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All Journal Jurnal Teknoin Jurnal Teknik Mesin Indonesia Journal of Mechanical Engineering, Science, and Innovation Prosiding Simposium Nasional Rekayasa Aplikasi Perancangan dan Industri Central Publisher Semantik : Jurnal Riset Ilmu Pendidikan, Bahasa dan Budaya Journal of Social Studies and Education
Muhammad Ridlwan
Departemen Teknik Mesin, Fakultas Teknologi Industri, Universitas Islam Indonesia
Religion Aerospace Engineering Agriculture, Biological Sciences & Forestry Arts Humanities Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Education Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Mechanical Engineering Social Sciences Other

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PROSES PELAPISAN BAJA DENGAN METODE SEMBURAN KAWAT LAS OKSI-ASITILEN Muhammad Ridlwan
Teknoin Vol. 11 No. 3 (2006)
Publisher : Faculty of Industrial Technology Universitas Islam Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20885/.v11i3.90

Abstract

        Wire flame spray process is one of metal coating technique. The flame spray process is basically the spraying of molten metal  onto a surface to provide a coating. Material in wire form is melted in a flame (oxy-acetylene flame most common) and atomized using compressed air to form a fine spray. When the spray contacts the prepared surface of a substrate material, the fine molten droplets rapidly solidify forming a coating.        In this research, commercial steel wire (Fe-C), which has 1.25 mm in diameter, was used as raw material. The wire was heated and melted by two oxy-acetylene nozzles and then sprayed onto steel bar surface to form a coating. Vickers hardness testing and optical microscope were used to define the coating characteristic.        The result shows that the coating has higher hardness number than the substrate material and the intrusion of carbon was founded in the coating microstucture.Keywords: coating process, wire flame spray, oxy-acetylene
PROSES PEMBUATAN SERBUK LOGAM DENGAN METODA ATOMISASI LAS OKSI-ASITILEN Muhammad Ridlwan; Alva Edy Tontowi
Teknoin Vol. 10 No. 4 (2005)
Publisher : Faculty of Industrial Technology Universitas Islam Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20885/.v10i4.104

Abstract

Atomization is the most common method for producing powders from metal. There are three atomization methods in powder fabrication : water atomization, gas atomization, and centrifugal atomization. Atomization was being developed to increase powder quality and process productivity. A new atomization method is possible to find by using another energy resources. Oxy-acetylene can be used as an energy resource in atomization. In this research, powders are made by oxy-acetylene atomization method. Material in wire form is melted in oxy-acetylene flame, which has operating temperature around 3480oC, and atomized to form a fine spray. The fine molten droplets rapidly solidify forming a powders. This research investigate the variation of wire diameter and flame gun attacking angle on atomization process efficiency and production rate. Wire material which used in this research is commercial steel wire with 0.75 mm; 1.25 mm; 1.50 mm in diameter. Flame gun attacking angle is varied 25o, 30o, 35o, 40o, and 45o.Result shows that oxy-acetylene atomization method can be used to produce metal powders. The characteristic of powders which produced by this atomization method have spherical shape, 75 m – 90 m in size, oxidized, and carburized. The efficiency and production rate of the atomization process are around 12.2% and 0.1429 gram/minute. This efficiency and production rate are influenced by wire diameter. Bigger wire diameter results higher efficiency, but lower production rate. For 1.25 mm diameter of commercial wire steel, an optimum efficiency of atomization process, 15.1%, are resulted by 30o of flame gun attacking angle.Keywords : powder fabrication, oxy-acetylene atomization method
Desain, analisis aerodinamika, dan pemodelan mobil mikro berdasarkan antropometri tubuh orang Indonesia Faisal Arif Nurgesang; Muhammad Ridlwan; Yahya Tata Imansyah
Jurnal Teknik Mesin Indonesia Vol 16 No 1 (2021): 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.v16i1.193

Abstract

Mobil mikro adalah mobil dengan dimensi kecil yang hanya bisa diisi oleh satu atau dua orang saja. Mobil mikro dapat menjadi salah satu alternatif kendaraan pilihan masyarakat guna mengurangi kemacetan dan keterbatasan lahan parkir khususnya di kota-kota besar Indonesia. Kajian ini bertujuan untuk mendesain mobil mikro yang memiliki ukuran kompak dan desain yang menarik. Untuk memperoleh desain terbaik, telah dilakukan kuisioner terhadap tiga buah konsep desain yang diawali dari penentuan dimensi berdasarkan antropometri tubuh orang Indonesia. Dari hasil pemilihan desain yang dilakukan, desain konsep model 2 dan model 3 mendapatkan respon yang positif dari responden yaitu sebesar 38,9% dan 55,6%. Dari kedua desain konsep tersebut dilakukan perbandingan analisis untuk mengetahui nilai drag coefficient, lift coefficient, flow trajectory, surface plot, dan cut plot menggunakan perangkat lunak Solidworks flow simulation. Hasilnya, desain konsep model 2 memiliki nilai coefficient of drag dan coefficient of yang lebih kecil dibandingkan dengan desain konsep 3 yaitu sebesar 0.36 dan 0.08. Selain itu, dilihat dari hasil simulasi flow trajectory, surface plot, dan cut plot, desain konsep 2 juga menunjukkan hasil yang lebih baik dari desain konsep 3 mulai dari tekanan maksimum yang terjadi pada bodi mobil, kecepatan aliran di sekitar bodi mobil, dan jenis aliran yang terbentuk di sekitar bodi mobil dimana desain konsep model 2 alirannya didominasi oleh aliran laminar dan merata setelah melewati bodi belakang mobil sedangkan pada desain konsep 3, aliran udara setelah melewati bodi belakang mobil terpisah menjadi dua bagian dan aliran udara yang terbentuk pada belakang bodi mobil cenderung berputar membentuk aliran turbulen. Sehingga dari kedua desain bodi mobil mikro tersebut dapat disimpulkan bahwa bodi mobil 2 lebih stabil jika dikendarai. Berdasarkan hasil tersebut, desain konsep model 2 diwujudkan dalam sebuah model dengan skala 1:6.25 menggunakan 3D printer.
Inovasi Desain dan Simulasi Model Prostesis Bawah Lutut Berdasarkan Antropometri Orang Indonesia Donny Suryawan; Muhammad Ridlwan; Ari Setiadi
Jurnal Teknik Mesin Indonesia Vol 14 No 1 (2019): Jurnal Teknik Mesin Indonesia
Publisher : Badan Kerja Sama Teknik Mesin Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (602.566 KB) | DOI: 10.36289/jtmi.v14i1.112

Abstract

Data kesehatan tahun 2012 menunjukkan bahwa 2,45 % dari jumlah penduduk Indonesia merupakan penyandang disabilitas. Penderita tuna daksa menempati posisi kedua setelah gangguan pada penglihatan. Amputasi bawah lutut adalah salah satu bentuk tuna daksa yang banyak terjadi di Indonesia. Pasien amputasi bawah lutut akan kesulitan berjalan karena ketiadaan organ akibat amputasi. Prostesis bawah lutut merupakan alat pengganti organ bawah lutut. Prostesis bawah lutut akan membantu penderita amputasi bawah lutut agar dapat berdiri dan berjalan. Saat ini, produk prostesis bawah lutut yang ada di Indonesia masih memiliki banyak kekurangan. Pembuatan prostesis masih menggunakan metode custom sehingga membutuhkan proses pembuatan yang lama dan harga yang relatif mahal. Produksi massal tentu dapat menjadi solusi untuk menekan harga dan waktu pembuatan. Desain prostesis bawah lutut yang dapat mengakomodasi rentang antropometri orang Indonesia diperlukan agar prostesis bawah lutut dapat diproduksi secara massal. Hasil pembuatan desain kemudian diuji melalui simulasi sesuai standar ISO 10328 sebelum pembuatan prototipe dan produksi. Prostesis bawah lutut tersebut dirancang untuk mampu menahan beban 100 kg dengan safety factor 4. Selain itu, prostesis bawah lutut yang telah dirancang dapat digunakan untuk penderita yang memiliki rentang tinggi badan antara 150 cm hingga 180 cm.
Mechanical Properties of Sandwich Composite using Glass Fiber Reinforced Polymer as A Skin and 3D Printed Polylactic Acid as A Core Muhammad Ridlwan; Faisal Arif Nurgesang; Rahmat Riza; Nur Muhammad Syafi'i
Journal of Mechanical Engineering, Science, and Innovation Vol 2, No 1 (2022): (April)
Publisher : Mechanical Engineering Department - Institut Teknologi Adhi Tama Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (550.294 KB) | DOI: 10.31284/j.jmesi.2022.v2i1.2935

Abstract

Recently, 3D printing technology has become a practical method to realize products rapidly. It is suitable for making small quantities of products. Although it is capable of printing with a high level of geometric complexity, there is a lack of tensile strength due to its process where the products are printed layer by layer. However, this technology is potentially to be combined in a composite manufacturing process. Mostly, a composite product is made by using a mold. This mold is relatively expensive and can only create a product with less complexity. Nevertheless, the composite product has main advantages such as light, strong, and flexible. Therefore, combining these two technologies is a new breakthrough in realizing products with high complexity, light, strong, and flexible. This study aims to determine the mechanical properties of sandwich composite filled with 3D printed product as a core. Several parameters were varied including core thickness and skin thickness. The skin material was a Glass Fiber Reinforced Polymer (GFRP) while the core material was 3D printed Polylactic Acid (PLA). The tensile and bending tests have been done in accordance with ASTM D638 and ASTM D790. The results showed that the addition of GFRP skin on the sandwich composite could significantly increase the tensile strength but did not have an impact on the flexural strength. The highest flexural strength of 50.36 MPa was achieved at 3 layers of GFRP skin while a remarkable tensile strength of 55.74 MPa was obtained at 4 layers GFRP skin. Moreover, the addition of core thickness also does not have an impact on flexural strength. The flexural strength of the 3D printed core was around 20 MPa for all thickness. However, when 2 layers of GFRP skin were used, a remarkable flexural strength of 57.67 MPa was obtained but the flexural strength was then decreased when using 10 and 15 mm cores.
The Effect Of Printing Speed And Nozzle Temperature On Tensile Strength, Geometry, and Surface Roughness Of A Product Printed using ABS Filament Faisal Arif Nurgesang; Santo Ajie Dhewanto; Muhammad Ridlwan; P Paryanto
Prosiding Simposium Nasional Rekayasa Aplikasi Perancangan dan Industri 2022: Prosiding Simposium Nasional Rekayasa Aplikasi Perancangan dan Industri
Publisher : Universitas Muhammadiyah Surakarta

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

Abstract

3D printing is an additive manufacturing technology that can quickly create 3D models by softening thermoplastic filaments layer by layer. In making objects using 3D printing technology, there are several parameters that affect the strength of the printed objects, including the printing speed and nozzle temperature. This study aims to investigate effect of printing speed and nozzle temperature on tensile strength, geometry, and surface roughness of a product printed using ABS filament. The printing speeds were varied at 30, 40, and 50 mm/s while the nozzle temperature vaeried at 235, 245, and 255 oC. The tensile test was carried out on the printed specimens according to ASTM D-638-02a. The surface roughness and geometry tests were carried out on the printed specimen with dimensions of 30x30x40 mm. The surface roughness and geometry tests were performed on the vertical side in order to examine the layer and the change of height. The results concluded that the optimum printing speed and nozzle temperature based on the research conducted were 30 mm/s and 255 oC where the tensile strength as high as 33.52 MPa was obtained.
PENGARUH KETEBALAN DAN JENIS MATERIAL 3D PRINTED CORE TERHADAP KEKAKUAN BENDING KOMPOSIT SANDWICH SKIN SERAT KARBON Muhammad Ridlwan; Abdi Haritz Pratama
Prosiding Simposium Nasional Rekayasa Aplikasi Perancangan dan Industri 2022: Prosiding Simposium Nasional Rekayasa Aplikasi Perancangan dan Industri
Publisher : Universitas Muhammadiyah Surakarta

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

Abstract

Komposit adalah material yang tersusun dari dua jenis atau lebih material rekayasa yang secara fisik masih dapat dibedakan antar material penyusunnya. Komposit sandwich tersusun dari material bagian tengah sebagai core, serta material komposit pada bagian atas dan bawah sebagai skin. Penelitian ini bertujuan untuk mengetahui pengaruh ketebalan core dan jenis material core terhadap kekakuan bending komposit sandwich yang digabungkan dengan material ABS dan nylon dengan metode vacuum infusion. Material yang digunakan sebagai core dibuat menggunakan Fused Filament Fabrication (FFF) 3D Printing dengan bahan ABS dan nylon dengan infill pattern honeycomb densitas 20%. Hasil pengujian bending menunjukkan bahwa menunjukkan bahwa kekuatan bending pada spesimen yang ditambahkan lapisan komposit sandwich memiliki nilai yang lebih tinggi dari pada spesimen tanpa lapisan komposit. Selain itu, semakin tebal core komposit sandwich nilai kekakuan bendingnya semakin tinggi
Peran Perpustakaan Digital Dalam Pembelajaran Literasi Digital Siswa Sekolah Dasar Muhammad Ridlwan; Almaytasa Munfarikah; Lana Camelya; Muhammad Nofan Zulfahmi
Semantik : Jurnal Riset Ilmu Pendidikan, Bahasa dan Budaya Vol. 3 No. 1 (2025): February : Semantik : Jurnal Riset Ilmu Pendidikan, Bahasa dan Budaya
Publisher : Asosiasi Periset Bahasa Sastra Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61132/semantik.v3i1.1400

Abstract

The rapid development of information and communication technology has changed the way students access information and learn, making digital libraries an important resource for digital literacy learning in primary schools. This research aims to explore the role of digital libraries in enhancing digital literacy learning of primary school students. The methods used included a literature study and a survey of students and teachers in several primary schools. The results showed that digital libraries not only provide easy access to various information sources, but also provide tools and platforms that support the development of students' critical, analytical and creative skills. In addition, the digital library serves as a collaborative space that encourages interaction between students and teachers and between students and other learning resources. The implications of this study highlight the importance of integrating digital libraries into the school curriculum to maximise the learning potential of digital literacy among primary school students. Thus, the utilisation of digital libraries is expected to improve the quality of education and digital literacy skills of students in today's information age.
The Role of Digital Promotion in Increasing Participation in Islamic Boarding School Programs Maskuri Abdul Rohman; Muhammad Sirodjuddin; Muhammad Ridlwan
Journal of Social Studies and Education Vol. 3 No. 1 (2025): January-June
Publisher : Al-Qalam Institute

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61987/jsse.v3i1.662

Abstract

The main focus of this study is to analyze the role of social media, especially Instagram and Facebook, in attracting the attention of parents and participants, as well as the program's effectiveness in creating an emotional attachment that encourages participants to continue their education to regular programs. The research method used is a qualitative approach with in-depth interview techniques involving the head of the pesantren and several program participants. The study results show that the optimal use of social media has increased the number of participants by up to 158 people compared to the previous year. In addition, the holiday cottage program has also proven to be effective in building participant satisfaction, which is reflected in more than 50 participants who expressed their satisfaction and desire to continue the program to a regular level. This program has also successfully introduced pesantren values in a more attractive and relevant way for the younger generation. The implications of these findings show that digital promotion strategies, which combine social media and participant testimonials, can increase the attractiveness of pesantren as a modern educational option but still based on religious values. The study also suggests the importance of integrating religious learning and developing social and leadership skills to respond to the demands of modern education.
PENGGUNAAN GAME EDUKASI “TEBAK BANGUN DATAR” BERBASIS WORDWALL UNTUK MENINGKATKAN MOTIVASI BELAJAR MATERI BANGUN DATAR PADA SISWA KELAS 4 SD AL ISLAM PENGKOL JEPARA Muhammad Ridlwan; Putri Suci; Syailin Nichla Choirin Attalina
Journal Central Publisher Vol 2 No 9 (2024): Jurnal Central
Publisher : Central Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.60145/jcp.v2i9.524

Abstract

Latar Belakang : Materi bangun datar dalam matematika membantu siswa mengaitkan pelajaran dengan kehidupan sehari-hari. Namun, pembelajaran masih menghadapi tantangan. Oleh karena itu, diperlukan inovasi pembelajaran yang menarik agar siswa lebih termotivasi dan memahami materi dengan lebih baik. Tujuan : Penelitian tindakan kelas (PTK) ini bertujuan menguji efektivitas game edukasi "Tebak Bangun Datar" berbasis Wordwall dalam meningkatkan motivasi belajar matematika materi bangun datar pada siswa kelas 4 SD Al Islam Pengkol Jepara. Metode : Penelitian menggunakan model Kurt Lewin dalam dua siklus (perencanaan, tindakan, observasi, refleksi). Data dikumpulkan melalui angket, observasi, dan tes, lalu dianalisis secara kuantitatif (uji t-berpasangan) dan kualitatif. Hasil dan Pembahasan : Hasil penelitian menunjukkan peningkatan signifikan motivasi belajar, dengan skor rata-rata naik dari 13 (pra-siklus) menjadi 15 (siklus 1) dan 14,3 (siklus 2). Analisis statistik membuktikan signifikansi peningkatan tersebut (nilai-p < 0,05). Data kualitatif mengungkap peningkatan keterlibatan siswa, partisipasi aktif, dan suasana kelas yang lebih dinamis. Studi ini menekankan sinergi antara teknologi (Wordwall) dan pendekatan humanis (kolaborasi kelompok, pendampingan personal) dalam membangun motivasi. Kesimpulan : Temuan ini membuktikan bahwa pembelajaran berbasis game interaktif dapat mengubah pendidikan matematika konvensional menjadi pengalaman yang menarik dan efektif. Penelitian berkontribusi pada pengembangan strategi pembelajaran inovatif, dengan merekomendasikan integrasi Wordwall dalam kurikulum SD untuk mendukung pembelajaran berpusat pada siswa.
Co-Authors Abdi Haritz Pratama Almaytasa Munfarikah Alva Edy Tontowi Ari Setiadi Donny Suryawan Faisal Arif Nurgesang Lana Camelya Maskuri Abdul Rohman Muhammad Nofan Zulfahmi Muhammad Sirodjuddin Nur Muhammad Syafi&#039;i P Paryanto Putri Suci Rahmat Riza Santo Ajie Dhewanto Syailin Nichla Choirin Attalina Yahya Tata Imansyah