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All Journal Sinergi Kinetik: Game Technology, Information System, Computer Network, Computing, Electronics, and Control JCES (Journal of Character Education Society) Jurnal Teknik Mesin Indonesia Mekanika: Majalah Ilmiah Mekanika Indonesian Journal of Electrical Engineering and Computer Science International Journal of Sustainable Transportation Technology SEMAR Journal of Electrical, Electronic, Information, and Communication Technology (JEEICT) Wiga : Jurnal Penelitian Ilmu Ekonomi Automotive Experiences
Ubaidillah
Department Of Mechanical Engineering Universitas Sebelas Maret, Surakarta
Aerospace Engineering Humanities Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Materials Science & Nanotechnology Mechanical Engineering Social Sciences Transportation

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Pembuatan masker aerator untuk atlet difabel sebagai pencegahan hypoxia saat latihan di masa pandemi COVID-19 Faiz Nur Fauzi; Diasdamara Fakhri Nugroho; Rizqi Husain Alfathan; Wijang Wisnu Raharjo; Bambang Kusharjanta; Ubaidillah
Jurnal Teknik Mesin Indonesia Vol. 17 No. 2 (2022): Jurnal Teknik Mesin Indonesia
Publisher : Badan Kerja Sama Teknik Mesin Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36289/jtmi.v17i2.383

Abstract

During the current COVID-19 pandemic, we are encouraged to always obey health protocols. One of them is to use a mask. The use of masks on athletes, especially athletes with disabilities has a bad impact on the athlete's body itself. Because in the course of training, the athletes will do heavy work that requires adequate oxygen supply. In this case, the mask can reduce the athlete's respiratory effectiveness due to hypoxia. Hypoxia is a condition in which the body lacks oxygen levels. To prevent hypoxia in athletes who must continue to carry out training with the COVID-19 health protocol is to use a mask that can regulate air circulation properly. Therefore, an idea emerged to make an aerator mask that can help the respiratory system and can prevent athletes from getting hypoxia during training during a pandemic, because the aerator mask that we made is equipped with dual fans that can supply oxygen properly. Thus, athletes can exercise without fear of experiencing hypoxia disorders and remain compliant with health protocols.
Economic Improvement of Small and Medium Business through the Utilization of Waste Rahmawati Rahmawati; Ubaidillah Ubaidillah; Dwi Prasetyani; Ratna Endah Santoso; Rum Handayani; Siti Nurlela
Wiga : Jurnal Penelitian Ilmu Ekonomi Vol. 12 No. 4 (2022): December 2022
Publisher : Institut Teknologi dan Bisnis Widya Gama Lumajang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30741/wiga.v12i4.912

Abstract

This research aims to downstream/commercialize integrating the management of export-scale wood products with the potential for waste wood chips and sawdust as an impact, so as to increase village potential and create an environmentally friendly village in Manggung village in order to increase village potential. This research was conducted as a leap in the field ofwood product management and processing of waste wood scraps and sawdust into handicrafts and accessories. Improved financial management and marketing of wood production in Manggung village through improving the quality of human resources as well as export-import training to help increase exports of wood products as well as handicrafts and accessories. By utilizing local potential and local wisdom and increasing the role of persons with disabilities and victims of layoffs through training to increase knowledge and skills by cooperating with the support of the Boyolali District Government. Institutional strengthening of BUMDes Maju Makmur in optimizing the management of wood and wood waste through mentoring, training and provision of supporting equipment as well as improving governance capabilities and establishing teaching factories that will be used to study undergraduate students.
Robot Ankle Foot Orthosis with Auto Flexion Mode for Foot Drop Training on Post-Stroke Patient in Indonesia Dimas Adiputra; Ubaidillah; Ully Asfari; Hari Sulistiyo Budi Waspada; Reza Humaidi; Bagas Wahyu Prakoso; Andi Nur Halisyah
Kinetik: Game Technology, Information System, Computer Network, Computing, Electronics, and Control Vol. 7, No. 4, November 2022
Publisher : Universitas Muhammadiyah Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22219/kinetik.v7i4.1533

Abstract

Robot Ankle Foot Orthosis (AFO) has been proven to assist the gait impairment, such as the foot drop. However, development challenge is still remains, such as the trade-off between complexity, functionality and cost. High functionality resulted in high cost, bulky, and complex device. But affordability and simplicity may decrease functionality. Therefore, this research proposed a robot AFO, which has the necessary function of auto dorsi-plantarflexion so it can keep the affordability and simplicity. The robot AFO consists of structure, electronics part and algorithm. The structure is custom made according to the user’s anatomy. A brushless DC (BLDC) motor, Force-Sensing Resistor (FSR) and microcontroller builds the electronic parts. The BLDC motor actuates the flexion, while the FSR detects the gait phase to determine the action. Both are integrated by the microcontroller with the P control algorithm that commands the BLDC motor to generate necessary torque so it rotates in a constant speed. A functionality test has been carried out on the robot AFO, where the robot AFO perform a dorsi-plantarflexion continuously in three conditions, such as no load, 1 Kg load, and foot load. The robot AFO successfully performed a constant velocity rotation in both directions, in all conditions. In the case of 1 Kg load, the maximum angular speed is 0.7 rad/s dorsiflexion and -1.8 rad/s plantarflexion. The torque keeps increasing and decreasing from -0.3 Nm to 4 Nm to keep the angular velocity. The result shows that the robot AFO can perform the necessary function to assist the foot drop training. Functionality test on the gait detection has also been done where it shows that the robot AFO can detect the four gait phases accurately. The robot AFO has been tested and future study should test the robot on a real post-stroke patient to see the effect of the gait control in reality.
Developing adjustable stiffness for smart material of magnetorheological elastomer to diminish vibration Gigih Priyandoko; Purbo Suwandono; Muhammad Ilman Nur Sasongko; Ubaidillah Ubaidillah; Sigit Tri Wicaksono
SINERGI Vol 28, No 1 (2024)
Publisher : Universitas Mercu Buana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22441/sinergi.2024.1.016

Abstract

Many vibration isolators, such as passive vehicle mounting devices, have an inflexible stiffness. This article presents the development of a smart material vibration isolator based on magnetorheological elastomer (MRE), which has adjustable stiffness to minimize unwanted vibrations. The objective of this research is to first create a design for the vibration isolator, and then simulate a magnetic circuit. The Finite Element Method Magnetics (FEMM) software was employed to simulate the effectiveness of the electromagnetic circuit in generating a magnetic field through the vibration isolator by employing MRE samples. Pure iron was chosen as the material for the housing of the vibration isolator test rig. To attain an optimal magnetic field, an inventive design of the magnetic circuit, including examination of the wire type, size, and coil turn number, along with the housing material of the test rig, was performed. The study analyzed the performance of the MRE vibration isolator concerning different current inputs in the coil. The results indicate that the stiffness value of the MRE-based isolator system can be more effectively modified by increasing the current inputs. Therefore, a larger current input leads to a greater change in stiffness.
The Influence of Hard and Soft Magnetic Nanoparticle Additives in Magnetorheological Fluids on the Performance of Magnetorheological Dampers for Motorcycle Rahmad Rizki Nur Arifin; Bhre Wangsa Lenggana; Ubaidillah Ubaidillah; Irfan Bahiuddin; Kacuk Cikal Nugroho; Fitrian Imaduddin; Saiful Amri Mazlan; Arjon Turnip
Automotive Experiences Vol. 9 No. 1 (2026)
Publisher : Universitas Muhammadiyah Magelang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31603/ae.14527

Abstract

Magnetorheological Fluids (MRFs) are widely utilised in semi-active suspension systems due to the ability to dynamically alter their viscosity. The frequently issue in the application of MRFs are sedimentation and aggregation stability. To address this issue, the MRFs have been modified by incorporating hard and soft magnetic nanoparticles. The MRFs investigated were MRF-carbonyl iron powder (CIP), MRF-CIP+cobalt ferrite (CoFe2O4), and MRF-CIP+manganese ferrite (MnFe2O4). The objective of this work is to evaluate the performance of these MRFs to implement the results to motorcycle dampers. To ascertain the MRFs’ magnetic properties and viscosity (η), vibrating sample magnetometer (VSM) and rheometer testing were conducted, respectively. The performance of magnetorheological valve (MRV) was analysed using finite element method magnetics (FEMM) simulations with variations in fluid gaps and types of MRFs. The results indicated that the MRV design with a fluid gap of 0.9 mm, utilizing MRF-CIP+CoFe2O4, exhibited an appropriate combination to fulfil the damping force (Fd) requirements of the motorcycle suspension system. The damping force varied from 0.941 to 3.858 kN, indicating a growth of around 310%. This study demonstrates that the proposed MRV design and the modification of MRFs could enhance the performance of the motorcycle damping system, as evidenced by the experimental and simulation results. The house of quality (HoQ) demonstrates that the proposed magnetorheological damper (MRD) is significantly superior to its competitors in effectively fulfilling customer requirements and expectations.
The Impact of Varying Mixing Rates in a Surfactant-Free Fuel Emulsion Mixer on the Efficiency and Emissions of a Diesel Engine Budi Santoso; Agus Sartomo; Ubaidillah Ubaidillah; Oki Muraza; Elliza Tri Maharani
Automotive Experiences Vol. 7 No. 1 (2024)
Publisher : Universitas Muhammadiyah Magelang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31603/ae.10907

Abstract

The research focuses on water diesel emulsion (WDE), a topic that has captivated researchers for an extended period. While previous studies predominantly employed surfactants to enhance mixing efficiency, their non-economic feasibility in transportation logistics has prompted a shift in recent investigations. This study presents experiments utilizing a cost-effective WDE comprising 15% water and a mixer devoid of surfactants to investigate the impact of mixer blade rotation on engine performance, fuel consumption, and NOx emissions. NOx emission tests were conducted under a constant engine speed of 2,000 rpm and a 75% load (3,23 kW). The optimal brake-specific fuel consumption (BSFC) for the 15% WDE fuel occurred at a blade rotation speed of 3,000 rpm, resulting in a 1% power reduction (from 4,41 kW to 4,38 kW), a 13.3% decrease in BSFC (from 694,98 gr/kW.h to 602,52 gr/kW.h), and a 30% reduction in NOx emissions (from 54 ppm to 38 ppm). This discovery holds promise for future advancements in green energy applications within the transportation sector.
An Examination of the Fe₃O₄ nanomaterial impact in conjunction with Magnetorheological Elastomer material Gigih Priyandoko; Ubaidillah Ubaidillah; Fitrian Imaduddin; Purbo Suwandono; Muhammad Ilman Nur Sasongko
SINERGI Vol. 30 No. 1 (2026)
Publisher : Universitas Mercu Buana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22441/sinergi.2026.1.006

Abstract

Magnetorheological elastomer (MRE) is an advanced material class that can be used for vibration damping. This material possesses the ability to reduce vibration disturbances through adjustment of its mechanical properties in response to a magnetic field applied from an external source. The objective of this study is to ascertain the effect of incorporating Magnetite (Fe₃O₄) nanomaterials into MRE. It is expected that this new material will be more sensitive to magnetic fields in damping vibrations, which would be a significant improvement. MRE is composed of carbonyl iron powder (CIP), silicone oil, and silicone rubber, with weight proportions of 30%, 5%, and 65%, correspondingly. The addition of magnetite nanomaterials to MRE occurred at weight ratios of 0.5%, 1%, 1.5%, and 2%. Observations of this new material included elemental composition analysis and viscoelastic testing of various mixture formulations in the laboratory. From this research, it can be concluded that an MRE containing Fe₃O₄ nanomaterials has been created. For the attenuation of vibrations within the 1–100 Hz frequency range. MRE-2 (MRE with 0.5% Fe₃O₄ added) is the best choice as the primary material, as it exhibited the highest tan delta value and strong damping performance at an intermediate frequency. MRE-1 sample was used as a base material mixture without added Magnetite also an excellent choice, offering high stiffness and good damping capability at low frequencies. It is shown by the results of this experiment that the effectiveness of MRE in reducing vibration can be increased by adding Magnetite, even in the limited mid-frequency range of 0 to 100 Hz.
Design of the Bengawan Unmanned Vehicle (UV) Roboboat: Mandakini Neo Haris Nubli; Fahri Setyo Utomo; Hananta Diatmaja; Aditya Rio Prabowo; Ubaidillah Ubaidillah; Didik Djoko Susilo; Wibowo Wibowo; Teguh Muttaqie; Fajar Budi Laksono
Mekanika: Majalah Ilmiah Mekanika Vol 21, No 2 (2022): MEKANIKA: Majalah Ilmiah Mekanika
Publisher : Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/mekanika.v21i2.61624

Abstract

Mandakini Neo was made with the ship's capacity, speed, and comfort in mind, as well as the ship's hydrodynamic performance and construction cost. Therefore, the method used to determine the hydrostatic characteristics is through a simulation consisting of a resistance test, stability test, maneuver test, and seakeeping test. The simulation uses Maxsurf software with the Savitsky method, which is then processed by data. Global Positioning System (GPS) and ultrasonic sensor tests were also conducted. Based on the simulation results, the stability of the Mandakini Neo ship has a GZ value of 0.1417 m with an angle of 30°, which follows the standards of the International Maritime Organization (IMO). In testing, the maneuvers obtained have met IMO standards based on tactical and advanced diameters. Based on the seakeeping test, when the speed is 5 knots, the heave movement has the same magnitude for all wave headings, 0.0096 m. while the most considerable rolling motion is in the wave direction of 135°, which is 0.36 m, and the most considerable pitch motion is in the direction of the 180° wave, which is 0.042 m. At a speed of 10 knots, the heave motion produced is the same as for all wave headings.
An MR Damper Parametric Model with luz(...) Projection Function and Its Application in an Open-loop Force Tracking Control System Raymundus Lullus Lambang Govinda Hidajat; Fitrian Imaduddin; Budi Santoso; Irianto Irianto; Azma Putra; Ubaidillah Ubaidillah
Mekanika: Majalah Ilmiah Mekanika Vol 23, No 2 (2024): MEKANIKA : Majalah Ilmiah Mekanika
Publisher : Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/mekanika.v23i2.90437

Abstract

This research discusses a parametric model with a luz(...) projection function for an outer bypass Magnetorheological (MR) damper with a meandering type valve and its application in an open-loop force tracking control system. This parametric model with the luz(…) projection function has been developed previously. The MR damper force can be controlled with open-loop force as a standard control strategy. Research on the performance of the MR damper model in open-loop control systems usually uses non-parametric models. Thus, the novelty of this research is that it uses a parametric model, i.e., the model of the luz(...) projection function as the model of the outer bypass MR damper with a meandering type valve. The proposed open-loop control system uses an inverse model that produces an electric current according to the desired force. The force tracking control scheme was realized with computer simulations using a state space approach. These simulation results show that the model with the luz(…) projection function can efficiently and accurately track the desired force in an open-loop force-tracking control system. The desired force is sinusoidal, square, and sawtooth waveform. Relative Error (RE) of 0.000, 0.0123, and 0.0563, respectively, are achieved. 
Wahana Ayun Tangan sebagai Sarana Interaksi Anak dengan Dunia Luar di Taman Mekarsari, Boyolali Budi Kristiawan; Agung Tri Wijayanta; Syamsul Hadi; Indri Yaningsih; Dwi Aries Himawanto; Eko Prasetya Budiana; Ubaidillah Ubaidillah; Zainal Arifin; Noval Fattah Alfaiz; Singgih Dwi Prasetyo
SEMAR (Jurnal Ilmu Pengetahuan, Teknologi, dan Seni bagi Masyarakat) Vol 13, No 2 (2024): November
Publisher : LPPM UNS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/semar.v13i2.79467

Abstract

Taman bermain adalah suatu lingkungan yang didesain secara khusus untuk memberikan kesempatan kepada anak-anak untuk bermain, belajar, dan berinteraksi. Selain berfungsi sebagai tempat hiburan, taman bermain juga memiliki peran penting sebagai ruang pendidikan yang mendukung perkembangan fisik, kognitif, sosial, dan emosional anak-anak. Pengabdian ini memiliki tujuan untuk merancang desain wahana bermain ayun tangan yang mempertimbangkan faktor keselamatan, kenyamanan, dan pengembangan anak di Taman Mekarsari Desa Kaligentong, Kecamatan Gladagsari, Kabupaten Boyolali. Wahana bermain ayun tangan ini didesain dengan menggunakan material yang aman dan tahan lama, serta menerapkan prinsip-prinsip desain yang memungkinkan anak-anak untuk bergerak, bereksplorasi, dan menggunakan imajinasi mereka dengan bebas. Wahana bermain ayun tangan memiliki peran yang penting dalam meningkatkan kualitas hidup anak-anak dengan memberikan mereka kesempatan untuk bermain, belajar, dan tumbuh secara holistik. Dengan adanya wahana ini, anak-anak dapat mengembangkan keterampilan motorik, kognitif, dan sosial mereka sambil menikmati pengalaman bermain yang menyenangkan. Wahana ini diharapkan dapat menciptakan lingkungan yang merangsang interaksi sosial, memperluas keterampilan anak-anak, dan meningkatkan kualitas hidup mereka melalui kesempatan bermain dan belajar. Kata kunci : pengabdian, taman bermain, ayun tangan, edukasi
Co-Authors Abdul Y Abd Fatah Adiputra, Dimas Aditya Rio Prabowo Agung Tri Wijayanta Agus Sartomo Ammar Abdurrohman Andi Nur Halisyah Arifin Nurcholis Arinal Falah Muhammad Arjon Turnip Aziz, Siti Azma Putra Bagas Wahyu Prakoso Bahiuddin, Irfan Bambang Kusharjanta Bhre Wangsa Lenggana Budi Kristiawan Budi Santoso Budi Santoso Cakram Yudhifa Ganda Satriawan Catalina Dara Ayu Az-Zahra Chico Hermanu B.A. Choi, Seung-Bok Damaris Adi Waskitho Danardono Dwi Prija Tjahjana, Dominicus Dewi Utami Diasdamara Fakhri Nugroho Didik Djoko Susilo Dimas Wahyu Utomo Dwi Aries Himawanto Dwi Prasetyani Eko Prasetya Budiana Elliza Tri Maharani Endra Dwi Purnomo Endra Dwi Purnomo Fahri Setyo Utomo Faishal Harish Hidayatullah Faiz Nur Fauzi Fajar Budi Laksono Fitrian Imaduddin Fitrian Imaduddin Fitrian Imaduddin Fitrian Imaduddin Hananta Diatmaja Hapipi, Norhiwani Hari Sulistiyo Budi Waspada Haris Nubli Ilham Bagus Wiranto Indri Yaningsih Indri Yaningsih Irfan Bahiuddin Irianto Irianto Iwan Yahya Kacuk Cikal Nugroho Lenggana, Bhre Masa'id, Aji Mazlan, Saiful Mazlan, Saiful Meiyanto Eko Sulistyo Mohamad, Norzilawati Mohd Afzanizam Mohd Rosli Mohd I Shapiai Mohd N Muhtazaruddin Muhammad Ilman Nur Sasongko Muhammad Ilman Nur Sasongko Muhammad Nizam Muhayat, Nurul Nadiya Nur Aini Nicholas Arga Vino Dewangga Noval Fattah Alfaiz Oki Muraza Priyandoko Gigih Purbo Suwandono Purbo Suwandono Rahmad Rizki Nur Arifin Rahmad Rizki Nur Arifin RAHMAWATI RAHMAWATI Ratna Endah Santoso Raymundus Lullus Lambang Govinda Hidajat Rendy Adhi Rachmanto Reza Humaidi Rizqi Husain Alfathan Rum Handayani Rumi Iqbal Doewes, Rumi Iqbal Saiful A Mazlan Saiful Amri Mazlan Saiful Amri Mazlan Satria Auliansyah Sigit Tri Wicaksono Singgih Dwi Prasetyo Singgih Dwi Prasetyo Siti Nurlela Skolastika Grace Harjaningtyas Suyitno - Suyitno Suyitno Syamsul Hadi Teguh Muttaqie Tri Rahmaji Ully Asfari Virel Wibawa Wibawa Endra Juwana, Wibawa Endra Wibowo Wibowo Wibowo, Wibowo Wijang Wisnu Raharjo Yazid, Izyan Yogie Muhammad Lutfi Zainal Arifin Zainal Arifin Zainal Arifin Zainal Arifin Zeluyvenca Avista