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All Journal SINTEK JURNAL: Jurnal Ilmiah Teknik Mesin JMPM (Jurnal Material dan Proses Manufaktur) Turbo : Jurnal Program Studi Teknik Mesin Otopro AutoMech : Jurnal Teknik Mesin Qomaruna
Lostari, Aini
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Religion Aerospace Engineering Automotive Engineering Control & Systems Engineering Education Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Physics Social Sciences Other

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Optimization of Tambourine Kecer Punching Machine with Two Axis Movement System using Trimmer Machine to Improve Efficiency and Product Quality Lostari, Aini; Rian, Novi Indah; Amal, Fairus Ikhlasul
SINTEK JURNAL: Jurnal Ilmiah Teknik Mesin Vol 17, No 2 (2023): SINTEK JURNAL
Publisher : Universitas Muhammadiyah Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24853/sintek.17.2.151-160

Abstract

Indonesian traditional arts, such as tambourine art, have become an inseparable part of cultural heritage. In Kaliwot Village Bungah Gresik, the process of making tambourines still relies on manual methods, especially at the stage of punching the kencer with a hand saw. As a result, the tambourine produced has a rough and uncomfortable surface. This research aims to improve the efficiency and quality of tambourine production through the design of a kecer punching machine using a trimmer machine. The experimental research involved designing, manufacturing, and testing the trimmer machine, focusing on the timing of tambourine kencer punching. The types of wood used include mango, jackfruit, and mahogany. The results included a drive engine power of 0.35 kW, a plan power of 0.45 kW, and variations in motor torque: mahogany 0.0197 Nm, jackfruit 0.0215 Nm, mango 0.0184 Nm. The average hollowing time ranges from 9.42 to 13.31 minutes, with a daily production capacity of 35-42 tambourine seeds, depending on the type of wood. Analysis of motor torque showed that higher motor revolutions increased torque during feeding, potentially affecting wood hardness. The conclusion of the study emphasizes that the use of a trimmer machine can increase the efficiency and production capacity of tambourines, making a positive contribution to the craftsmen in Kaliwot Village as well as the preservation of tambourine art as a whole.
Studi Eksperimental Pengaruh Variasi Jarak Gap (G/D) pada Silinder Sirkular yang Tersusun secara Tandem terhadap Karakteristik Aliran Hanafi, Muhammad Khamdan; Riani, Novi Indah; Lostari, Aini; Hartono, R. Yudi
AutoMech : Jurnal Teknik Mesin Vol 3, No 02 (2023): Nopember
Publisher : Universitas Muhammadiyah Ponorogo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24269/jtm.v3i02.8053

Abstract

Aliran melintasi suatu bluff body salah satunya adalah bentuk silinder silkular yang banyak dijumpai dalam aplikasi engineering. Ketika melintasi suatu susunan silinder maka aliran tersebut akan membentuk pola (pattern) tertentu hal ini berdampak terhadap karakteristik aerodinamika dari silinder didalam susunan tersebut. Saat melintasi bodi aliran akan membentuk suatu pola aliran (flow pattern) yang sesuai dengan geometri kontur bodi dan juga menimbulkan gaya – gaya aerodinamika,untuk mengetahui tekanan aliran pada silinder silkular secara tandem. Penambahan pengganggu yang diletakkan di depan silinder sirkular bertujuan untuk mempercepat aliran dari laminar ke turbulen sehingga separasi aliran bisa ditunda lebih lambat sehingga pressure drag yang dihasilkan lebih kecil Metode penelitian yang digunakan adalah eksperimental dengan menggunakan dua buah silinder sirkular disusun secara tandem berdiameter (D) 25 mm dengan variasi G/D 0, 1, 2, 3 dan dua buah bodi pengganggu berbentuk square di depan masing-masing silinder berdimensi 4 mm. Posisi sudut pengganggu konstan sebesar 30o dan jarak gap 0,4 mm. Bilangan Reynolds berdasarkan silinder yang digunakan yaitu 2,3x104. Penelitian ini bertujuan untuk mendapatkan distribusi koefisien tekanan (Cp) koefisien drag pressure (Cdp) dan velocity profile dibelakang benda uji. Hasil menunjukkan bahwa yang terbaik pada variasi G/D 2 dengan nilai 0.22137 pada silinder upstream.
The Effect of Adding a Square Disturbance on the Flow Characteristics across Circular Cylinders Arranged in Tandem Riani, Novi Indah; Lostari, Aini; Ulum, Miftahul; Hakim, Ainul
JMPM (Jurnal Material dan Proses Manufaktur) Vol 8, No 1 (2024): Juni
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/jmpm.v8i1.21898

Abstract

Circular cylinder is one form of bluff body that is often used in engineering and industrial applications. The addition of a square placed in front of the circular cylinder aims to accelerate the flow from laminar to turbulent so that flow separation can be delayed more slowly so that the resulting pressure drag is smaller. The research method used was experimental using two circular cylinders arranged in tandem with a diameter (D) of 25 mm and variations in the distance between cylinders (L/D) 2;2,5;3;3,5;4 and two square-shaped square bodies (SDB) in front of each cylinder with dimensions of 4 mm. Position of SDB angle is 30o and the gap distance is 0.4 mm. The Reynolds number used is 2.3x104. This study aims to obtain the distribution of pressure coefficient (CP), drag pressure coefficient (CDP) and velocity profile behind the test specimen. The results showed that the addition of two square-shaped square bodies on each cylinder can reduce the drag force on the cylinder which causes a difference in values, where the largest pressure coefficient value occurs at a distance of L/D 4 with a value of -1.073 and the lowest value of drag pressure coefficient (CDP) at a distance of L/D 2 on the upstream cylinder with a value of 0.0786. While the downstream cylinder is located at a distance of L/D 3 with a value of -0.079 and the lowest speed value is located in the variation of L/D 4 with a value of 9.52 m/s.
PEMODELAN MESIN DIESEL DUAL FUEL (DDF) MENGGUNAKAN BAHAN BAKAR BIODIESEL DAN GAS HIDROGEN Winangun, Kuntang; Lostari, Aini; Riani, Novi Indah
TURBO [Tulisan Riset Berbasis Online] Vol 13, No 2 (2024): TURBO: Jurnal Program Studi Teknik Mesin
Publisher : Universitas Muhammadiyah Metro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24127/trb.v13i2.3750

Abstract

Vehicle exhaust emissions are the second largest cause of pollution after industry. Therefore, the government is targeting net zero emissions by 2060. One way to reduce fuel consumption is to use biodiesel. However, the use of biodiesel still has many negative impacts on vehicle performance, namely decreased engine performance. One way to reduce exhaust emissions without reducing engine performance is by adding hydrogen gas. This study was conducted with a simulation to determine the phenomena that occur in the combustion chamber of a single-cylinder diesel engine including hot cylinder pressure, the impact of combustion on exhaust emissions. The stages in this study consist of pre-processing, processing and post-processing. The results of this study indicate that the addition of hydrogen gas can increase the heat in the combustion chamber, the impact of increased heat is an increase in cylinder pressure, combustion chamber temperature, NO emissions, and CO emissions. While HC and soot emissions decreased with the addition of hydrogen gas to biodiesel fuel.
Optimasi Filter Bandpass Aktif untuk Sinyal Lemah Menggunakan Quantum Particle Swarm Optimization pada Studi Kasus Spektral Daya Sinyal Electroencephalogram Pramartaningthyas, Ellys Kumala; Lostari, Aini
Jurnal Studi Multidisiplin Qomaruna Vol 1 No 2 (2024): 2024
Publisher : Lembaga Penelitian dan Pengabdian Masyarakat (LPPM), Universitas Qomaruddin, Gresik, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62048/qjms.v1i2.46

Abstract

This research focuses on using Quantum Particle Swarm Optimization to optimize active bandpass filters for weak signals. Electroencephalograph signal data obtained from other researchers was used as a case study in this research. This Electroencephalogram signal data, consisting of 1280 signal amplitudes with a sampling frequency of 256 Hz, was characterized before being fed into Quantum Particle Swarm Optimization for optimization. The optimization goal of Quantum Particle Swarm Optimization is to achieve a signal frequency range with a maximum average power value. For bandpass filter design, the frequency range obtained from Quantum Particle Swarm Optimization is used as a reference. The frequency range of 9.9 Hz to 13 Hz and 15.99 Hz to 30 Hz provides optimal conditions. The filter design is based on the frequency range of optimization results and component values R1, R2, and R3 respectively 5.1M?, 10.2 M?, and 1M? with C1=C2=0.01?F for frequencies 9.9 Hz to 13 Hz, and a value of 1 .2M?, 2.4 M?, and 1M? each with C1=C2=0.01?F for frequencies 15.99 Hz to 30 Hz.
PENGARUH TEMPERATUR PEMANASAN DAN MEDIA PENDINGINAN PADA PROSES FLAME HARDENING TERHADAP NILAI KEKERASAN PADA BAJA S45C Machfuroh, Talifatim; Lostari, Aini; Ulum, Miftahul; Pramartaningthyas, Ellys Kumala
Otopro Vol 20 No 1 Nov 2024
Publisher : Universitas Negeri Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26740/otopro.v20n1.p1-6

Abstract

Sprocket is one of the main components in two-wheeled vehicles that transfer the rotary force from the engine to the rear wheels of the motorcycle. Because of this main function, the sprocket wears out faster due to friction between the chain and the sprocket. Therefore, a heat treatment process is needed to improve the mechanical properties of steel to make it more resistant to friction. Based on this background, this research focuses on the effect of temperature and cooling media on the hardness level of the material that receiving heat treatment in the form of flame hardening. The material used is S45C steel. The heat treatment process is carried out on steel with heating temperatures of 750º C and 850º C. After being heated, the steel will be quenched quickly with cooling media in the form of fresh water and turalic oil 48 ISO VG 46. Next, the hardness analysis process is carried out on the test object. From the results of the hardness test, it was found that the highest average hardness value was produced by the test object which underwent a flame hardening process at a temperature of 850 oC with fresh water cooling medium, which was 335.333 HB. Fresh water cooling media tends to produce higher hardness values ​​than turalic oil. This is because the cooling rate of fresh water is faster than oil.
The Effect of Adding a Square Disturbance on the Flow Characteristics across Circular Cylinders Arranged in Tandem Riani, Novi Indah; Lostari, Aini; Ulum, Miftahul; Hakim, Ainul
JMPM (Jurnal Material dan Proses Manufaktur) Vol. 8 No. 1 (2024): Juni
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/jmpm.v8i1.21898

Abstract

Circular cylinder is one form of bluff body that is often used in engineering and industrial applications. The addition of a square placed in front of the circular cylinder aims to accelerate the flow from laminar to turbulent so that flow separation can be delayed more slowly so that the resulting pressure drag is smaller. The research method used was experimental using two circular cylinders arranged in tandem with a diameter (D) of 25 mm and variations in the distance between cylinders (L/D) 2;2,5;3;3,5;4 and two square-shaped square bodies (SDB) in front of each cylinder with dimensions of 4 mm. Position of SDB angle is 30o and the gap distance is 0.4 mm. The Reynolds number used is 2.3x104. This study aims to obtain the distribution of pressure coefficient (CP), drag pressure coefficient (CDP) and velocity profile behind the test specimen. The results showed that the addition of two square-shaped square bodies on each cylinder can reduce the drag force on the cylinder which causes a difference in values, where the largest pressure coefficient value occurs at a distance of L/D 4 with a value of -1.073 and the lowest value of drag pressure coefficient (CDP) at a distance of L/D 2 on the upstream cylinder with a value of 0.0786. While the downstream cylinder is located at a distance of L/D 3 with a value of -0.079 and the lowest speed value is located in the variation of L/D 4 with a value of 9.52 m/s.
MODELING AND VIBRATION RESPONSE ANALYSIS OF PELLET MACHINE GRINDER AND GEARBOX Lostari, Aini; Susastro, Susastro; Machfuroh, Talifatim
SINTEK JURNAL: Jurnal Ilmiah Teknik Mesin Vol. 14 No. 2 (2020): SINTEK JURNAL
Publisher : Universitas Muhammadiyah Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24853/sintek.14.2.99-106

Abstract

Pellet machine is a machine used to print feed in the form of pellets. In this machine, if it operates, it can experience excessive vibration and the force acting on the machine is close to its natural frequency and can cause damage, so it needs to be reduced. In this study, the objective of this research is to model and simulate vibrations in the gearbox and grinder to determine the results of the displacement and acceleration vibration responses on the pellet machine. In this study, an electric motor is used as a source of rotation and an input clutch as a connection between the shaft of the electric motor and the gearbox as a transmission to reduce the speed of the electric motor, where the rotation produced by the electric motor contains vibrations, the output coupling is the connecting shaft between the gearbox shaft and the shaft grinder and miller as a tool used to print pellets. From the existing physical form, mathematical equations and simulation blocks are constructed. In this research, it is found that the vibration response generated from the gearbox and grinder can be modeled with the x and z axes as the center of the system. The higher the vibration response, the higher the given frequency, the greater the amplitude and rms of the displacement and acceleration responses in each part, namely the motor, clutch in, gearbox gearbox, coupling out, and grinder will be greater. The result of displacement vibration response yields an rms of 1.956. The worm gear in the gearbox produces a displacement vibration of 1.0585 m and an acceleration of 6.8485 m/s2. The mill produces a displacement vibration of 1.0891 m and an acceleration of 5.1095 m/s2.
PENGARUH PENDINGINAN UDARA BEBAS, AIR, OLI, DAN AIR GARAM TERHADAP MATERIAL BAJA SUP 9 DENGAN PERLAKUAN PANAS Kulsum, Umi Kulsum,; Lostari, Aini; Sugiono, Didik; Hartono, R. Yudi
AutoMech : Jurnal Teknik Mesin Vol 5, No 01 (2025): Mei
Publisher : Universitas Muhammadiyah Ponorogo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24269/jtm.v5i01.11820

Abstract

Perlakuan panas (heat treatment) didefinisikan sebagai kombinasi operasi pemanasan dan pendinginan yang terkontrol dalam keadaan padat untuk mendapatkan sifat - sifat tertentu pada baja/logam atau paduan. Salah satu metode perlakuan panas tersebut dengan proses quenching, dan normalizing. Proses ini dilakukan pada temperatur austenite (8500C) dan dilanjutkan holding time selama 120 menit kemudian didinginkan dengan air, air garam, oli dan udara bebas. Hasil pengujian memperlihatkan bahwa nilai kekerasan optimum adalah 501-528 BHN setelah quenching pada media pendingin air garam dan air, membentuk struktur mikro diantaranya ferrit, martensite, simentit, pearlite dan bainite. Dan struktur yang banyak terbentuk dari nilai kekerasan paling optimum adalah martensite. Perubahan struktur mikro yang terjadi dari autensite ke martensite.Dari penelitian ini disimpulkan bahwa proses quenching dan normalizing dapat merubah nilai kekerasan. Sementara perubahan struktur mikro terjadi karena proses holding time selama 120 menit, dan perubahan nilai kekerasan yang signifikan terjadi adalah dengan quenching air dan air garam.
Co-Authors Amal, Fairus Ikhlasul Ellys Kumala Pramartaningthyas, Ellys Kumala Hakim, Ainul Hanafi, Muhammad Khamdan Hartono, R. Yudi Kulsum, Umi Kulsum, KUNTANG WINANGUN Miftahul Ulum Miftahul Ulum Rian, Novi Indah Riani, Novi Indah Sugiono, Didik Susastro, Susastro Talifatim Machfuroh, Talifatim