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Mesin
Published by Institut Teknologi Bandung
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Articles 539 Documents
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TINJAUAN SINGKAT TEKNOLOGI PEMBUATAN RODAGIGI HYPOID Prakosa, Tri
Mesin Vol 9, No 1&2 (1990)
Publisher : Mesin

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Abstract

Rodagigi hypoid merupakan jenis roda gigi kerucut (bevel) yang sumbu pinionnya (driver) memiliki offset terhadap sumbu gearnya (drivennya). Teori yang rumit dan"informasi tentang pembuatannya yang hanya terpusat pada perusahaan tertentu, sehingga hanya pihak-pihak itulah yang mampu membuat roda gigi hypoid. Perkembangan teknologi mesin CNC serta kemajuan di bidang programming memberi dampak terhadap kemudahan teknologi pembuatan roda gigi hypoid, sehingga industri menengah bahkan rendahpun memiliki kesempatan untuk memproduksinya. Roda gigi hypoid banyak digunakan karena beberapa kelebihan dibandingkan dengan roda gigi kerucut lainnya. Unjuk kerja roda gigi tergantung pada kualitas geometri yang yang dihasilkan. Kualitas geometri yang baik dapat diperoleh apabila keseluruhan tahap proses pembuatan dikontrol secara baik. Tulisan ini menguraikan tentang proses pembuatan roda gigi hypoid yang dilakukan oleh The Gleason Works, Rochester, N.Y., USA, sebagai salah satu perusahaan penghasil mesin pembuat roda gigi. Negara lain penghasil mesin pembuat roda gigi adalah Swiss (Oerlikon), Jerman (Klingenberg), serta Jepang.
DEVELOPMENT OF AUTO-GENERATING AERODYNAMIC LOADS FOR WING-BOX FINITE ELEMENT MODEL BASED ON SCHRENK METHOD Zain, R; Pamungkas, I. R; Wafiqni, Wafiqni; Yusni, A
Mesin Vol 24, No 2 (2009)
Publisher : Mesin

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Abstract

This paper describes the development of computer application for computing the wing lift distribution and auto-locating each sectional lift force to the appropriate nodes of wing-box finite element model (FEM). In Catia-V5 environment, Visual Basic .Net is intensively utilized to access several Catia’s Component Object Models (COMs) by implementing several user interfaces for collecting flight data from user and for linking to the wing-box finite element model that already created in the previous work. The distribution of lift force is governed by Schrenk method, where the distribution is multiplied by limit load factor and safety factors in order to conform to the airworthiness requirement. The lift force is computed for each rib-space area and located on a point of quarter chord called a Handler. Correspondingly each upper wing surface of rib-space called Agent conducts as media to transform each lift force from a handler into their associated nodes of FEM. To demonstrate this work, a hypothetical N250 wing box structures is utilized for a case study. The result of this work is very useful to be utilized for wing design involving aerodynamic and structure analysis.
PENGARUH WAKTU AUSTENITISASI PADA PROSES PELARUTAN KARBIDA BAJA MANGAN AUSTENITIK Widyanto, Bambang; Sambas, Achmad
Mesin Vol 22, No 1 (2007)
Publisher : Mesin

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Abstract

Austenitic manganese steel is used for components which need good wear resistance and impact resistance. The application examples of austenitic manganese steel castings are in the mining industries such as rock crusher and dredge buckets, and in transportation industry, this material was used in railroad track work such as frog. However as-cast austenitic manganese steel is brittle with low toughness due to the presence of carbides. Hence, the as-cast austenitic manganese steel should be solution treated to dissolve the carbides into austenite phase, to improve its mechanical properties. Additionally, this research is enriched by using thickness parameter, to understand the influence of the dimension. The chemical composition in the casting process is in accordance with ASTM A 128 grade A. The solution treatment processes was done using a step heating procedure at temperature 575oC and 1050oC and determined heating time. Heating temperatures were determined based on Fe-Mn-C phase diagram and by the previous researches. Holding time was determined based on the literature, and heat transfer simulation result. The effects of the solution treatment were observed in the microstructure, grain size, and hardness of the specimens to obtain the optimal solution treatment that can be used. The objective of this research is to find the suitable heat treatment method in order to produce the desirable material properties and in this case, 160HB was obtained.
PREDIKSI TEKANAN UAP DAN VOLUME MOLAR SENYAWA HIDROKARBON DENGAN PERSAMAAN TINGKAT KEADAAN Ratnawati, Ratnawati; Suwono, Aryadi; Samudro, H.M
Mesin Vol 11, No 3 (1996)
Publisher : Mesin

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Abstract

Vapor pressures and saturated liquid molar volumes of hydrocarbons up to n-C16 were predicted using equations of states. The equations of states used were Redlich-Kwong (RK), Mohsen Nia et al.-Redlich-Kwong (MRK), Saave-Redlich-Kwong (SRK), and Peng-Robinson (PR). The calculated values were compared to the experimental data extracted from various sources. The results indicated that PR eos was superior among the others.
Development of a 3D Gait Measurement Protocol for Amputees Walking on Treadmill Mahyuddin, Andi Isra; Ferryanto, F; Herman, Indria; Mihradi, Sandro; Dirgantara, Tatacipta
Mesin Vol 26, No 1 (2017)
Publisher : Mesin

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1207.701 KB) | DOI: 10.5614/MESIN.2017.26.1.4

Abstract

Walking motion is actually a complex activity since it involves many body parts, especially the lower limb. Due to the needs for gait analysis in many medical applications, Biomechanics Research Team at ITB has developed an affordable optical motion analyzer to measure motions of subject walking over ground. However, the needs for multicycles gait data is better met by measuring subjects walking on treadmill. This paper discusses the modification of the developed motion analyzer to accommodate data acquisition of subject walking on treadmill, including those of transfemoral amputees. Seven markers, two 95 fps cameras, a dual-channel Camera Link Acquisition NI PCIe-1430 frame grabber, and a workstation are employed in the optical motion analyzer system. The speed displayed on the treadmill is evaluated. Additional equipment such as the modified hydraulic engine crane and the body harness are introduced to ensure the safety of amputees and avoid the risk of falling down while walking on the treadmill. The modified motion analyzer system is then used to obtain gait parameters of normal (37 males and 31 females) and three amputee subjects. The gait parameters of normal subjects in the treadmill walking shows that there is a decrease in the stride length and range of motion, and increase in the cadence due to walking adaptation. There are also phase shifting and increase in the range of motion for amputee subjects compared to the normal subjects which imply that there is an extra work done by the residual limb in doing walking movement and the amputee subjects try to balance their walking on the treadmill.
DESIGN AND TESTING OF COAXIAL ROTOR DUCTED FAN VTOL UAV Kartidjo, M; Nugroho, S. A; Jiniwangun, R. G
Mesin Vol 24, No 1 (2009)
Publisher : Mesin

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Abstract

In general aircraft are classified into two major categories: fixed wing and rotary wing aircraft which are commonly known as helicopters. The vertical take-off and landing (VTOL) aircraft is designed to be capable of both flying horizontally like a fixed wing airplane and also ascending and descending vertically and thus eliminates the need of a runway [1],[2],[3],[4]. At recently years, Ducted fan VTOL is most popular. The reason behind that fact is the efficiency of power on the maneuver. This paper presents the results of design and testing of coaxial rotor ducted fan VTOL UAV. Pitch and roll moment of this vehicle will controlled with 2 independence control surface that’s attached on the bottom of duct. The Ducted profile is applied to the system in order to improve the efficiency thrust at hovering state [3]. The goal of this design is to find optimized rotation speed rotor and distance between rotors. The value of rotation speed and distance between rotors could be simulated in Computational Fluid Dynamics (CFD) Analysis. The target of this simulation is to find some combination minimum yawing moment and maximum thrust at specifics distance between each rotor. In order to validate this simulation and analysis, we used dedicated platform that’s could sense thrust and roll, pitch, yaw moment.
SIMULASI PROSES PEMBAKARAN PADA MOTOR BAKAR TORAK DUA LANGKAH Soelaiman, T. A Fauzi; Bachrun, Rachmat K; Mangaranap, Arthur M; Arifin, Andry
Mesin Vol 13, No 1 (1998)
Publisher : Mesin

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Abstract

The combustion process in an intemal combustion engine must be known in detail to find out the dependence of its operating conditions on the engines performance. This paper discusses a computer program that simulates the combustion processes of a two-stroke engine. The simulation includes modelling the heat transfers from the cylinder and crankcase, modelling the heat releases for gasoline and diesel engines, modelling the gas properties, modelling the energy balance, and modelling the flow coefficients through the ports. The performance of the two-stroke engine can be obtained from the simulation. As a case study, a two stroke MK1 engine was simulated and the simulation results the maximum indicated power is 18.3 hp at 5500 rpm and the maximum indicated mean effective pressure (IMEP) is 4.2 bar at 5000 rpm.
Analisis Keselamatan Penumpang Train Set Akibat Efek Sekunder Tabrakan Budiwantoro, Bagus; Puja, IGN Wiratmaja; Kariem, Muhammad Agus; Sinuraya, Elias S.
Mesin Vol 25, No 1 (2016)
Publisher : Mesin

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (665.796 KB) | DOI: 10.5614/MESIN.2016.25.1.1

Abstract

Efek tabrakan kereta dapat dibagi atas dua kategori yaitu efek tabrakan primer (primary collision) dan efek tabrakan sekunder (secondary collision). Kedua efek tabrakan tersebut merupakan ancaman bagi keselamatan penumpang yang berada di dalam kendaraan. Paper ini terfokus pada keselamatan penumpang akibat efek sekunder tabrakan. Analisis tingkat keselamatan penumpang dilakukan dengan memanfaatkan data-data karakteristik perlambatan dan kecepatan selama terjadinya tabrakan. Selanjutnya diaplikasikan terhadap kriteria keselamatan yaitu Head Injury Criterion (HIC)/Severity Index (SI). Analisis keselamatan dan tingkat cedera penumpang dilakukan berdasarkan posisi, jarak rintang dan keberadaan modul penyerap energi impak. Penumpang pada baris 1 dan 2 mengalami perlambatan 74g dan 73g, sedangkan untuk baris selanjutnya, nilai perlambatan bervariasi antara 3g - 21g.  Jarak rintangan yang semakin dekat akan mengakibatkan penumpang tersebut mengalami tingkat cedera yang semakin tinggi. Variasi kecepatan, massa penumbuk, dimensi modul penyerap energi impak, akan mempengaruhi tingkat cedera penumpang.
KARAKTERISTIK PENGAYAK GETAR DENGAN SUMBER EKSITASI POROS EKSENTRIK Bur, M; Nazaruddin, Nazaruddin; Mahyuddin, A. I; Samudra, J
Mesin Vol 15, No 1 (2000)
Publisher : Mesin

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Abstract

Vibrating screen is an equipment used to seperate material according to its particle size. It is usually operated in combination with a crusher. A vibrating screen prototype has been developed. This prototype, called as “Pengayak Getar Semen Padang Prototipe—0l" (PGSP PRO-01), employs an eccentric shafi‘ to excite the screen. The prototipe was designed to obtain several experimental parameters such as deck elevation, eccentric shaft rotational speed, screen capacity,types of material and screen mesh, gradation of material and spring stiffness. The characteristics of vibrating screen and material sieved may be determined experimentally. In this study, the performance of PGSP PRO-01 is examined by using silica sand, with a bulk density (ρ) of 1.54ton/m3, and material gradation of 50% of the grains larger than 5 mm, 35 % between 2.5 - 5 mm and 15% are less than 2.5 mm in size. Assuming a 92% screen efliciency and a 0.32 m2 screening area, theoretical screen capacity of 7.5 ton-per-hour (tph) is obtained. Experimentally, optimum screening parameters obtained are 7.2tph capacity at 91.7% efliciency resulting from a 900 rpm speed of eccentric shafi and a 10° deck elevation.
PEMBUATAN BESI COR NODULAR DAN METODA OPTlMASlNYA Basuki, Arif; Suratman, Rochim; Surdia, Tata
Mesin Vol 5, No 1&2 (1986)
Publisher : Mesin

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Abstract

Besi Cor Nodular (BCN) yang juga dikenal dengan Besi Cor Ulet (ductile), karena sifat- sifatnya dewasa ini makin banyak dipakai dalam pembuatan komponen-komponen mesin.Suatu pengkajian yang membahas tentang keterkaitan antara proses pembuatan BCN yang memuat banyak variabel dengan metoda optimasinya sangat perlu dilakukan, guna mendapatkan suatu bentuk proses pembuatan BCN yang optimum baik ditinjau dari segi teknologi maupun ekonomi.Studi kasus yang dilakukan kali ini adalah pembahasan tentang Metoda Optimisasi Teknologis dengan parameter Komposisi Kimia Base Material yang digunakan dalam proses pembuatan BCN.

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