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All Journal Jurnal Rekayasa Energi dan Mekanika International Journal of Innovation in Mechanical Engineering and Advanced Materials
Octaviani, Ana Nur
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Aerospace Engineering Automotive Engineering Control & Systems Engineering Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering

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Studi Komparatif Pengaruh Asam Fosfat terhadap Sifat Fisik dan Mekanik NR dan EPDM Octaviani, Ana Nur; Feriyanto, Dafit; Kurniawan, Kurniawan; Arti, Dewi Kusuma; Nur, Hery
Jurnal Rekayasa Energi dan Mekanika Vol 4, No 2 (2024): JREM
Publisher : Institut Teknologi Nasional, Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26760/JREM.v4i2.146

Abstract

Natural Rubber (NR) dan Ethylene Propylene Diene Monomer (EPDM) adalah material karet yang banyak digunakan dalam komponen otomotif seperti bushing karena sifat elastisitas dan daya tahannya. Namun, paparan bahan kimia agresif seperti asam fosfat dapat memengaruhi sifat mekanik dan fisik kedua material ini. Penelitian ini bertujuan untuk mengevaluasi pengaruh perendaman dalam larutan asam fosfat dengan konsentrasi 13% terhadap kekuatan tarik, kekerasan, dan struktur mikro NR dan EPDM. Hasil pengujian menggunakan Mesin (UTM) Universal Testing Machine menunjukkan bahwa NR mengalami penurunan pada kekuatan tarik tegangannya NR sebesar 20,44% dan EPDM sekitar 23,8% setelah perendaman,dan untuk nilai regangannya penurunan NR sebesar 38,3% dan EPDM sekitar 17,43%  disebabkan oleh degradasi rantai polimernya. Penurunan kekerasan NR yang diuhi menggunakan Shore A mencapai 19,2%, sedangkan EPDM hanya sekitar 4,81%. Hasil struktur mikro dengan perbesaran 20x, 50x dan 100x dari kedua jenis karet pun menunjukkan bahwa tidak banyak perubahan yang dapat teramati. Temuan ini mengindikasikan bahwa EPDM lebih unggul dalam aplikasi yang melibatkan paparan bahan kimia seperti asam fosfat, menjadikannya pilihan yang lebih sesuai untuk bushing dalam lingkungan kerja yang agresif.
Study of Eigenvalues and Matrix Eigenvectors Using MATLAB: Vibration Systems of Multi-Purpose Vehicle (MPV) Octaviani, Ana Nur; Khaerudini, Deni Shidqi; Feriyanto, Dafit; Timuda, Gerald Ensang; Darsono, Nono; Chollacoop, Nuwong
International Journal of Innovation in Mechanical Engineering and Advanced Materials Vol 6, No 3 (2024)
Publisher : Universitas Mercu Buana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22441/ijimeam.v6i3.25351

Abstract

Vehicle vibration is a critical factor influencing both passenger comfort and vehicle performance. In this study, we analyze the multi-degree-of-freedom (MDOF) vibrational behavior of a multi-purpose vehicle (MPV) using matrix eigenvalue and eigenvector methods. The vehicle’s dynamics are modeled by developing a set of equations of motion that account for the forces acting on the front and rear tires, car body, and pitch angle. MATLAB is utilized to numerically compute the system’s eigenvalues and eigenvectors, representing the natural frequencies and vibration modes of the vehicle, respectively. The analysis focuses on the vehicle’s response to a 50 mm displacement at the front tire, simulating the effect of road disturbances. The resulting vibrations in the front and rear tires, car body, and vehicle pitch are illustrated over a 1-second time frame. The findings show that the front tire experiences the largest oscillation amplitude of ±1 mm, while the rear tire exhibits a much smaller displacement of ±0.04 mm. The overall car body displacement reaches a maximum amplitude of ±1.3 mm, indicating partial damping of the front tire vibrations. However, the results reveal that the vehicle’s suspension system lacks effective damping, as the vibrations do not decrease over time. This behavior could negatively impact ride comfort and safety, particularly on uneven roads. The study concludes that improvements to the vehicle’s suspension system are necessary to enhance damping performance. The presented MATLAB-based approach offers a valuable tool for analyzing and optimizing vehicle vibration systems.
Co-Authors Chollacoop, Nuwong Dafit Feriyanto Deni Shidqi Khaerudini Dewi Kusuma Arti Gerald Ensang Timuda Kurniawan Kurniawan Nono Darsono, Nono Nur, Hery