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INDONESIA
Rotasi
Published by Universitas Diponegoro
ISSN : 1411027x     EISSN : 24069620     DOI : -
Core Subject : Engineering,
Mechanical Engineering
Arjuna Subject : -
Articles 676 Documents
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Front Matter Rotasi Vol. 25 No. 4 Oktober 2023 Sari, Ika Ayu Wulan
ROTASI Vol 25, No 4 (2023): VOLUME 25, NOMOR 4, OKTOBER 2023
Publisher : Departemen Teknik Mesin, Fakultas Teknik, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/rotasi.25.4.i-v

Abstract

Perancangan Prototipe Robot Kolaboratif Berbasis Computer Vision untuk Proses Material Handling Setiawan, Muhammad Farouk; Paryanto, Paryanto; Setiawan, Joga Dharma
ROTASI Vol 26, No 3 (2024): VOLUME 26, NOMOR 3, JULI 2024
Publisher : Departemen Teknik Mesin, Fakultas Teknik, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/rotasi.26.3.1-15

Abstract

Robot kolaboratif dalam sektor manufaktur memiliki potensi untuk meningkatkan produktivitas berdasarkan kemampuan robot untuk secara aktif terlibat dalam kerja bersama dengan manusia. Namun demikian, robot kolaboratif yang umumnya digunakan merupakan robot khusus yang didesain untuk menjalankan kolaborasi. Sehingga pada penelitian ini mengajukan sebuah rancangan robot kolaboratif yang dapat digunakan pada berbagai jenis robot manipulator dengan memberikan kemudahan dalam hal pengaturan dan penggunaan untuk user. Adapun rancangan robot kolaboratif menggunakan prototipe robot manipulator dengan menerapkan computer vision sebagai konsep utama dalam menjalankan kolaborasi pada proses material handling. Hasil yang diperoleh robot dalam menjalankan kolaborasi tersebut adalah dengan tingkat kesuksesan 92% untuk peletakan objek secara satu per satu dan 84% untuk peletakan objek secara terus menerus, dan sistem keamanan dari robot menghasilkan sistem yang cukup baik untuk dapat mengatasi adanya tabrakan antara robot dan user. Hasil-hasil ini menunjukkan bahwa robot dapat melakukan kolaborasi dengan baik dengan konsep yang paling sederhana yang dapat diterapkan, yaitu tanpa memerlukan banyak proses yang rumit, perhitungan yang rumit, dan penggunaan berbagai peralatan tambahan selain sebuah kamera.
Back Matter Rotasi Vol. 26 No. 3 Juli 2024 Sari, Ika Ayu Wulan
ROTASI Vol 26, No 3 (2024): VOLUME 26, NOMOR 3, JULI 2024
Publisher : Departemen Teknik Mesin, Fakultas Teknik, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/rotasi.26.3.i-v

Abstract

Control Design of Automatic Inflatable Vest for Deep Pressure Therapy Husaini, Farhan; Maula, Mohammad; Ammarullah, Muhammad; Afif, Ilham; Lamura, M Danny; Winarni, Tri Indah; Jamari, J
ROTASI Vol 26, No 1 (2024): VOLUME 26, NOMOR 1, JANUARI 2024
Publisher : Departemen Teknik Mesin, Fakultas Teknik, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/rotasi.26.1.28-34

Abstract

This research focuses on enhancing the control system of the commercial inflatable vest to optimize pressure regulation for deep pressure therapy (DPT) in children with autism spectrum disorder (ASD). The main goal is to provide a safe and reliable DPT experience with calming effects. The proposed control system incorporates a feedback loop mechanism to maintain the desired pressure level and includes safety features to prevent overinflation. The study dis-cusses the development of the pressure control system, covering both hardware and software components. Experimental results demonstrate the system's effectiveness in maintaining the target pressure with the average error is 1.531%. This study has successfully advanced deep pressure therapy devices, emphasizing the significance of automatic pressure control that meets the criteria for medical gas pressure (error no greater than 5%) and incorporates safety features as a therapy device.
Simulasi Dinamika dan Uji Penerimaan Komunikasi Antena Penjejak Satelit POES Setiawan, Joga Dharma; Haryanto, Ismoyo; Kurnianto, Andhieka Rizky
ROTASI Vol 26, No 2 (2024): VOLUME 26, NOMOR 2, APRIL 2024
Publisher : Departemen Teknik Mesin, Fakultas Teknik, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/rotasi.26.2.53-61

Abstract

Studi ini bertujuan untuk memvalidasi gerak penjejak satelit orbit bumi rendah (LEO) dengan perangkat lunak Systems Tool Kit (STK) dan membandingkan gerakan azimuth dan elevasi dengan data dari website penyedia penjejak satelit seperti www.n2yo.com, lalu membuat model animasi dalam Matlab/Simulink menggunakan data simulasi dari software STK dan menentukan lintasan sudut azimuth yang diinginkan serta memastikan gerakan antena dalam batas-batas ruang yang tersedia secara aktual. Selanjutnya sistem kontrol antena penjejak satelit ini diimplementasikan untuk menentukan hubungan antara durasi komunikasi data dengan maksimum elevasi, daya yang diterima dan menghasilkan gambar permukaan bumi dari hasil penerimaan komunikasi data. Penelitian ini menggunakan fasilitas yang disediakan oleh satelit LEO POES (Polar-Orbiting Environmental Satellites) yaitu NOAA-15, 18 and 19. Secara khusus hasil uji coba penerimaan transmisi gambar dari NOAA-18, telah berhasil didapatkan beberapa gambar untuk ditampilkan, yaitu gambar asli berwarna hitam dan putih, contrast A, MSA (multi spectral analysis), suhu permukaan laut, dan thermal.
Experimental Study : Thermal Variations and Pressure's Impact on Plastic Injection Molding Quality Leksonowati, Nur Fitria; Pamungkas, Nurman; Manurung, Meilani Mandalena
ROTASI Vol 26, No 3 (2024): VOLUME 26, NOMOR 3, JULI 2024
Publisher : Departemen Teknik Mesin, Fakultas Teknik, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/rotasi.26.3.50-56

Abstract

This study investigates the effects of varying hot water temperatures (75℃, 85℃, and 95℃) and injection pressures (328 Bar and 928 Bar) on the outcomes of experimental tests in injection molding. Results indicate that at 75℃, 85℃, and 95℃ with an injection pressure of 328 Bar, the product displayed a Short Mold defect despite a slight increase in mass. At 75℃ with an increased injection pressure of 928 Bar, a White Line defect was observed, while at 85℃ and 928 Bar, a defect-free part was produced with optimal mass. However, at 95℃, a Bright Color defect was evident, leading to part rejection despite a slight mass increase. The findings highlight the significance of meticulous parameter selection, with an optimal combination identified as 85℃ hot water temperature and 928 Bar injection pressure for defect-free production in injection molding processes. 
Pemanfaatan Bubble Flame Untuk Implementasi Proses Brazing Setyoko, Adi Tri; Widyanto, Susilo Adi; Haryadi, Gunawan Dwi
ROTASI Vol 25, No 4 (2023): VOLUME 25, NOMOR 4, OKTOBER 2023
Publisher : Departemen Teknik Mesin, Fakultas Teknik, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/rotasi.25.4.60-67

Abstract

Abstract In the current era of industrialization, welding technology plays a very important role in the manufacturing or metal joining and assembly industry, one of which is brazing. Brazing is the process of joining specimens using metal and filler that melt in the liquid phase, while the base metal used has a melting point above the filler through heat distribution and the use of filler metal. The aim of this research is to investigate the tensile and bending test strength, from the application of the bubling method and to determine the optimal fuel in the brazing process. The connection model in this research is the lap joint type. The results of research on the brazing process using the bubling method obtain a constant temperature output, so that the filler metal can melt evenly. From the bending test and tensile test results data for each specimen using traditional brazing welding and the bubbling method for Pertalite and Pertamax fuels shows varied results. The bending stress experienced a graph of successive decreases, namely 2.92Mpa for Specimen A, 2.92Mpa for Specimen B and 2.57Mpa for Specimen C. However, in contrast to the resulting tensile stress, there was a graph of increase respectively, 20.87Mpa for Specimen A, 21.76Mpa. specimen B and peak with 34.59Mpa for specimen C. Then the optimal fuel which produces optimal combustion in the brazing process using the bubling method is Pertamax.
Back Matter Rotasi Vol. 26 No. 1 Januari 2024 Sari, Ika Ayu Wulan
ROTASI Vol 26, No 1 (2024): VOLUME 26, NOMOR 1, JANUARI 2024
Publisher : Departemen Teknik Mesin, Fakultas Teknik, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/rotasi.26.1.App. 1-4

Abstract

Uji Performance Alat Uji Pengereman Kereta Cepat Untuk Kecepatan 160 km/jam Bakhri, Mohammad Samsul; Rusnaldy, Rusnaldy; Paryanto, Paryanto
ROTASI Vol 26, No 3 (2024): VOLUME 26, NOMOR 3, JULI 2024
Publisher : Departemen Teknik Mesin, Fakultas Teknik, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/rotasi.26.3.16-22

Abstract

Indonesia is currently developing an international standard high-speed train industry. One of the important components of the fast train is the braking system. The fast train braking test rig at Diponegoro University has a speed of 160 km/h using a pneumatic braking system accompanied by disk brake and brake pad components for high speed. The performance test of the fast train braking test equipment needs to be done to find out if the test rig is in accordance with PT INKA standards and ensure it is safe to test. The purpose of this research is to test the performance of the braking test equipment, including the deceleration, braking distance, and mechanical vibration criteria. Measurement of deceleration and braking distance is carried out using a tachometer sensor and stopwatch, while mechanical vibration is measured using a vibration meter. The test results of deceleration and braking distance obtained were then compared with PT INKA standards, and the results of vibration signals obtained were then compared with ISO 10816 vibration level standards. The results showed that in normal braking conditions with a pressure of 3.8 bar, the average value of deceleration was 1.44 m/s2 , and the braking distance was 684 m. In emergency braking conditions with a pressure of 5 bar, the average value of deceleration was 2.70 m/s2 , and the braking distance was 365 m. The resulting mechanical vibration shows on bearing 1 the average Vrms value on the horizontal accelerometer of 0.03 in/s, the vertical accelerometer of 0.01 in/s, and the axial accelerometer of 0.01 in/s, and on bearing 2 the average Vrms value on the horizontal accelerometer of 0.02 in/s, the vertical accelerometer of 0.01 in/s, and the axial accelerometer of 0.01 in/s. From these vibration results, it can be concluded that the vibration conditions in accordance with ISO 10816 are safe to operate.
Accuracy Assessment of Azimuth, Elevation, and Time data resulted from using actual TLE and simulated-outdated TLE for tracking LAPAN-A2 Satellite Setiawan, Joga Dharma; Ilham F, Muhammad Ario; Haryanto, Ismoyo; Muhida, Riza
ROTASI Vol 25, No 4 (2023): VOLUME 25, NOMOR 4, OKTOBER 2023
Publisher : Departemen Teknik Mesin, Fakultas Teknik, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/rotasi.25.4.%p

Abstract

This study aims to assess the pointing accuracy of a directional antenna at a ground station using outdated Two-Line Element sets (TLEs) to track an equatorial Low-Earth Orbit (LEO) satellite, LAPAN-A2,  using AGI System Tool Kit (STK) software by analyzing the Azimuth, Elevation, and Time-lapse (AET). Simulations were performed using 1, 3, 6, and 12-month outdated TLEs.  Validation was successfully conducted at the initial work by comparing the orbital parameter data extracted from n2yo.com  to the STK simulation results using an updated TLE. It was found that maximum pointing errors using 1, 3, 6, and 12-month outdated TLEs, respectively, were: for the Azimuth 32º, 38º, 167º, and greater than 173º; for the Elevation: 5º, 8º, 7º, and greater than 73º; for the Time-lapse: 24, 35, 488, and 1052 seconds. It can be argued that the maximum pointing errors for up to the three-month outdated TLE are considered small such that a good communication quality between the ground station with a standard directional antenna could still be feasible. However the results of this study is limited only for a selected location in Central Java province in Indonesia. These findings have important implications for real-time satellite tracking when the ground station location becomes remote and disconnected from the internet network due to certain circumstances, such as natural disasters or other kinds of disruption, in which updating TLEs is not possible for a while.

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