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All Journal Journal of Architecture & Environment JMM (Jurnal Masyarakat Mandiri) Mekanika: Majalah Ilmiah Mekanika Automotive Experiences
Rendy Adhi Rachmanto
Department Of Mechanical Engineering, Universitas Sebelas Maret, Surakarta
Aerospace Engineering Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Control & Systems Engineering Electrical & Electronics Engineering Energy Environmental Science Materials Science & Nanotechnology Mechanical Engineering Other

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Aerodynamic Characteristics of Ahmed Body with Inverted Airfoil Eppler 423 and Gurney Flap on Fastback Car Zainal Arifin; Suyitno Suyitno; Dominicus Danardono Dwi Prija Tjahjana; Wibawa Endra Juwana; Rendy Adhi Rachmanto; Chico Hermanu Brillianto; Ubaidillah Ubaidillah; Singgih Dwi Prasetyo; Arinal Falah Muhammad; Mohd Afzanizam Mohd Rosli
Automotive Experiences Vol. 5 No. 3 (2022)
Publisher : Universitas Muhammadiyah Magelang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31603/ae.7067

Abstract

The installation of aerodynamic devices, such as rear wings with the application of a Gurney flap, is very important to improve the performance of vehicles and can generate downforce and reduce slip when a car turns and brakes. The goal of this study was to determine the aerodynamic characteristics of the addition of a rear wing using an Eppler 423 airfoil, which was applied with a Gurney flap featuring variations in the angle of attack and the height of the Gurney flap. The rear wing was mounted on the Ahmed body with a rear slant angle of 15°, which is similar to the configuration on a fastback type car. This research was conducted by 3D modeling through computational fluid dynamics (CFD) simulation using ANSYS Student R18.2 by using ahmed body design. There are three variations in the angle of attack for the rear wing (0°, 7.5°, and 15°), as well as five variations in Gurney flap height of 0%, 0.5%, 1%, 1.5%, and 2% for the chord-line length. In this study, the best variation was found at an angle of attack of 15⁰ with a height of 2% C. From this configuration improved CL/CD ratio by 25.36% when compared to the results without a Gurney flap.
WAHANA PAPAN SELUNCUR SEBAGAI SARANA INTERAKSI ANAK DENGAN DUNIA LUAR Zainal Arifin; Rendy Adhi Rachmanto; Suyitno Suyitno; Dominicus Danardono Dwi Prija Tjahjana; Wibawa Endra Juwana; Yudin Joko Prasojo; Singgih Dwi Prasetyo
JMM (Jurnal Masyarakat Mandiri) Vol 7, No 5 (2023): Oktober
Publisher : Universitas Muhammadiyah Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31764/jmm.v7i5.17476

Abstract

Abstrak: Taman bermain merupakan lingkungan yang dirancang khusus untuk menyediakan kesempatan bermain, belajar, dan berinteraksi bagi anak-anak. Taman bermain tidak hanya merupakan tempat hiburan semata, tetapi juga berperan sebagai ruang pendidikan yang mendukung perkembangan fisik, kognitif, sosial, dan emosional anak-anak. Pengabdian ini bertujuan untuk merancang desain wahana bermain papan seluncur yang dirancang dengan mempertimbangkan faktor keselamatan, kenyamanan, dan pengembangan anak di Taman Mekarsari Desa Kaligentong, Kecamatan Gladagsari, Kabupaten Boyolali. Papan seluncur merupakan sebuah wahana dengan bentuk seperti seluncuran yang difungsikan sebagai sarana anak-anak untuk berinteraksi pada lingkungan luar. Metode yang digunakan pada pengabdian ini berupa deskriptif kualitatif yang dilakukan melalui tahapan wawancara dan observasi. Pengabdian ini merupakan kolaborasi antara dosen dan mahasiswa Program Studi Teknik Mesin, Universitas Sebelas Maret, Surakarta dengan Kelompok Tani (PokTan) Desa Kaligentong, Gladagsari, Boyolali sebagai pengelola Taman Mekarsari. Evaluasi yang dilakukan untuk wahana bermain ini yaitu dengan melakukan simulasi percobaan papan seluncur secara langsung. Dari kolaborasi ini didapatkan hasil berupa desain papan seluncur yang kokoh dan dibuatnya wahana bermain papan seluncur yang aman dan nyaman di Taman Mekarsari. Diharapkan dengan adanya wahana bermain ini dapat mendorong interaksi sosial dan pengembangan keterampilan anak-anak sehingga dapat meningkatkan kualitas hidup dengan memberikan kesempatan bermain dan belajar secara menyeluruh.Abstract:  Playgrounds are environments specifically designed to provide opportunities for children to play, learn and interact. Playgrounds are not only places of entertainment, but also act as educational spaces that support children's physical, cognitive, social, and emotional development. This service aims to design a skateboard playground that is designed by considering safety, comfort, and child development factors at Mekarsari Park, Kaligentong Village, Gladagsari District, Boyolali Regency. Papan seluncur is a vehicle with a shape like a slide that functions as a means for children to interact with the outside environment. The method used in this service is descriptive qualitative which is carried out through interviews and observations. This service is a collaboration between lecturers and students of the Mechanical Engineering, Universitas Sebelas Maret, Surakarta with the Farmer Group (PokTan) of Kaligentong Village, Gladagsari, Boyolali as the manager of Mekarsari Park. The evaluation carried out for this playground is by simulating the papan seluncur experiment directly. From this collaboration, the results were obtained in the form of a sturdy papan seluncur design and the creation of a safe and comfortable papan seluncur playground in Mekarsari Park. It is hoped that this playground can encourage social interaction and skill development of children to improve the quality of life by providing comprehensive play and learning opportunities.  
EXPLORING ARCHITECTURAL ATTRIBUTES OF JAVANESE DWELLINGS: A CASE STUDY OF MR. MARYANTO’S CENTURY-OLD HOUSE Setyadji, Kesit Himawan; Muqoffa, Mohamad; Marlina, Avi; Wulansari, Ayu Edhi Sri; Rachmanto, Rendy Adhi; Suyitno, Suyitno; Caroko, Novi; Yusuf, Mirza; Basuki, Basuki
Journal of Architecture&ENVIRONMENT Vol 23, No 1 (2024)
Publisher : Department of Architecture, Institut Teknologi Sepuluh Nopember (ITS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j2355262x.v23i1.a22100

Abstract

This paper examines the architectural characteristics of Javanese houses and investigates the factors that influence their development and evolution. The study focuses on Mr. Maryanto’s house, a third-generation inhabitant of the house, which is estimated to be more than a century old. The research delves into the historical transformations of the house's structure and materials, particularly the “usuk” and “reng” replacements. Additionally, it explores the presence of unique ornamental features, such as the “naga” motifs on the “dhadha peksi”, which is unusual for rural houses. The paper analyzes the spatial layout and function of the rooms within the house, revealing the significance of factors like cultural traditions, economic conditions, and environmental adaptations in shaping Javanese house architecture.
Exploring Architectural Attributes of Javanese Dwellings: A Case Study of Mr. Maryanto’s Century-Old House Kesit Himawan Setyadji; Mohamad Muqoffa; Avi Marlina; Ayu Edhi Sri Wulansari; Rendy Adhi Rachmanto; Suyitno; Novi Caroko; Mirza Yusuf; Basuki
Journal of Architecture & Environment Vol. 23 No. 1 (2024)
Publisher : Center for Scientific Publication

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j2355262x.v23i1.a22100

Abstract

This paper examines the architectural characteristics of Javanese houses and investigates the factors that influence their development and evolution. The study focuses on Mr. Maryanto’s house, a third-generation inhabitant of the house, which is estimated to be more than a century old. The research delves into the historical transformations of the house's structure and materials, particularly the “usuk” and “reng” replacements. Additionally, it explores the presence of unique ornamental features, such as the “naga” motifs on the “dhadha peksi”, which is unusual for rural houses. The paper analyzes the spatial layout and function of the rooms within the house, revealing the significance of factors like cultural traditions, economic conditions, and environmental adaptations in shaping Javanese house architecture.
Experimental Test of Ignition Timing with Programable CDI on Performance Single Cylinder Otto Engine Rendy Adhi Rachmanto; Martinus Darmawan Bagas Wijayanto; Wibawa Endra Juwana; Pramodkumar Siddappa Kataraki
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.v21i2.58951

Abstract

Ignition timing is sparking from the spark plug based on the ignition angle during the compression stroke in the combustion chamber relative to the piston position and the crankshaft angular speed. Adjusting the ignition angle is one method to optimize the combustion process in the engine. An optimal combustion process can improve engine performance and reduce fuel consumption. This study investigates optimal data from ignition angle changes using a programmable Capacitive Discharge Ignition (CDI). The test was performed on a single-cylinder four-stroke Otto engine with standard ignition angle variations, +3°, +6°, and +9° before Top Dead Centre (TDC). The test results show that torque and power have increased while brake-specific fuel consumption has decreased. Optimal data acquisition at ignition angle of +9° with peak torque value of 6.91 Nm and peak power value of 4.80 kW, while the lowest value of specific fuel consumption is 0.234 kg/kWh, and the highest value of thermal efficiency is 36%. From this study, it was concluded that the ignition timing could affect the engine performance.
Experimental Study Influences Changes In Compression Ratio To Performance Of Single Cylinder Otto Engine Wibawa Endra Juwana; Rendy Adhi Rachmanto; Mugi Wiyono; Iwan Istanto
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.v21i2.59487

Abstract

Increasing the compression ratio is an attempt to increase the efficiency and performance of the engine. The purpose of the study was to analyze the effect of changes in the compression ratio on engine performance. Tests using a single-cylinder Otto engine by comparing the performance of an enlarged compression ratio of 9.7:1 and 10.4:1 with a standard compression ratio of 9.0:1. The result of the research is that the compression ratio of 9.7:1 produces a peak torque of 7.51 Nm at 6000 rpm, a peak power of 5.30 kW at 8000 rpm, and the lowest Brake-Specific Fuel Consumption (BSFC) is 0.146 kg/kWh at 6000 rpm. Torque and power increased by 0.09 Nm and 0.28 kW, and Brake-Specific Fuel Consumption (BSFC) decreased by 0.018 kg/kWh compared to the standard compression ratio of 9.0:1. Using a compression ratio of 10.4:1 produces a peak torque of 7.69 Nm at 6000 rpm, a peak power of 5.38 kW at 8000 rpm, and the lowest Brake-Specific Fuel Consumption (BSFC) is 0.116 kg/kWh at 6000 rpm. Torque and power increased by 0.27 Nm and 0.36 kW, and Brake-Specific Fuel Consumption (BSFC) decreased by 0.030 kg/kWh compared to the standard compression ratio of 9.0:1.
Co-Authors Arinal Falah Muhammad Ayu Edhi Sri Wulansari Basuki Basuki, Basuki Caroko, Novi Chico Hermanu B.A. Danardono Dwi Prija Tjahjana, Dominicus Iwan Istanto Kesit Himawan Setyadji Marlina, Avi Marlina, Avi Martinus Darmawan Bagas Wijayanto Mirza Yusuf Mohamad Muqoffa Mohd Afzanizam Mohd Rosli Mugi Wiyono Novi Caroko Pramodkumar Siddappa Kataraki Rahmad Rizki Nur Arifin Rumi Iqbal Doewes, Rumi Iqbal Satria Auliansyah Setyadji, Kesit Himawan Singgih Dwi Prasetyo Suyitno Suyitno - Suyitno Suyitno Suyitno Suyitno Suyitno Suyitno Suyitno, Suyitno Trismawati Trismawati Ubaidillah Wibawa Endra Juwana, Wibawa Endra Wulansari, Ayu Edhi Sri Yudin Joko Prasojo Yusuf, Mirza Zainal Arifin Zainal Arifin