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All Journal Jurnal Dedikasi SINTEK JURNAL: Jurnal Ilmiah Teknik Mesin Rekayasa Mesin R.E.M (Rekyasa Energi Manufaktur) Jurnal Turbo : Jurnal Program Studi Teknik Mesin Academia Open Seminar Nasional Hasil Riset dan Pengabdian (SNHRP) Indonesian Journal of Innovation Studies PELS (Procedia of Engineering and Life Science) Procedia of Social Sciences and Humanities eProceedings of Management Journal of Aerospace Systems and Engineering Innovations
Rachmat Firdaus
Universitas Muhammadiyah Sidoarjo
Aerospace Engineering Agriculture, Biological Sciences & Forestry Arts Humanities Automotive Engineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Economics, Econometrics & Finance Education Electrical & Electronics Engineering Engineering Environmental Science Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Library & Information Science Materials Science & Nanotechnology Mechanical Engineering Medicine & Pharmacology Physics Public Health Social Sciences Other

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Socialization of Waste Sorting and Utilization: Sosialisasi Pemilahan dan Pemanfaatan Sampah Shodiq, Ja’far; Akbar, Ali; Firdaus, Rachmat; Huesein, Wa Ode Asma’ul Husna
Procedia of Social Sciences and Humanities Vol. 3 (2022): Proceedings of the 1st SENARA 2022
Publisher : Universitas Muhammadiyah Sidoarjo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21070/pssh.v3i.239

Abstract

Dissemination of waste sorting and utilization activities was carried out to residents of Dayurejo Village, precisely Gamoh Hamlet, Prigen District, Pasuruan Regency from January to March 2022. The purpose of this activity is to increase knowledge and skills regarding the sorting and utilization of household waste as a more useful product. The method of activity carried out is by conducting socialization counseling and providing examples of the use of plastic waste into hanging gardens. From this activity, it can be seen that the enthusiasm of the participants to acquire skills and abilities regarding the use of household waste. Likewise, the youths were very enthusiastic in participating in the socialization and counseling activities on household waste management. The stimulus to utilize the existing waste was responded well by the participants, thus giving hope for efforts to improve the quality of waste processing and reduce the negative impact of household waste and can produce more beneficial outcomes from household waste that is produced every day.
Prototype Energy Saving Car Chassis Design and Analysis Using 6061 Aluminum Material : Perancangan Desain dan Analisa Chassis Mobil Hemat Energi Tipe Prototype dengan Material Aluminium 6061 Pangestu, Eka Adji; Fahruddin, A'rasy; Akbar, Ali; Firdaus, Rachmat; Iswanto; Nia Nuraeni Suryaman
R.E.M. (Rekayasa Energi Manufaktur) Jurnal Vol 9 No 2 (2024): December
Publisher : Universitas Muhammadiyah Sidoarjo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21070/r.e.m.v9i2.1706

Abstract

The chassis is an important component car which functions to support the load on the vehicle and has a strong construction. The chassis, as the main support for all vehicle componentsy. Increased fuel use and rising global crude oil prices have encouraged research into energy saving cars with special designs that can reduce fuel consumption and pollutant emissions. The design process with variations in rollbar shape and variations in cross sectional shape with 6061 aluminum material using Autodesk Inventor 2024 software. After the design process is complete, stress analysis test stage is carried out to obtain analysis data, namely von misses stress, strain, displacement, safety factor. The results of the chassis design using concept B with a pipe cross-sectional shape and rollbar fillet model are more recommended, because it has better von Mises stress value and a better safety factor, besides that the concept B chassis design is easier in the assembly process with prototype type energy efficient car body.
Pengaruh Kepemilikan Publik, Leverage, dan Ukuran Perusahaan Terhadap Pengungkapan Manajemen Risiko (Studi Kasus pada Perusahaan Sektor Basic Materials yang Terdaftar di Indeks Saham Syariah Indonesia (ISSI) Tahun 2022) Firdaus, Rachmat; Isynuwardhana, Deannes; Nurbaiti, Annisa
eProceedings of Management Vol. 11 No. 6 (2024): Desember 2024
Publisher : eProceedings of Management

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Pengungkapan manajemen risiko merupakan suatu informasi mengenai pengelolaan risiko perusahaan danmenyampaikan dampak perusahaan yang akan mendatang. Maka adanya pengungkapan manajemen risiko untukmembantu perusahaan memberikan informasi terhadap pihak eksternal pada perusahaan mengenai risiko perusahaan.Penelitian ini menggunakan metode kuantitatif jenis data sekunder dengan menggunakan IBM SPSS 26 untukmelakukan pengujian hipotesis penelitian. Sampel yang digunakan pada penelitian ini sebanyak 64 data perusahaandari 68 perusahaan dengan menggunaka purposive sampling pada Perusahaan sektor basic materials yang terdaftar diindeks saham syariah indonesia (ISSI) tahun 2022. Penelitian ini menggunakan analisis statistic deskriptif dan regresilinier berganda. Penelitian ini juga ingin mengetahui pengaruh kepemilikan publik, leverage, ukuran perusahaanterhadap pengungkapan manajemen risiko pada sektor basic materials yang terdaftar di indeks saham syariahindonesia (ISSI) tahun 2022. Hasil penelitian ini menunjukkan bahwa kepemilikan publik, leverage, ukuranperusahaan berpengaruh terhadap pengungkapan manajemen risiko. Selain itu secara parsial leverage tidakberpengaruh terhadap pengungkapan manajemen risiko, sedangkan kepemilikan publik, ukuran perusahaan secaraparsial berpengaruh terhadap pengungkapan manajemen risiko. Bedasarkan hasil penelitian ini dari ketiga variabeltersebut dapat digunakan secara bersamaan, kepemilikan publik, leverage,ukuran perusahaan memiliki pengaruh yangsignifikan terhadap pengungkapan manajemen risiko perusahaan. Penelitian ini tidak mencakup semua variabel karenamungkin ada variabel lain yang dapat mempengaruhi variabel penelitian. Kata Kunci-pengungkapan manajemen risiko, kepemilikan publik, leverage, ukuran perusahaan
STUDY OF UNDERWATER FRICTION STIR WELDING PROCESS PARAMETERS ON AA6005-T6 MATERIAL FOR MARINE INDUSTRY AND UNDERWATER STRUCTURE APPLICATIONS Mulyadi, Mulyadi; Fahruddin, A'rasy; Firdaus, Rachmat; Ahfas, Akhmad
Jurnal Rekayasa Mesin Vol. 16 No. 2 (2025)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v16i2.1922

Abstract

This research explores Underwater Friction Stir Welding (UFSW) on AA6005-T6 material, focusing on identifying optimal process parameters to enhance joint quality in terms of macrostructure, tensile strength, impact strength, and hardness. The results from UFSW welding of AA6005-T6 indicate that optimal process parameters yield better joint quality. The macrostructure of specimens with optimal parameters, such as spc 7, demonstrates improved homogeneity and minimal defects. The highest tensile strength and impact strength were achieved in this specimen, with a tensile strength of 117.7 MPa and an impact strength of 0.944 joule/mm², compared to other specimens. Meanwhile, the hardness of the welded joints, which is lower than the base metal, reflects the influence of process parameters on the microstructure of the joints. Overall, these results underscore the importance of precise parameter control to achieve high-quality welds. This research provides valuable insights into the effectiveness of process parameters in producing high-quality joints in underwater welding environments and highlights the potential of UFSW as an innovative method for underwater welding.
The Effect of Using Bio-Solar Fuel with Additives, Solar Dexlite and Pertamina Dex on Mitsubishi L300 Diesel in 2007 on Vehicle Smoke Density: Pengaruh Penggunaan Bahan Bakar Bio Solar Dengan Zat Aditif, Solar Dexlite dan Pertamina Dex pada Mitsubishi L300 Diesel Tahun 2007 Terhadap Kepekatan Asap Kendaraan Iqlima, Anita Rahma Nur; Firdaus, Rachmat
Indonesian Journal of Innovation Studies Vol. 14 (2021): April
Publisher : Universitas Muhammadiyah Sidoarjo

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (214.096 KB) | DOI: 10.21070/ijins.v14i.537

Abstract

Diesel engined vehicles are one of the biggest causes of air pollution. Exhaust emissions will continue to increase along with the growth in the number of motorized vehicles, especially for commercial vehicles. The main purpose of this study is to determine the quality of fuel can affect the level of smoke density in diesel engines. This research was conducted by testing sampling on a motor vehicle that is commonly used by the public, namely the Mitsubishi L300 in 2007 production using a Smoke Tester. The test mechanism utilizes different fuel variables, namely: Bio Solar with Additive Substances, Solar Dexlite and Pertamina Dex. From the test results, the highest smoke density value was achieved on Bio Solar fuel with additives at 4200 rpm engine speed with a value of 34.1%. Keywords: Vehicles, Diesel Engines, Smoke Density, Fuel Quality, Additives
Maximizing Motorcycle Power and Torque with Roller Modifications: Memaksimalkan Tenaga dan Torsi Sepeda Motor dengan Modifikasi Roller Efendi, Muchammad; Firdaus, Rachmat
Indonesian Journal of Innovation Studies Vol. 25 No. 3 (2024): July
Publisher : Universitas Muhammadiyah Sidoarjo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21070/ijins.v25i3.1159

Abstract

In the automotive world, rapid advancements in motorized vehicle technology necessitate consumers to be selective in vehicle choice. This study examines the performance of motorcycles using modified racing rollers versus standard factory rollers. Focusing on a 150cc matic motorcycle, we analyzed power and torque outputs using rollers of different masses (11g, 16g, and standard 15.5g). Field studies and literature reviews were conducted, employing tools like dynotests to measure performance at RPM ranges from 4,700 to 9,500. Results indicate that the 16g roller achieved the highest torque of 12.45 N/m at 6,800 RPM, while the 11g roller attained 12.09 N/m at 67,300 RPM. The standard 15.5g roller reached 12.07 N/m at 76,400 RPM. This research highlights the impact of roller mass on motorcycle performance, providing valuable insights for enhancing vehicle efficiency and consumer choice. Highlight: 16g roller achieves highest torque of 12.45 N/m at 6,800 RPM. 11g roller reaches torque of 12.09 N/m at 67,300 RPM. Standard 15.5g roller attains 12.07 N/m at 76,400 RPM. Keywoard: Motorcycle Performance, Racing Rollers, Torque, Power Output, 150cc Matic
Transforming Indonesian Washing Machines into Efficient Wind Generators: Mengubah Mesin Cuci Indonesia Menjadi Pembangkit Listrik Tenaga Angin yang Efisien Putra , Ahmad Nurwanda Bawono; Firdaus, Rachmat
Indonesian Journal of Innovation Studies Vol. 25 No. 3 (2024): July
Publisher : Universitas Muhammadiyah Sidoarjo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21070/ijins.v25i3.1166

Abstract

People's consumption of household electronic devices is increasing, leading to higher energy demand in Indonesia, with washing machines being a significant contributor. This study explores repurposing used washing machine dynamos into electricity generators for windmills. Researchers used an LG washing machine dynamo and N52 neo super magnets, testing pulley diameters of 12 cm, 15 cm, 18 cm, and 20 cm. Results showed that larger pulleys increased generator output, with a 20 cm pulley producing 26 volts, 1.3 amperes, and 2525 rpm. However, the efficiency was low at 8.69%, indicating a need for further optimization. This approach has potential for sustainable energy solutions and reducing electronic waste. Highlight: Repurpose Dynamos: Converts washing machines to windmill generators, reducing electronic waste. Efficiency Challenge: Larger pulleys improve output but efficiency is only 8.69%. Sustainable Impact: Offers potential for sustainable energy and lower household consumption. Keyword: household electronics, energy consumption, washing machine dynamo, windmill generator, sustainable energy
Analisis Sambungan Proses Underwater Friction Stir Welding Pada Alumunium Seri 6005-T6 Terhadap Kuat Impact dan Struktur Micro Prasetya, Fikri; Mulyadi; Firdaus, Rachmat
Journal of Aerospace Systems and Engineering Innovations Vol. 1 No. 1 (2025): October
Publisher : Indonesian Journal Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47134/jasei.v1i1.4948

Abstract

Underwater Friction Stir Welding (UFSW) is a solid state welding process that is able to unite materials with water that are relatively difficult to weld using fusion welding. Additionally, this process is very energy efficient and friendly compared to fusion welding. While there are several advantages of UFSW over fusion welding, the thermal cycling involved in UFSW can cause softening of the joint, especially in Heat Treatable Aluminum Alloys (HTTA), in this case the material AA6005-T6. This is caused by the dissolution or acidification of reinforcing deposits during the welding process, which ultimately results in a decrease in the mechanical properties of the joint. UFSW can be the process of choice to overcome these limitations. This process is suitable for alloys that are sensitive to heating during welding and is widely used for HTTA. The aim of this article is to provide a comprehensive literature review regarding the current status and development of UFSW and its importance compared to WPS with the aim of discussing and summarizing various aspects of UFSW. Special attention is paid to basic principles including material flow, generation temperature, process parameters, microstructure and mechanical properties. The research results showed that the highest impact value in specimen 2 was 0.944 Joules/mm2 compared to the base metal with an impact value of 0.641 Joules/mm². Micro tests on fine grains in the weld nugget (WN) area clearly show differences with a denser structure compared to the thermo-mechanically affected zone (TMAZ) which is the tool edge area or what is usually called plastic deformation in the UFSW process, which can cause zones the weld becomes stronger than in the base metal (BM) area.
Co-Authors Ahmad Ahfas Ajitiyo Dananjoyo Alfiansyah Satrio Wicaksono Ali Akbar Ali Akbar Annisa Nurbaiti Deannes Isynuwardhana Edi Widodo Efendi, Muchammad Eriq Helmy Aziz Fahruddin, A'rasy Ferdiansyah, Faris Fernanda, Ardhi Shefta Hamzah Setiawan Huesein, Wa Ode Asma’ul Husna Iqlima, Anita Rahma Nur iswanto Iswanto Iswanto Mochammad Nur Rizki Mohammad Afif Fajar Mohammad Dani Iswanto MULYADI Mulyadi Mulyadi Mulyadi Mulyadi Nia Nuraeni Suryaman Nur Afif Rozikin Pangestu, Eka Adji Paramitha Amelia Kusumawardani Perbawa, Dafva Ari Prantasi Harmi Tjahjanti Prasetya, Fikri Putra , Ahmad Nurwanda Bawono Rachmadani, Dhaniar Gumelang Rahmania Sri Untari Ribangun Bamban Jakaria Sari, Ghulam Muhammad Abdu Shodiq, Ja’far Siti Cholifah Waluyo, Satrio Yulianto, Achmad Irfan