Article Per Year (5 Year)
p-Index From 2021 - 2026
1.953
P-Index
This Author published in this journals
All Journal Jurnas Nasional Teknologi dan Sistem Informasi Sistemasi: Jurnal Sistem Informasi Industria: Jurnal Teknologi dan Manajemen Agroindustri JITMI (Jurnal Ilmiah Teknik dan Manajemen Industri) Jurnal Teknik Mesin Jurnal Teknik Mesin Cakram INVENTORY : Industrial Vocational E-Journal On Agroindustry Journal of Industrial Community Empowerment SAINTI: Majalah Ilmiah Teknologi Industri
Alfi, Rizki
Unknown Affiliation
Agriculture, Biological Sciences & Forestry Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Medicine & Pharmacology Other

Published : 12 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 12 Documents
Search

 1   2 
Penerapan Pengendalian Persediaan Bahan Baku dengan Model Probabilistik dan Sistem Kuantitas Pemesanan Tetap Alfi, Rizki; Harif, Muhammad; Pharmayeni
INVENTORY: Industrial Vocational E-Journal On Agroindustry Vol. 3 No. 1 (2022)
Publisher : Politeknik ATI Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.52759/inventory.v3i1.71

Abstract

Inventory of raw materials is very important for the smooth production of the company and meet consumer demand for the company in market demand. The demand for tire production fluctuates and causes the demand for products not to need to be met to order, due to the shortage of raw materials. To solve the shortage of raw materials, the company holds special orders in consideration of savings in ordering the cost of ordering messages. To overcome the shortage of raw materials, the company holds special orders or sudden orders which will increase the cost of the message. The purpose of this study is to determine the optimum ordering of raw materials to minimize total inventory costs by using a probability model of raw material inventory control with a fixed order quantity system (Q method). From the results of research using the probabilistic model of inventory control method Q method, obtained the optimal order quantity (q*), reorder point (rop), and safety stock (ss) with total inventory costs more efficient compared to the total inventory costs of the company's current policies. what is to be achieved in inventory control is to minimize the cost of ordering, and the cost of savings to the company.
Pengaruh Viskositas Oli terhadap Reduksi Amplitudo Getaran pada Sistem Redaman Viskus: Studi Eksperimental Alfi, Rizki; Rudianto; Harif, Muhammad; Sukma, Ari Aditia
Jurnal Teknik Mesin Cakram Vol. 8 No. 2 (2025): Jurnal Teknik Mesin Cakram
Publisher : Universitas Pamulang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32493/jtc.v8i2.54685

Abstract

Redaman viskus memiliki peranan penting dalam pengendalian getaran mekanik dengan mengonversi energi osilasi menjadi energi panas melalui fluida pelumas. Penelitian ini menyajikan evaluasi eksperimental pengaruh tingkat viskositas oli terhadap karakteristik peluruhan amplitudo pada sistem massa–pegas–peredam yang berosilasi bebas. Empat oli komersial digunakan sebagai variabel redaman, yakni SAE 20, SAE 40, SAE 60, dan SAE 140. Parameter utama yang diamati meliputi pengurangan logaritmik (δ), rasio redaman (ζ), dan persentase peluruhan amplitudo dalam beberapa siklus osilasi. Hasil memperlihatkan adanya peningkatan yang konsisten pada kemampuan redaman seiring kenaikan viskositas; nilai ζ meningkat dari 0,08 (SAE 20) menjadi 0,18 (SAE 140) dan persentase peluruhan amplitudo dari 8,02% menjadi 17,10%. Temuan ini menegaskan bahwa pemilihan viskositas fluida merupakan parameter desain kunci untuk meningkatkan disipasi energi pada sistem redaman viskus di berbagai aplikasi, termasuk suspensi kendaraan dan peredam industri. Abstract: Viscous damping plays a crucial role in controlling mechanical vibrations by converting oscillatory energy into heat energy through a lubricating fluid. This study presents an experimental evaluation of the effect of oil viscosity on the amplitude decay characteristics of a freely oscillating damper–spring–mass system. Four commercial oils were used as damping variables, namely SAE 20, SAE 40, SAE 60, and SAE 140. The main parameters measured include logarithmic decrement (δ), damping ratio (ζ), and percentage decay amplitude over several oscillation cycles. The results show a consistent increase in damping capability with increasing viscosity; the ζ value increases from 0.08 (SAE 20) to 0.18 (SAE 140), and the percentage decay amplitude from 8.02% to 17.10%. These findings confirm that fluid viscosity selection is a key design parameter for improving energy dissipation in viscous damping systems in various applications, including vehicle suspension components and industrial dampers.
Co-Authors Abdul Aziz Ari Aditia Sukma Arsil, Fikri Azzahra, Aziza Demi Ramadian, Demi Gustiarini Rika Putri Harif, Muhammad Hermiza Mardesci Maria Isfus Senjawati Maryam Maryam Muhyi, Asep Abdul Nadiyah, Khairun Nofriadi Nofriadi Nur Zen Hasanah Pharmayeni Pharmayeni Pharmayeni Rifkiah, Ria Romadhan, Hendro Rudianto Rudianto Rudianto Ruzita Sumiati Sardani, Rizaldi Syahmer , Verra Syahmer, Verra Triyani, Wulan