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All Journal KAPAL Jurnal Ilmu Pengetahuan dan Teknologi Kelautan Jurnal Mechanical Machine : Jurnal Teknik Mesin Jurnal Teknik Mesin Jurnal Teknik Mesin Indonesia Jurnal Pengabdian Kepada Masyarakat (JPKM) Tabikpun Journal of Integrated and Advanced Engineering (JIAE) Aptekmas : Jurnal Pengabdian Kepada Masyarakat JUSTIMES (Jurnal Rekayasa Teknik Mesin Saburai)
Jamiatul Akmal
Jurusan Teknik Mesin, Fakultas Teknik, Universitas Lampung
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The TLP 2-DOF as an alternative model for extreme wave application Akmal, Jamiatul; Lubis, Asnawi; Tanti, Novri; Nuryanto, Nuryanto; Murti, Adam Wisnu
Kapal: Jurnal Ilmu Pengetahuan dan Teknologi Kelautan Vol 18, No 2 (2021): June
Publisher : Department of Naval Architecture - Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/kapal.v18i2.37187

Abstract

Tension Leg Platform (TLP) is an offshore platform structure used for deep-sea oil and gas exploration. The main structure of the TLP consists of a deck, pontoon, mooring system, and foundation. TLP operates in a balance of buoyancy, structural weight, and mooring tension. The problem is the construction of TLP in the deep sea, where sometimes extreme waves appear could damage the TLP structure. This paper proposes a new model of TLP that is more stable to extreme waves. The method is to separate the mass of the deck and the mass of the pontoon into two flexible parts, which are connected by a cantilever spring system. Thus the TLP motion becomes two degrees of freedom (TLP 2-DOF). Using the dynamic vibration absorber (DVA) method, the ratio of the deck mass, pontoon mass, and spring stiffness are adjusted so that the primary mass movement is minimal. Furthermore, the ratio of the amplitude of the deck movement as the primary mass to the wave amplitude is analyzed, which is known as the operator response amplitude (RAO). The results showed that the TLP 2-DOF model was more stable. As an illustration, at resonance conditions, this model can reduce RAO to about 67%.
Stress assessment pada bonding tube dengan beban tekanan eksternal Asnawi Lubis; Muhammad Rahardian Putra; Jamiatul Akmal; Novri Tanti; Ahmad Su'udi
Jurnal Teknik Mesin Indonesia Vol 17 No 1 (2022): Jurnal Teknik Mesin Indonesia
Publisher : Badan Kerja Sama Teknik Mesin Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36289/jtmi.v17i1.295

Abstract

Struktur silinder (tabung) dapat digunakan untuk sistem transportasi antar pulau, dibangun sebagai terowongan terapung terendam (SFT). Struktur utama SFT adalah tabung berlapis yang digabung dan tali tambat untuk menahan gaya apung. Kajian ini menyajikan hasil stress assessment pada tabung silinder berlapis dengan beban tekanan eksternal dari air laut. Pemodelan dan analisis dilakukan dengan metode elemen hingga menggunakan ANSYS. Tabung terdiri dari tiga lapisan: lapisan terdalam adalah baja setebal 30 mm, lapisan tengah adalah beton setebal 450 mm dan lapisan terluar adalah aluminium setebal 150 mm. Diameter dalam dan luar tabung masing-masing adalah 5 m dan 6,26 m. Beban yang diberikan adalah tekanan internal sebesar 101 kPa (1 atm) dan tekanan eksternal hidrostatis pada kedalaman 500 m sebesar 5,35 MPa. Hasil kajian menunjukkan bahwa hoop stress terbesar terjadi pada lapisan baja, diikuti oleh lapisan aluminium dan lapisan beton. Untuk radial stress yang merupakan tegangan tekan, nilai terbesar terdapat pada lapisan aluminium dan nilai yang lebih kecil terdapat pada lapisan terdalam (baja). Untuk tegangan geser, tegangan pada lapisan baja dan beton jauh lebih kecil dibandingkan dengan tegangan pada lapisan aluminium.
Perancangan mesin penghancur sekam padi dengan poros penggerak horisontal Ahmad Suudi; Novri Tanti; Jamiatul Akmal; Zulhendri Hasymi; Prasetyo Budiyanto
Jurnal Teknik Mesin Indonesia Vol 14 No 2 (2019): Jurnal Teknik Mesin Indonesia
Publisher : Badan Kerja Sama Teknik Mesin Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (351.592 KB) | DOI: 10.36289/jtmi.v14i2.115

Abstract

Husk is a waste from the grinding process with the characteristics of a hard, scaly and dry layer. In the rice milling process, according to the Agricultural Research and Development Agency, the Department of Agriculture obtained 20-30% of rice husk, 8-12% of bran and 50 - 63.5% of milled rice. It can be seen that the amount of waste produced is predominantly dominated by rice husk and if not handled it will be a problem for the environment. One effort to reduce the form of waste was carried out research design of rice husk grinding machine become powder. The implementation method starts with designing, manufacturing and testing. The design of the grinding machine is planned to use a fuel motor drive, the transmission uses a V belt and the type of grinder is a combination of discmill and hammermill.The results of research and design obtained rice husk grinding machine with specifications dimensions of 1100 mm high, 400 mm long and 500 mm wide, Hyundai gasoline engine drive HDE 390 with power 7.6 kW, elbow profile frame 50 mm x 50 mm, belt transmission and pulley with a ratio of 1: 1, a combination milling mechanism namely hammer mills which have 3 single hammer attrition mills and a front through grinder with the help of screw conveyor components. The test results of the grinding machine capacity obtained a production capacity of 10 kg / hour, and fuel consumption which is 2.162 liters / hour.
Pengaruh Ovality terhadap Kekuatan dan Ekspansi Volume pada Tangki Toroidal dengan Beban Tekanan Internal (Internal Pressure) Jamiatul Akmal
JURNAL MECHANICAL Vol 5, No 2 (2014)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Lampung

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

Abstract

Persediaan Bahan Bakar Minyak (BBM) yang semakin berkurang membuat pemerintah berusaha mengkonversi BBM ke Bahan Bakar Gas (BBG). Untuk itu, dibutuhkan penelitian-penelitian yang mendukung program pemerintah tersebut. Salah satu bidang penelitiannya yaitu dalam bidang tangki penyimpanan BBG dalam kendaraanya. Berdasarkan penelitian sebelumnya diketahui bahwa bentuk toroidal lebih baik dalam menahan stress dibandingkan bentuk silinder yang ada saat ini. Oleh karena itu, penelitian diperluas dengan memfungsikan bentuk toroidal berpenampang oval kedalam kendaraan roda empat. Secara Teori Membran bahwa semakin besar Rasio R/r, maka semakin tinggi limit tekanannya, tetapi di satu sisi semakin besar Rasio R/r maka semakin kecil volumenya. Dalam menentukan rancangan tangki toroidal terbaik, maka dipilih perbandingan jari-jari dan ovality terbaik yang dapat memberikan limit tekanan tertinggi pada tangki toroidal. Hasil analisis menunjukkan bahwa limit tekanan tertinggi diberikan oleh rasio R/r 3,4. Untuk simulasi penampang ovality baik in-plane maupun out-plane menunjukkan bahwa penampang dengan ovality 0% menghasilkan limit tekanan yang paling tinggi dalam menahan stress maksimum tangki. Berdasarkan simulasi pada ukuran tersebut didapat bahwa tangki ini memiliki limit tekanan mencapai 1,089 kali tekanan yield (py) dan pertambahan volume sebesar 0,238%. Kata Kunci : tangki toroidal, limit tekanan, ovality
WORKSHOP PENINGKATAN KEMAMPUAN PEMBUATAN DETERGEN CAIR SEBAGAI UPAYA MENGAKTIFKAN PENGURUS PKK DESA FAJAR BARU Agung Abadi Kiswandono; Nurhasanah Nurhasanah; Jamiatul Akmal
Aptekmas Jurnal Pengabdian pada Masyarakat Vol 3 No 1 (2020): APTEKMAS Volume 3 Nomor 1 2020
Publisher : Politeknik Negeri Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (796.06 KB) | DOI: 10.36257/apts.v3i1.1927

Abstract

Fajar Baru Village was originally an Karang Anyar Village, Tanjung Bintang District. The vision of this village is to Build Community Together Towards Independence. This vision is realized in the form of a mission that is with the community to realize Fajar Baru Village that is prosperous, healthy and independent. One form of prosperity and independence contained in the Medium-Term Development Plan (RPJM) of Fajar Baru Village is the growth and development of several business activity groups framed in Home Industry (home industry) activities.  The manufacture of household cleaning products, such as detergents, is one of the products that has the potential to become a Home Industry activity. Based on the results of a survey by the Implementation Team, the work program of the PKK Fajar Baru village group, especially the making of liquid soap, even though it was carried out, was only limited to making and producing for themselves (the management itself).  The results show that, the knowledge of the PKK Fajar Baru Village mothers about "Workshop on Increasing Capability of Making Liquid Detergents as an Effort to Activate the PKK Management of the Fajar Baru Village" has increased. This can be seen from the question and answer session between before and after the training. Furthermore, the partner group has succeeded in making detergents with several packaging variations
Pendampingan Pra Dan Pasca Produksi Hand Soap KUB Mulya Mandiri Desa Fajar Baru Kabupaten Lampung Selatan Heri Satria; Nurhasanah Nurhasanah; Agung Abadi Kiswandono; Jamiatul Akmal
Jurnal Pengabdian Kepada Masyarakat (JPKM) TABIKPUN Vol. 2 No. 2 (2021)
Publisher : Faculty of Mathematics and Natural Sciences - Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jpkmt.v2i2.45

Abstract

Gerakan cuci tangan yang dianjurkan oleh pemerintah selama masa pandemi Covid-19 menyebabkan masyarakat kesulitan untuk mendapatkan produk ini di pasaran. Hal ini mendorong minat KUB Mulya Mandiri untuk mengembangkan usaha home industri yang sudah ada dengan membuat produk hand soap. Tujuan kegiatan ini adalah melakukan pendampingan pra dan pasca produksi hand soap antiseptik kepada anggota KUB Mulya Mandiri. Metode yang digunakan meliputi ceramah dan praktek pembuatan serta pendampingan produksi hand soap. Hasil kuesioner kegiatan menunjukkan adanya peningkatan pengetahuan dan pemahaman peserta dengan kenaikan rata-rata dari 15,70 % menjadi 82,50 %. Hasil kegiatan pendampingan ini juga diperoleh produk dengan desain khusus, dalam kemasan 250 mL dan 450 mL serta kemasan botol 1000 mL. Berdasarkan hasil tersebut dapat disimpulkan bahwa kegiatan pelatihan pembuatan hand soap antiseptik merupakan kegiatan yang sangat berguna bagi masyarakat saat kondisi pandemi Covid-19 yang membutuhkan banyak hand soap.
RESPON DINAMIS TENSION LEG PLATFORM (TLP): STUDI KOMPARASI ANTARA PENGGUNAAN PONTON TELAPAK LINGKARAN DENGAN PONTON TELAPAK BUJUR SANGKAR Jamiatul Akmal
Machine : Jurnal Teknik Mesin Vol 8 No 1 (2022): Machine : Jurnal Teknik Mesin
Publisher : Jurusan Teknik Mesin Fakultas Teknik Universitas Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33019/jm.v8i1.2928

Abstract

Tension Leg Platform (TLP) is an offshore platform that is usually used for oil and gas exploration activities in the deep sea. One of the problems is the extra shaking of the TLP in response to extreme ocean waves. Under certain conditions, especially in the deep seas of the ocean, these shocks can cause various disturbances, and even have the potential to damage structures. In this article, it is proposed to use a cylindrical pontoon to obtain a more stable dynamic response, which will then be compared with a pontoon with a square section which is commonly used so far. The dynamic response of both models was recorded by ultrasonic sensor and video tracker. The measurement results are displayed in a non-dimensional form, which is commonly known as the Response Amplitude Operator (RAO), which is the ratio between the displacement of the TLP to the wavelength. From this research, it was found that TLP with cylindrical pontoon section has a relatively stable response when compared to TLP with square pontoon section.
Hydrodynamic forces on submerged floating tube: The effect of curvature radius and depth level Jamiatul Akmal; Asnawi Lubis; Ahmad Su'udi; Novri Tanti; Nurcahya Nugraha; Zaky Abyan Fahrain; Panji Firmanul Hakim
Kapal: Jurnal Ilmu Pengetahuan dan Teknologi Kelautan Vol 19, No 1 (2022): February
Publisher : Department of Naval Architecture - Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/kapal.v19i1.44019

Abstract

The discussion of hydrodynamic forces becomes an important issue in determining the dynamic behaviour of the Submerged Floating Tunnel Bridge (SFTB) structure. As stated in the Morison Equation, the hydrodynamic forces are affected by the kinematics of water particles, but up to this date, there are only a few discussions for curved tube applications. This paper discusses the effect of curvature radius and depth level on hydrodynamic forces to get the correction factor for a straight tube. Tubes with variations in radius curvature (R/L) and diameter (D) were installed in a wave pool with a depth level (z/d). The hydrodynamic forces were detected by a load cell sensor placed on a pedestal at the end of the specimen. The data from the load cell was processed by the data acquisition system and displayed on the monitor screen, showing that the z/d ratio and the R/L ratio both affect the hydrodynamic forces. A larger z/d ratio (deeper) results in smaller hydrodynamic forces, while a smaller R/L ratio (more curved) results in smaller hydrodynamic forces. A correction factor (C) has been determined to calculate the hydrodynamic force on a curved tube based on the Morison equation.
Rancang Bangun Mesin Cetak Centrifugal Casting untuk Pembuatan Pipa Komposit Geopolimer Jamiatul Akmal; Arisandi Arisandi; Ahmad Suudi; Asnawi Lubis; Novri Tanti
Jurnal Teknik Mesin Vol 15 No 1 (2022): Jurnal Teknik Mesin
Publisher : Politeknik Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30630/jtm.15.1.800

Abstract

In the field of materials engineering, various types of advanced materials have been found. This must also be accompanied by technological advances in the production process. Centrifugal casting is an effective method for casting cylindrical objects such as pipes and pressure vessels. In this research, a centrifugal casting machine is designed and made. The design process follows the steps proposed by Pahl and Beitz, starting from requirements identification, concept design, layout and analysis to the fabrication method. Furthermore, this machine was tested for casting geopolymer composite pipes. From the test results it is stated that this machine works well and can cast pipe samples at various speeds. Furthermore, the sample is cut into a three-point bending test specimen. From the test results obtained bending strength of about 50 MPa (1500 rpm tube rotation) and about 36 MPa (1200 rpm tube rotation). Thus, it is concluded that the higher the tube rotation, the higher the quality of the resulting product.
Submerged Floating Tunnel Bridge (SFTB): A Status Report and Evaluation of Technology Readiness Level (TRL) Nurcahya Nugraha; Jamiatul Akmal; Asnawi Lubis
Journal of Integrated and Advanced Engineering (JIAE) Vol 2, No 1 (2022)
Publisher : Asosiasi Staf Akademik Perguruan Tinggi Seluruh Indonesia (ASASI)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51662/jiae.v2i1.35

Abstract

One of the problems in archipelagic countries is the land transportation system that has not been integrated between islands. In a relatively wide strait and with a high level of depth, it is impossible to build a bridge. In this case, a submerged floating tunnel bridge/SFTB would be an effective choice. SFTB is an underwater tunnel transport route submerged between the seabed and the surface. Known as the "Archimedes Bridge", the basic principle is balancing buoyancy and tension in the mooring cables. Previous studies on SFTB are still in the form of theoretical concepts and ideas. Further research is needed in all relevant sub-topics to actualize the SFTB. This article reviews previous studies, which are grouped into three sub-topics : (1) materials and construction, (2) dynamic analysis, and (3) feasibility/sustainability studies. At the end of this article, a list of research topics that need further study is presented.
Co-Authors Agung Abadi Kiswandono Ahmad Su'udi Ahmad Su'udi Ahmad Su'udi Ahmad Suudi Ahmad Suudi Ahmad Suudi An Nisa Magnolia Arisandi Arisandi Asnawi Lubis Asnawi Lubis Asnawi Lubis Asnawi Lubis Buhani Buhani Destarius Mahardhika Dwiguna, Osvaldo Ostrava Fadhillah Nurul Aini Heri Satria Muhammad Rahardian Putra Murti, Adam Wisnu Ni Luh Gede Ratna Sari Novri Tanti Novri Tanti Novri Tanti Novri Tanti Novri Tanti Novri Tanti, Novri Nurcahya Nugraha Nurcahya Nugraha Nurhasanah Nurhasanah Nurhasanah Nurhasanah Nuryanto Nuryanto Panji Firmanul Hakim Prasetyo Budiyanto Rinawati Rinawati Suharso Suharso Zaky Abyan Fahrain Zulhendri Hasymi