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Journal : Journal of Ocean, Mechanical and Aerospace -science and engineering- (JOMAse)

The Application of Numerical Study for Dynamic Vibration Absorber in Suspension System to Improve Four Wheel Vehicle Comfort Hafizah, Hafizah; Mainil, Rahmat Iman; Abdurrahman, Ridwan; Nazaruddin, Nazaruddin
Journal of Ocean, Mechanical and Aerospace -science and engineering- Vol 69 No 1 (2025): Journal of Ocean, Mechanical and Aerospace -science and engineering- (JOMAse)
Publisher : International Society of Ocean, Mechanical and Aerospace -scientists and engineers- (ISOMAse)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36842/jomase.v69i1.384

Abstract

This study aims to develop a Dynamic Vibration Absorber (DVA) for a four-wheeled vehicle, specifically the "Toyota Fortuner 4.0 V6 SR" model. The quarter vehicle structure was modeled as a two degree of freedom system with disturbances in the form of road contours and speed. The natural frequency of the DVA was designed to be equal to the lowest natural frequency of the vehicle. Hence, if the vehicle moved at a speed or road contour disturbance close to its natural frequency, the vibration energy will be transferred or received by the DVA so that the vehicle structure did not oscillate. Two DVAs were mounted on the top of the vehicle body. The results obtained the vibration that occurs when the disturbance frequency was closed to the lowest natural frequency of the ¼ vehicle structure. It was significantly reduced by the addition of two DVAs. The design model of the ¼ vehicle test structure and Dynamic Vibration Absorber (DVA) in this study can be used as a reference for the implementation of experiments. The results of experimental calculations can be compared with the results of theoretical calculations to strengthen the credibility of the results.
Modification and Testing System Control and Swing Model Excavator System Nazaruddin, Nazaruddin; Suhandi, Anang
Journal of Ocean, Mechanical and Aerospace -science and engineering- Vol 25 No 1 (2015): Journal of Ocean, Mechanical and Aerospace -science and engineering- (JOMAse)
Publisher : International Society of Ocean, Mechanical and Aerospace -scientists and engineers- (ISOMAse)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36842/jomase.v25i1.431

Abstract

One of the heavy equipment that play role in development projects is the excavator. An excavator can perform construction work such as digging, splitting, loading and so on. Laboratory of Hydraulics and Pneumatics Mechanical Engineering Faculty of Engineering, University of Riau has produced a model excavator using pneumatic system, support on a controller box, equipped with buttons setting and motion rotary swing 120°. The research has modifications control system, remove the control box under the excavator and change to the remote system. The motion rotary swing system has changed from 120° to 360°. The purpose is all movements similar in general excavator. The result, excavator model using power 12V DC the control system and compressed air drive pneumatic system. The results of testing control system work to properly, the rotary motion of the swing system 360° and use electric voltage 7,5V will have speed 13,598 rpm, so swing motion from the excavator model similar in general.
Development of a Python-Based Decision Support System for Evaluating Biomass Price Feasibility in Co-Firing Applications: Evidence from Riau, Indonesia Ramadhan, Aulia; Susilawati, Anita; Nazaruddin, Nazaruddin
Journal of Ocean, Mechanical and Aerospace -science and engineering- Vol 69 No 2 (2025): Journal of Ocean, Mechanical and Aerospace -science and engineering- (JOMAse)
Publisher : International Society of Ocean, Mechanical and Aerospace -scientists and engineers- (ISOMAse)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36842/jomase.v69i2.542

Abstract

The utilization of biomass as a co-firing fuel in coal-fired power plants is a strategic element in Indonesia’s energy transition. A key challenge lies in accurately assessing the price feasibility of biomass fuel (B3m) and ensuring policy compliance. This study presents a Python-based Decision Support System (DSS) equipped with a graphical user interface (GUI) to compute and evaluate the Highest Benchmark Price (HPT) of B3m adaptively, including a maximum price coefficient (k =1.2). The system was tested using 12 actual proposals from B3m suppliers in Riau Province. Results indicate that 58.3% of offers complied with regulatory thresholds, with wood-based B3m proving generally more competitive than palm-based feedstocks. The system enables automated and transparent price feasibility classification. These findings highlight the potential of localized Python-based computational tools to support economic evaluation of renewable energy deployment.
Co-Authors . Zulfan AA Sudharmawan, AA Abd, Misswar Abd, Miswar ABRIANO, NOVA Achmad, Fariz Afifi, Muhammad Ridho Afrizal, Efi Agung, Nabilah Putroe ahmad yani Aini, Yusnifa Aiyub Aiyub Akbar, Mufid Akhrizal Awaludin Akmal Al Munawar, Hasby Al Munawir Alchalil Alchalil ALDIANSYAH, TEUKU Alfiady, Teuku Alwi Alwi Amaro, Moegiratul Amelia, Farissa Amri, Sahibul Andas, Amzal Mortin Andik Bintoro Anisa Purnamasari Anita Susilawati anwardi, anwardi Apriyanti Apriyanti Ardiyansyah, Amzar Ari Nofitasari Arie Budiansyah arif, zainal - Arini Anestesia Purba Arlina Arlina, Arlina Arman Sayuti Armand, Ratu Meisha Asbath Said Asma Liza, Lia Astini, Astini Audina, Nabillah Azura, Rosiana Baiq Rien Handayani, Baiq Rien Bangsa, M. Theo Ari Basrul, Basrul Beočanin, Anđelija Binawati Ginting Bur, M Burrahman, Habi Candra candra Candra, Rudi Arif Cece Indriani Chalirafi, Chalirafi Cupu, Dedi Rosa Putra Cut Ita Erliana Cut Nila Thasmi, Cut Nila Dahlan Abdullah Dayusman, Edo Alvizar Deddy Satria M Dedi Krismiadi Depita Kardiati Dewi, Risna Dharma, Satrio Arya Dhiauddin Dhiauddin, Dhiauddin Dian Herdiana Dian Rahmita Sari Dianti, Devi Dwi Wulandari Ningtias Purnama Dwinna Aliza Edi Putra Kelana Efendi, Anna Gustika Effendy, Amalia Eka Safitri Ekadamayanti, Agustia S. Elya Antariksana Bachmida Eril, Eril Fadillah, Nurul Aini Fahmi, Asrul Farsiah, Laina Fatimatuzzahrah, Baiq Shofi Fauzan . Fawwaza, Nasywa Febrian, Fadly FIRDAUSA, SARAH Fitri Annisa, Suci Fitriana, Yulia Rahma Fridarti, Fridarti Fuady Fuady, Fuady Ginta Riady Hafizuddin Hafizuddin Hamdy, Muhammad Ihsan Hamzah, Muhammad Luthfi Handika, Puri Tri Harahab, Tri Winarti Harpito, Harpito Harpito,, Harpito Hartati, Misra Hartisyah, Nurul Hartono Hartono Hasan, Denny Irmawati Hasyem, Muhammad Hayati, Husna Heltty Heltty Heltty, Heltty Hendra Hendra Hendra Zufry, Hendra Henni Fitriani Husaini Husaini Husnurrizal, Husnurrizal Ihsan Hamdy, Muhammad Ihsanhamdy, Muhammad Ikhsan Hamdy, Muhammad Ilham, Dirja Nur Indra Gumay Febryano Indriani, Cece Intan, Anni Intan, Seli Venny Irwansyah, Defi Iskandar Iskandar Ismail, Aidil Ismu Kusumanto Isnaini , Muhammad Jannah, Firaihanil Johari Johari Juli Melia Julistia, Rini Kamarlis, Reno K. Kencanadewi, Baiq Citra Khaira, Alfi Krismurniati, Elisabeth Devi Kurniasy, Dessy Kuswandono, Kuswandono L. Lisnawati Laka, Oktafatahna Laksono Djoko Nugroho Lazardo, Iqbal Lestari, Sari Arie Lubis, Fitriani Surayya Lubis, Fitriani Surraya Lubis, Fitriyani Surayya Lubis, Risda M. Badaruddin, M. Badaruddin M. Hasan M. Thorikquljannah, M. Thorikquljannah M. Yusuf Mahalla, Mahalla Mahar Arifin Maharani, Anggun Mahdi, Umar Mahyuddin, A. I Maimun Maimun Mardiana, Linda Marianah, Marianah Martiwi Sukiakhy, Kikye Maryam Maryam Maulana, Rahman Gustian Maulina, Fury mauludi, mauludi Md Sani, Nor Diyana Meiliati, Herriyzka Meilita Tryana Sembiring, Meilita Tryana Meliyana Meliyana, Meliyana Misbullah, Alim Mispan, Mispan MK, Muhammad Mudatsir, Ahmad Muhammad Fazil, Muhammad Muhammad Ikhwani Muhammad Iqbal Muhammad Nur Muhammad Rizki Muhammadun, Haris Muharramsyah, Rambang Mujiburrahman Mujiburrahman Muliadi Mulkan, Andi Mulyadi Adam, Mulyadi Murbo P, Fajar Panjalu Murniati . Mursyida, Waliam Muryali, Muryali Muslem Muslem, Muslem Muzailin, Muzailin Nabilla, Ghaitsa Nanda, Evita Dwi Nasrullah Idris Nasution, Mirza Natasha, Cut Alia NAZARUDDIN, SALSABILLA LATANSA ND, Muhammad Authar Nizamuddin Nizamuddin Nofirza Nofirza Nora Maulina, Nora Noviati Noviati Nur Ahyani Nuraini Fatmi, Nuraini Nurdin Nurdin Nurhaida Nurhaida Nurhayati Nurhayati NURLIANA NURLIANA Nurlianah, Nurlianah Nurul fadillah, Nurul Onal Sahrizal Paksi, Satria Icha Perdana, Mirwan Surya Pongdatu, Merry Prabowo, I Putu Deny Arthawan Sugih Prasetyo, Tegar Pratiwi , Dewi Sari Purnamasari, Anisa Putra, Afriadham Putri, Feby Ananda Qabul Dinanta Utama Rabiatul Adawiyah Rafiqah Rahim Sya’ban, Abdul Rahmah, Puja Rahman, Soleh Rahmat Dwi Cahyo, Rahmat Dwi Rahmat Iman Mainil Rahmat, Abmierdal Rahmawati, Rahmawati Rahmi, Yulia Raihan Rajai, Afdhalul Ramadha, Akhmad Riddo Ramadhan, Aulia Ramdani, Sigit Rani Rasudin, Rasudin Rasyidin Rasyidin Razali Daud Renaldi, Muhammad Reza Pahlevi Ginting Riantofani, Riantofani Ridwan Abdurrahman Rika Taslim Rinaldi Idroes Rizki, Eis Nur Romantika, I Wayan Roslizawaty Roslizawaty, Roslizawaty Rosmaidar Rosmaidar, Rosmaidar Sahyunan, Sahyunan Samudra, J Saputrayadi, Adi Sarbaini Sarbaini Sari Arie Lestari Sari, lilia Satrio, Tedy Sawitri, Harvina Septian, Miko Shafarina, Shafarina Shafrida Wati, Shafrida Siregar, Ratih Naila Siti Safura Sitti Saleha, Sitti Solly Aryza Sorik, Sutan Sri Mulyani Sri Wahyuni Sri Wahyuningsih Sri Wulan, Icha Sucipto, Krishna W. Suhandi, Anang Suheri, Suheri - Suherman, Suherman Suhud, Khairi sukiakhy, kikye martiwi Surayya Lubis, Fitriani Surbakti, Alpisa Karbina Br Sutra Sutra, Sutra Sutriono Putri, Nur Rachmawati Syafri, Syafri Syafri, Syafri Syafrizal Syafrizal Syafruddin Syafruddin Syamsuddin Syamsuddin Syawaluddin syawal Tasliati Djafar Taufik Hidayat Taufiq Akbar Teuku Zulfadli Ti Aisyah Tjandra, Gallerie Ucy Charisma Umam, Muhammad Isnaini Hadiyul Umar Husein Abdullah Wa Ode Nova Noviyanti Warni, Ade Wibowo, Rulianda Purnomo Winarno, Gunardi Djoko Yani Prihatina Eka Furda Yati, Mimi Yudhi Iqbal, Teuku Yudi Saputra Yuli Santri Isma Yuliani Yuliani Yuridka, Fitrah Zahara, Eva Zahratul Idami Zaimah, Zaimah Zainuddin Zoahira, Wa Ode Aisa Zoahira, Wa Ode Aisah Zulfa, Putri O. Zulfikar Zulfikar Zulfikar, Zeta