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Asnawi Lubis
Universitas Lampung
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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.
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.
Identifikasi kinematika partikel air dan karakterisasi gelombang ombak dengan metode video tracker Jamiatul Akmal; An Nisa Magnolia; Ahmad Suudi; Novri Tanti; Asnawi Lubis
Jurnal Teknik Mesin Indonesia Vol. 18 No. 1 (2023): 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.v18i1.418

Abstract

As an archipelagic country, Indonesia has great potential for marine resources. This potential must be supported by theoretical studies as the basis for the development of marine technology. For this reason, in this study a laboratory scale wave medium was created as a medium for observing the kinematics of water particles and defining the equations of wave motion. Water particles are represented by buoy balls that are installed at various depth levels. The motion of the buoys is recorded with a video recorder and then converted into a displacement graph with a video tracker application. The wave generator is designed to get a variety of wave sizes and types. The wave generator moves back and forth and is connected to an eccentric rotor by a sliding crank mechanism. The eccentricity of the rotor can be varied, in this study it was determined that e1=3cm, e2=5cm and e3=8cm. From the test results it can be concluded that for e1 the type of wave that occurs is in accordance with the Airy Equation, while for e2 and e3 the waves are obtained in accordance with the Stokes Equation. In addition, it is also known that the displacement of water particle movement is maximum on the surface and decreases at deeper levels.
Media Pembangkit Gelombang Skala Laboratorium Jamiatul Akmal; Ahmad Suudi; Yoki Surya Grahita; Asnawi Lubis; Novri Tanti; Zulhendri Hasymi
Jurnal Teknik Mesin Vol 16 No 2 (2023): Jurnal Teknik Mesin
Publisher : Politeknik Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30630/jtm.16.2.1239

Abstract

In the design of offshore building structures, calculations are required by looking at the factors that occur in the ocean. A big factor that occurs is the disturbance force of waves which can disrupt the strength of the building structure to be created. For this reason, this research makes a wave generating media device on a laboratory scale. With this tool, efforts are also made to resemble the original wave, where the deeper it is, the smaller the strength of the wave formed. This effort is an implementation of the wave forms that occur in the open sea. The results of the design of a wave generating media device measuring 3690x830x940 mm. From wave observations and calculations, it was found that the wavelength was 0.5m and the amplitude was 0.01m. It was concluded that the type of wave characteristic produced by this tool was categorized as an airy wave.
Rancang Bangun Sistem Pengunci Pintu Rumah Menggunakan Remote nRF24l01+ Berbasis Mikrokontroler Suudi, Ahmad; Saputra, Anggi; Martinus, Martinus; Tanti, Novri; Lubis, Asnawi; Riszal, Akhmad
TURBO [Tulisan Riset Berbasis Online] Vol 12, No 2 (2023): TURBO: Jurnal Program Studi Teknik Mesin
Publisher : Universitas Muhammadiyah Metro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24127/trb.v12i2.2601

Abstract

Home door security currently still uses a manual system using conventional door locks.  The disadvantages of conventional house door locks include that the home owner must ensure that the house key is not owned by a stranger which causes the key to be easily duplicated, as well as the number of house break-ins that cause the security of the house door to be very insecure.  To overcome the problems that occur regarding the security of the house door, the authors created a microcontroller-based door lock system using the nRF24L01+ remote as access control for opening and closing door locks. This door lock system uses 3 microcontrollers, including NodeMCU ESP8266 as a remote. Arduino Uno as the door lock system control unit, as well as the additional NodeMCU ESP8266 microcontroller as a data logging unit.  The control unit is tasked with making decisions based on commands sent by the remote via radio frequency communication from the nRF24L01+ module.  The command sent by the remote is in the form of opening and closing the door lock which comes from the input button on the remote.  It also provides additional features in the form of data logging by providing input using a limit switch attached to the door. This research got the results, namely the success of the system that is able to respond in less than one second.  The fastest response time gets a value of 0.14 seconds, then the longest response speed gets a value of 0.565 seconds, and the stable response speed gets a value of 0.188 seconds
PENGUJIAN PROGRAM PREDIKSI KECEPATAN POROS ROTOR BERTINGKAT SECARA EKSPERIMENTAL Sembiring, Alexander; Lubis, Asnawi; Wahyudi, Retno
AUSTENIT Vol. 16 No. 2 (2024): AUSTENIT: October 2024
Publisher : Politeknik Negeri Sriwijaya, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.53893/austenit.v16i2.8513

Abstract

In the process of designing a rotor shaft system, there are aspects that need to be considered to produce a well-functioning rotor shaft system when it starts operating. Failures that occur in rotor shaft systems are generally caused by excessive vibrations in the system. This can be avoided by detecting the system's natural frequencies early on, as predicting its natural frequencies can also predict its critical rotational speeds. The critical rotational speeds of the system can be determined by solving its equations of motion using various methods. In this study, the equations of motion of the system were solved using the finite element method, where local matrix equations were determined according to the equations and then global matrix equations were obtained and solved using a direct method, employing the eigenvalues and eigenvectors of the system. A program was designed to predict the critical rotational speeds of the system. The program was implemented using the MATLAB programming language. The results of the program, when compared with laboratory test results, showed a difference of 1.23%-3.69%.
Maximum stress and deformation of coal flow breaker plate due to continuous loading Lubis, Asnawi; A. Hadi, Kiagus; Akmal, Jamiatul; Hasymi, Zulhendfri
Prosiding SNTTM Vol 22 No 1 (2024): SNTTM XXII Oktober 2024
Publisher : BKS-TM Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.71452/590781

Abstract

Vibrating screens are very important equipment in the coal mining and processing industry. One of the components of this vibrating screen is a flow breaker plate, which functions as a flow breaker for the coal bulk load before it falls on the vibrating screen. Due to the impact load of coal bulk, which works continuously, the plate often breaks in fatigue with a maximum stress and deformation greater than those if the load were worked statically. This paper presents the results of a finite element study on the maximum stress and deformation that occur in various materials used as coal flow impact load breaker plates at PT Bukit Asam Pelabuhan Tarahan, Bandar Lampung. The plate construction is modeled as beams with fixed ends. The length and height (as a beam) are 1500 and 200 mm, respectively, while the plate thickness (beam width) is analyzed to be 15 and 20 mm for each type of material. Four types of materials available at PT Bukit Asam, namely ST37, ST52, Hardock (HB400), and GS20 Mns, were analyzed for impact loads using ANSYS Explicit Dynamics. The results of the finite element analysis show that the ST37 material, with a thickness of 20 mm, experiences the smallest maximum stress compared to the other three types of material. Meanwhile, for deformation, the analysis results show that ST52 material with a thickness of 20 mm experiences the smallest maximum deflection compared to the three other types of material. 
Pentingnya Peran Permesinan dalam Pengembangan Produk Olahan Buah Pala di Desa Pesawaran Indah Hasymi, Zulhendri; Lubis, Asnawi; Suudi, Ahmad; Akmal, Jamiatul
Jurnal Pengabdian Kepada Masyarakat (JPKM) TABIKPUN Vol. 6 No. 1 (2025)
Publisher : Faculty of Mathematics and Natural Sciences - Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jpkmt.v6i1.218

Abstract

Buah pala (Myristica fragrans) di Desa Pesawaran Indah, Kabupaten Pesawaran, umumnya hanya dijual secara gelondongan, bahkan daging buah pala terkadang dianggap sebagai limbah. Pada masa lalu daging buah pala diolah menjadi manisan pala, namun tidak berlanjut. Agar potensi pala di Desa Pesawaran Indah ini dapat dimanfaatkan dengan lebih baik, maka perlu dilakukan kegiatan berupa penyuluhan. Kegiatan ini bertujuan untuk memotivasi masyarakat agar dapat memanfaatkan pala menjadi produk olahan yang jauh bernilai ekonomis. Khalayak sasaran kegiatan ini adalah anggota KWT Al-Hidayah dan perwakilan dusun serta mahasiswa Kuliah Kerja Nyata. Kegiatan penyuluhan pemanfaatan pala dilengkapi dengan video proses pengolahan pala baik secara tradisional maupun menggunakan teknologi permesinan. Kuesioner pre test dan post test kegiatan ini diisi oleh 15 peserta yang dipilih secara acak. Hasil kuesioner menunjukkan bahwa pengetahuan peserta dapat meningkatkan sekitar 56%, dari yang sebelumnya masih ragu-ragu menjadi paham akan pentingnya penggunaan teknologi mesin dalam pengembangan produk olahan buah pala setelah mengikuti kegiatan ini.
RANCANG BANGUN ALAT IMPACT TEST DENGAN METODE IZOD MENGGUNAKAN STANDAR ASTM E23 Erwin, Erwin; Lubis, Asnawi; Ansyori, Anang
Bhinneka Multidisiplin Journal Vol. 2 No. 5 (2025): Bhinneka Multidisiplin Journal
Publisher : Yayasan Education and Social Center

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.53067/bmj.v2i5.84

Abstract

An increasingly advanced era, the need for buildings is increasing, especially in the field of architecture that uses metal as its main material. However, all of that must be balanced with the feasibility of the design, before implementing the design, the material must be tested first. Impact testing is a test used to measure the resistance of a material to impact loads. Impact testing attempts to simulate the operating conditions of materials commonly found in transportation and construction equipment. Loads always occur suddenly, not slowly. For example, the change in a car bumper due to an accident or a ship hitting a coral reef while sailing at sea. This study aims to create an impact test tool using the izod method to measure impact energy and metal impact strength. The methodology in this study is a literature study, design, workmanship, and tool testing. The iron nako specimen with a length of 75 mm, a width of 10 mm and a height of 10 mm is then notched at a point 28 mm from the end of the specimen with a U notch to be carried out in the izod method impact test using the ASTM E23 standard, namely the pendulum impact tester at ambient temperature and low temperature and high temperature conditions. In the test of specimens at a temperature of 0°C, the impact energy value is 151.332 J, and the test of specimens at a temperature of 20°C, the impact energy is 160.007 J. While for ambient temperature or 30°C, the impact energy is 165.763 J. In the test of specimens at a high temperature of 45°C, the impact energy is 177.163 J, and the specimen at a temperature of 60°C, the impact energy is 188.365 J. In the impact test of the ASTM E23 izod method that has been carried out, the fracture of nako iron can become ductile if the temperature of the specimen is increased. It can be concluded that the higher the temperature, the more the specimen fracture tends to experience ductile fracture.
Co-Authors A. Hadi, Kiagus Ahmad Su'udi Ahmad Su'udi Ahmad Su'udi Ahmad Suudi Ahmad Suudi Ahmad Suudi Ahmad Suudi Ahmad Su’udi Alexander Sembiring An Nisa Magnolia Anang Ansyori anggi saputra Arisandi Arisandi Destarius Mahardhika Dewa Anom Pasmadi Erwin Erwin Hadi, Kiagus Abdul Hasymi, Zulhendfri Jamiatul Akmal Martinus, Martinus Muhammad Agus Muljanto Muhammad Rahardian Putra Murti, Adam Wisnu Novri Tanti Novri Tanti Novri Tanti Novri Tanti Novri Tanti Novri Tanti, Novri Nugraha, Nurcahya Nuryanto Nuryanto Panji Firmanul Hakim Riszal, Akhmad Wahyudi, Retno Yoki Surya Grahita Zaky Abyan Fahrain Zulhendri Hasymi