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38th IMAC, A Conference and Exposition on Structural Dynamics, 2020

作者： Koller, Lukas Witteveen, Wolfgang Pichler, Florian Study Program "Mechanical Engineering" University of Applied Sciences Upper Austria Wels Austria

ISBN: (纸本)9783030476250

The determination of nonlinear state-dependent surface loads, acting on finite element (FE) structures, represents a computationally challenging and costly task in dynamic simulations. While for time integration an enormous reduction of the FE models number of degrees of freedom (DOFs) can be achieved by subspace projection, the computation of nonlinear surface loads usually depends on the non-reduced physical DOFs. In order to overcome this issue, so-called Hyper-Reduction (HR) methods have been introduced. These methods try to compute the surface loads in a reduced subspace as well. In this publication, an intermediate approach is proposed, which is called "Semi Hyper-Reduction" (SHR). The equations for computing the surface loads are built up in the full space and then projected into a lower dimensional subspace via proper force trial vectors. The required force trial vectors, called "stress modes", thereby can be determined a priori without any nonlinear computations using the full DOF model. As a numerical example, a 3D crank drive is used, where the piston and the cylinder are separated by a hydrodynamic lubrication film, which is considered by Reynolds equation. © The Society for Experimental Mechanics, Inc 2021.

关键词： Vectors

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mechanical properties of fly ash-based geopolymer concrete using variation in maximum size of coarse aggregate 1

Mechanical properties of fly ash-based geopolymer concrete u...

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1st International Conference on Innovation in Research, ICIIR 2018

作者： Patrisia, Y. Coenraad, R. Inderawan, N.A. Elidad, E. Study Program of Building Engineering Education University of Palangka Raya Palangka Raya Indonesia Study Program of Mechanical Engineering Education University of Palangka Raya Palangka Raya Indonesia

The aim of this research was to study the mechanical properties (compressive strength and splitting-tensile strength) of fly ash-based geopolymer concrete using variation in the maximum size of coarse aggregate. The mode of study was laboratory research. Fly ash obtained from Asam-Asam Steam Power Plant, South Kalimantan, Indonesia. The maximum size of coarse aggregate was 10 mm, 20 mm and 30 mm. The geopolymer concrete proportion divided into 3 different mixtures and each contained 400 kg/m3 of fly ash. The alkaline activator used as sodium silicate and 10M sodium hydroxide in the ratio 2:1. The ratio of alkaline activator to fly ash was 0.4. Cylindrical specimens (size 100 mm x 200 mm) counted 10 pieces for each mixture proportion and cured at ambient condition. The test result showed that average of compressive strengths and splitting-tensile strengths for specimens with 10 mm, 20 mm, and 30 mm maximum size of aggregate at the age of 21 days were 11.04 MPa and 6.12 MPa, 10.82 MPa and 5.22 MPa, 10.06 MPa and 4.84 MPa respectively. In conclusion, the greater the maximum size of coarse aggregate, the smaller the value of compressive strength and splitting-tensile strength. © 2020 Published under licence by IOP Publishing Ltd.

关键词： Fly ash

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Application of VLAB-Based STEM in the Direct Circuit Electricity Section 2

Application of VLAB-Based STEM in the Direct Circuit Electri...

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2nd International Conference on Computer, Science, engineering, and Technology, ICComSET 2019

作者： Rachmat, A. Jannati, E.D. Susandi, D. Kaniawati, I. Siahaan, P. Mechanical Engineering Study Program Universitas Majalengka Indonesia Industry Engineering Study Program Universitas Majalengka Indonesia Department of Physics Education Universitas Pendidikan Indonesia Bandung Indonesia

Our research aims to determine the results of student responses after applying VLAB-based STEM learning in the direct current electric circuit section. This study uses a qualitative method. Sampling using a purposive sampling technique. The sample consisted of 13 students of mechanical engineering study program at Universitas Majalengka. The sample consisted of 13 students of mechanical engineering study program at Universitas Majalengka.. Data collection techniques using student questionnaire responses. The results of the questionnaire were analyzed descriptively. Most students respond like VLAB-based STEM, the stages of learning provide learning experiences for students so students are motivated in learning. © 2020 Published under licence by IOP Publishing Ltd.

关键词： Students

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Energy Optimization Modeling of Geothermal Power Plant (Case study: Darajat Geothermal Field Unit III) 5

Energy Optimization Modeling of Geothermal Power Plant (Case...

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5th ITB International Geothermal Workshop, IIGW 2016

作者： Sinaga, R.H.M. Darmanto, P.S. Engineering Management Study Program Del Institute of Technology Laguboti Toba Samosir22381 Indonesia Mechanical Engineering Study Program Bandung Institute of Technology Bandung40132 Indonesia

Darajat unit III geothermal power plant is developed by PT. Chevron Geothermal Indonesia (CGI). The plant capacity is 121 MW and load 110%. The greatest utilization power is consumed by Hot Well Pump (HWP) and Cooling Tower Fan (CTF). Reducing the utility power can be attempted by utilizing the wet bulb temperature fluctuation. In this study, a modelling process is developed by using engineering Equation Solver (EES) software version *** possibility of energy saving is indicated by Specific Steam Consumption (SSC) net in relation to wet bulb temperature fluctuation from 9°C up to 20.5°C. Result shows that the existing daily operation reaches its optimum condition. The installation of Variable Frequency Drive (VFD) could be applied to optimize both utility power of HWP and CTF. The highest gain is obtained by VFD HWP installation as much as 0.80% when wet bulb temperature 18.5 °C.

关键词： Energy conservation

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The effect of groove welding on mechanical properties and microstructure of wear resistance steel plate by Submerged Arc Welding 1

The effect of groove welding on mechanical properties and mi...

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1st International Symposium on Advances and Innovations in mechanical engineering, ISAIME 2019

作者： Mansjur, Zuldesmi Sumual, Hendro M. Tamba, I.P. Mechanical Engineering Study Program Engineering Faculty Manado State University Indonesia Mechanical Engineering Education Department Engineering Faculty Manado State University Indonesia

Aim of this research is to analyze the mechanical properties and microstructure of wear resistance steel plates joined by Submerged Arc Welding at different grooves welding. The welding current of 300 Ampere, voltage of 28 Volt and travel speed of 38 cm/min was applied. The microscopical examination methods were used for weld zones. Impact toughness and rockwell hardness test were obtained from the weld metal, heat affected zone and the base metal samples. The fracture surfaces were examined by using optical microscope. As results, there was no difference of hardness and microstructure among three grooves welding. The significant differences were detected at the weld zones. Base metal had the highest hardness value. Ferrite and pearlite phases were obtained at three weld zones, but the heat affected zone had coarser grain structure than the base metal. Weld metal volume and electrode length significantly affected the impact toughness of joint, where the larger of the weld metal volume and length of electrode fill in the groove welding, the higher of impact toughness. The lowest impact energy and toughness value were attained at V groove and the highest was at I groove. The fracture surfaces at all groove welds showed ductile fracture dominantly. © Published under licence by IOP Publishing Ltd.

关键词： Fracture toughness

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Optimization of Extrusion Parameters for Composite Pla/Mg/Ha Filaments Using the Taguchi Method for Bone Scaffold

SSRN

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SSRN 2025年

作者： Prakoso, Akbar Teguh Basri, Hasan Adanta, Dendy Gunawan Akbar, Imam Syahrom, Ardiyansyah Arifin, Amir Department of Mechanical Engineering Faculty of Engineering Universitas Sriwijaya Indralaya South Sumatra 30662 Indonesia Doctoral Program Study of Engineering Science Faculty of Engineering Universitas Sriwijaya Palembang South Sumatra30139 Indonesia Applied Mechanics and Design Faculty of Mechanical Engineering Universiti Teknologi Malaysia Johor Bahru Skudai81310 Malaysia Universiti Teknologi Malaysia Johor Bahru Skudai81310 Malaysia

This paper attempts to optimise the single screw extrusion (SSE) process parameters for extruding polylactic acid (PLA)/magnesium (Mg)/hydroxyapatite (HA) composite filament, aiming for a final filament diameter of 1.75 mm to enhance process efficiency and output quality. In this study, the Taguchi method was employed to systematically evaluate how screw speed, nozzle diameter, material composition, and temperature affect filament diameter. The analysis demonstrated that screw speed, nozzle diameter, material composition, and temperature significantly affect the filament diameter. Under optimal conditions (94% wt PLA, 4% wt Mg, and 2% wt HA, 1.95 mm nozzle diameter, 6 rpm screw speed, and 175°C), the resulting filament diameter closely approached 1.75 mm. These findings enhance the fabrication efficiency and quality of composite filaments, with promising applications in advanced bone scaffolds. © 2025, The Authors. All rights reserved.

关键词： Scaffolds (biology)

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Impacts of Grid Frequency Variation on Dynamic Performance of DFIG Based Wind Turbine 5

Impacts of Grid Frequency Variation on Dynamic Performance o...

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5th International Symposium on Material, Mechatronics and Energy 2018, ISMME 2018

作者： Shiddiq Yunus, A.M. Energy Conversion Study Program Mechanical Engineering Department Politeknik Negeri Ujung Pandang Indonesia

Wind energy is one of popular sources of renewable energy that massively used to generate electric power nowadays. Among wind generator technologies, Doubly Fed Induction Generator (DFIG) is placed as the first dominant wind generator type that is installed worldwide since 2004. Its popularity is due to the advantages of its capability to extract more energy compare to the fixed speed type. Moreover, it uses only one-third converter size which reduced the total construction cost compared to its closest rival, Full Converter Wind Turbine Generator Type. Although DFIG widely installed worldwide, it is in fact, very sensitive to the grid disturbances such as frequency variation. Based on IEEE standard for 60 Hz system, a power system should not be allowed to work in less than 59.3 Hz or more than 60.5 Hz. In this paper, DFIG-grid connected is extensively simulated in the condition of frequency variation that is carried out using Matlab/Simulink. The results show that some important parameters such as power output of the generator, voltage at point of common coupling, voltage at DC link and generator speed are experiencing significant rise/drop which in turn might damage the wind turbine generator. © Published under licence by IOP Publishing Ltd.

关键词： Wind Turbine Generators

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Electrical system design of solar-powered electrical water recreational and sport vessel 1

Electrical system design of solar-powered electrical water r...

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1st International Conference on Automotive, Manufacturing, and mechanical engineering, IC-AMME 2018

作者： Sunaryo Shadu Imfianto, Pradhana Naval Architecture and Marine Engineering Study Program Department of Mechanical Engineering Universitas IDN Depok 16424 Indonesia

Indonesia is the world's largest archipelago with more than 17 000 islands, and the best marine tourism destination due to its beautiful beaches and underwater scenery, but Indonesia is also the most vulnerable country to be affected by climate change due to the greenhouse effect. Besides industry, the transportation sector is the highest contributor to the global greenhouse effect. In order to reduce the source of the greenhouse effect, the Indonesian Government has committed to using new and renewable energy as an alternative to fossil-based fuel. In an attempt to contribute to the Government's efforts and to advance the national marine tourism, the research is aimed to design water recreational and sport vessel that powered by a solar generated electric engine, as further development of Universitas Indonesia's solar boat participated in International Solar-boat Challenge competition in the Netherlands. The research is focused on the effective use of solar energy as the main source for powering the vessel's electrical engine, based on the existing optimum shape and dimensions of the boat. Information and data regarding the arrangement of the vessel, solar electric generation processes and vessel powering system obtained from literature study, discussion with experts, and on the spot surveys of various recreational vessels were used as input for the calculation and simulation of the vessel being investigated. The research results are expected could be further developed for other related usages such as fish farming, coastal fishing rig, floating restaurant, etc. © 2019 The Authors, published by EDP Sciences.

关键词： Greenhouse effect

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Prototype Excavator with Pneumatic System Controlled Using Android Device 1

Prototype Excavator with Pneumatic System Controlled Using A...

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1st International Conference on Applied Science and Technology, iCAST 2018

作者： Randis Department of Mechanical Engineering Study Program of Heavy Equipment Balikpapan State Polytechnic Balikpapan Indonesia

ISBN: (纸本)9781538675489

This research is aimed to design and create a prototype excavator pneumatic system with android smart phone control system. The prototype excavator system made in this research utilizes Arduino Uno ATmega 328 as its microcontroller, while the Bluetooth module device is used as a connecting medium between the android device with the arduino to move the cylinder. The mechanical device represent the two main parts of the device: based and the arm section, six cylinders used to move each boom, arm, and bucket section, while the swing motion is done by using a DC motor. App Inventor is used to create an application on android, while arduino program is used to embed the program into the microcontroller. The working principle of the whole system is by using an android device connected with Bluetooth module to give signal to the microcontroller, then microcontroller will activate the relay and relay activate solenoid and end the process by moving the cylinder. Calculation of cylinder force obtained is 54,95 N when cylinder move forward and 46,158 when cylinder move backward. © 2018 IEEE.

关键词： Excavators

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Development of an Automatic Anti Pitching System (APS) Autonomous Surface Vehicle (ASV) for Fish Mapping 3

Development of an Automatic Anti Pitching System (APS) Auton...

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3rd International Conference on Science and Technology 2019, ICST 2019

作者： Saputra, Noverdo Lukmana, Muhammad Arifudin Suranto, Purwo Joko Study Program Naval Architecture Universitas Pembangunan Nasional Veteran Jakarta Indonesia Study Program Mechanical Engineering Universitas Pembangunan Nasional Veteran Jakarta Indonesia

The common problem occurs in fish mapping using autonomous surface vehicles (ASV) is pitching stability. Some researchers have indicated that problem affects the results of mapping. The target of this system is to design an Autonomous Pitching System (APS) for ASV using numerical simulation software. The simulation is done by implement APS into the system, producing an oscillatory motion from the ASV. For both dynamics of craft in short and long periods, APS with proportional controller (P), proportional-integral controller (PI), and proportional-integral-derivative controller (PID) are developed in order to minimize the oscillatory behaviour. It was found that for the short period dynamics, the APS with PI controller was the optimal controller, followed by the PID controller and then the P controller. For the long period dynamics, the APS with PID controller was optimal. © 2020 IOP Publishing Ltd. All rights reserved.

关键词： Three term control systems

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