requirements hence reducing the power consumption of the system. The system is divided into 2 sub-systems which are hybrid-vision system to get location of mouth of the person to feed and, scooping and delivery system which uses manipulator and control system to feed the food. The system is completely embedded on raspberry pi with wireless access for user and programmer. Finally, we discuss the results of our system and limitations in the methodologies used. © 2024 IEEE.

关键词： Robotic arms

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A LOW-COST PORTABLE ELECTRIC TOWING SYSTEM FOR WHEELCHAIRS: DESIGN AND PERFORMANCE ANALYSIS

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Xinan Jiaotong Daxue Xuebao/Journal of Southwest Jiaotong University 2024年第2期59卷 241-254页

作者： Thongkom, Sommart Boonraksa, Promphak Boonraksa, Terapong Department of Mechanical Engineering Bangkokthonburi University Thawi Watthana Bangkok10170 Thailand Department of Mechatronics Engineering Rajamangala University of Technology Suvarnabhumi Nontaburi 11000 Thailand School of Electrical Engineering Rajamangala University of Technology Nakhon Pathom Rattanakosin73170 Thailand

This study introduces a cost-effective portable electric towing system designed by researchers to facilitate mobility for individuals with lower limb disabilities. The system enables users to supplement their standard wheelchairs with an electric towing mechanism, enhancing the ease of movement at an affordable price point. After the design and construction phase, the system was tested to ensure functionality and performance. Testing criteria included a minimum user weight of 80 kg and a driving distance of at least 20 km per charge. The driving tests, conducted five times, occurred at the Seeniare Complex, Bangkokthonburi University (Nursing and Public Health Practice Center). Testing started by navigating a 3.5-m radius curve from a 15-km distance, simulating regular road conditions. Subsequently, the system’s ability to ascend a 1:12 gradient (in compliance with Thai accessibility standards) was evaluated. Additionally, the braking system was assessed to ensure that the electrically towed wheelchair could come to a static stop within a 10-m distance continuously along a 1:12 gradient without slipping or tipping. The results demonstrated compliance with specified standards on each occasion. Furthermore, cost comparison analysis with market-available electric wheelchairs revealed the lowest-priced towing system to be $382.16. User satisfaction evaluations indicated an overall satisfactory rating. This research underscores the potential of the developed electric towing system to significantly enhance mobility and independence for individuals with lower limb disabilities, offering a practical and cost-effective solution. Further studies and refinements could reinforce its efficacy and applicability in real-world scenarios, and upon analyzing the production costs, it can be seen that the towing kit developed is priced low, allowing people with low incomes to easily access assistive devices. © 2024 by the authors.

关键词： Wheelchairs

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Inrush Current Measurement and Modeling Practical Cases and Primary Methods 65

Inrush Current Measurement and Modeling Practical Cases and ...

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

作者： Tinno, Jan Markus Kutt, Lauri Parker, Martin Kulikov, Jan Jaanus, Martin Tallinn University of Technology Dept. of Electrical Power Engineering & Mechatronics Tallinn Estonia

ISBN: (纸本)9798350365771

This paper presents an experimental evaluation of a grid's capacitance's influence on the forming of inrush currents. The study is conducted on several number of typical LED devices using different types of voltage supplies. The results obtained show capacitance's accountable effect on the strength and the rising speed of the inrush currents. Considering the comparison between the power supplies used in the tests, assumptions can be made about the damaging results of inrush currents to LED devices in case of various situations. © 2024 IEEE.

关键词： Electromagnetic transients

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Investigation on PID controller usage on Unmanned Aerial Vehicle for stability control

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Materials Today: Proceedings 2022年 66卷 1313-1318页

作者： R. Sree Ezhil, V. S. Rangesh Sriram, B. Vijay, R. Christopher Yeshwant, S. Sabareesh, R.K. Dakkshesh, G. Raffik, R. Department of Mechatronics Engineering Kumaraguru College of Technology Tamilnadu Coimbatore India

PIDs (Proportional, Integral, Derivative) have gained widespread acclaim among the industrial and academic communities for their control applications ranging from temperature, flow, and pressure regulation to being the most precise controller, often praised for its stability. Because it is a futuristic notion, it is one of the most frequently discussed concepts in the subject of control engineering. They interpret a program's input and formulate the required result using proportional, integral, and derivative calculations. They calculate the error value as the difference between our desired output and the output generated by a system. The system is then used to formulate the appropriate output using proportional, integral, and derivative computations. PID controllers are outstanding devices when it comes to preserving stability. This research focuses on the effectiveness of PID controllers in preserving drone stability, as well as the fact that they are a simpler and less time-consuming controller system than controllers with complicated workings. © 2022

关键词： Three term control systems

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Study on leakage current suppression of photovoltaic inverters with filter circuits 2

Study on leakage current suppression of photovoltaic inverte...

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2nd International Academic Conference on Optics and Photonics, IACOP 2024

作者： Li, Xinjun School of Energy and Mechatronics Engineering Hunan University of Humanities Science and Technology Loudi417000 China

ISBN: (数字)9781510688827

ISBN: (纸本)9781510688810

The transformerless photovoltaic (PV) inverter systems can generate significant leakage current to the ground. Currently, the main methods to reduce leakage current are based on optimizing circuit topology and control methods. This paper, after analyzing the causes of ground leakage current, proposes a novel integrated common-mode and differential-mode filtering topology with a buffer circuit to reduce the leakage current in transformerless PV inverter systems. This solution can effectively reduce the system's ground leakage current. Through theoretical analysis and circuit simulation verification, it is shown that this topology can effectively reduce the leakage current of the transformerless PV inverters. © 2025 SPIE.

关键词： Photons

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Design and Optimization of 3D Geometry-Dependent Solid-State Sodium Ion Sensors for Wearable Sweat Sensing

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IEEE Sensors Journal 2025年第12期25卷 21109-21119页

作者： Tu, Aimin Lai, Kang Lai, Jiang He, Shasha Xiao, Longya Aw, Kean C. Gao, Jiao Jiang, Hongjie South China University of Technology Shien-Ming Wu School of Intelligent Engineering Guangzhou511442 China University of Auckland Department of Mechanical & Mechatronics Engineering New Zealand

The three-dimensional (3D) geometry of an ion-selective membrane (ISM) significantly impacts the practical performance of an ion-selective electrode (ISE), particularly regarding the ISE’s conditioning time, potential drift, and electrode reproducibility. To investigate the ISM geometry-dependent characteristics, a two-layer structure ISE was proposed, with the carbon electrode serving both as the conductive substrate and the ion-to-electron transducer. Based on this, approximately 100 sodium ion ISEs (Na+-ISEs) were fabricated using a scalable printing method, with ISM thicknesses ranging from 30 to 60 μm and surface areas varying from 3 × 3 to 5 × 5 mm2. Potentiometric and other electrochemical analyses were applied to characterize the ISEs. The results indicate that increases in ISE thickness and surface area reduce potential drift, while increases in ISE area specifically decrease conditioning time. ISEs with 45 μm thickness and 5 × 5 mm2 area exhibited optimal features, including highly linear sensitivity of 105 ± 5 mV/decade, electrode reproducibility within 30 mV, insensitive to typical ions in sweat, long-term stability with a low drift rate of 90 μV/h over 72 hours, and one-week repeatability. A sweat sensing patch with a single ISE is integrated with a wireless readout circuit, enabling real-time on-body monitoring of Na+ levels during various types of exercise, including rowing, running, badminton, and tennis. The results provide manufacturing guidance for adapting solid-state ISEs to be more versatile in various practical situations by altering the ISM geometry. © 2001-2012 IEEE.

关键词： Ion selective electrodes

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Dynamic Modeling and Experimental Verification of an RPR Type Compliant Paralle Mechanism with Low Orders

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Chinese Journal of Mechanical engineering 2024年第3期37卷 83-94页

作者： Shuang Zhang Jingfang Liu Huafeng Ding Yanbin Zhang School of Mechatronics Engineering Henan University of Science and TechnologyLuoyangHenanChina Faculty of Materials and Manufacturing College of Mechanical Engineering and Applied Electronics TechnologyBeijing University of TechnologyBeijingChina Key laboratory of advanced manufacturing technology Beijing University of TechnologyBeijingChina School of Mechanical Engineering and Electronic Information China University of Geosciences(Wuhan)WuhanChina Center of Machinery Equipment Advanced Manufacturing of Henan Province LuoyangChina

Efficiency of calculating a dynamic response is an important point of the compliant mechanism for posture *** modeling with low orders of a 2R1T compliant parallel mechanism is studied in the *** mechanism with two out-of-plane rotational and one lifting degrees of freedom(DoFs)plays an important role in posture *** on elastic beam theory,the stiffness matrix and mass matrix of the beam element are established where the moment of inertia is *** improve solving efficiency,a dynamic model with low orders of the mechanism is established based on a modified modal synthesis ***,each branch of the RPR type mechanism is divided into a ***,a set of hypothetical modes of each substructure is obtained based on the C-B ***,dynamic equation of the whole mechanism is established by the substructure assembly.A dynamic experiment is conducted to verify the dynamic characteristics of the compliant mechanism.

关键词： Compliant parallel mechanism Dynamic model Modal synthesis method Dynamic experiment

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