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Rancang Bangun Mesin Uji Abrasi Material Alumunium Terhadap Pelumasan Oli Eko Saputra, Aditiya Wahyu; Wulandari, Diah; Sakti, Arya Mahendra; Puspitasari, Dewi
Jurnal Rekayasa Mesin Vol 11 No 01 (2026): JRM April 2026 (In Press)
Publisher : Universitas Negeri Surabaya

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Abstract

Abrasion is a common wear mechanism that occurs in machine components due to repeated frictional contact, particularly in aluminum materials that are widely used because of their light weight and corrosion resistance. Nevertheless, aluminum remains susceptible to wear when the lubrication system does not perform optimally. This study aims to design and develop a laboratory-scale abrasion testing machine and to analyze the effect of rotational speed on the wear behavior of aluminum 6061 under oil lubrication. The research employed a research and development method consisting of design, fabrication, assembly, functional testing, and abrasion testing stages. Abrasion tests were conducted at rotational speeds of 500, 1000, and 1500 RPM with a constant load of 3 kg, a test duration of 30 minutes, and Shell SAE 10W-30 oil as the lubricant. Quantitative data were obtained from the measurement of specimen mass loss before and after testing, while qualitative analysis focused on machine performance and operational stability during testing. The results indicate that the developed abrasion testing machine operated properly and was capable of producing consistent wear data. The mass loss of aluminum specimens increased with higher rotational speeds, with the highest average wear observed at 1500 RPM. This study contributes by providing a simple and cost-effective abrasion testing machine for laboratory applications and by offering insights into the influence of rotational speed on the wear behavior of aluminum under lubricated conditions.
Redesign of A Cake Batter Mixing Machine Using A Stepped Pulley Ramadhan, Rafli Rizki; Riandadari, Dyah; Wulandari, Diah; Sofi, Nurul Ainu
Madani: Jurnal Ilmiah Multidisiplin Vol 4, No 1 (2026): February 2026
Publisher : Penerbit Yayasan Daarul Huda Kruengmane

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5281/zenodo.18507000

Abstract

One of the key elements in making high-quality sponge cake batter is consistent and precise mixing, ensuring all ingredients are well-blended and producing the air bubbles necessary for softness. The aim of this machine redesign was to overcome the limitations of the previous design by using a multi-stage pulley. By redesigning the machine, it can be tailored to more specific operational needs, improve product quality, and minimize wasted time. To achieve this goal, the sponge cake mixer, which previously used a fixed-size pulley system, was updated to be more efficient in regulating rotation speed. Therefore, research was conducted by replacing the pulley size variations with a 5-inch diameter with 840 rpm, 6 inches with 700 rpm, and 7 inches with 600 rpm. During the testing process, the dough was mixed and the time required until the dough was ready was recorded.Based on the results of the trial using a multi-level pulley, it was found that the average time for mixing sponge cake batter with a 5-inch pulley produced an average time of 37 minutes, while a 6-inch pulley produced an average time of 46 minutes, and for a 7-inch pulley produced an average time of 55 minutes. A 5-inch diameter pulley is the appropriate size for use in a redesigned sponge cake batter mixer machine because it produces the fastest mixing time, which is an average of 37 minutes, with a rotation speed of 840 rpm. This pulley size is able to increase the efficiency of production time without reducing the quality of the dough mixing results
Analisis Komposisi Bahan Bakar Terhadap Proses Pembakaran pada Kompor Berbahan Bakar Oli Bekas Mubin, Moh. Nurul; Riandadari, Dyah; Wulandari, Diah; Nugroho, Aji
Madani: Jurnal Ilmiah Multidisiplin Vol 4, No 1 (2026): February 2026
Publisher : Penerbit Yayasan Daarul Huda Kruengmane

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5281/zenodo.18437715

Abstract

Waste management issues have become a national concern with serious impacts on social, economic, health, and environmental aspects. The low level of awareness among communities and industrial actors in managing waste has contributed to environmental pollution. Along with the development of cities and regions, the volume of waste including used lubricating oil from vehicles and motorized machinery continues to increase. Not only in large cities, but small workshops in rural areas also generate used oil waste, resulting in its widespread distribution across Indonesia. This study employed a field experimental method. The approach was conducted by testing fuel mixture compositions in a stove fueled by used oil to observe the effect of fuel composition on the combustion process. The results indicate that variations in fuel composition significantly affect combustion quality. In the mixture of used oil and kerosene, a ratio of 40:60 produced the highest flame temperature of 378°C, the fastest cooking time of 4.05 minutes, and a blue flame indicating more optimal combustion. In contrast, the 60:40 mixture resulted in the lowest temperature of 318°C, the longest cooking time of 5.07 minutes, and a predominantly orange flame. For the mixture of used oil and biodiesel (biosolar), the 40:60 ratio also demonstrated the best performance, achieving the highest flame temperature of 380°C, the fastest cooking time of 3.52 minutes, and a stable blue flame.
Pengaruh Variasi Ketebalan Penampang Segiempat pada Crashbox Terhadap Kemampuan Menyerap Energi Prasetiyo, Prembayun; Wulandari, Diah; Abdi, Ferly Isnomo; Nugroho, Aji
Automotive Innovations Journal Vol. 2 No. 1 (2026): March
Publisher : Department of Automotive Engineering Technolgy

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Abstract

Tingginya angka kecelakaan lalu lintas dengan tipe tabrakan frontal mendorong pengembangan sistem keselamatan pasif kendaraan, salah satunya adalah Crashbox. Crashbox berfungsi menyerap energi tumbukan melalui deformasi plastis sehingga gaya yang diteruskan ke struktur kendaraan dan penumpang dapat diminimalkan. Penelitian ini bertujuan untuk menganalisis pengaruh variasi ketebalan penampang segiempat terhadap kemampuan penyerapan energi dan karakteristik deformasi Crashbox. Metode yang digunakan adalah simulasi numerik berbasis Finite Element Analysis (FEA) menggunakan perangkat lunak ANSYS Explicit Dynamics. Model Crashbox berbahan aluminium alloy AA6061-T6 dianalisis dengan variasi ketebalan 2 mm, 3 mm, dan 4 mm. Simulasi tumbukan dilakukan secara aksial dengan kecepatan impactor 15,6 m/s dan massa 100 kg. Parameter crashworthiness yang dianalisis meliputi Energy Absorption (EA), Specific Energy Absorption (SEA), Mean Crushing Force (MCF), Initial Peak Force (IPF), dan Crash Load Efficiency (CFE). Hasil simulasi menunjukkan bahwa peningkatan ketebalan Crashbox meningkatkan kemampuan penyerapan energi dan kestabilan deformasi. Crashbox dengan ketebalan 4 mm menghasilkan nilai EA tertinggi sebesar 6,862 kJ, SEA sebesar 13,92 kJ/kg, serta CFE sebesar 38,57%, dengan pola deformasi progressive axial folding yang paling stabil. Hasil penelitian ini menunjukkan bahwa variasi ketebalan penampang segiempat berpengaruh signifikan terhadap kinerja crashworthiness Crashbox dan dapat menjadi referensi dalam perancangan sistem keselamatan kendaraan.
ANALISIS STABILITAS KEUANGAN BANK ALADIN SYARIAH BERDASARKAN ROA, CAR, DAN NPF PERIODE 2015–2024 Rozi, Ahmat Fahrul; Safitri , Novi Angga; Wulandari, Diah; Sayuti, Muhammad Noor
Journal of Economic, Bussines and Accounting (COSTING) Vol. 8 No. 4 (2025): COSTING : Journal of Economic, Bussines and Accounting
Publisher : Institut Penelitian Matematika, Komputer, Keperawatan, Pendidikan dan Ekonomi (IPM2KPE)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31539/9wr09h29

Abstract

Penelitian ini bertujuan untuk menganalisis stabilitas keuangan Bank Aladin Syariah selama periode 2015 hingga 2024 berdasarkan tiga indikator utama: Capital Adequacy Ratio (CAR), Return on Assets (ROA), dan Non-Performing Financing (NPF). Ketiga indikator tersebut mencerminkan aspek ketahanan modal, profitabilitas, dan kualitas pembiayaan yang menjadi dasar dalam mengevaluasi kondisi stabilitas keuangan suatu bank. Metode yang digunakan adalah pendekatan kuantitatif deskriptif dengan menelaah tren tahunan masing-masing indikator berdasarkan data laporan keuangan yang dipublikasikan oleh Bank Aladin Syariah. Hasil penelitian menunjukkan bahwa CAR berada dalam posisi sangat kuat sepanjang periode, meskipun menurun sejak 2022 akibat optimalisasi modal untuk pembiayaan produktif. Sementara itu, ROA cenderung fluktuatif dan sempat mengalami defisit selama beberapa tahun terakhir, namun mulai menunjukkan perbaikan secara bertahap. NPF menunjukkan kinerja luar biasa dengan rasio 0,00% selama tujuh tahun berturut-turut, menandakan risiko pembiayaan yang sangat rendah. Temuan ini memperlihatkan bahwa stabilitas keuangan Bank Aladin Syariah relatif terjaga dengan baik, terutama dari sisi permodalan dan manajemen risiko kredit, meskipun efisiensi profitabilitas masih menjadi tantangan yang perlu dibenahi. Penelitian ini memberikan kontribusi empiris terhadap penguatan literatur stabilitas keuangan bank syariah di tengah dinamika transformasi kelembagaan.
RANCANG BANGUN MESIN PENCACAH RUMPUT GAJAH UNTUK PROSES PEMBUATAN SILASE PAKAN TERNAK SAPI Genta Arya Rahma Mahendra, Genta; Wulandari, Diah; Utama, Firman Yasa; Widoretno, Yustin Setiya
Jurnal Rekayasa Mesin Vol 11 No 01 (2026): JRM April 2026 (In Press)
Publisher : Universitas Negeri Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26740/jrm.v11i01.75196

Abstract

Silage is a method of providing cow feed that requires a forage chopping process so that it is easy to ferment and has a longer shelf life. However, most breeders still do the enumeration manually, so it takes a long time and the size of the enumeration is not uniform. Therefore, this study aims to design an elephant grass chopper with dual input and output funnels, equipped with a knife and a beater to speed up cutting and crush harder materials. This machine is expected to be able to produce a uniform size of 2–5 cm according to the SNI 7785.1:2003 standard This research method uses a 4D Research and Development (R&D) model to design and test a elephant grass chopper. The stages include literature review, design, machine construction and assembly, and then functional testing using elephant grass as the test material in three trials. The test data is analyzed to assess the machine's performance and feasibility. The results of the study show that the designed elephant grass chopper can operate well. Based on the function test at 1500 rpm with a test material load of 5 kg, the machine produces a chopping size of 2–5 cm with a working capacity of 92 kg/hour, so it is considered suitable for use to support the process of making silage for cattle feed and increase efficiency compared to manual methods.
Analisis Sudut Pisau Pada Mesin Pencacah Rumput Gajah Untuk Pembuatan Silase Pakan Ternak Sapi Nugraha, Muhammad Erlangga Adi; Wulandari, Diah; Utama, Firman Yasa; Nugroho, Aji
Jurnal Ilmu Ekonomi, Pendidikan dan Teknik Vol. 3 No. 1 (2026): IDENTIK - Januari
Publisher : CV. SINAR HOWUHOWU

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70134/identik.v3i1.1285

Abstract

This study examines how the blade angle of an elephant grass chopping machine affects the chopping results used for making cattle feed silage. Elephant grass needs to be chopped to a standard size for silage production, with the ideal chop length ranging from 2–5 cm and relatively uniform, so that the fermentation process runs properly and the feed is easier for livestock to consume. The research was conducted using an experimental method with 1 kg of fresh elephant grass for each trial. The chopped output was classified into three size categories: <2 cm, 2–5 cm, and >5 cm, to determine which met the silage standard most effectively. The study tested three blade angles—30°, 45°, and 60°—and three machine rotational speeds (1700 rpm, 2000 rpm, and 2300 rpm) to evaluate their effects on chopping time, cut size distribution, and processing capacity. The results show that the best performance in terms of machine rotational speed at the 30° blade angle occurred at 2300 rpm. The highest percentage of chopped material within the 2–5 cm size range was obtained at a 45° blade angle, reaching approximately 55–58% of the total chopped output, indicating the most optimal conformity with silage size standards.
Analisis Pembebanan Statik Pada Wheelset Kereta Api Menggunakan Perangkat Lunak Ansys Workbench Mubarok, Dio Dwi; Wulandari, Diah; Davareza, Tinton; Firmansyah, Ganda Putra
Metrotech (Journal of Mechanical and Electrical Technology) Vol 5 No 1: Januari 2026
Publisher : Fakultas Sains dan Teknologi, UNIRA Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70609/metrotech.v5i1.8723

Abstract

Wheelset merupakan salah satu komponen vital pada kereta api yang berperan dalam memikul beban, menjaga kestabilan gerak, serta memastikan kontak roda–rel berjalan dengan baik. Kerusakan pada Wheelset berpotensi menyebabkan deformasi berlebih, penurunan faktor keamanan, hingga risiko kecelakaan, sehingga diperlukan analisis struktural untuk menjamin keandalannya. Penelitian ini bertujuan mengevaluasi respons struktural Wheelset terhadap pembebanan statik melalui metode Finite Element Analysis (FEA) menggunakan ANSYS Workbench 17.2. Proses penelitian mencakup pembuatan model 3D, penentuan material ASTM A36, pengaturan meshing, penetapan kondisi batas, serta pemberian gaya vertikal sebesar 200.000 N sesuai standar beban gandar. Hasil simulasi menunjukkan bahwa deformasi maksimum sebesar 0,24436 mm masih berada dalam batas elastis material; tegangan utama maksimum sebesar 64,281 MPa jauh di bawah nilai luluh 250 MPa; dan nilai safety factor minimum 3,7155 mengindikasikan struktur berada dalam kondisi aman. Dengan demikian, Wheelset dinilai mampu menahan pembebanan statik secara optimal. Untuk penelitian mendatang, disarankan penambahan analisis beban dinamis, kajian kelelahan material, serta perbandingan material alternatif guna meningkatkan performa struktural Wheelset.
Peningkatan Hasil Belajar IPAS melalui Flipbook Ancient Treasures Unlocked di SD Kelas IV Octaura, Mega Raisya; Al Djumariah, Dhea; Wulandari, Diah; Hanifah, Nasywa; Rahayu, Sri
Jurnal Pengajaran Sekolah Dasar Vol. 5 No. 1 (2026): Jurnal Pengajaran Sekolah Dasar
Publisher : EDUPEDIA PUBLISHER

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56855/jpsd.v5i1.1880

Abstract

Pembelajaran IPAS pada materi peninggalan sejarah di sekolah dasar masih menghadapi kendala berupa keterbatasan media pembelajaran yang menarik dan interaktif yang berdampak pada hasil belajar siswa. Penelitian ini bertujuan untuk meningkatkan hasil belajar IPAS melalui penggunaan media flipbook digital “Ancient Treasures Unlocked”. Penelitian menggunakan metode kuantitatif dengan dengan desain Penelitian Tindakan Kelas (PTK) model Kurt Lewin yang dilaksanakan dalam 4 tahap: perencanaan, tindakan, pengamatan, dan refleksi. Subjek penelitian ini adalah 19 siswa kelas IV di SDN Sindangraja. Hasil penelitian menunjukkan peningkatan belajar siswa sebesar 53%. Temuan ini membuktikan bahwa kombinasi media flipbook interaktif dan model PjBL tidak hanya meningkatkan hasil belajar saja, namun juga terbukti mendorong keterlibatan aktif serta pemahaman siswa di dalam pembelajaran. Dengan demikian, media flipbook digital interaktif “Ancient Treasures Unlocked” yang diintegrasikan dengan PjBL direkomendasikan sebagai alternatif media pembelajaran IPAS yang efektif untuk meningkatkan hasil belajar siswa sekolah dasar.
Co-Authors ', Usman 'Ilmi, Muhammad Iklil Ulil Adam, Fian Adidya Adham Rifai, Hasif ADIYANTORO, ARI Affandi, Bagus Rizal Afghan, Fayyadh Buddy Al AFIF HIDAYAT, AHMAD Afifah, Hidayanti Nuzulatul Aidah, M. Fishal Askarul Faris Aji Nugroho Akbar, Mokhamad Rizky Al Djumariah, Dhea Al Fath Hasby Ash Shiddiqy, Yhun Alam, Ilham Rofiqul Alfadilla, Muhammad Fajar ALFIANTO, RENDI Amalia, Sefi Ambarita, Gilbert Doni AMNA, MUSTAFID Anatri Desstya Andrian Andrian Ariana Setiani Arifianti, Lailatus Sa'diyah Yuniar Arruafy, Mohammad Ghithrof Arya Mahendra Sakti Atiqoh, Nisrina Bayu Kurniawan Bin Laday, La Dedy Augustino Cahyo Nugroho, Cahyo Chinsa, Iqbal Rifky Davareza, Tinton Dewanti Handayani, Sri Sularti Dewi Puspitasari Dyah Riandadari Eka, Yuliasti Eko Marsyahyo Eko Saputra, Aditiya Wahyu Fachry Abda El Rahman FARADILLA FIRDAUSY, MEUTIA Farizi, Aziizun Faiq Al Fatahillah, Idham Rizki Yusma Febrianto, Andrie Seva Ferly Isnomo Abdi Fikri, Zainur Rijalul Firdaus, Oktavian Bachtiar Firiski, Edwi Febrian Firman Yasa Utama Firman Yasa Utama Firmansyah, Ganda Putra Firmansyah, Rian Ganda, Andita Ganda, Andita Nataria Fitir Ganda, Andita Nataria Fitri Gegatama, Muhammad Henwa Genta Arya Rahma Mahendra, Genta Hanifah, Nasywa Hardinansya, Farid Aziz Hartuti Purnaweni Hermawan, Dedy Andy Hudaya, Adam Aryadana Ibad, Muhamad Nahrudin Irfa’i, Mochamad Arif IRFAN MAULANA, MUHAMMAD Irwandy Syofyan Kembaren, Julbintor Kusuma, Muhammad Dewantara Kusuma, Rachmad Andrian Jaya Mahendra, Genta Arya Rahma Manggalasari, Lena Citra MARTINO, SANDI Marzad, Deftana Aqsya Mubarok, Dio Dwi Mubin, Moh. Nurul Muhammad Riza Hafizi Mujakki, Muhammad Akbar Murti, Dafa Aditya Naqsyabandi, Ananda Rafly Naufal, Bayu Ahmad Nosuvian, Joko Laksono Novi Resmini Nugraha, Muhammad Erlangga Adi Nur, Muhammad Baihaqi Nurhadi, Jatmika Octaura, Mega Raisya Octavianissa, Icha Nur Pata Ledi, Simon Aten Permana , Iman Prasetiyo, Prembayun Prasetyo, Rafly Budi Pratama, ceisaleo Pandu PRATIYAS, FANDI Prayogo, Muhammad Putri, Annisa Rizqika Hermalia Putri, Danisha Yoananda Rachma Hasibuan Rachmanda, Reza Irfani Rachmattan, Ryan Rahman, Riandito Auki Minanda Rahputri, Rani Rakhman, Abdullah Ramadhan, Aldhi Fahrezy Ramadhan, Rafli Rizki Ramadhani A, Gilang Ridho, Mukhlis Yazid Rochaman, Nur ROHMADANININGSIH, LINDA ROUDHOTUL HARIRIN, SITI Rozi, Ahmat Fahrul Rusli, Ghozy Meiky Ryandadari, Dyah Safitri , Novi Angga Saputra, Prihatama Wahyu Sayuti, Muhammad Noor Sedjati, Moch. Ari Wibowo Shadiq, Muhammad Difa Ash Sofi, Nurul Ainu Sri Endah Wahyuningsih SRI RAHAYU Sudana, Undang Sugianto, Albert Sulistyorini, Elisa Suryonegoro, Satrio Adi Sutriyono Titik Djumiarti Toni Prahasto Trimanah, Trimanah Trimariyono, Dimas Ubaidillah, Moch. Rizal Vincencius Gunawan, Vincencius WARJU Widiyanti, Prastiwi Wahyu Widoretno, Yustin Setiya Widyastuti, Yani Winoto, Roy Ariel Wulandari, Cyndhi Kartika Yuda, Mohammad Wira Yulianto, Angki Narda Zainal Abidin