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Angkasa: Jurnal Ilmiah Bidang Teknologi

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Published by Institut Teknologi Dirgantara Adisutjipto

ISSN : 20859503 EISSN : 25811355 DOI : 10.28989/angkasa

Core Subject : Science,

Computer Science & IT

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Articles 9 Documents

Search results for , issue "Vol 14, No 1 (2022): Mei" : 9 Documents clear

Pemetaan Sebaran Kadar Al2O3 dan RSiO2 Pada Endapan Laterit Bauksit Menggunakan Pendekatan Metode Interpolasi Ordinary Kriging Dan Inverse Distance Weighting Hendro Purnomo; R. Andy Erwin Wijaya
Angkasa: Jurnal Ilmiah Bidang Teknologi Vol 14, No 1 (2022): Mei
Publisher : Institut Teknologi Dirgantara Adisutjipto

ABSTRAK Bauksit, sebagai bijih utama aluminium, mempunyai kualitas yang baik jika mengandung kadar alumina (Al2O2) yang tinggi dan reaktif silika (RSiO2) rendah. Penelitian ini dilakukan untuk memetakan distribusi spasial kadar Al2O3 dan RSiO2 menggunakan metode interpolasi ordinary kriging (OK) dan inverse distance weighting (IDW). Fitting variogram dilakukan dengan model spherical, exponential, dan gaussian, dan pemilihan variogram dilakukan dengan parameter residual sum of square (RSS). Dalam proses interpolasi IDW menggunakan power 1, 2, 3 dan 4. Evaluasi metode interpolasi terbaik dilakukan dengan parameter root mean square error (RMSE) dan mean error (ME). Hasil penelitian menunjukkan bawa metode interpolasi OK lebih baik dibandingkan dengan metode IDW. Peta hasil interpolasi OK menggambarkan bahwa distribusi bauksit dengan konsentrasi kadar Al2O3 â‰¥ 48% dan RSiO2 â‰¤ 5% menempati kurang lebih 50% dari luas daerah penelitian. Distribusi bauksit dengan kadar tersebut masih terbuka dan menerus ke arah utara, barat dan tenggara.Kata Kunci: Bauksit, Variogram, Kriging

Numerical study of drag force on the UAV tilt and fixed wing model during vertical take off landing Muhammad Musyfiq Haikal; Rully Hidayat; Bahrul Jalaali
Angkasa: Jurnal Ilmiah Bidang Teknologi Vol 14, No 1 (2022): Mei
Publisher : Institut Teknologi Dirgantara Adisutjipto

A hybrid vertical take-off landing (VTOL) UAV combines the concepts of fixed-wing and rotary-wing UAV aircraft in one platform while performing in both conventional and vertical take-off landings. This aircraft has a drawback of significant drag force generated due to fixed-wing. Therefore, a Tilt-Wing often utilized to overcome this obstacle whereby it could be adjusted to the vertical and horizontal directions. To enhance the understanding of generated drag force on both wing model, this study was performed by examine the drag characteristic of the VTOL UAV. The simulations were carried out in the wind speed range by 1.4 m/s, 4.17 m/s, and 6.94 m/s. Simulation results showed that the drag of the UAV Hybrid Tilt-Wing and Fixed-Wing increased at the speed of 1.4 m/s to 6.94 m/s while the highest drag value was 177.51 N on a Fixed-Wing UAV aircraft and 1.97 N on a Tilt-Wing UAV aircraft. The result concluded that Tilt-Wing UAV has less drag which was more efficient than fixed-wing.

PITCH PROPELLER QUADCOPTER TYPE X AGAINST THRUST AND VOLTAGE MOTOR TO SUPPORT REGIONAL RESILIENCE Benedictus Mardwianta; Abdul Haris Subarjo; Nurfi Ahmadi; Daniel Setya Budi
Angkasa: Jurnal Ilmiah Bidang Teknologi Vol 14, No 1 (2022): Mei
Publisher : Institut Teknologi Dirgantara Adisutjipto

The small size of the quadcopter and the low inertia of the drone allows the use of a simple flight control system, with the practicality of the Quadcopter it is hoped that it can be used for disaster management so as to increase regional resilience. Quadcopters issued by the company cannot be changed. This research is done by assembling the quadcopter itself and making changes to the propeller pitch to determine the effect of thrust and thrust motor on a quadcopter type x. From the results of research and calculations carried out, the thrust produced with a 50o pitch angle is greater than the 43o pitch angle for each movement, so the greater the pitch angle, the greater the thrust generated by the propeller. . The voltage that enters each motor will be different depending on its movement. So, the greater the voltage that enters the brushless motor, the higher the rotation of the motor so that the thrust generated is also greater.Â Â

Penerapan metode AHP TOPSIS pada pengambilan keputusan rekrutmen anggota organisasi (studi kasus SATSIBER TNI) Achmad Wahyudi; Ahmad Sabri
Angkasa: Jurnal Ilmiah Bidang Teknologi Vol 14, No 1 (2022): Mei
Publisher : Institut Teknologi Dirgantara Adisutjipto

TNI sebagai kekuatan inti pertahanan negara mempunyai unit Satuan Siber TNI (Satsiber TNI). Namun Satsiber TNI mempunyai kendala dalam pemenuhan tenaga sumber daya manusia yang memiliki kualifikasi di bidang siber dan berdampak pada kosongnya beberapa jabatan. Sistem rekrutmen yang berjalan saat ini masih menggunakan metode tradisional. Oleh karena itu, perlu adanya aplikasi sistem penunjang keputusan dalam proses rekutmen Satsiber TNI. Metode yang dapat digunakan dalam membangun SPK adalah metode AHP dan TOPSIS. Tujuan dari penelitian ini membangun sistem penunjang keputusan berbasis website untuk memilih calon anggota Satsiber TNI menggunakan metode AHP dan TOPSIS. Penelitian ini menghasilkan aplikasi sistem penunjang keputusan yang lebih efektif dan efesien dalam proses rekrutmen calon anggota Satsiber TNI.

Geoelectrical resistivity survey to determine sliding surface of landslides prone area case study in Ponjong subdistrict Gunung Kidul regency Indonesia Al Hussein Flowers Rizqi; Oky Sugarbo; Mayang Pitaloka
Angkasa: Jurnal Ilmiah Bidang Teknologi Vol 14, No 1 (2022): Mei
Publisher : Institut Teknologi Dirgantara Adisutjipto

The research area is located in Ponjong Subdistrict, Gunung Kidul Regency. Ponjong area specific at Tambakromo village is one of potential in landslides disaster since 2011. The outspread information about landslide and mitigation should be done in research area. The aim of this research is to get the subsurface condition and determine of landslide surface based on geoelectrical resistivity in Tambakromo area, Ponjong Subdistrict, Gunung Kidul regency. The method of this research is used geoelectrical survey by using Dipole - dipole configuration. The result of this research is the lithology of sliding surface is claystone â€“ fine tuffaceous claystone with resistivity value of 29.9 ohmmeter based on Dipole â€“ dipole subsurface cross section at Grogol village. The sliding surface could be found at 5 metres to 20 metres underground. At Sumberejo village, based on dipole-dipole subsurface the lithology of sliding surface is claystone â€“ fine tuffaceous claystone with resistivity value of 6.18 to 29.9 ohmmeter at depth of 20 to 25 metres. Based on the regional stratigraphy correlation showed that the claystone or tuffaceous claystone is included in Semilir Formation. This research should be able to held for local government to proved landslide mitigation in research area.Â

Peningkatan Efisiensi Penggunaan Bahan Bakar Terhadap Produktivitas Hasil Proses Penyulingan Sereh Wangi Menggunakan Sistem Kohabasi Untuk Mendukung Kegiatan Agro-Industri Eko Poerwanto; Kris Hariyanto
Angkasa: Jurnal Ilmiah Bidang Teknologi Vol 14, No 1 (2022): Mei
Publisher : Institut Teknologi Dirgantara Adisutjipto

One way to isolate essential oils from essential oil-producing plants is by distillation. Distillation is the separation of components in the form of a liquid consisting of two or more kinds of mixtures based on differences in boiling points. The process is carried out on essential oils that are not soluble in water. The distillation process that has been used so far is by using steam and water, because the equipment construction is cheaper and simpler. However, steam and water distillation has a disadvantage, namely that it requires more water vapor. This will result in a certain amount of steam condensing in the plant tissue so that the material will get wetter so that it will increase the use of fuel and will reduce the productivity of the distillation process. To overcome this, it is necessary to strive for a more effective distillation system.This research was conducted with the aim of increasing the combustion efficiency of the essential plant distillation process, namely citronella, so that it is expected to increase the productivity of the distillation. This research was carried out by changing the distillation system using the cohobation system. Boyolali.The results showed that the efficiency of the kohobasi furnace distillation system was 0.85% higher than the steam distillation system, these results were in line with the productivity level of the citronella oil distillation production process, so for the work program of the Guli Village Government it was recommended to use the kohobasi furnace distillation system

Design of Difable Care (DC) mouse as the accessibility of people with hand disabilities Devita Ayuni Kusumaningsih; Akhmad Adham Nur Husaen; Muhammad Zhafran Haidar Muttaqin; Dawi Karomati Baroroh
Angkasa: Jurnal Ilmiah Bidang Teknologi Vol 14, No 1 (2022): Mei
Publisher : Institut Teknologi Dirgantara Adisutjipto

Tuna daksa cacat tangan atau tidak memiliki tangan merupakan sebuah kelainan anggota gerak terutama bagian atas yang menyebabkan gangguan aktivitas yang melibatkan tangan. Di sisi lain, revolusi industri 4.0 menawarkan kemudahan digitalisasi sehingga akses komputer sudah selayaknya bisa dinikmati semua orang. Namun, hal itu tak berlaku bagi tuna daksa cacat tangan terutama yang berprofesi sebagai pelukis. Era digital menuntut mereka mengembangkan lukisan dengan komputer tetapi terhambat pada aksesibilitas komputer khususnya pointer/kursor. Hal inilah yang menjadi inspirasi perancangan Difable Care (DC) Mouse yang didesain berbentuk seperti sandal yang terhubung ke komputer melalui USB wireless. Fitur DC mouse yaitu klik kanan, klik kiri, scroll, dan drag. Metode terdiri atas tahap persiapan, perancangan, serta pelaksanaan dan evaluasi. Prototipe dibuat menggunakan mesin 3D printing berbahan filamen Acrylonitrile Butadiene Styrene (ABS). DC mouse menjadi solusi aksesibilitas penyandang tuna daksa cacat tangan dalam mengoperasikan pointer komputer sehingga mampu meningkatkan produktivitas melukis.

Manufacturing process and experimental study of a small scale archimedes hydro powerplant by varying the number of blade Helmi Fauzan Abdillah; Okto Dinaryanto; Bahrul Jalaali
Angkasa: Jurnal Ilmiah Bidang Teknologi Vol 14, No 1 (2022): Mei
Publisher : Institut Teknologi Dirgantara Adisutjipto

This study investigated the optimum value of Archimedes Screw Turbine (AST) performance by taking into account blades number. This paper also addressed the design approach based on a fixed incline angle of 30Â°, where this paper also addressed the design approach. Variations of the single and double blades were experimentally carried out concerning the turbine power output, torque, and rotation speed. This study's aim was related to the optimum power output between two blade variations, while the manufacturing and design steps were addressed as well. In the design process, the obtained blade length dimension was 0.180 m and 0.269 m for the single and double blades. Furthermore, the overall turbine's length was 1.7m, and the inner and outer of the turbine's radius were 0.069m and 0.128m. Meanwhile, the manufacturing process began with turbine modeling, plate cutting, plate withdrawal (thread formation), welding, and attained finishing process. Based on the experimental result, a double blade turbine generated turbine power by 48.8W at an average rotational speed of 115.3 rpm. Moreover, a single blade turbine produced 37.5W with turbine power averaging a rotational speed of 109.8 rpm. It was obtained that the values of turbine efficiency were 42% and 38% for double and single turbine types, respectively. Based on this finding, it can be suggested that a double blade was more efficient than a single one. This study is beneficial for the design consideration of the AST system.

Pemilihan vendor untuk kegiatan Dredging di blok Mahakam Kalimantan Timur menggunakan metode Analytical Hierarchy Process Aris Prasetiyo; Nur Aini Masruroh; Kusnanto Kusnanto
Angkasa: Jurnal Ilmiah Bidang Teknologi Vol 14, No 1 (2022): Mei
Publisher : Institut Teknologi Dirgantara Adisutjipto

Before carrying out drilling, the rig and its supporting fleet must pass through the swamp area in the Mahakam Block. In order to pass through the area, dredging activities are needed. Mistakes in choosing a dredging vendor will result in delays that incur huge costs. This study aims to determine the right criteria for selecting vendors using the Analytical Hierarchy Process (AHP). By using the open system AHP through a rating approach, any number of vendors will be able to be assessed. The results of the study are the weight of the criteria and the intensity of the rating: the price criterion (weight 0.36) with 3 rating intensities (weight according to the estimate: 1, above the estimate: 0.794, below the estimate: 0.630), the HSE Index criteria (weight 0.263) with 5 rating intensities (excellent weight: 1, good: 0.626, adequate: 0.292, fair: 0.158, poor: 0.138), criteria for production facilities and capacity (weight 0.176) with 3 rating intensities (weight above target: 1, on target: 0.437, below target 0.191), quality criteria (weight 0.113) with 4 rating intensities (very good weight: 1, good: 0.516, adequate: 0.191, poor: 0.135) and financial condition criteria (weight 0.089) with 3 rating intensities (healthy weight: 1, unhealthy: 0.252, bankrupt: 0.159).Â

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