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61st Annual Conference of the Society of Instrument and Control Engineers of Japan, SICE 2022

作者： Ikeda, Takuma Shibuya, Takeshi University of Tsukuba Master's Program in Intelligent and Mechanical Interaction Systems Ibaraki Japan University of Tsukuba Faculty of Engineering Information and Systems Ibaraki Japan

ISBN: (数字)9784907764784

ISBN: (纸本)9784907764784

In cooperative multi-agent systems, efficient coordination among agents is important when accomplishing tasks. VFFAC is a method that learns the communication system between agents and their interactions with the environment to obtain policies with high performance. However, this method results in decreased performance of policy in environments with a delay in communication. Furthermore, there is no formulation of the control problem of a cooperative multi-agent system with communication delays in unknown environments. In this study, we formulated a decision-making problem in a cooperative multi-agent system with an unknown environment model and a certain length delay in communication. We also propose a method to handle communication delays by using the history of information obtained through communication. We demonstrated that the proposed method successfully learns policy with high rewards through simulated experiments in an environment with a communication delay. © 2022 The Society of Instrument and Control Engineers - SICE.

关键词： Reinforcement learning

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Reinforcement Learning to Efficiently Recover Control Performance of Robots Using Imitation Learning After Failure

Reinforcement Learning to Efficiently Recover Control Perfor...

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2022 IEEE International Conference on Systems, Man, and Cybernetics, SMC 2022

作者： Kobayashi, Shoki Shibuya, Takeshi University of Tsukuba Master's Program in Intelligent and Mechanical Interaction Systems Ibaraki Japan University of Tsukuba Faculty of Engineering Information and Systems Ibaraki Japan

ISBN: (数字)9781665452588

ISBN: (纸本)9781665452588

Extreme environments, such as space and underwater, are difficult for humans to enter because they involve risks, hence it is necessary to employ autonomous robots instead of humans. When robots fail in extreme environments, it is essential for the robot to automatically recover control following the rules of failure because humans cannot repair the robot directly. Reinforcement learning is expected to automatically acquire the control rule;however, the retrieval of the control rule requires significant trial-and-error. Imitation learning cannot acquire the control rule if no suitable expert data exist. Methods combining imitation learning and reinforcement learning reduce the number of trial-and-errors;however, they are still not effective against robot failure because these methods cannot utilize expert data effectively. This paper proposes a reinforcement learning method that efficiently recovers control performance from failures by utilizing both the control rules prepared by the designer and multiple discriminators to calculate measures similar to expert data. Experimental results show that the proposed method recovers the control performance with fewer episodes than the conventional method. The main contribution of the proposed method is its efficiency against robot failure through utilizing expart data prepared for failure by the designers for imitation learning. © 2022 IEEE.

关键词： Reinforcement learning

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Experimental Study on Vibration Displacement for Coaxial Counter-Rotating Rotors 7

Experimental Study on Vibration Displacement for Coaxial Cou...

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7th International Conference on mechanical Manufacturing and Industrial engineering, MMIE 2024

作者： Sung, Chen-Yu Shieh, Tzong-Hann Ma, Yen-Huai Soong, Chyi-Yeou Yeh, Chun-Liang Huang, Yen-Er Ph.D. Program of Mechanical and Aeronautical Engineering Feng Chia University No.100 Wenhwa Rd. Seatwen Taichung40724 Taiwan Department of Aerospace and Systems Engineering Feng Chia University No.100 Wenhwa Rd. Seatwen Taichung40724 Taiwan Master's Program of Space Systems Engineering Feng Chia University No.100 Wenhwa Rd. Seatwen Taichung40724 Taiwan

ISBN: (数字)9781510683297

ISBN: (纸本)9781510683280

This paper uses the transmission mechanism of a coaxial counter-rotating rotorcraft equipped with blade designs of different airfoils. The blades are all made of aluminum alloy 6061T6. To study the deformation of the aluminum alloy blades of the rotorcraft when it hovers. It investigates the deformation and vibration displacement of the blade under the influence of aeroelasticity under the condition of fixed angle of attack and different rotation speeds. The airfoils used for study mainly consider the NACA0012 symmetrical airfoil and the other improved design Viper-X asymmetrical airfoil (A0) as test objects. The angle of attack used in the study is 10°, and the rotational speeds used are medium rotational speed ranges such as 400rpm, 450 rpm, 500 rpm, 550 rpm, and 600 rpm. A non-contact laser displacement sensor was used as the experimental measurement method for data measurement in this study. Finally, when the rotational speed exceeds 500rpm, the improved design of the asymmetric airfoil A0 is indeed more stable than the symmetrical airfoil NACA0012. © 2024 SPIE.

关键词： Aeroelasticity

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Experimental Study on Aerodynamic Effects of Different Blade Types with PIV-Method for Coaxial Counter-Rotating Rotors 7

Experimental Study on Aerodynamic Effects of Different Blade...

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7th International Conference on mechanical Manufacturing and Industrial engineering, MMIE 2024

作者： Sung, Chen-Yu Shieh, Tzong-Hann Ma, Yen-Huai Soong, Chyi-Yeou Yeh, Chun-Liang Yang, Fuh-Sen Ph.D. Program of Mechanical and Aeronautical Engineering Feng Chia University No.100 Wenhwa Rd. Seatwen Taichung40724 Taiwan Department of Aerospace and Systems Engineering Feng Chia University No.100 Wenhwa Rd. Seatwen Taichung40724 Taiwan Master's Program of Space Systems Engineering Feng Chia University No.100 Wenhwa Rd. Seatwen Taichung40724 Taiwan

ISBN: (数字)9781510683297

ISBN: (纸本)9781510683280

This paper is about the PIV experimental study on aerodynamics of a coaxial counter-rotating rotors aircraft. The main purpose is to observe and record the flow field distribution of the coaxial counter-rotating rotors when hovering, and to determine the rotor blade profile design for stable flight. The experimental method is to observe the flow field coupling effect of coaxial counter-rotating rotors with flow field visualization technology. This study uses the blade S-0 improved by the symmetrical airfoil NACA0012 and the blade AS-0 improved by the asymmetrical airfoil Viper-X to conduct flow field observation experiments. In order to survey the aerodynamic characteristics of blade configurations in the flow field under different flight conditions. This study also conducted experiments on conditions such as low and medium rotational speed at high angles of attack, medium and high angles of attack at high rotational speed. The experimental results show that the flow field of the blade S-0 has a relatively stable flow field characteristics at low rotational speed. But when the rotational speed increases and the angle of attack becomes higher, the flow field stability of the blade AS-0 is better. Finally, the flow field of blade AS-0 is more stable than the flow field of blade S-0 under most flight conditions. Therefore, blade AS-0 is more suitable for assembly on coaxial counter-rotating rotors. © 2024 SPIE.

关键词： Angle of attack

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Toward Learning Factory for Industry 4.0: Virtual Reality (VR) for Learning Human–Robot Collaboration 1

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International Conference on Innovative Technologies in Intelligent Systems and Industrial Applications, CITISIA 2022

作者： Ariansyah, Dedy Colombo, Giorgio Pardamean, Bens Bioinformatics and Data Science Research Centre Bina Nusantara University Jakarta11480 Indonesia Department of Mechanical Engineering Politecnico di Milano Milan20156 Italy Computer Science Department BINUS Graduate Program Master of Computer Science Program Bina Nusantara University Jakarta11480 Indonesia

ISBN: (数字)9783031290787

ISBN: (纸本)9783031290770

Industry 4.0 will bring not only transformation to the manufacturing technologies but also to the profile of the workforce. Education system should be revised to prepare the future graduates embracing the knowledge of the ongoing revolution. Initiatives on the modification of curriculum and tools to deliver the concepts of Industry 4.0 must be taken. This paper examines limitations of current engineering tools and proposes a virtual reality (VR)-based learning platform to support the teaching and learning activity for Industry 4.0, focusing on the design of Human–robot Collaboration (HRC). The development process began with the identification of the general Intended Learning Outcomes (ILOs) which were extracted from the review of the HRC design issues, followed by the evaluation of the current teaching tool. From these results, the new requirements of the tools to achieve ILOs are redefined. The implementation of the system is demonstrated to show the feasibility of the proposed learning platform. This workflow can serve as initial development of another learning platform for the other innovative concepts that form the building blocks of Industry 4.0. © The Author(s), under exclusive license to Springer Nature Switzerland AG 2023.

关键词： Industry 4.0

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Loss Balancing for Physics-Informed Neural Networks Considering Procedure for Solving Partial Differential Equations

Loss Balancing for Physics-Informed Neural Networks Consider...

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International Symposium on Soft Computing and Intelligent Systems (SCIS)

作者： Manabu Kojima Kazuma Otsuki Masato Suzuki Masajiro Abe Masaaki Baba Kazuya Yokota Master's Program in Mechanical Engineering Nagaoka University of Technology Nagaoka Japan Department of System Safety Engineering Nagaoka University of Technology Nagaoka Japan Department of Mechanical Engineering Nagaoka University of Technology Nagaoka Japan

ISBN: (数字)9798350373332

ISBN: (纸本)9798350373349

With the development of machine learning, numerical analysis using neural networks has been devised. Remarkably, physics-informed neural networks (PINNs) enable physically consistent numerical analysis by introducing a loss function that conforms to relevant governing equations. Moreover, research is rapidly advancing for the application of PINNs to inverse analysis in areas such as physical property identification. For a PINN to learn governing equations, the weights of the loss functions should be properly determined because they have different roles in components such as boundary conditions, initial conditions, and governing equations. However, weight setting is generally challenging. We propose a loss balancing method considering the procedure for solving partial differential equations. The proposed method is validated through comparisons with conventional solvers.

关键词： Training Heating systems Numerical analysis Partial differential equations Neural networks Manuals Machine learning Object recognition MATLAB Convergence

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Study on In-clothes Body Weight Support System to Support Treating and Recovering Knee Arthopathy

Study on In-clothes Body Weight Support System to Support Tr...

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2022 IEEE International Conference on Systems, Man, and Cybernetics, SMC 2022

作者： Netsu, Kohki Kawamoto, Hiroaki Sankai, Yoshiyuki Univetsity of Tsukuba Master's Program in Intelligent and Mechanical Interaction Systems Ibaraki Japan University of Tsukuba Faculty of Engineering Information and Systems Center for Cybernics Research Ibaraki Japan

ISBN: (数字)9781665452588

ISBN: (纸本)9781665452588

Patients with knee arthropathy suffer from pain owing to damage at the knee joint cartilage and experience difficulty in walking as the condition worsens. As one of treatments of knee arthropathy, an implantation of cellular cartilage has been performed. After implantation of cellular cartilage, the knee joint should avoid overweight to prevent cell damage form body weight and apply appropriate mechanical stress to articular cartilage to promote cartilage regeneration. Therefore, a weight support system which can adjust the amount of weight in everyday use is required. This study aims to develop an in-clothes body weight support system to protect the knee joint during daily walking to support knee arthropathy treatment and recovery in regenerative medicine, and confirm basic performance of the system through experiments with able-bodied person. The system had frame structure with two-node link from the groin to the foot with the user's knee joint as the center of rotation. It consisted of load-bearing seat, height adjustment mechanism, thigh cuff, mechanical knee joint, and, ground reaction force sensor shoes, and was designed to be sufficiently thin to fit inside clothes. In the 10-Meter walking test, the system could adjust the amount of supporting weight and support two-thirds, one-half, and one-third of total body weight of an able-bodied participant during walking. In conclusion, we confirmed that the developed system had basic performance of weight support. © 2022 IEEE.

关键词： Cartilage

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Design of small single cylinder 4 stroke spark ignition engine for electric generator with flexible fuel: Biogas, liquefied petroleum gas (lpg) or gasoline 11th

Design of small single cylinder 4 stroke spark ignition engi...

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11th International Conference on Materials and Manufacturing Technology, ICMMT 2020

作者： Lie, David Nindhia, Tjokorda Gde Tirta Surata, I. Wayan Wirawan, Nengah Master student at Study program of M aster in Mechanical Engineering Engineering Faculty Udayana University Jimbaran Bali Indonesia Study Program of Mechanical Engineering Engineering Faculty Udayana University Jimbaran Bali Indonesia

ISBN: (纸本)9783035737226

The available of conventional fuels are fluctuating depend on distribution from the source production to consumer. The availability of biogas as renewable energy is increasing due to establishments of many organic wastes processing worldwide. The need of electricity to support daily life activity is a must, but the availability of electric source in remote area is limited especially for a farm that far away from commercial line distribution of electricity. This work is dedicated to solve this problem. The single cylinder 4 stroke spark ignition engine (83 cc) was designed to be able to be fuelled flexibly by using biogas or liquefied petroleum gas (LPG), or gasoline if sometime the biogas not available during initiation of the process or during maintenance of anaerobic digester. The engine is still can be run to provide electricity by using conventional fuel such as LPG or gasoline. The full consumption as well as emission of this flexible fuel engine was investigated. It is found that the fuel consumption is 9.97 L/mint for Biogas, 0.004 L/mint for gasoline and 2.24 L/mint for LPG. Surprisingly by using biogas the emission of carbon monoxide (CO) was down to almost zero (0.02 ppm), comparing gasoline 0.32 ppm, and LPG 0.4 ppm. © 2021 Trans Tech Publications Ltd, Switzerland.

关键词： Gasoline

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Influence Analysis of the Acoustic Radiation Characteristics of Circular Hole in Headphone Using Specific Flow Resistance

Influence Analysis of the Acoustic Radiation Characteristics...

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IEEE International Conference on Consumer Electronics-Taiwan (ICCE-TW)

作者： Tzu-Hsuan Lei Shu-Chien Wu Kuang-Che Lo Shu-Chi Liu Yu-Cheng Liu Ph.D. Program of Mechanical and Aeronautical Engineering Feng Chia University Taichung City Taiwan Master Program of Electro-Acoustics Feng Chia University Taichung City Taiwan

ISBN: (数字)9798350386844

ISBN: (纸本)9798350386851

The geometric dimensions of vent holes in headphone products are key to the impedance characteristics of sound wave propagation and, in turn, affect the low-frequency acoustic performance. However, qualitative and quantitative research on this topic is still insufficient. Therefore, we studied headphone rear chamber vent hole, with a diameter and depth of 1.0 mm and 2 mm, respectively. The acoustic specific airflow resistance of the vent hole was measured using a self-made system that consists of a differential pressure meter and a flow controller. Then, the results were input into the model for correction, to complete the verification between finite element simulation and measurements. The results showed that simulations corrected with the specific airflow resistance measurements of vent hole in the headphone chamber not only enhance the accuracy of low-frequency simulations, but also effectively reduce the error, with maximum discrepancy between simulation and measurement decreasing from 1.3% to 0.063%.

关键词： Resistance Headphones Ventilators Atmospheric modeling Vents Acoustic measurements Acoustics

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Study on the Predictions of Acoustic Characteristics of Microspeakers Based on the Specific Airflow Resistance of Ventilation Materials: Mesh Type

SSRN

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SSRN 2024年

作者： Lei, Tzu-Hsuan Liu, Yu-Cheng Ph.D. Program of Mechanical and Aeronautical Engineering Feng Chia University Taichung40724 Taiwan Master Program of Electro-Acoustics Feng Chia University Taichung40724 Taiwan

In this study is presented a method for predicting the acoustic characteristics of microspeakers with mesh-type ventilation materials that combines specific airflow resistance with equivalent circuit model. The specific airflow resistances of eight types of ventilation materials were quantified using a self-made measurement system. These materials were then used to simulate the acoustic properties of 40 φ and 20 φ microspeakers, respectively. The results were compared with simulation results obtained using Dr. Maa's porous plate acoustic impedance and actual measurements. After applying a stable correction factor, the self-made measurement system accurately determined specific airflow resistance values with high reproducibility and stability. A regression curve based on scanning electron microscope obtained porosity and measured specific airflow resistance effectively predicted the specific airflow resistance of materials with known porosity. Applying these values to acoustic simulations, the proposed method significantly improved accuracy, outperforming Dr. Maa's method by a factor of six, and closely matched actual measurements. This innovative approach is versatile and applicable to various conditions and types of ventilation materials, as well as enhances predictions of their impact on electro-acoustic product performance. © 2024, The Authors. All rights reserved.

关键词： Porosity

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