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Numerical analysis of general-vibration-based method for structural health monitoring

AIP Conference Proceedings 2020年第1期2227卷

作者： Fergyanto E. Gunawan Benfano Soewito Nico Surantha Tuga Mauritsius Nobumasa Sekishita 1Industrial Engineering Department BINUS Graduate Program - Master of Industrial Engineering Bina Nusantara University Jakarta Indonesia 11480 2Computer Science Department BINUS Graduate Program - Master of Computer Science Bina Nusantara University Jakarta Indonesia 11480 3Information Systems Management Department BINUS Graduate Program - Master of Information Systems Management Bina Nusantara University Jakarta Indonesia 11480 4Department of Mechanical Engineering Toyohashi University of Technology Toyohashi Aichi 441-8580 Japan

For damage detection, this research article discusses an easy-to-compute damage index derived from the governing dynamic of the structure that has potential practical application in Structural Health Monitoring (SHM). The research uses simplified structural models to explore the sensitivity of the index to damages, to compare the index performance with a traditional but popular damage detection method, and to understand the local/global predictive capability of the index. The research uses two simple models, namely, single- and two-degree-of-freedom systems. The results suggest that the damage index is local, that can only monitor damages occurring near the points of measurements, but it is sensitive to damages, unlike the natural frequency, which is global but less sensitive.

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Multi responses optimization of plastic injection molding for biodegradable polymers using Taguchi method and TOPSIS

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AIP Conference Proceedings 2019年第1期2097卷

作者： Nano Koes Ardhiyanto Eko Pujiyanto Cucuk Nur Rosyidi 1Master Program of Industrial Engineering Department Sebelas Maret University Indonesia 2Industrial Engineering Department Sebelas Maret University Indonesia

This study reports a simulation study to reduce the shrinkage and warpage of Poly Lactic Acid (PLA) by optimizing the injection molding parameters using the Taguchi-TOPSIS method. Solidwork software were used to creating a specimen modelling of car accessories (shark fin antenna) and then employing the infinite element software, Autodesk MoldFlow Adviser. The effect of injection parameters on the warpage and shrinkage of specimen were examined carefully. The simulation result shows that Taguchi-TOPSIS method provided an outstanding result for the optimization of injection parameters to produce minimum volumetric shrinkage. Orthogonal array design was using L9 of design experiment. The injection parameter of melt temperature was the most significant parameter that influences the warpage and volumetric shrinkage for car accessories (shark fin antenna). The results of this study indicated that the optimal level combination to get minimum shrinkage and warpage in the injection molding process are 25°C of mold temperature, 148°C of melt temperature, 0.7 s of injection time, and 8 s of cooling time. The optimum value of warpage and volumetric shrinkage rate are 0.9949 mm and 4.14 %.

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Consumption, power number, and power curve characteristic of water diesel fuel emulsion mixer

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AIP Conference Proceedings 2020年第1期2296卷

作者： Agus Sartomo Budi Santoso Ubaidillah 1Master Program of Mechanical Engineering department Sebelas Maret University Jl. Ir. Sutami Kentingan Surakarta Indonesia 3Agency for The Assessment and Application of Technology Puspiptek Serpong South Tangerang Banten Indonesia 2Mechanical Engineering Department Sebelas Maret University Jl. Ir. Sutami Kentingan Surakarta Indonesia

Investigations have been done on the consumption of electric power in the process of water-diesel fuel emulsion mixing. The mixing process has been carried out using a mixer equipped with a 4-blade impeller. The mixer and impeller are made of aluminum material, while the impeller shaft is made of stainless steel. The mixer has a cylindrical tube shape and has a volume of 450 ml. Emulsion fuels consist of 85%v diesel fuel and 15%v water. This emulsion fuel has a density property of 858.8 kg/m3 and a dynamic viscosity of 0.0547 Pa.s. The mixing process was carried out at 2,000 rpm mixing speed up to 8,000 rpm at 1,000 rpm intervals. The mixer is connected to an electric motor and inverter, so the mixing speed of the mixer can be adjusted. In this research, data of electric current and electrical voltage are taken at each variation of mixing speed. The experimental data show that the higher the mixing speed, the higher the electric current needed. Thus, electricity consumption also is higher. The highest electrical power consumption is at 8,000 rpm mixer speed, while the lowest power consumption is at 2,000 rpm rotation. Non- dimensional power number (Np) analysis was also carried out in this study. By calculating the Reynold number (Re) and the electric power consumption at each rotation of the mixer, the power number curve (Np) is obtained. This curve is used to predict the power consumption of a mixer with the same impeller shape.

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Effect of calcium and magnesium catalyst on pyrolysis kinetic of Indonesian sugarcane bagasse for biofuel production

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Energy Procedia 2019年 158卷 431-439页

作者： Yano Surya Pradana Daniyanto Muhamad Hartono Laras Prasakti Arief Budiman Chemical Engineering Department Faculty of Engineering Universitas Gadjah Mada Jalan Grafika No. 2 Yogyakarta 55281 Indonesia Polytechnic of LPP – Plantation Training Institute Jalan LPP 1A Yogyakarta 55222 Indonesia Chemical Engineering Department Applied Sciences Faculty Delft University of Technology Mekelweeg 2 2628 CD Delft Netherlands Master Program of Systems Engineering Faculty of Engineering Universitas Gadjah Mada Jalan Teknika Utara No. 3 Yogyakarta 55281 Indonesia Center for Energy Studies Universitas Gadjah Mada Sekip K1-A Yogyakarta 55281 Indonesia

The present study aims to investigate the effect of CaO and MgO as catalyst in pyrolysis of Indonesian sugarcane bagasse (SCB) for biofuel production. Prior to being used as raw material, SCB underwent acid washing to remove its inherent Ca and Mg content. Catalytic and non-catalytic pyrolysis experiment were performed in a fixed-bed reactor within a temperature range of 20-480 o C. Thermogravimetric Analysis was used to describe the mechanism of pyrolysis and one-step global model was employed to determine the reaction kinetics. Pyrolysis stage comprised of a rapid decomposition zone (260-340 o C) and slow decomposition zone (340-480 o C). TG curve confirmed that the endothermic cellulose decomposition and volatilization was more dominant than exothermic polymerization and aromatization of lignin. Moreover, CaO provided the highest reaction kinetics with the lowest reaction order compared with catalytic pyrolysis with MgO and non-catalytic process, both in rapid and slow zone. Differential Thermal Analysis (DTA) and Differential Thermal Gravimetric (DTG) corresponded to this by showing that the energy for decomposition in non-catalytic process and using MgO and without catalyst was higher than SCB0-Ca which gave the highest conversion rate. Hence, this study shows that the addition of CaO as catalyst can improve the kinetics of SCB pyrolysis.

关键词： pyrolysis Indonesian sugarcane bagasse catalyst thermogravimetric reaction kinetic

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Glucose to Levulinic acid, a versatile building block chemical

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AIP Conference Proceedings 2020年第1期2296卷

作者： Meutia Ermina Toif Muslikhin Hidayat Rochmadi Arief Budiman 1Chemical Engineering Department Faculty of Engineering Universitas Gadjah Mada Jalan Grafika No. 2 Yogyakarta 55281 Indonesia 2LPP Agro Nusantara Jalan LPP No. 1 Yogyakarta 55222 Indonesia 3Master Program of Systems Engineering Faculty of Engineering Universitas Gadjah Mada Jalan Teknika Utara No. 3 Yogyakarta 55281 Indonesia

Lignocellulosic biorefinery is a promising alternative for petroleum refinery that has potential to meet a sustainable variety of needs in the future. One product of lignocelullosic biorefinery is levulinic acid (LA) which is a precursor for the production of many chemicals. Cellulose from lignocellulosic biomass is hydrolyzed to glucose, then hydroxymethylfurfural (HMF), and subsequently to LA. In this paper, the starting material was glucose, as a part of large LA synthesis project from biomass in the form of sugarcane bagasse. Glucose was reacted using 0.5 - 1.5 M hydrochloric acid catalyst at temperatures of 160 - 180 °C. From the experiments, it was found that the higher the temperature and concentration of the catalyst, the higher the LA yield. However, a combination of excessively high temperature and catalyst concentration will reduce the LA yield.

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Optimal sizing scenario of hybrid wind-PV energy in coastal road Balikpapan

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AIP Conference Proceedings 2019年第1期2085卷

作者： Muhammad Rizki Kresnawan Ahmad Agus Setiawan Wahyu Wilopo 1Master of Systems Engineering Universitas Gadjah Mada 55281 Yogyakarta Indonesia 2Department of Nuclear and Physics Engineering Universitas Gadjah Mada 55281 Yogyakarta Indonesia 3Department of Geological Engineering Universitas Gadjah Mada 55281 Yogyakarta Indonesia

To accelerate the economic growth, the local Government of Balikpapan has developed a coastal road development plan as a means to develop the area along the coastline of Balikpapan City. The development of this area requires the supply of electrical energy to meet its energy needs. In general, the majority of the electricity producer in Indonesia was supplies by fossil fuel sources. Utilization of fossil energy sources as an energy generator will provides more greenhouse gas emissions. Therefore, it needs cleaner hybrid renewable energy development to substitute of that fossil energy roles. This study examines the optimal sizing scenario of hybrid energy to supplies the 1,960,867,226 kWh per year of energy needs in coastal road of Balikpapan. The HOMER Energy Modeling software was used to analyze the optimal size of hybrid energy system. The research was developed into two scenarios to find the best results in its application. The first scenario is an off-grid hybrid energy system. This system generates 5,507,187,166 kWh per year. The second scenario is an on-grid hybrid energy. The total energy generated by this on-grid system is 2,011,597,374 kWh per year. In conclusion, optimal size of the hybrid wind-PV energy in coastal road Balikpapan was obtained by the on-grid scenario, which produces 2,011,597,374 kWh per year. The total energy production at the on-grid scenario has reduced 63% from the off-grid scenario.

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Pyrolytic thermal decomposition behavior and kinetic parameters of Tetraselmis chuii microalgae

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AIP Conference Proceedings 2020年第1期2255卷

作者： Aloon Eko Widiono Sukarni Sukarni Retno Wulandari Ardianto Prasetiyo Heru Suryanto Uun Yanuhar 1Master Program of Mechanical Engineering Graduate School State University of Malang Semarang Street 5 Malang 65145 East Java Indonesia 2Department of Mechanical Engineering State University of Malang Semarang Street 5 Malang 65145 Indonesia 3Centre of Advanced Materials for Renewable Energy State University of Malang Semarang Street 5 Malang 65145 Indonesia 4Biotechnology Laboratory Department of Water Resources Management Faculty of Fisheries and Marine Sciences University of Brawijaya Malang 65145 Indonesia

The pyrolysis characteristic of the Tetraselmis chuii microalgae has been investigated through a thermogravimetric device. This experiment was carried out on 10 °C/min heating rate with 50 ml/min continuous nitrogen flow rate and 25-900°C temperature range. The results verified that four stages degradation processes were encountered during Tetraselmis chuii pyrolysis. During the pyrolysis process, the active region of volatile release occurs in two different stages. Degradation of carbohydrates and proteins take place in stage 2, whereas lipids are decomposed in stage 3. Analysis of kinetics parameters includes Ea (activation energy), A (pre-exponential factor), and n (reaction order) yielded the respective values of 70.68 kJ/mol, 1.72/minute, 1.22 and 223.25 kJ/mol, 11.43/minute, 2.44.

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Investigation on kinetic parameters during combustion of Tetraselmis chuii microalgae under thermogravimetric analyzer

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AIP Conference Proceedings 2020年第1期2255卷

作者： Ardianto Prasetiyo Sukarni Sukarni Retno Wulandari Aloon Eko Widiono Heru Suryanto Uun Yanuhar 1Master Program of Mechanical Engineering Graduate School State University of Malang Semarang Street 5 Malang 65145 East Java Indonesia 2Department of Mechanical Engineering State University of Malang Semarang Street 5 Malang 65145 Indonesia 3Centre of Advanced Materials for Renewable Energy State University of Malang Semarang Street 5 Malang 65145 Indonesia 4Biotechnology Laboratory Department of Water Resources Management Faculty of Fisheries and Marine Sciences University of Brawijaya Malang 65145 Indonesia

The investigation on combustion characteristic and kinetic parameters of Tetraselmis chuii microalgae was carried out under thermogravimetric analyzer. The sample of microalgae has prepared by the Center for Brackish Water Aquaculture (BBPBAP) Jepara, Indonesia. The drying out the water content in the sediment was performed by an oven at temperature 80 °C as long as 24 h. The dry sample then the crushed and followed by sieving to be mesh size of 60. The thermal decomposition of Tetraselmis chuii microalgae was investigated by a thermogravimetric apparatus, in which the 10 mg of sample was heated up in the temperatures range of 25-900 °C with an atmospheric airflow rate of 50 mL/min and a heating rate of 15 °C/min. The mass loss during temperature expansion was recorded by a computer to be a thermogravimetric (TG) graph and used to evaluate the thermal characteristic of the sample. The kinetic parameters were evaluated in the active combustion zone by the Arrhenius method, resulted in the respective values of reaction order (n), logarithmic frequency factor (log A), and activation energy (E) were 1.24, 9.0 min−1 and 101.05 kJ mol−1 for stage II, and 2.38, 33.31 min−1 and 502.88 kJ mol−1 for stage IV.

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Optimal location of rail-road freight hubs: A case study

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AIP Conference Proceedings 2019年第1期2097卷

作者： Virda Hersy Lutviana Saputri Yuniaristanto Wahyudi Sutopo Muh. Hisjam 1Master Program of Industrial Engineering Faculty of Engineering Universitas Sebelas Maret Surakarta Jl. Ir. Sutami No. 36 A Kentingan Surakarta 57126 Indonesia 2Department of Industrial Engineering Faculty of Engineering Universitas Sebelas Maret Surakarta Jl. Ir. Sutami No. 36 A Kentingan Surakarta 57126 Indonesia

Hub facility location in this study is related with driving the traffic from origin to destination of the cargo express by finding optimal hub facilities and allocating demand node to hubs. The objective of this research is to determine the locations of hubs to allocate non-hub nodes to hubs with minimizing total cost. Total cost includes transportation costs from origin to destination, fixed costs for new hub investments, and carbon emission costs resulting from transportation activities among facilities. An approach to the capacitated multiple allocation hub location problem is presented and an integer linear programming model is developed to find the solution of this problem. This study also calculated the carbon emission level to consider environmental effects as an integration method in sustainable supply chain management applied to facility location problem. Computational analysis is conducted in order to observe the resulting hub networks. The final results of this research are the optimal locations for cargo express transfer terminals attached in a hub-and-spoke network. The results obtained PWS stations selected as hub facilities with the total required cost of IDR 758,650,360.103. The delivery of goods by train is done through the station route PWS, KT, YA, KTA, KYA, PWT, CN, BKS, JNG, and PSE.

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Optimization of hybrid PVA/hFDM scaffold preparation

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AIP Conference Proceedings 2021年第1期2344卷

作者： Rizqa Inayati Muhammad Suhaeri Nuzli Fahdia Melinda Remelia Radiana Dhewayani Antarianto 1Master Program in Biomedical Science Faculty of Medicine Universitas Indonesia Jl. Salemba Raya No. 6 Central Jakarta DKI Jakarta 10430 Indonesia 2Rumah Sakit Universitas Indonesia Kampus Universitas Indonesia Depok West Java 16424 Indonesia 3Stem cell and Tissue Engineering Research Cluster Indonesian Medical Education and Research Institute (IMERI) Universitas Indonesia Salemba Raya Jakarta West Java 10430 Indonesia 4Doctoral Program in Biomedical Science Faculty of Medicine Universitas Indonesia Jl. Salemba Raya No. 6 Central Jakarta DKI Jakarta 10430 Indonesia 5Department of Basic Biomedicine Faculty of Medicine Universitas Kristen Indonesia Jl Mayjen Sutoyo No 2 DKI Jakarta 13630 Indonesia 6Department of Histology Faculty of Medicine Universitas Indonesia Jl. Salemba Raya No. 6 Central Jakarta DKI Jakarta 10430 Indonesia

Osteogenic differentiation from Mesenchymal Stem Cell (MSC) to osteoblast has a clinical significance which is very important for treating bone injuries, in the form of femoral fractures with the most cases in Indonesia. Various studies have been conducted to find the best scaffold that can improve osteogenic differentiation, one of which is the development of a hybrid scaffold made from natural biomaterials in the form of the extracellular matrix, and from synthetic biomaterials. The discovery of the best scaffold is not only focused on the source of the scaffold but also requires optimization of the method in making the scaffold. Therefore, the aim of this study is to find out the optimum method for making hybrid scaffolds that support osteogenic differentiation from MSC. Materials and methods: human Fibroblast-derived Matrix (hFDM) as a hybrid scaffold material collected from decellularized fibroblasts cultures from post-cleft-surgery reconstruction palatal skin. Fibroblast cell cultures were divided into two groups of cultures, cultures without Platelet Rich Plasma (PRP), and cultures with the addition of PRP. For decellularization, we performed optimization at the preparation stage of the decellularization solution, and the time of culture for decellularization. In the preparation of the decellularization solution, we divided it into two groups, NH4OH as material from the decellularization solution was diluted with PBS before mixing with 0.25% Triton X-100, and NH4OH was diluted directly in 0.25% Triton X-100. In optimizing the culture time for decellularization, we divided it into three groups, decellularization on the day when cell growth reached 100% confluent, decellularization on the 3rd day after 100% confluent (H + 3) cells, and decellularization on the 4th day after 100% confluent (H + 4) cells. Next, the hFDM matrix is collected and added Polyvinyl Alcohol (PVA) solutions to form a hybrid PVA / hFDM scaffold in the form of a hydrogel. Observations on h

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