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Force Reduction of Circular Cylinder using Square Disturbance Body at 600 Angle by 2D Numerical Simulation Unsteady-RANS Nofriyandi, R; Sumiati, Ruzita; Putra, Meiki Eru; Rina, Rina
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Publisher : Kopertis Wilayah X

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Abstract

Drag is an aerodynamic force that appears when the flow past the bluff body circular cylinder. Drag strongly influenced by the flow separation point. One of the ways reducing the drag force that is to control the flow by placing the disturbance body on the upstream side at a certain angle. Previous research has found at 60º angle of flow separation is faster than a single cylinder that produced greater drag. Therefore, this research was conducted to reduce the drag force on the corner with disturbance dimension variation. This research was carried out numerically using a FLUENT 6.3.26 CFD software in 2D unsteady viscous-RANS models Turbulence Model-Shear-Stress Transport (SST) k-ω in a narrow channel. The geometry is simulated in a circular cylinder as the main body and the square cylinder as a disturbance body being placed in front of the main body by 0.16 s/D ratio. Dimensions of disturbance body varied at (s) 0,1; 0,2; 0,3; 0,4 dan 0,5 mm with a gap (δ=0,4mm). Reynolds number based on the diameter of the cylinder, ie ReD 2,32x104. The simulation results show that the transition flow on shifting 60º SDB angle for all SDB dimensional variations do not produce turbulent. The best of drag force reduction in this configuration occurs on a cylinder at 0.2 mm disturbance dimensions is 48%.
Pengukuran Objek 2 Dimensi Dengan Menggunakan Kamera Berbasis LabVIEW Khairul Amri; Ruzita Sumiati
Jurnal Teknik Mesin Vol 11 No 2 (2018): Jurnal Teknik Mesin
Publisher : Politeknik Negeri Padang

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Abstract

Quality Control (QC) is one of the most important components in the manufacturing process. The aim is to determine whether a product is feasible to market. One aspect of QC is the size / dimension of the object to be made. If the size is still within the range of tolerance, then it has passed the QC in terms of size, but if not then it includes a failed product. The problem encountered is that it takes a long time to take measurements, especially objects in the third dimension where each part is different as microdrill, zipper etc. To overcome this weakness, a CCD camera is used as a sensor to record images and then use LabVIEW software to analyze the size of the recorded image. This is a preliminary study so that it is only done for objects with two dimensions with square and circular shapes. From the research that has been done, the measurement with the camera gives results that are almost the same as the use of calipers where the standard deviation fluctuates from 0.3 to 23.8 for circles and 0.54 to 32.05 for squares. Furthermore, the time needed to do one measurement process with the camera ranges from 201 ms to 338 ms whereas using the calipers takes 3 to 5s
Pengujian Turbin Angin Savonius Tipe U Tiga Sudu Di Lokasi Pantai Air Tawar Padang Ruzita Sumiati
Jurnal Teknik Mesin Vol 9 No 1 (2012): Jurnal Teknik Mesin
Publisher : Politeknik Negeri Padang

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Abstract

Sumber energy terbesar yang dimanfaatkan saat ini masih dominan berasal dari fossil. Sumber energy fossil bersifat non renewable sehingga lama kelamaan akan habis dan energy fosil juga tidak ramah lingkungan karena menghasikan gas CO2 . Oleh karena itu saat ini sangat banyak penelitian dilakukan tentang energi terbarukan agar mendapatkan sumber energy baru yang memiliki dampak positif bagi lingkungan dan bersifat renewable. Salah satu sumber energi terbarukan yang ramah lingkungan dan mudah untuk didapat adalah energi angin. Penelitian ini membahas tentang pemanfaatan energy angin sebagai penghasil listrik dengan menggunakan turbin angin savonius. Tujuan yang hendak dicapai adalah mengetahui unjuk kerja turbin angin savonius tipe U tiga sudu melalui pengujian terhadap variable ukur yaitu kecepatan angin, kecepatan putar rotor dan daya yang dihasilkan alternator. Lokasi pengujian di pantai Air Tawar Padang. Dari hasil pengujian didapatkan putaran maksimum rotor adalah 196 rpm pada kecepatan angin 7,9m/s, besar daya 126 watt. Untuk putaran minimum rotor 53 rpm pada kecepatan angin 2,7 m/s tidak mampu menghasilkan daya karena putaran pada poros alternator setelah melewati system transmisi menjadi 156 rpm sehingga tidak mampu membangkitkan listrik, dimana spesifikasi alternator yang dipakai baru mampu menghasilkan listrik jika putaran besar dari 300rpm.
Pembuatan Simulator Power Steering Beserta Troubleshooting Riezky Idvi Alfitra; Ruzita Sumiati; Nusyirwan Nusyirwan; Adriansyah Adriansyah
Jurnal Teknik Mesin Vol 12 No 1 (2019): Jurnal Teknik Mesin
Publisher : Politeknik Negeri Padang

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In this Final Project report, a little is explained about the parts of power steering and how to make the vehicle comfortable, especially when the vehicle turns. Stability and comfort in driving a vehicle is very important and desirable for all motorists, how it can be obtained. Power steering makes the driver feel light in controlling his vehicle especially when turning. So power steering is one of the things that is very important to get driving comfort. Therefore maintenance of the power steering is also important to be able to help realize stability and comfort in driving. In addition to the care also considered in the use of spare parts must be in accordance with the standards used in the vehicle
ANALISA MASALAH COOLING SYSTEM ENGINE 3306 UNIT D6D DOZER CATERPILLAR Yogi Kogama; Ghandy Junne Putra; Ruzita Sumiati; Yanziwar Yanziwar
Jurnal Teknik Mesin Vol 3 No 1 (2020): Vol.3 NO 1. (2020) Jurnal Teknik Mesin
Publisher : P3M- Politeknik Negeri Kupang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32511/jtm.v3i1.707

Abstract

Cooling system merupakan salah satu sistem yang mempengaruhi performance dari engine. Cooling system berfungsi untuk menjaga kondisi temperatur engine agar tetap normal, berkisar antara 1920F (890C). Untuk mengidentifikasi gejala kerusakan yang terjadi pada komponen cooling system yang menyebabkan over heating yaitu dengan cara troubleshooting cooling system. Terjadinya masalah over heating pada Engine 3306 Dozer Caterpillar, ditandai dengan adanya pergerakan jarum temperature engine yang bergerak menuju batasan maksimum temperature engine. Untuk mengetahui penyebab kerusakan, maka dilakukanlah 8 langkah troubleshooting. Berdasarkan hasil troubleshooting, ditemukan bahwa kurangnya coolant pada radiator dan setelah dilanjutkan dengan pembongkaran cooling system engine ditemukan rusaknya thermostat dalam keadaan tertutup dan retaknya liner engine. Untuk memperbaiki agar masalah pada cooling system kembali normal , maka dilakukanlah penggantian thermostat dan liner dengan yang baru. Agar masalah tidak terjadi lagi maka lakukanlah perawatan secara berkala pada unit maupun engine dan terutama gunakanlah coolant conditioner pada engine agar cooling system pada engine bekerja dengan baik
Pengujian Kincir Air Hidrokinetik Undershoot Di Irigasi Limau Manis Padang Ruzita Sumiati; Fardinal Fardinal; Nusyirwan Nusyirwan; Adriansyah Adriansyah; Robby Novrizal
Jurnal Teknik Mesin Vol 12 No 1 (2019): Jurnal Teknik Mesin
Publisher : Politeknik Negeri Padang

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Abstract

The power produced by a hydrokinetic turbine depends on the interaction between the rotor and water. Therefore, the optimal rotor geometry must be designed and built to capture maximum water energy and convert it into usable energy. Hydropower is one of the potential renewable energy that can contribute to the need for electricity. Hydropower generator is pollution free so this generator can answer environmental problems and the availability of renewable energy sources. The aim to be achieved in this study is to produce a turbine hydropower with good performance if it operates on an irrigation channel and is applied as a power plant. This research was developed to get the right specifications for the use of hydrokinetic turbines in the irrigation canal area. There are several methods carried out in the design of hydrokenetic turbines, namely by designing blades based on the shape of water flow, repairing the transmission system, and selecting the right generator. In this study, we tested the sweet lemon irrigate applied and tested in the area of ​​Padang Sumbar Sweet Limes Pauh, the results obtained were that the turbine can produce power of about 12.6 watts.
RANCANG BANGUN MINIATUR TURBIN ANGIN PEMBANGKIT LISTRIK UNTUK MEDIA PEMBELAJARAN Ruzita Sumiati; Aidil Zamri
Jurnal Teknik Mesin (JTM) Vol 3, No 2 (2013)
Publisher : LP2M - Institut Teknologi Padang

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Abstract

Wind turbines convert the kinetic energy in wind into clean electricity. When the wind spins the wind turbine's blades, a rotor captures the kinetic energy of the wind and converts it into rotary motion to drive the generator. Wind electric systems are one of the most cost-effective home-based renewable energy systems with zero emissions and pollution. Many factors that influence the performance of wind turbines such as wind speed, blade shape, and number of blades. In Generator, Coil number of turn (N) also influence performance of wind turbine. Manufacture of wind turbine prototype as a learning medium to facilitate students in understanding the concept of wind electric system. Results of the test prototype wind turbine if the wind speed the greater the resulting voltage will be higher, the Coil number of turn (N) also affects the voltage generated.
RANCANG BANGUN MESIN PULPER KOPI MENGGUNAKAN PENGGERAK MOTOR LISTRIK Tri Ego Wiranata; Ruzita Sumiati; Rakiman Rakiman; Yuli Yetri
Jurnal Teknik Pertanian Lampung (Journal of Agricultural Engineering) Vol 10, No 1 (2021): Maret
Publisher : The University of Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtep-l.v10i1.26-32

Abstract

Design and manufacture of coffee pulper machines have been carried out with the aim of completing the needs of the coffee farmer groups when harvesting in the Kayu Aro area, Kerinci. The steps in designing and manufacturing a coffee pulper begins with a literature study, design and calculation, the process of making the tool and ends with testing the tool. Engineering drawing design is done by modeling in SolidWorks software. Coffee peeler machine with a capacity of 4 kg/min, with a machine size of 730 mm x 320 mm x 1040 mm, using an electric motor 1 HP 1420 rpm, with a frame using an elbow profile 40 mm x 40 mm x 3 mm. The transmission system uses an electric motor with an initial rotation of 1420 rpm to 364.6 rpm. In the 2 pulley component D = 74.6 mm and 290.5 mm, V-belt type B No.52, 1 solid shaft D = 25 mm. Initial test results using 2–5 kg of wet coffee beans take 30.07–77.20 seconds, and the skin has separated from the beans cleanly. These results show that the engine capacity is 235.62 kg/h, so that the desired target is met with relatively low operating costs. The existence of this tool will be able to help the process of separating the skin and coffee beans, so that the quality of coffee production will increase.      Keywords:  coffee, coffee machine, design and construction, farmer groups
Pembuatan Dan Pengujian Mesin Bending Rotary Baja Untuk Aplikasi Stand Pot Bunga Diameter 8 dan 10 Inch Ruzita Sumiati; Genta Ramadeto; Rakiman Rakiman; Fardinal Fardinal
Jurnal Teknik Mesin Vol 13 No 1 (2020): Jurnal Teknik Mesin
Publisher : Politeknik Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30630/jtm.13.1.363

Abstract

In this day and age people decorate homes with flower pots and many models of flower pot place creations. Usually the place to put flower pots in the form of a circle and to make a circular iron is made manually requires energy and a long time. A bending machine is needed to make concrete iron circle creations. The aim of this research is to produce a rotary bending machine that is able to work efficiently in forming a concrete steel circle. The method used in this study is a practical method that is doing machine design and continued with the manufacture and field testing. The working principle of this machine is to use a motor that functions to move the Gearbox and continue the rotation to the shaft, then the shaft rotates and the bending mall rotates and makes the steel concrete come round and circular. The conclusion is (a). This concrete steel rotary bending machine has dimensions of 550 mm x 550 mm x 1000 mm with an electric motor drive power source (b). The results of the bending process using a concrete steel rotary bending machine are far more efficient than doing manual bending
RANCANG BANGUN MICRO TURBIN ANGIN PEMBANGKIT LISTRIK UNTUK RUMAH TINGGAL DI DAERAH KECEPATAN ANGIN RENDAH Ruzita Sumiati; Khairul Amri; Hanif Hanif
Prosiding Semnastek PROSIDING SEMNASTEK 2014
Publisher : Universitas Muhammadiyah Jakarta

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Abstract

Energi angin merupakan salah satu potensi energi terbarukan yang dapat memberikan kontribusiterhadap  kebutuhan  energi  listrik  rumah  tinggal.  Pembangkit  energi  angin bebas  polusi  (CO2)maka pembangkit ini dapat menjawab masalah lingkungan hidup dan ketersediaan sumber energysifatnya dapat diperbaharui (renewable) serta penelitian ini mendukung program pemerintah kotaPadang untuk menjadi lumbung energy terbarukan. Tujuan yang ingin dihasilkan adalah dibuatnyasebuah turbin angin  dalam kapasitas kecil (micro) yang dapat membantu menyuplai listrik sebuahrumah tinggal  dan mampu beroperasi di daerah  kecepatan angin rendah kemudian dapat di set uppada  atap  rumah.  Metodologi  yang  digunakan  untuk  pencapaian  tujuan  adalah  metodaeksperimental  dengan  tahap-tahapan  sebagai  berikut  pengambilan  data  angin  lapangan;  disainturbin angin; pemilihan bahan; pembuatan turbin angin dan pengujian alat.  Kota Padang Sumbartermasuk wilayah yang memiliki kecepatan angin rendah antara 2-6 m/s, maka jenis turbin anginyang cocok adalah  turbin angin tipe savonius karena bisa berputar pada kecepatan angin rendah(low  wind  velocity)    dengan  putaran  awal  (starting)  dapat  terjadi  pada  kecepatan  2m/s  sertakonstruksinya yang sangat sederhana. Disain  turbin yang dibuat adalah berbentuk savonius 2 sududengan  konstruksi  overlap  antara  kedua  sudu  dengan  tujuan  untuk  memanfaatkan  tekanan  anginbalikan dari sudu satu  ke sudu kedua dan sebaliknya sehingga dapat meningkatkan putaran  rotor.Rancangan  turbin  savonius  di  buat  4  tingkat.  Bahan  yang  digunakan  untuk  sudu  turbin  adalahaluminium  dan  jenis  poros  hollow.    Generator  yang  dipakai  adalah  generator  magnet  permanenPanasonic  400watt  yang  dapat  menghasilkan  daya  pada  putaran  rendah  (150  rpm)  ;  Untukmeningkatkan rpm yang sampai ke generator digunakan system transmisi sabuk dan pully denganperbandingan  transmisi  5:1.  Kemudian  tipe  bearing  yang  digunakan  adalah  ball  bearingbearing.Dari hasil pengujian didapat daya maksimum yang dihasilkan adalah 7,7watt dengan putaran rotor340rpm dengan kecepatan angin 5,68m/s dan Cp 0.3