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A Study on The Crack Behavior of Baggase-Polyester Composites Rozi Saferi; Asmara Yanto
Jurnal Teknik Mesin (JTM) Vol 7, No 2 (2017)
Publisher : LP2M - Institut Teknologi Padang

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Abstract

The development of composite technology has begun to change nowadays, from composite fiber-synthesized to composite natural fiber fabrics. Natural baggase fiber has the opportunity to be developed as a strengthening medium in polymer resins. The purpose of this study were to know the effect of fiber orientation to maximum critical load for different initial crack lengths, to know elastic energy of composite material having fiber orientation varied at the time of loading and to know the effect of fiber orientation on fracture toughness for composite material. In this paper, it’s used 1.5mm diameter sugarcane fibers and the polyester matrix. The fraction volume of fiber and resin used is 5%: 95%. Fiber is given 20% NaOH treatment. Then the fiber is arranged with orientation 0/90º and 0/45º. While the bending test specimen is in accordance with ASTM-D5045 standard, the size of the specimen dimension is 125 mm long, 30 mm wide and 10 mm thick; with crack variations are 7mm, 9mm, 11mm, 13mm, and 15mm. It’s could be concluded that the critical load will decrease as the initial crack length increases. Composite material with 0/90º fiber orientation has elastic energy greater than composite with 45º fiber orientation. And crack propagation rate in composite material with fiber orientation 0/90º is faster than composite with 0/45º orientation.
Efficiency Analysis of NACA 4412 Semi-Inverse Taper Wind Turbine For Power Plant Sulaiman Sulaiman; Asmara Yanto; Ikhsan Febryan
Jurnal Teknik Mesin (JTM) Vol 10, No 1 (2020)
Publisher : LP2M - Institut Teknologi Padang

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Abstract

In this work, a horizontal axis wind turbine (HAWT) are designed and tested to determine turbine efficiency. The wind turbine is built with 3 blades of semi-inverse taper type. This blade is a modification of a type of inverse paper blade that is called semi-inverse taper. This blade is made for moderate wind speeds considering wind in Indonesia. To analyze turbine efficiency, it is necessary to do turbine design and turbine testing stages. From the blade design, the blade radius is 0.9 m. Based on the results of testing and analysis of wind turbine efficiency it can be concluded that the input power and output power are higher with increasing wind speed. However, for the same wind speed, the output power is always smaller than the input power. The increase in input power due to an increase in wind speed is greater than the increase in output power to an increase in wind speed, so the efficiency is lower. The highest wind turbine efficiency was obtained at 84.97% at the lowest wind speed of 5.9 m/s. Whereas at the highest wind speed of 9.3 m/s, turbine efficiency is the lowest at 37.05%.
ANALISIS KESALAHAN MAGNITUDO FRF SISTEM SDOF DENGAN METODE SINYAL SWEPT-SINE DALAM SPAN FREKUENSI 0-50 HZ Asmara Yanto; Reztu Illahi
Jurnal Teknik Elektro Vol 3, No 2 (2014): Jurnal Teknik Elektro
Publisher : Situs resmi ITP Press

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Abstract

In this paper, analysis of error of FRF (Frequency Response Function) magnitude of Single Degree of Freedom (SDOF) system using swept-sine signals has been simulated. The used swept-sine signals are linear swept-sine, S111 swept-sine and S535 swept-sine signals. In numerical simulations have been done the analysis of dynamic magnification function of the system with aim to predict the minimum swept time (stimulus duration) in the linear swept-sine signal method, the S111 swept-sine signal method, and the S535 swept-sine signal method, which can yield an accurate the FRF’s magnitude of the SDOF systems. Here, the SDOF systems were varied in the 0-50 Hz of measurement frequency span with 0.5% and 1% of damping ratio. The swept-sine signal stimulus durations were varied from 1 s to 10 s. From the analysis it can be concluded that by using the linear swept-sine signal method need to stimulate a system about 7 s if the system’s resonant frequency be around mid-span 0-50 Hz of measurement frequency span. If the system’s resonance frequency is not be around mid-span 0-50 Hz of measurement frequency span, then by using this method required a longer stimulus duration to obtain an accurate the FRF’s magnitude. While using the S111 swept-sine signal and S535 swept-sine signal methods, an accurate FRF’s magnitude can be obtained through stimulus more quickly, in which the S111 swept-sine signal method with about 3 s stimulus and the S535 swept-sine signal method with about 2 s stimulus, if the system’s resonance frequency is closer to the final of 0-50 Hz frequency span.
PENGEMBANGAN METODE PENGONTROLAN TEMPERATUR ALIRAN UDARA DENGAN MENGGUNAKAN ANALOG VOLTAGE-CONTROLLED PHASE-ANGLE-FIRED POWER INTERFACE Asmara Yanto; Syafrul Hadi
Jurnal Teknik Elektro Vol 2, No 3 (2013): Jurnal Teknik Elektro
Publisher : Situs resmi ITP Press

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Abstract

Alat-alat pengontrol temperatur aliran udara pada alat pengering udara buatan untuk proses pengeringan hasil-hasil pertanian, perkebunan, dan perikanan hanya dapar digunakan pada satu saluran udara. Permasalahan ini dapat dipecahkan dengan melakukan suatu inovasi alat pengontrol temperatur aliran udara. Pada makalah ini dikembangkan suatu metode dan membuat sebuah alat pengontrol temperatur aliran udara dengan menggunakan analog voltage-controlled phase-angle-fired power interface method. Disini, pengontrolan temperatur aliran udara dikembangkan untuk mengontrol tiga macam temperatur aliran udara pada sistem saluran udara. Pada setiap saluran udara ditempatkan pemanas dan sensor temperatur. Diharapkan, metode dan produk dari alat pengontrol ini dapat digunakan pada alat pengering buatan untuk proses pengeringan hasil-hasil pertanian, perkebunan, dan perikanan.
ANALISA UNJUK KERJA PENGAYAK GETAR SEBAGAI SISTEM GETARAN DUA DERAJAT KEBEBASAN TERHADAP PENGAYAKAN ABU SEKAM PADI Asmara Yanto
Jurnal Momentum ISSN 1693-752X Vol 15, No 2 (2013): Volume 15 No 2 Agustus 2013
Publisher : ITP Press

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Sebuah pengayak getar dengan sumber eksitasi dari dalam sistem berupa mekanisme engkol peluncur sebagai sistem getaran dua derajat kebebasan telah diuji untuk pengayakan abu sekam padi. Pengayak getar ini terdiri dari empat pegas yaitu dua pegas di bagian depan dan dua pegas di bagian belakang dengan konstanta pegas masing-masing adalah 7401 N/m, sebuah saluran hasil ayakan dengan massa 3.8 kg, dan sebuah ayakan dengan massa 2 kg mengunakan mesh 150. Secara eksperimental, pengayak getar diuji dengan memvariasikan putaran motor penggerak mekanisme engkol peluncur dan aliran massa abu sekam padi masuk ayakan untuk mendapatkan data-data simpangan koordinat pegas yang bergetar dan simpangan titik berat pengayak getar. Dari hasil pengolahan data pengujian didapatkan frekuensi pribadi pertama pengayak getar sebesar 236.4 rad/s. Pada frekuensi motor penggerak mekanisme engkol peluncur yang hampir sama dengan frekuensi pribadi pertama pengayak getar yaitu sebesar 235.1 rad/s mengasilkan amplitudo getaran 2.24 mm untuk simpangan translasi dan 0.0033 rad untuk simpangan rotasi. Laju massa abu sekam padi masuk ayakan sebesar 7.69 gr/s menghasilkan laju massa hasil ayakan yang optimal sebesar 1.49 gr/s dengan putaran motor 2430 rpm.
ANALYSIS OF THE FRF’S CURVE ACCURACY OF TDOF SYSTEM USING LINEAR SWEPT-SINE EXCITATION METHOD Asmara Yanto
Jurnal Teknik Mesin (JTM) Vol 3, No 2 (2013)
Publisher : LP2M - Institut Teknologi Padang

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Abstract

Pengukuran FRF (Fungsi Respon Frekuensi) memiliki peranan yang sangat penting dalam dinamika struktur. Pengukuran ini biasanya diselenggarakan untuk memperoleh kurva FRF dari sebuah sistem yang diinvestigasi. Dari kurva FRF dapat ditentukan harga frekuensi resonansi dan rasio redaman sistem. Pada pengukuran ini, sistem umumnya dieksitasi dengan palu impak atau shaker. Pengukuran FRF dengan eksitasi shaker sering dilakukan dengan metode eksitasi linear swept-sine. Makalah ini mepaparkan suatu analisa terhadap ketelitian kurva FRF yang diperoleh dari penerapan metode ini pada sebuah Sistem 2-DK (Dua Derajat Kebebasan). Ketelitian kurva FRF ditentukan dengan mengacu kepada persentase kesalahan harga magnitudo FRF dan frekuensi resonansi Sistem 2-DK yang diperoleh terhadap harga teoritiknya. Dari analisa yang dilakukan dapat disimpulkan bahwa ketelitian kurva FRF Sistem 2-DK bergantung kepada durasi eksitasi linear swept-sine yang diterapkan. Apabila eksitasi linear swept-sine diterapkan ke Sistem 2-DK dengan durasi yang lebih lama, maka persentase kesalahan magnitudo FRF dan frekuensi resonansi Sistem 2-DK yang diperoleh lebih kecil dan mendekati harga teoritiknya.
Design, Fabrication and Analysis of Material Requirements of Spices Mixing Machine Rozi Saferi; Asmara Yanto; Jendri Surianda
Jurnal Teknik Mesin (JTM) Vol 10, No 2 (2020)
Publisher : LP2M - Institut Teknologi Padang

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The process of mixing the spices often done manually, which it takes time and reduces the effectiveness of the process. This study aims to analyze the design, material requirements and production process of a spices mixer machine. In this work is also done to analyze the speed optimization in mixing process of spices with the main food. Analysis of the machine design using the finite element method by aided Autodesk Inventor software. The analysis results show that the mass density of the frame is 8.8041 g/cm3, and the maximum compressive strength is 345 MPa. Furthermore, the young’s modulus is 200 GPa, the position ratio is 0.3 and the shear modulus is 76.9231 GPa. The test of spices mixer machine showed that the optimal spice stirring value occurred at 35 rpm with a mixing percentage of 83%.The process of mixing the spices often done manually, which it takes time and reduces the effectiveness of the process. This study aims to analyze the design, material requirements and production process of a spices mixer machine. In this work is also done to analyze the speed optimization in mixing process of spices with the main food. Analysis of the machine design using the finite element method by aided Autodesk Inventor software. The analysis results show that the mass density of the frame is 8.8041 g/cm3, and the maximum compressive strength is 345 MPa. Furthermore, the young’s modulus is 200 GPa, the position ratio is 0.3 and the shear modulus is 76.9231 GPa. The test of spices mixer machine showed that the optimal spice stirring value occurred at 35 rpm with a mixing percentage of 83%.
Design and Finite Element Analysis of Lawn Mower Machine Rozi Saferi; Asmara Yanto; Joko Sucipto
Jurnal Teknik Mesin (JTM) Vol 10, No 1 (2020)
Publisher : LP2M - Institut Teknologi Padang

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Abstract

Technological advances are now being found in everyday, one of them is an android smartphone. Android can be used to control motor speed without using cables with the help of microcontroller, motor driver and bluetooth module. In this study the autors designed and performed static analysis on the framework an android-based lawn mower using Autodesk Inventor. This grass cutting machine consists of several components, that is: framework, battery, microcontroller, motor driver, relay 5v, bluetooth module and others. The design result of an android-based lawn mower have a whole dimension with length = 298.89mm, width = 334.88mm and high = 241.02mm.  After static analysis is carried out on the framework obtained results: Displacement minimum 0 mm and displacement maximum 0.0909735 mm, Safety factor minimum 1.93351 and safety factor maximum 15.
VALIDASI SINYAL THREE-STEP SWEPT-SINE PADA VIRTUAL SIGNAL GENERATOR DENGAN PERANGKAT LUNAK LABVIEW Asmara Yanto
Jurnal Teknik Elektro Vol 2, No 2 (2013): Jurnal Teknik Elektro
Publisher : Situs resmi ITP Press

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Abstract

Sinyal Swept-sine adalah sinyal sinusoidal dengan amplitudo tertentu dan memiliki kandungan frekuensi yang berubah terhadap waktu. Sinyal ini sering digunakan pada pengujian FRF (Fungsi Respon Frekuensi) suatu sistem yang dilakukan untuk mengetahui karakteristik dinamik dari sistem tersebut. Sinyal ini dibangkitkan dengan Signal Generator dan dikirimkan ke Shaker untuk mengeksitasi sistem uji. Pada umumnya jenis sinyal Swept-sine yang sering digunakan adalah Linear Swept-sine dan Logarithmic Swept-sine. Pada makalah ini dipaparkan empat buah sinyal Three-step Swept-sine dengan menggunakan perangkat lunak LabVIEW. Keempat sinyal ini adalah sinyal S111, S212, S232, dan S535 Swept-sine. Keempat sinyal ini merupakan pengembangan dari hubungan sinyal Linear Swept-sine dengan kurva magnitudo FRF Sistem Satu Derajat Kebebasan. Penamaan keempat sinyal ini berdasarkan orde polinomial dari fungsi swept yang digunakannya. Keempat sinyal ini dikemas dalam sebuah Virtual Signal Generator dengan perangkat lunak LabVIEW pada komputer. Sinyal Three-step Swept-sine pada Virtual Signal Generator dibangkitkan melalui sebuah DAQ Device. Untuk memvalidasi sinyal Three-step Swept-sine ini dilakukan pencuplikan sinyal sesudah melewati DAQ Device dengan sebuah Picoscope. Rentang fekuensi sinyal yang diuji adalah 0-10 Hz, 0-100 Hz, dan 0-1000 Hz dengan variasi lama pencuplikan sinyal 2 s, 4 s, dan 6 s. Dari perbandingan sinyal yang dicuplik terhadap sinyal yang dibangkitkan diperoleh kesalahan magnitudo sepanjang rentang frekuensi sinyal dan kesalahan waktu swept sinyal. Harga kesalahan magnitudo sepanjang rentang frekuensi sinyal yang diperoleh di bawah 0.15% dan harga kesalahan waktu swept sinyal yang diperoleh di bawah 0.06 %, sehingga keempat buah sinyal Three-step Swept-sine ini dinyatakan valid.
Analysis Of Swept Time And Modal Parameter Effect On FRF’s Magnitude Error Of SDOF System Using Linear Swept-Sine Excitation Asmara Yanto
Jurnal Momentum ISSN 1693-752X Vol 14, No 1 (2013): Volume 14 No 1 Februari 2013
Publisher : ITP Press

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Abstract

Random and swept-sine excitations are the most commonly used excitations in FRF (Frequency Response Function) measurement. There are various type of swept-sine excitation can be used, however, linear swept-sine is often used in FRF measurement. Linear swept-sine excitation is a sinusoidal excitation of which its requencies change linearly within time. This paper presents swept time and modal parameter effect on FRF’s magnitude error of SDOF (Single Degree of Freedom) system using linear swept-sine excitation. FRF’s magnitude error is focused at the peak of FRF’s magnitude error (system’s resonant frequency). Based on analysis study, the peak of FRF’s magnitude error of SDOF system is a function of swept time and system’s modal parameter (resonant frequency and damping ratio).