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Mesin
Published by Institut Teknologi Bandung
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Core Subject : Engineering,
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Articles 539 Documents
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Sifat Mekanik Komposit Polipropilena Berpenguat Serat Sansevieria Unidirectional Mardiyati, Mardiyati; Rizkiansyah, Raden Reza; Purnomo, Ikhsan
Mesin Vol 25, No 2 (2016)
Publisher : Mesin

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Abstract

Serat hayati merupakan bahan yang saat ini sedang banyak dikembangkan sebagai penguat material komposit bermatriks polimer. Penggunaan serat hayati sebagai penguat pada suatu komposit memiliki beberapa keunggulan dibandingkan serat sintetis, diantaranya yaitu lebih ramah lingkungan, dapat diperbaharui, murah, serta memiliki densitas yang relatif rendah. Lidah mertua (Sansevieria trifasciata) merupakan salah satu jenis tanaman yang umumnya digunakan sebagai tanaman hias yang banyak tumbuh di Indonesia. Serat dari tanaman ini pada dasarnya memiliki potensi untuk digunakan sebagai penguat pada komposit berpenguat serat hayati karena memiliki sifat mekanik yang cukup baik, namun masih belum banyak dipelajari dalam aplikasinya sebagai penguat komposit. Pada penelitian ini, dilakukan studi mengenai pembuatan komposit sansevieria/ polipropilena dengan menggunakan metode tekan panas dengan fraksi volume serat terukur 4.9%, 8.6% dan 13.5%. Kualitas dari komposit diuji melalui pengujian tarik yang mengacu kepada ASTM D-3039 dan pengujian densitas. Pada penelitian ini telah berhasil dilakukan pembuatan komposit yang berbahan dasar serat sansevieria unidirectional dengan matriks polipropilena. Berdasarkan pengujian void dan bahan penyusun komposit, nilai fraksi volume serat terukur lebih rendah dibandingkan dengan fraksi volume serat terhitung. Seiring peningkatan fraksi volume serat terukur dapat menurunkan fraksi volume void, meningkatkan densitas, kekuatan tarik serta kekakuan dari komposit sansevieria/PP. Kekuatan tarik dan kekakuan tertinggi dari komposit sansevieria/PP diperoleh pada komposit sansevieria/PP dengan fraksi volume serat terukur 13.5%, yakni sebesar 53.07 MPa dan 2841 MPa.  
PERHITUNGAN PERAMBATAN RETAK PADA LAP-JOINT DENGAN METODE FINITE ELEMENT ALTERNATING Legowo, Dibyo; Juarsa, Husen; P. H, Adirakhmantyo; Padmadinata, Utama H; Suharto, Djoko
Mesin Vol 15, No 2 (2000)
Publisher : Mesin

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Abstract

Metode finite element alternating (FEAM) merupakan salah satu metode untuk menentukan faktor intensitas tegangan pada kasus retak berganda. Metode ini merupakan gabungan dari metode finite element dan solusi analitis untuk kasus retak pada pelat dengan lebar tak berhingga, Penelitian yang dilakukan merupakan penelitian lanjutan yang diterapkan untuk kasus khusus yaitu sambungan susun (lap-joint) yang merupakan salah satu sambungan penting pada struktur pesawat terbang. Untuk itu pada penelitian ini metode finite element alternating dikembangkan untuk geometri pelat berlubang. Penelitian yang dilakukan meliputi pemeriksaan program FEAM pada kasus pelat dengan satu lubang, pelat dengan beberapa lubang dan sambungan susun (lap-joint) untuk menghitung faktor intensitas tegangan (K). Hasil perhitungan K, ini kemudian digunakan untuk perhitungan perambutan retak pada sambungan susun tersebut.
PEMBUATAN DAN PENGUJIAN ANEMOMETER KAWAT PANAS TEMPERATUR KONSTAN UNTUK PENGUKURAN KECEPATAN UDARA PADA ALIRAN SWIRLING Diasta, I N; Santoso, Arianto; Sutikno, Priyono; Dinata, Uyung G. S
Mesin Vol 13, No 2 (1998)
Publisher : Mesin

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Abstract

To overcome the difficulties in calibrating a hot wire anemometer the equation E2 = A+BU0.45, as the reference equation in making hot wire anemometer, was changed to U = (1/ B (E2-A))2.22 to produce linear calibration curve. To realize this idea then an electronic circuit was designed with IC AD 534 and AD 538 as the main components. IThe hot-wire anemometer was made based upon the above principles then used to measure velocity components of swirling flow, which has two components of velocity, i.e.: axial (normal) velocity and tangential velocity. In measurement of swirling flow the probe-X was used to measure axial velocity and tangential velocity simultaneously. Magnitude and direction of swirling flow were determined from those velocity components.
KAJI EKSPERIMENTAL SAMBUNGAN ADHESIF LAPIS TUNGGAL DAN GANDA AKIBAT PEMBEBANAN TARIK Suweca, I Wayan; Hernansjah, Hernansjah; Taufani, Soni
Mesin Vol 16, No 3 (2001)
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Abstract

This paper presents an experimental investigation of the single and double adhesively lap-bonding joint. The adhesive material used is Metalloam® grade III. The study was performed to investigate the influence of curing time on the shear strength of the bonding. The results show that the shear strength of the bonding joint increases with the curing time. The maximum shear strength was achieved after the curing time attaint 96 hours.
KARAKTERISTIK TERMAL SISTEM TRANSMISI HIDRAULIK Simanjuntak, Toman S; Suwono, Aryadi; Sularso, Sularso; Josito, H. M
Mesin Vol 2, No 4 (1983)
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Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (308.938 KB) | DOI: 10.5614/MESIN.1983.2.4.1

Abstract

Tulisan ini mengelengahkan hasil penelitian dari karakteristik termal sebuah sistem transmisi tenaga hidraulik. Pendekatan dan prosedur yang diterapkan untuk melaksanakan diuraikan, Hasil-hasil yang penting baik yang diperoleh dari pengkajian teori maupun eksperimen dibahas. Penelitian berhasil mengembangkan persamaan-persamaan dan prosedur perencanaan sistem transmisi hidraulik dari aspek termalnya. Persamaan-persamaan tersebut dipecahkan secara numerik dengan bantuan komputer dan diuji keandalannya dengan data eksperimen.
PERANCANGAN ALGORITMA PENJADWALAN PEMBUATAN CETAKAN SESUAI DENGAN DUE DATE JADWAL PELEBURAN LOGAM UNTUK MENDUKUNG KONSEP SISTEM PRODUKSI TERDISTRIBUSI MANDIRI ( STUDI KASUS SEKSI FOUNDRY PT. BANINUSA INDONESIA ) Martawirya, Yatna Yuwana; Arthaya, Bagus; Yanni, Yanni
Mesin Vol 17, No 3 (2002)
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Abstract

At this moment, manufacturing industries in Indonesia must have high flexibility that can quickly responds dynamic changes in production processes. Autonomous Distributed Manufacturing System (ADiMS) is one of the production system alternative that can increase system flexibility with ability to adapt dynamic changing condition in the system.ADiMS is a production system where productions elements are independent, which planning process and production control is distributed to each independent element. Each of production’s element has autonomy in running the monitoring, taking the decision, controlling, and communications functions with the other production’s elements. Because each of the production elements take the decision independently, there should be a coordination of decision making result so the conflict will not occur among independent production elements.In this research AdiMS concept is applied in Foundry section at PT. Baninusa Indonesia. The task is to make a sand mold producing schedule based on the schedule of melting of cast iron or cast steel so it can support cast’s order and filling the customer order. This research is done with the help of application program that specialized developed so it is hoped will make results a better scheduling of making sand mold casting.
Perancangan, pembuatan dan pengujian Sensor Sudut Cerdas (Intelligent Angle Sensor) Muljowidodo, Muljowidodo; Muhadi, Muhammad Nur
Mesin Vol 16, No 1 (2001)
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Abstract

Angle sensor has been used in many systems demanding angle information of moving object. Angle sensor reported here has no damping as well as filtering system, therefore vibration information inherently in the construction of sensor will be included in the measured data. Algorithm in the intelligent control system will calculate the angle value separated from any vibration data, and the results have been compared to the ideal value where no vibration occurs during measurement.
Sifat Mekanik Packaging Kertas Berbahan Dasar Selulosa Alga Cladophora Mardiyati, Mardiyati; Steven, Steven; Suratman, Rochim; Santosa, Sigit Puji
Mesin Vol 27, No 1 (2018)
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Abstract

Alga cladophora merupakan salah satu alga yang banyak tumbuh di pesisir pantai Indonesia. Alga cladophora memiliki kandungan selulosa yang cukup tinggi sehingga sangat berpotensi untuk dimanfaatkan sebagai bahan baku material packaging kertas. Tujuan dari penelitian ini adalah mempelajari sifat mekanik kertas yang berbahan dasar selulosa alga cladophora. Pada penelitian ini, selulosa alga cladophora diekstraksi melalui beberapa tahapan proses yang meliputi proses alkalisasi dan proses hidrolisis. Proses alkalisasi dilakukan dengan merefluks alga cladophora didalam larutan NaOH (1%, 5%, 10%, 15% dan 17.5%) pada temperatur 100 ? selama 2 jam. Proses hidrolisis dilakukan dengan merefluks alga cladophora hasil alkalisasi didalam larutan asam sulfat 1 M pada temperatur 100 ? selama 2 jam. Proses pembuatan kertas dilakukan dengan metode solution casting. Kandungan selulosa diukur dengan menggunakan metode Chesson-Datta. Sifat mekanik dari kertas selulosa alga cladophora diukur dengan pengujian tarik. Dari hasil pengukuran kandungan selulosa dapat disimpulkan bahwa selulosa yang diekstrasi dengan menggunakan larutan NaOH 17.5% memiliki tingkat kemurnian yang paling tinggi, yakni 94. 76%. Selulosa yang diekstraksi dengan menggunakan larutan NaOH 17.5% menghasilkan kertas dengan permukaan yang paling halus serta memiliki kekuatan tarik dan kekakuan yang paling tinggi dibandingkan dengan kertas lainnya yang dihasilkan dalam penelitian ini, yakni 57.68 MPa dan 10.12 GPa.
Numerical Study of Experiment Setup for Aluminum Foam Sandwich Construction Subjected to Blast Load Pratomo, Arief Nur; Santosa, Sigit Puji; Gunawan, Leonardo; Putra, Ichsan Setya
Mesin Vol 27, No 1 (2018)
Publisher : Mesin

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Abstract

In the designing an armored fighting vehicle (AFV), blastworthy construction to protect military personnel from landmines explosion is urgently needed. This is due to a large number of fatalities of army personnel in the state conflict zones. To achieve this blastworthy construction, the design of AFV floor structures needs to be able to sustain structural intrusion with lower dynamic acceleration against blast load. The blastworthy structures can be achieved through absorbing the blast impact load by using an aluminum foam sandwich (AFS) construction. During the design iteration process, a good correlation between numerical simulation and blast impact experiment is required. In this study, an experimental setup to assess the AFS construction for blast load performance evaluation was introduced. This study is started with an evaluation of jigs and fixtures structural strength, load cell structure requirement, and data acquisition to record maximum displacement, maximum acceleration, and reaction force in the load cells. From the evaluation, it was found that the jig and fixture structural configuration requires high load retention at the bolt joint location to avoid high stress concentration. For the load cell structure, it is recommended to place the load cell position in the pure axial stress direction so that there is no plastic deformation interference with the instrumentation. The data acquisitions will record the acceleration and reaction force of the AFS construction. The simulation results are also used to design the load cell and to select the accelerometer capability range. This study is expected to provide a robust experimental data during blast impact load testing of blastworthy AFS floor structure. 
ANALISIS BESAR KESALAHAN MAGNITUDE FUNGSI RESPON FREKUENSI HASIL PENGUJIAN DENGAN METODE EKSITASI KEJUT AKIBAT KETERBATASAN PANJANG WAKTU REKAM Partogi, Agusmian; Abidin, Zainal; Bagiasna, Komang
Mesin Vol 21, No 1 (2006)
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Abstract

This paper describes the mathematical analysis concerning the influence of time record length on the magnitude error of the Frequency Response Function (FRF) using impact hammer testing. In this paper, the value of damped natural frequency is assumed to be the same with the value of positive integer multiple of the frequency resolution in response spectrum. The mathematical analysis results an equation which can be used to calculate the error value of FRF magnitude due to the finite time record length. As an illustrative example, the simulated FRF using impact hammer testing on four S-DOF vibration system models is presented in this paper. The simulation is performed using a computer program which is constructed using MATLAB software. The simulation results show that the error of FRF magnitude obtained from the simulated testing is almost the same with the error value derived from theoritical equation.

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