9 research outputs found
Effects of the combination between bio-surfactant product types and washing times on the removal of crude oil in nonwoven fabric
No full textELECTRONIC POWER SYSTEM UNTUK SATELIT NANO
No full textAn electronic power system has been made and implemented to be able to
save and distribute electrical power. Electronic power system is an important part
of satellite that function to produce, to save and to distribute electrical. If suffers
failure on electronic power system, then all the subsystem receiving the supply of
power will be in default.
Electronic power system of nano satellite that researched is based on
microcontroller of AVR family, ATMega 8. This system is completed by ACS712
sensor, MAX7500 sensor, switching LM2576 regulator and DG560A
multiplexer. The result of this research is an electronic power system that function
to distribute the current and the voltage in each channel used, namely 3.3 volt, 5
volt, and 12 volt, and able to control the current and voltage if there is overloaded.
All these data are then bundled into a single data string which is sent by serial
communication and displayed on Grafical User Interface ( GUI ). Data of result of
measurement the current and voltage can be deposited in the excel form
Electronic Power System untuk Satelit Nano
Get PDFAbstrakSebuah electronic power system telah dirancang dan diimplementasikan untuk menyimpan dan menyalurkan energi listrik. Electronic power system merupakan bagian penting dari satelit yang berfungsi untuk menghasilkan, menyimpan dan menyalurkan listrik. Apabila terjadi kegagalan pada electronic power system, maka seluruh sub sistem yang mendapatkan pasokan daya akan mengalami gangguan. Electronic power system satelit nano yang diteliti berbasis mikrokontroller keluarga AVR, ATMega 8. Sistem ini dilengkapi dengan sensor ACS712, sensor MAX7500, regulator switching LM2576 dan multiplekser DG560A. Hasil dari penelitian ini adalah sebuah electronic power system yang berfungsi menyalurkan arus dan tegangan pada masing-masing channel yang digunakan, yaitu 3.3 V, 5 V dan 12V, serta mampu mengendalikan arus dan tegangan apabila terdapat kelebihan beban. Data digabung dalam format string yang dikirim melalui komunikasi serial dan ditampilkan pada Graphical User Interface (GUI). Data hasil pengukuran arus dan tegangan juga dapat disimpan dalam bentuk excel. Kata kunci— Nanosatelit, eps, sensor, power system Abstract An electronic power system has been made and implemented to be able to save and distribute electrical power. Electronic power system is an important part of satellite that function to produce, to save and to distribute electrical. If suffers failure on electronic power system, then all the subsystem receiving the supply of power will be in default. Electronic power system of nano satellite that researched is based on microcontroller of AVR family, ATMega 8. This system is completed by ACS712 sensor, MAX7500 sensor, switching LM2576 regulator and DG560A multiplexer. The result of this research is an electronic power system that function to distribute the current and the voltage in each channel used, namely 3.3 volt, 5 volt, and 12 volt, and able to control the current and voltage if there is overloaded. All these data are then bundled into a single data string which is sent by serial communication and displayed on Grafical User Interface ( GUI ). Data of result of measurement the current and voltage can be deposited in the excel form. Keywords—Nanosatellite, eps, sensor, power syste
Recommended from our members
The crispness of cassava crisps with random shape by compression test
No full textThe most popular term that is used to represent brittleness texture of dry food is its crispness. Based on the previous studies, the crispness becomes the most essential quality of crisps that define the enjoyment when eating the food. Despite its importance, crispness is still determined qualitatively by human sensory perception which is very ambiguous. Thus, a measurement technique to quantitatively define the crispness level of dry food is needed. This study introduces a measurement technique by means of compression test to quantitatively determine the crispness of dry food with random shapes. The evaluated specimen is cassava crisps with three different thicknesses: 1, 2, and 3 mm. The parameters utilized to express the crispness level are strain energy and jaggedness obtained from the load-displacement curve. According to the evaluation, the results show that the 1 and 2 mm specimens are 29.2 and 16.5% crispier than the thickest specimen of 3 mm. © 2023 Author(s).12 month embargo; first published 27 April 2023This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at [email protected]
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A quick-release hanging hook design and 3D printing
No full textInnovative and efficient are the goal of all products made by humans. In addition to innovative designs, the ease with which users can use the product is an essential aspect of a product design. This paper reports the work of a group of undergraduate student project in additive manufacturing course. The aim of the project is to produce a hook prototype that can be used on a pegboard located at the ceiling. The hook is expected can be installed and removed easily from the bottom of the pegboard with hole diameter of 12.7 mm and thickness of 6.35 mm and able to carry a 7 kg load. In this paper, the hook is designed and simulated using SolidWorks software, printed using the FDM 3D printing machine, and tested with a 7 kg hanging load. The finite element simulation shows the proposed design is able to hold the required 7 kg load. The ease installation and removal of the 3D printed hanging hook is also can be fulfilled. The finite element simulation is also validated by applying 7 kg load onto the hanging hook. Hence the proposed design can accomplish the requirements of the project. © 2023 Author(s).12 month embargo; first published 27 April 2023This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at [email protected]
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Primary design concept of mini compression test machine for food texture analyzer
No full textThe sensory analysis method is commonly used for the quality control process. However, this method may provide a biased result since it counts as a subjective measurement. Therefore, engineers came up with the idea of implementing a mechanical testing tool, called a texture analyzer, to measure the properties of the food itself. This study aims to develop a preliminary design of a texture analyzer that can function as a mini-compression test machine that is lightweight, portable, low cost, but still performs the texture analyzer's essential function. Design synthesis is done by reviewing the existing texture analyzers. As a result, the proposed device uses ball screws with a stepper motor as the control machine and load cell to measure the load applied. Furthermore, the dimension of this mini compression is D245 x W200 x H537.5 mm with a 250 mm effective sliding distance, and the maximum load is 10 kg. The design is smaller and lighter than the commercial product; thus, it can be considered portable. Design mainly constructed using SS304 and aluminum to provide a robust design and minimize compliance error. However, some parts were 3D printed due to the complexity in the manufacturing process. The estimated torque that the motor should produce is 1.2 N.m. This machine is expected to be useful for educational purpose as a demonstration tool. © 2023 Author(s).12 month embargo; first published 27 April 2023This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at [email protected]
Bidirectional Converter Optimal Control for Battery Charge/Discharge System
No full textThe bidirectional converter is essential to battery charge/discharge system. However, stabilizing output voltage and current of this converter is a complex task due to nonlinear system behaviour, changing load demands, and the battery’s dynamic characteristics. This paper proposes an optimal control method for a bidirectional converter employed in battery charge/discharge system. The control method utilizes a proportional-integral (PI) scheme, in which the parameters are fine-tuned using the sequential quadratic programming (SQP). The proposed method is simulated and validated using MATLAB/Simulink. Simulation results show that the SQP-tuned PI method greatly enhances the control accuracy and stability, compared to classical fixed-gain PI controllers. The combination of classical control with modern optimization reveals a promising method to enhance energy management in DC microgrid and energy storage applications
System Integration for Medical Data Dissemination and Multimedia Communication in the Implementation of Tele-ECG and Teleconsultation
Get PDFOne of the options to extend medical services coverage is deploying a telemedicine system, where medical personnel make use of ICT (Information and Communication Technology) to overcome distance and time constraints. The implementation of telemedicine systems in Indonesia faces challenges posed by the lack of ICT infrastructure availability, such as communication networks, data centres, and other computing resources. To deal with these challenges, a telemedicine innovation needs to produce a modular and flexible system that is adaptive to medical services needed and the available ICT infrastructure. This paper presents research and development of a telemedicine system prototype for tele-electrocardiography (tele-ECG) and teleconsultation. The contributions offered are integrating system from various open-source modules and the system operational feasibility based on its function and performance. The research is conducted on a testbed which represents various components involved in the telemedicine system operation. Experiments are carried out to assess the system functionality and observe whether tele-ECG and teleconsultation reach their expected performance. Experiment results show that the system works properly and recommend several multimedia communication modes to achieve the target quality based on the available network bandwidth
Determinación mediante ensayos de esfuerzo de tensión de falla de probetas normalizadas de PLA Carbono fabricadas por deposición de filamento fundido
No full textLa impresión 3d es un campo de la manufactura que ha crecido de forma exponencial en cada uno de los proyectos de forma que ha funcionado como prototipado en las distintas industrias como automovilística, aeronáutica, sector de la construcción y sin fin de usos. En los últimos 10 años se ha venido desarrollando y aplicando innovaciones en distintos tipos de materiales donde se busca reforzarlos para mejorar sus propiedades mecánicas de modo que es de gran importancia el poder caracterizar estos materiales mediante distintos tipos de ensayos mecánicos. El primer paso para una correcta caracterización es modelar mediante un programa CAD cada probeta con las dimensiones establecidas para cada norma, para este estudio se empleará ensayos de tensión y flexión en PLA carbono para estudiar su comportamiento variando 2 parámetros en este estudio como lo son altura de capa y orientación de la pieza respecto a la cama de impresión con el fin de deducir cual es la variación con mejor resistencia.3D printing is a manufacturing field that has experienced exponential growth in a wide range of projects, serving as a prototyping tool in various industries such as automotive, aerospace, construction, and many others. Over the past decade, innovations have been developed and applied to different types of materials, aiming to reinforce them and improve their mechanical properties. Thus, it is essential to characterize these materials through various mechanical tests. The first step in proper characterization is to model each specimen using CAD software with the dimensions established by the relevant standards. This study will employ tensile and flexural tests on carbon PLA to analyze its behavior by varying two parameters: layer height and the orientation of the part concerning the printing bed. The goal is to determine which variation yields the highest strength.PregradoIngeniero MecánicoIntroducción y justificación.....13
Objetivos.....15
Objetivo general.....15
Objetivos específicos.....15
Capítulo 1: Marco teórico.....16
1.1 Antecedentes......16
1.2. Proceso FDM.....18
1.3 Parámetros de impresión.....19
1.3.1 Altura de capa.....19
1.3.2 Densidad de relleno.....20
1.3.3. Patrón de relleno.....20
1.3.4. Temperatura.....21
1.3.5 Ángulo de impresión.....22
1.3.6. Soportes.....22
1.4. Material de estudio.....23
1.4.1 Ácido poliláctico carbono (PLA Carbono).....23
1.5. Ensayos mecánicos.....24
1.5.1. Norma ASTM D3039 (Tensión).....24
1.5.2. Norma ASTM D790 (Flexión).....25
Capítulo 2: Marco metodológico.....27
2.1 Diseño experimental.....27
2.2. Preparación de Muestras.....29
2.3. Fabricación de Probetas.....29
2.4 Ensayo de tensión.....33
2.5 Ensayo de flexión .....34
Capítulo 3. Recolección y organización de datos.....36
3.1 Resultados ensayos de tensión.....36
3.1 Resultados ensayos de flexión.....42
Capítulo 4. Interpretación de resultados.....50
4.1 Análisis ensayo de Tensión.....50
4.2 Análisis ensayo de Flexión.....56
4.3 Análisis estadístico ANOVA Ensayo de Tensión.....61
4.4 Análisis estadístico ANOVA Ensayo de Flexión.....69
Capítulo 5. Discusión y conclusiones.....76
Capítulo 6. Bibliografía.....8
