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Yoddy Agung Nuhgraha
Politeknik TEDC
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STUDI EXPLOSION WELDING Yoddy A. Nuhgraha
Jurnal TEDC Vol 10 No 1 (2016): Jurnal TEDC
Publisher : UPPM Politeknik TEDC Bandung

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

Abstract

Para perancang biasanya menghadapi dilema dalam pemilihan material, dimana material yang terbaik untuksuatu elemen khusus dalam perancangan ternyata masih ada kekurangan dalam sifat-sifatnya yangdibutuhkan oleh elemen lain. Contohnya, suatu material mempunyai ketahanan korosi dan konduktifitas termalyang baik, tetapi kurang dalam kekuatan, kekerasan, mampu las, atau ketahanan aus yang dibutuhkan dalamperancangan. Suatu cara yang dapat menghilangkan dilema ini didapat dengan menggunakan materialexplosion welding. Material yang dibentuk melalui explosion welding memungkinkan perancang dapatmenempatkan material secara spesifik dalam rancangannya, tanpa mengurangi sifat-sifat penting lainnya.Material explosion welding dapat menghasilkan kekuatan, kehandalan, dan efektivitas biaya yang baiksepanjang umur pakai material tersebut. Artikel ini adalah terjemahan bebas dari artikel David Cutter yangdimuat dalam Welding Jurnal Juli 2006 halaman 38 – 43 dengan judul What You Can Do with ExplosionWelding.Kata kunci : explosion welding, sifat-sifat material, perancangan, pemilihan material.
Rancang Bangun Mesin Pengupas Buah Pohon Aren (Kolang-Kaling) Rizki Ramdani; Agus Saleh; Yoddy Agung Nuhgraha; Muhammad Abdul Rofik
Jurnal Ilmiah Wahana Pendidikan Vol 9 No 1 (2023): Jurnal Ilmiah Wahana Pendidikan
Publisher : Peneliti.net

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (226.908 KB) | DOI: 10.5281/zenodo.7545980

Abstract

This research is entitled "Design of the Peeler Palm Fruit on The Machine Making Sugar Palm Fruit ". Young palm fruit that is used as an ingredient to produce palm fruit has a hard skin and seeds that are very tightly attached to the fruit strands, so it takes several processes and a long time to process palm fruit into fruit palm fruit. The production of kolang-kaling is very low due to the application of post-harvest technology for palm fruit that is not optimal, therefore the technology for breaking palm fruit is applied in a way that is easy and safe to use. The design of the peeler on the sugar palm fruit making machine aims to help the community of kolang-kaling entrepreneurs in the process of processing sugar palm fruit which is still simple and takes a long time. The method used in this study uses an experimental method with a combination of qualitative and quantitative approaches while the data analysis technique used uses quantitative techniques. The design of the peeler on this sugar palm fruit machine uses the methods of analysis, design, assembly, and testing of the peeler. This research was conducted from November 2020 to June 2021 in Pasir Munjul Village, Sukatani District, Purwakarta Regency and in the Mechanical Engineering Practice Room TEDC Polytechnic Bandung. The parameters observed were the effective capacity of the tool (kg/hour). The results of the design obtained are a palm fruit crusher with dimensions of 600 mm x 1200 mm x 1000 mm which is integrated with the flattening tool and uses a 3600 rpm combustion motor power with a power of 5.5 HP with the principle of stripping using seven blades that rotate on its axis and the palm fruit rests on the runway gap. The results showed that the effective capacity of the tool was 918 kg/hour with stripping results of 139.5 kg/hour.
REDUKSI RUGI-RUGI PENSAKLARAN PADA KONVERTER DC-DC ZETA DENGAN TEKNIK ZERO VOLTAGE TRANSITION Anung -; Givy Devira Ramady; Muchamad Sobri Sungkar; Yoddy Agung Nuhgraha; Agung Wirjawan
Power Elektronik : Jurnal Orang Elektro Vol 12, No 1 (2023): POWER ELEKTRONIK
Publisher : Politeknik Harapan Bersama Tegal

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30591/polektro.v12i1.4378

Abstract

This paper presents a dc-dc ZETA converter with reduced switching loses at the main switch. Reducing switching loses is obtained by application of a resonance switch, where turn-on by the zero voltage and rising voltage at turn-off is limited by capacitor that it’s placed parallel with main switch. The operational principle of the proposed dc-dc ZETA converter with reduced switching loses has been analyzed under different modes of switching operation. To validate the proposed converter, the implementation is carried out using PSIM software. Simulation result shows that the main switch turn-on at the zero voltage and turn-off at the main switch voltage increase in a quadratic function, so that the result of the voltage and current multiplying is lower, on the other hand the loses of the main switch can be reduced.
Bimbingan Teknis dan Penyerahan Mesin Pengaduk Adonan Dodol Asmat Purba; Darwinto Darwinto; Agus Saleh; Yoddy Agung Nuhgraha
Cahaya Pengabdian Vol. 3 No. 1 (2026): Juni
Publisher : Apik Cahaya Ilmu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61971/cp.v3i1.324

Abstract

This article discusses technical guidance and the handover of the dodol dough mixer machine. Until now, the dodol dough has been made manually and can take three to five hours per batch. Besides being less hygienic and efficient, dodol craftsmen cannot fulfill large orders, making them feel overwhelmed. The author uses literature review and interviews with dodol craftsmen in the Parongpong area of West Bandung. The aim of this study is to examine the extent of success brought by the dodol dough mixer machine in terms of production, cleanliness of dodol, and sales efficiency.
Optimasi Pole Rekursif Infinite Impulse Response Menggunakan Grey Wolf Optimizer untuk Meningkatkan Kualitas Resonator Hamdani Setiawan; Rahmad Hidayat; Givy Devira Ramady; Anung Anung; Yoddy Agung Nuhgraha
Digital Transformation Technology Vol. 6 No. 1 (2026): Periode Maret 2026
Publisher : Information Technology and Science(ITScience)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47709/digitech.v6i1.8937

Abstract

Resonator digital berbasis Infinite Impulse Response (IIR) merupakan salah satu struktur yang banyak digunakan sebagai pembangkit gelombang sinusoidal karena memiliki kompleksitas komputasi yang rendah dan selektivitas frekuensi yang tinggi. Namun, metode desain konvensional umumnya menggunakan koefisien tetap yang diperoleh secara analitis sehingga belum menjamin performa optimum terhadap parameter bandwidth dan faktor kualitas (Q-factor). Penelitian ini mengusulkan metode optimasi penempatan pole pada resonator rekursif IIR orde dua menggunakan algoritma Grey Wolf Optimizer (GWO). Setiap solusi direpresentasikan sebagai posisi pole yang menentukan karakteristik resonator. Fungsi objektif dirancang secara multi-kriteria dengan mempertimbangkan kesalahan frekuensi resonansi, bandwidth, faktor kualitas, dan kestabilan sistem. Simulasi dilakukan pada frekuensi sampling 12 kHz dengan target frekuensi resonansi 2 kHz dan 4 kHz. Hasil optimasi menunjukkan bahwa metode GWO mampu menghasilkan bandwidth yang lebih sempit, faktor kualitas yang lebih tinggi, serta kesalahan frekuensi yang lebih kecil dibandingkan metode desain resonator konvensional. Hasil penelitian menunjukkan bahwa GWO efektif digunakan untuk meningkatkan performa resonator digital pada aplikasi pembangkit gelombang dan pemrosesan sinyal adaptif
Co-Authors Agung Wirjawan Agus Saleh Agus Saleh Agus Saleh Anung - Anung Anung Asmat Purba Darwinto Darwinto Eling Selasri Elvathna Syafwan Eva Damayanti Firdhani Faujiyah Gerinata Ginting Giofani Samsi Jordi Givy Devira Ramady Hamdani Setiawan Muchamad Sobri Sungkar Muhammad Abdul Rofik Rahmad Hidayat Riky Adhiharto Riri Damayanti Apnena Rizal Maulana Rizki Ramdani Rizki Ramdani