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Arif Mulyanto
Universitas Mataram
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KARAKTERISTIK GETARAN DALAM BENTUK WAVEFORM DAN SPEKTRUM MELALUI TRANSFORMASI FOURIER Salman; I Dewa Ketut Okariawan; Nurchayati; Arif Mulyanto; Emmy Dyah Sulistyowati
Energy, Materials and Product Design Vol. 4 No. 2 (2025): Energy, Materials and Product Design
Publisher : Jurusan Teknik Mesin dan Industri, Fakultas Teknik, Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/enatq908

Abstract

The analysis of machine vibration is therefore essential for predictive maintenance and condition monitoring. Modern approaches, ranging from time-domain measurements of acceleration, velocity, and displacement to frequency-domain and modal analysis. This study investigates the vibration characteristics of rotating equipment in a manufacturing environment, focusing on identifying dominant frequencies, evaluating amplitude trends, and assessing overall machine condition. Data collected from accelerometers mounted on a centrifugal pump were processed using time-domain and frequency-domain techniques. The results highlight clear signatures of imbalance and bearing wear, demonstrating the value of predictive maintenance based on vibration monitoring. As the result the amplitude–frequency spectrum demonstrates that the machine is primarily influenced by rotational imbalance, with minimal evidence of high-frequency faults.
The Sosialisasi Pemanfaatan Limbah Sampah Sebagai Peluang Usaha di Desa Seruni Mumbul, Kabupaten Lombok Timur Ahmad Akromul Huda; Arif Mulyanto; Syarif Hidayatullah; Agustono Setiawan; A’an Nurfajatun
Jurnal Pengabdian Masyarakat IPTEKS Vol. 12 No. 1 (2026): PENGABDIAN MASYARAKAT IPTEKS
Publisher : Universitas Muhammadiyah Jember

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Abstract

Permasalahan sampah merupakan isu lingkungan yang terus meningkat, terutama pada wilayah dengan aktivitas wisata yang berkembang pesat seperti Desa Seruni Mumbul, Kabupaten Lombok Timur. Rendahnya pemahaman masyarakat tentang pengolahan sampah menyebabkan limbah belum dimanfaatkan secara optimal sebagai sumber daya bernilai ekonomi. Kegiatan pengabdian Program BAKTI MESIN 2025 dilaksanakan untuk meningkatkan pengetahuan masyarakat mengenai pengelolaan sampah berbasis ekonomi sirkular melalui sosialisasi yang mengintegrasikan ceramah interaktif dan media audio-visual. Sosialisasi dilakukan dengan menghadirkan narasumber yang memberikan materi terkait pengolahan limbah organik menjadi kompos, biogas, maggot, serta pemanfaatan limbah plastik menjadi produk bernilai tambah seperti ecobrick dan paving block. Evaluasi kegiatan dilakukan menggunakan pretest dan posttest untuk mengukur peningkatan pengetahuan peserta. Hasil evaluasi menunjukkan adanya kenaikan rata-rata nilai dari 44,00 menjadi 90,00, dengan uji paired sample t-test menghasilkan nilai signifikansi p = 0,000 < 0,05, yang menandakan peningkatan pengetahuan yang signifikan. Capaian keberhasilan program mencapai 90% dan melampaui target awal sebesar 80%. Hasil ini menunjukkan bahwa sosialisasi efektif dalam meningkatkan literasi, kesadaran, dan motivasi masyarakat untuk mengolah sampah secara mandiri dan mengembangkan peluang usaha berbasis limbah. Kegiatan ini menjadi langkah strategis dalam mendukung penerapan ekonomi sirkular di desa wisata serta membuka peluang pengembangan usaha yang berkelanjutan.
Performance of an Air-Water Harvester Machine under Various Inlet Air Relative Humidity Conditions Mirmanto Mirmanto; Made Wirawan; Faniar Reza Khatami; Arif Mulyanto; Yesung Allo Padang; Nurchayati Nurchayati; Jayus Kharisma Hendra
Jurnal Rekayasa Mesin Vol. 21 No. 2 (2026): Volume 21, Nomor 2, Agustus 2026
Publisher : Mechanical Engineering Department - Semarang State Polytechnic

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Abstract

Atmospheric water harvesting (AWH) using vapor-compression refrigeration systems has emerged as a promising approach for decentralized freshwater production. Although previous studies have investigated the effects of refrigeration-system configurations and operating parameters on water production, the influence of inlet air relative humidity on freshwater productivity, heat-transfer characteristics, and thermodynamic performance has not been comprehensively evaluated within a single experimental framework. This study experimentally investigates the performance of an air-water harvester operating at inlet relative humidities of 30%, 50%, and 70% under controlled laboratory conditions. Freshwater production, coefficient of performance (COP), total heat absorbed by the evaporator, and evaporator efficiency were evaluated using measurements of temperature, pressure, airflow velocity, electrical power consumption, and psychrometric properties. The results show that increasing inlet relative humidity significantly enhanced condensation and system performance, yielding the highest freshwater production of 0.345 kg and the maximum COP of 12.19 at 70% RH. In contrast, the highest evaporator efficiency (11.89%) and total heat absorbed by the evaporator (167.81 W) were obtained at 30% RH, where sensible heat transfer dominated the cooling process. The findings indicate that inlet air relative humidity strongly influences the distribution of sensible and latent heat transfer, thereby affecting both freshwater production and energy performance. This study provides an integrated experimental assessment of the thermodynamic response of refrigeration-based AWH systems to varying inlet humidity and offers practical guidance for optimizing system operation in humid tropical environments.
Co-Authors Achmad - Zainuri Agus Dwi Catur Agus Dwi Catur agus dwi catur Agustono Setiawan Ahmad Akromul Huda Anak Agung Alit Triadi Anak Agung Alit Triadi A’an Nurfajatun Buyung Anugerah Dimi Frasepta Ilhami E.D. Sulistiowati Emmy Dyah Sulistyowati Emmy Dyah Sulistyowati Faniar Reza Khatami Hendry Sakke Tira, Hendry Sakke Huda, Ahmad Akromul I . G.N.K Yudhyadi I Made Adi Sayoga I Made Nuarsa I Wayan Joniarta I.D.K. Okariawan Ida Bagus Alit IGB Dipa Maha Putra Ika Yuni Astuti Ikhsan Mujahid IMade Adi Sayoga Jayus Kharisma Hendra Khairil Anwar Fajrie Kurnia Ritma Dhanti Kurniawan Kusuma Wardani Kusuma Wardani KUSUMA WARDANI M. Mirmanto, M. Made Wijana Made Wirawan made wirawan Maptuh Bustami Muhammad Athar N. Nurchayati N.H. Sari Nasmi Herlina Sari Nur Kaliwantoro NURCHAYATI Nurchayati Nurchayati Nurpatria Nurpatria, Nurpatria Oei Stefani Yuanita Widodo Pandri Pandiatmi Paryanto Dwi Setyawan Paryanto Dwi Setyawan Regawa Bayu Pamungkas Rudy S Rudy Sutanto Sabda Astra Fanila Salman Suparman Ahmadi Syamsul Arifin Syarif Hidayatullah Syarif Hidayatullah Yesung Allo Padang Zakiyatudin Anduko Romadhon