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Detecting Crack on a Beam Subjected to Impact Load

Detecting Crack on a Beam Subjected to Impact Load

AUN/SEED-Net Joint Regional Conference in Transportation, Energy, and mechanical Manufacturing engineering, RCTEMME 2021

作者： Gunawan, Fergyanto E. Huu Nhan, Tran Sutikno Kamil, Insannul Industrial Engineering Department BINUS Graduate Program Master of Industrial Engineering Bina Nusantara University Jakarta11480 Indonesia Department of Automotive Engineering Faculty of Transportation Engineering Ho Chi Minh City University of Technology Ho Chi Minh City Viet Nam Mechanical Engineering Department Faculty of Engineering Institut Teknologi Sepuluh Nopember Surabaya Indonesia Industrial Engineering Department Faculty of Engineering Andalas University Padang Indonesia

ISBN: (纸本)9789811919671

Crack often affects structural deformation nonlinearly, leading to difficulty detecting their existence using some Structural Health Monitoring methods. In this paper, we propose a damage index derived from the Euler-Bernoulli beam theory. Furthermore, we evaluate the method's ability to detect the crack when the specimen is subjected to an impact load. To assess the proposed damage index, we consider a beam specimen containing a lateral crack. The beam has a length of 300 mm and a square-shaped cross-sectional area of 20 mm × 20 mm. The beam is made of steel, is constrained at one end, and is subjected to an impact load at the other end. The beam lateral displacement at many observation points across the beam-free surface is recorded during the beam dynamics. The records are used to compute the proposed damage index. The results suggest that the index only detects the crack when the beam deformation is affected by the crack. When the crack face is suppressed to bear the compressive stress, the resulting deformation is not much different from that of the uncracked beam. In that condition, the proposed index is not able to indicate the existing crack. © 2022, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Cracked beam Damage index Euler-Bernoulli beam Lateral deformation Structural health monitoring

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Thermal Performance of a Heat-Pipe Evacuated-Tube Solar Collector 2nd

Thermal Performance of a Heat-Pipe Evacuated-Tube Solar Coll...

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2nd International Conference on Experimental and Computational Mechanics in engineering, ICECME 2020

作者： Septiadi, Wayan Nata Wirawan, I. Ketut Gede Yoga, I. Putu Agus Saskara Putra, Gerardo Janitra Puriadi Lazuardy, Sulthan Alif Ramadhan Department of Mechanical Engineering Udayana University Kampus Bukit Jimbaran Badung Bali80361 Indonesia Master Program of Mechanical Engineering Udayana University Kampus Sudirman Denpasar Bali Indonesia Bachelor Program of Mechanical Engineering Udayana University Kampus Bukit Jimbaran Badung Bali Indonesia

ISBN: (纸本)9789811607356

The heat pipe solar water heater utilizes an evaporator to capture heat which is then used to heat water in the condenser section. The greater the heat that is able to be absorbed on the evaporator, can improve the overall performance of the solar water heater. Fins are added to the evaporator to increase the heat absorption area, but the shape of the fins can also affect the amount of heat absorbed. This research was conducted to determine the effect of fin shape on heat absorption in the evaporator section. Fins on the evaporator are made in a circular and flat shape with a width of 43 mm, a length of 516 mm for a flat fin and a diameter of 43 mm totaling 50 for a circular fin. From the test results it was found that the circular fin can reduce thermal resistance 43.48% greater than the flat fin and 9.89% of the solar water heater heat pipe without fins. © 2021, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Heat pipe Solar collector Vacuum tube

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Using a Composite Catalyst in the Gasification Process, In-Situ Plastic Waste is Converted to Energy

SSRN

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SSRN 2023年

作者： Abdelrahman, Ameen Nedil, Mourad Erchiqui, Fouad Material science Département School of Engineering Canada Mechanical Engineering Department Université du Québec en Abitibi-Témiscamingue Canada Master of Engineering Program School of Genius Canada

The world is eager to find a solution to reduce the phenomenon of climate change and transition to sustainable and renewable resources in all facets of our lives as we live in this period. Climate change and the emission of greenhouse gases are closely related issues. In that study, we focused on finding ways to reduce municipal management of plastic solid waste and conversion to enhance gases and solid carbon instead of direct incineration or disposal. In order to fracture a variety of plastic debris (PEHD, PELD, PVC, and PS) in a fixed bed reactor system, we created composite materials made of three transition metal oxides (manganese, titanium, and iron). These materials were built using layers of bentonite clay. To enrich and improve gas yields and product quality, the gasification reaction has been set up with customizable, parameter-optimized heating rate, loading, and reaction time settings. For the distribution of composites and products, many characterization techniques including XRD, TEM, SEM, GC, and EDX have been used (gas yield, and char weight ratio). © 2023, The Authors. All rights reserved.

关键词： Climate change

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Evaluating AI-Induced Anxiety and Technical Blindness in Healthcare Professionals 3

Evaluating AI-Induced Anxiety and Technical Blindness in Hea...

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3rd International Conference on Creative Communication and Innovative Technology, ICCIT 2024

作者： Christian, Michael Pardede, Ratlan Gularso, Kurnadi Wibowo, Suryo Muzammil, Oktafalia Marisa Sunarno University of Bunda Mulia Dept. of Management Jakarta Indonesia University of Bunda Mulia Master of Management Jakarta Indonesia Krida Wacana Christian University Dept. of Medical Profession Study Program Jakarta Indonesia Bina Nusantara University Dept. of Business Management School Dept. of Business Undergraduate Program Bekasi Indonesia University of Tama Jagakarsa Dept. of Mechanical Engineering Jakarta Indonesia

ISBN: (纸本)9798350367492

The widespread implementation of artificial intelligence (AI) in various industries, including healthcare, provides significant benefits but raises concerns. Notably, apprehensions about AI generating issues, experiencing malfunctions, and hindering work extend to fears of replacing medical professional positions. This research aims to quantitatively assess the impact of anxiety forms, specifically social, technical blindness and AI configuration, on job replacement anxiety among medical doctors. A pre-test approach was employed to gather data from 38 doctors in Jakarta who regularly interact with AI in their daily work. The study used PLS-SEM structural modelling with SmartPLS 3.0 as the analysis tool. Findings indicate that both social and technical blindness and AI configuration significantly influence job replacement anxiety. Additionally, the study reveals that elements within the AI configuration interact with social-technical blindness, and the AI setup effectively mitigates its impact on job replacement anxiety. These anxieties notably affect medical professionals' fears of being replaced in their current roles. Previous research shows that anxiety about AI among healthcare personnel is persistent. However, this worry can be reduced or eliminated through continuous awareness, education, and understanding of AI's purpose and limitations. This study aims to provide medical practitioners with a comprehensive understanding of AI constraints and the aspects requiring direct doctor involvement. © 2024 IEEE.

关键词： Artificial intelligence

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Method on utilization of low quality biogas as a fuel for 4 stroke spark ignition engine of electric generator 11th

Method on utilization of low quality biogas as a fuel for 4 ...

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

作者： Negara, I Gede Artha Nindhia, Tjokorda Gde Tirta Surata, I. Wayan Nindhia, Tjokorda Sari Shukla, Shailendra Kumar Master Student at Study Proram of Master in Mechanical Engineering Udayana University Denpasar Bali80361 Indonesia Study Program of Mechanical Engineering Engineering faculty Udayana University Jimbaran Bali80361 Indonesia Faculty of Veterinary Medicine Udayana University Denpasar Bali80113 Indonesia Departmen of Mechanical Engineering IIT Banaras Hindu University Varanasi221005 India

ISBN: (纸本)9783035737226

Biogas quality in many installation of anaerobic digester for processing organic waste are found not optimum, especially in developing country where understanding of anaerobic processing is not well known. The methane content in the biogas are usually low that make it not possible to be utilized as a fuel of the engine. Biogas Purification usually will be introduced as a solution. But this idea is about complicated for simple or small anaerobic digester. Other solution is suggested by using enrichment of biogas by using other fuel such as hydrogen or blended with city gas such as LPG gas. But for preparing hydrogen gas or commercial will also costly. This research introduces simple technique for biogas enrichment by using denatured alcohol. The biogas contents were found around 30% vol. methane (CH4) and around 2% Carbon dioxide (CO2). The price of denatured alcohol is relative cheap because the selling tax is not as much as drinking alcohol. Engine with bigger combustion (420 cc) chamber was prepared for this purpose to make possible to be fuelled with biogas. The compression was set to reach 10 bar. The clearance of the both intake and exhaust valve was set in order to be possible to be running by using biogas. The biogas-air mixer was design for this purpose. The carburetor was set for use of denatured alcohol. It is found that the engine is running well by using biogas fuel that is enriched by using denatured alcohol. The emission was found better comparing using gasoline for the same engine. The fuel consumption is reported for future economic analyses. © 2021 Trans Tech Publications Ltd, Switzerland.

关键词： Carbon dioxide

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Smart Dome 4.0: Low-Cost, Independent, Automated Energy System for Agricultural Purposes enabled by Machine Learning 2

Smart Dome 4.0: Low-Cost, Independent, Automated Energy Syst...

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2021 2nd International Symposium on Automation, Information and Computing, ISAIC 2021

作者： Budiman, Arief S Gunawan, Fergyanto Djuana, Endang Pardamean, Bens Romeli, Sugiarto Putri, Dianing Nn Aji, Daisman Pb Rahardjo, Kuat Stevanus Ilham Wibowo, M. Daffa, Nadiev Owen, Raymond Industrial Engineering Department BINUS Graduate Program - Master of Industrial Engineering Bina Nusantara University Jakarta Indonesia Department of Manufacturing and Mechanical Engineering and Technology Oregon Institute of Technology Klamath FallsOR97601 United States Electrical Engineering Department Faculty of Industrial Technology Universitas Trisakti Jakarta Indonesia Bioinformatics and Data Science Research Center Bina Nusantara University Jakarta Indonesia Computer Science Department BINUS Graduate Program - Master of Computer Science Bina Nusantara University Jakarta Indonesia PT. Impack Pratama Industri Tbk Jakarta Indonesia Mechanical Engineering Department Faculty of Industrial Technology Universitas Trisakti Jakarta Indonesia Industrial Engineering Department Faculty of Engineering Bina Nusantara University Jakarta Indonesia

Many economically essential crops in Indonesia (such as coffee, tea, chocolate, or copra) require storage or drying under certain environmental conditions, especially temperature and humidity. The solar dryer dome, typically used for agricultural purposes in Indonesia, produces a sufficient amount of heat to increase the evaporation rate inside the dome and reduce the moisture content of the commodity. A hybrid solar dryer accompanied by a photovoltaic panel, fan, and ventilation system is generally suitable. The system can provide an optimum environment with minimum control. However, as the outdoor temperature and humidity change dramatically, such as at night time, more control is required. Based on Industry 4.0 technologies, we have developed a new kind of hybrid solar dryer that provides an optimum environment 24/7. The system, called Smart Dome 4.0, is an intelligent, low-cost, self-sufficient drying and storage system to support Indonesia Agriculture 4.0. The system has a local power generation unit to self-sustain the required energy and operate without connecting to the electricity grid. The system utilizes a machine-learning algorithm to predict the environmental condition and optimally uses self-generated electric power. The developed Smart Dome 4.0 technology is critical to producing a sustainable solar dome under drastic environmental dynamics. © Published under licence by IOP Publishing Ltd.

关键词： Learning algorithms

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Study on Wearable Gaze-Based Communication System for Patients with Amyotrophic Lateral Sclerosis (ALS)

Study on Wearable Gaze-Based Communication System for Patien...

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IEEE/SICE International Symposium on System Integration

作者： Sawada Nonoka Akira Uehara Hiroaki Kawamoto Yoshiyuki Sankai Master's Program in Intelligent and Mechanical Interaction Systems University of Tsukuba Ibaraki Japan Institute of Systems and Information Engineering Center for Cybernics Research University of Tsukuba Tsukuba Ibaraki Japan

This study centers its attention on communication among ALS patients with severe symptoms, which is essential to daily life and the part that remains a difficulty. Also, communication is important to promote social participation and ability of independence. To promote social participation and improve the ability of independence without the restrictions for patients, the purpose of this study is to develop a wearable interface that enables communication based on the patient's voluntary intent, without temporal, spatial, or physical restrictions, and to confirm the feasibility of intention transmission using a new text entry algorithm. The developed interface utilized a see-through type head-mounted display (HMD) with a gaze estimation sensor to enable patients themselves to transition between cyberspace and physical space and to communicate by the system without restrictions of posture or usage environment during daily life activities. The letter selection is triggered by a change in the direction of the gaze trajectory. This method of letter selection reduces the burden on the user by avoiding the effects of dwell time and other factors associated with gazing input. The key layout for text input UI considers the characteristics of human eye movements, to minimize key selection errors and allows for quick viewpoint movement. To confirm the feasibility of the basic performance, we conducted the experiment with three able-bodied participants using the developed system and a conventional system as a comparison system, respectively. As a result, the developed system was able to input sentences in the same amount of time as the conventional system. The results show that the developed system has the basic performance of a communication interface with a new character input method based on eye movement functions. Therefore, we confirmed the feasibility of transmitting intention using a new text entry algorithm to enable communication without the restrictions.

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Application of level-set type topology optimization for defect topology identification analysis using hammering response data

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Materials Today: Proceedings 2023年

作者： Kurahashi, Takahiko Koike, Towa Kishida, Masayuki Murakami, Yuki Ikeda, Fujio Department of Mechanical Engineering Institute of GIGAKU Nagaoka University of Technology Niigata Nagaoka Japan Mechanical Engineering Master's Program Graduate School of Engineering Nagaoka University of Technology Niigata Nagaoka Japan Science of Technology Innovation 5-year Integrated Doctoral Program Graduate School of Engineering Nagaoka University of Technology Niigata Nagaoka Japan Department of Civil Engineering National Institute of Technology Nagaoka College Niigata Nagaoka Japan Department of Mechanical Engineering National Institute of Technology Nagaoka College Niigata Nagaoka Japan

In this study, we presented the defect identification analysis based on the level-set type topology optimization using hammering testing data. To simulate the oscillation behavior of concrete structure, the equation of motion in three dimensions is introduced as the governing equation. The performance function is defied by the time integral of the squared residual between the computed and observed displacements. The problem is to find the defect topologies so as to minimize the performance function. In the model with a small number of observation points, it was found that nonexistent defects disappeared by using the weighted sensitivity method. In addition, it was confirmed that the model with a large number of observation points did not show the same tendency as the model with a small number of observation points because the accuracy of defect identification increased as the number of observation points increased. © 2023

关键词： Defects

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Synergistic sodium alginate- and biochar-immobilized cells for enhancing fermentative hydrogen production from food waste

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Environmental Science and Pollution Research 2024年第56期31卷 64524-64533页

作者： Ngamnurak, Phonsini Plangklang, Pensri Pomdaeng, Prakaidao Ko, Ting-Wu Reungsang, Alissara Chu, Chen-Yeon Graduate School Khon Kaen University Khon Kaen40002 Thailand Department of Biology Technology Faculty of Technology Khon Kaen University Khon Kaen40002 Thailand Research Group for Development of Microbial Hydrogen Production Process From Biomass Khon Kaen University Khon Kaen40002 Thailand Institute of Green Products Feng Chia University Taichung Taiwan Ph.D. Program of Mechanical and Aeronautical Engineering Feng Chia University Taichung Taiwan Master’s Program of Green Energy Science and Technology Feng Chia University Taichung Taiwan Academy of Science Royal Society of Thailand Bangkok10300 Thailand

An immobilized hydrogen-producing consortium investigated biohydrogen production from food waste using a combination of sodium alginate and cassava rhizome biochar. We investigated the effect of varying the biochar concentration from 0 to 3% and the size of immobilized cells from 1 to 7 mm. Immobilized cells were prepared using 50% (v/v) enriched hydrogen-producing consortium, 2% (w/v) sodium alginate, and 0 to 3% (w/v) cassava rhizome biochar. The optimal conditions for achieving the highest hydrogen production in the batch fermentation reactor were identified as a biochar concentration of 2% (w/v) and an immobilized cell size of 2 mm. The highest hydrogen yield, maximum hydrogen production rate, and lag time recorded were 0.69 mmol H2/g-COD, 0.02 mmol H2/g-COD.h, and 41.51 h, respectively. This research highlights the potential of cassava biochar technology for efficient biohydrogen production from food waste, contributing to renewable energy generation and sustainable waste management. © The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature 2024.

关键词： Anaerobic digestion

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Carbon nitride- and graphene-based materials for the photocatalytic degradation of emerging water pollutants

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Materials Advances 2024年第7期5卷 2668-2688页

作者： Indra Jaya Budiarso Valentinus Alphano Dabur Riska Rachmantyo Hermawan Judawisastra Chechia Hu Arie Wibowo Master Program in Materials Science and Engineering Faculty of Mechanical and Aerospace Engineering Institut Teknologi Bandung Ganesha 10 Bandung 40132 West Java Indonesia Doctoral Program in Materials Science and Engineering Faculty of Mechanical and Aerospace Engineering Institut Teknologi Bandung Ganesha 10 Bandung 40132 West Java Indonesia Materials Science and Engineering Faculty of Mechanical and Aerospace Engineering Institut Teknologi Bandung Ganesha 10 Bandung 40132 West Java Indonesia ariewibowo@itb.ac.id Department of Chemical Engineering National Taiwan University of Science and Technology Taipei 106 Taiwan R&D Center for Membrane Technology Chung Yuan Christian University Taoyuan 320 Taiwan Research Center for Nanoscience and Nanotechnology Institut Teknolgi Bandung Ganesha 10 Bandung 40132 West Java Indonesia

Photocatalytic degradation is a promising way to treat emerging pollutants in wastewater. Recently, metal-free photocatalysts such as carbon nitride- and graphene-based materials have attracted much interest in the photocatalytic degradation of emerging water pollutants owing to their visible light activity and unique electrical properties, respectively. Graphitic carbon nitride (GCN) is considered a superior visible light–active photocatalyst because of its suitable bandgap (2.7 eV). Moreover, the facile synthesis process and the high chemical and thermal stability of GCN make it one of the research hotspots in photocatalytic wastewater treatment. Besides GCN, graphene and its derivatives are utilized to support main photocatalysts by enhancing their light absorption, pollutant adsorption, and photogenerated charge separation. Furthermore, the vast modification of these materials has promoted various outstanding performances in carbon nitride- and graphene-based photocatalysts in the application of pollutant degradation. In this review, we highlight recent developments in carbon nitride- and graphene-based photocatalysts (2018–2023), focusing on the strategies to improve the activity of GCN as a visible light–active photocatalyst and the role of graphene and its derivatives as supporting materials in wastewater pollutant remediation applications.

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