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Djoko Suharto
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Mechanical Engineering

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KONSTRUKSI DAN KARAKTERISTIK KOPLING SERBUK Franciskus Ginting; Halim Abdurrachim; Djoko Suharto
Mesin Vol. 6 No. 1&2 (1987)
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Abstract

Kopling serbuk merupakan jenis kopling yang relatif masih baru pemakaiannya. Berbeda dengan jenis kopling lainnya. Kopling ini bekerja berdasarkan gaya inersia. Uniuk dapat lebih mengenal kopling serbuk berikut ini akan dibahas berturut "“ turut tentang deskripsi prinsip kerja, konstruksi sebenarnya dan karakteristiknya. Tulisan ini merupakan sari dari pengujian kopling serbuk Sumitomo type K di Jurusan Mesin ITB.
PENGUKURAN FAKTOR INTENSITAS TEGANGAN DENGAN MENGGUNAKAN STRAIN GAGE Djoko Suharto; Nanang Nazaruddin
Mesin Vol. 10 No. 1&2 (1994)
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Penentuan faktor intensitas tegangan dapat dilakukan dengan beberapa metoda, antara lain metoda analitik, numerik maupun eksperimental. Dalam penelitian ini dilakukan percobaan penggunaan strain gage tunggal (single strain gage) untuk pengukuran faktor intensitas tegangan, KI, clan kelangguhan inisiasi relak, KIq Dari penelitian ini diperoleh cara untuk menentukan orientasi, lokasi dan ukuran strain gage yang menjadi dasar penelitian lanjutan dalam penentuan faktor intensitas legangan pada fenomcna retak oepat (fast-fracture) dan retak lelah.
TINJAUAN TENTANG FENOMENA PERAMBATAN RETAK DINAMIK Husnaini Husnaini; Djoko Suharto
Mesin Vol. 11 No. 1 (1996)
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Abstract

Fenomena retak lelah dan retak dengan beban kuasistatik sudah rnenjadi konsep yang mapan dan telah digunakan dalam perhitungan rekayasa, Sebaliknya, fenomena retak cepat (fastfracture) masih belum banyak diketahui dan merupakan bidang penelilian baru. Tulisan ini merupakan rangkuman dari penelitian-penelitian dibidang ini. Tujuannya adalah membuat suatu pembahasan yang sistemalik sehingga konsep dan parameter-parameter retak cepat ini dengan mudah dapat dimengerti.
PERHITUNGAN PERAMBATAN RETAK PADA LAP-JOINT DENGAN METODE FINITE ELEMENT ALTERNATING Dibyo Legowo; Husen Juarsa; Adirakhmantyo P. H; Utama H Padmadinata; Djoko Suharto
Mesin Vol. 15 No. 2 (2000)
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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.
PERANCANGAN MEKANISME MOTOR STIRLING BERKAPASITAS 1 kW Toto Hardianto; Djoko Suharto; Tatacipta Dirgantara
Mesin Vol. 16 No. 2 (2001)
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Abstract

The Stirling engine is an external combustion engine for converting the thermal energy into mechanical energy. This engine uses a Stirling cycle, which theoretically could have high thermal efficiency, which is as high as a Carnot cycle operating at a similar condition.This paper deals with a design process of Stirling engine's mechanism stressing on the kinematics and dynamics aspects. Thermodynamics and geometry parameters are the inputs required for designing the Stirling engine's mechanism. Material aspect has not been included in the design. The main parameters analyzed are: engine's rotational speed, working temperature, cylinder's pressure, inertial forces and power output.The results of the design are useful to give an overall picture of the main dimensions of a Stirling engine. Detail calculations are still needed for more advanced design.
KAJI KOMPUTASIONAL PENGARUH BEBAN DAN KEAUSAN TERHADAP KEKAKUAN BANTALAN ROL Carolus Bintoro; Komang Bagiasna; Djoko Suharto; Zainal Abidin
Mesin Vol. 19 No. 2 (2004)
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Abstract

This paper explores the study of numerical determination of roller bearing stiffness as a result of wear increment by using contact Hertzian method. This study is part of the research on the determination of roller bearing vibration response as a result of wear increment. In this paper, wear is assumed as diametral clearance, Cd, and force work in radial direction. Computational method shows that increasing wear causes the decrease of stiffness. The relationship between deflection and stiffness, radial load and stiffness as a function of Cd can be determined.
CRACK DETECTION USING OPERATING DEFLECTION SHAPE Djoko Suharto; Komang Bagiasna; Zainal Abidin
Mesin Vol. 21 No. 1 (2006)
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This research presents development of vibration-based crack detection method using operating deflection shape (ODS) analysis from data measured by a Laser Doppler Vibrometer (LDV). Two types of work are conducted in this research. The first work is a numerical study, while the second work is an experimental study to verify the proposed method. In the numerical study, two types of specimen are used to simulate 2-Dimensional and 3-Dimensional problems using NASTRAN code. For the 2-Dimensional model, beams with two types of crack are tested, namely center and edge cracks. For the 3-Dimensional model, a plate specimen is tested. The length of the cracks and their locations are used as parameters to observe the ability of the proposed method to detect the existence and the location of the cracks. The results of numerical study show that the existence of cracks can be detected by using the natural frequency drops and the location of the cracks can be pinpointed by using the proposed S.Sd.D.Ms method (Square of the Second Derivative of the Deviation of the Mode Shape). In order to test the reliability of the proposed method, an experimental study is required. In this experimental study, FRF ODS measurements are conducted to derive the mode shape. Three types of specimen are measured, namely intact beam, center cracked beam, multiple center cracked beam and multiple edge cracked beam. The results of experimental study confirm that the proposed method can be used to detect the location of the cracks.
ANALISA TEGANGAN EKSPERIMENTAL DENGAN METODA FOTOELASTISITAS Andi Isra Mahyuddin; Refrizal Boestaman; Djoko Suharto
Mesin Vol. 3 No. 4 (1984)
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Abstract

Analisa tegangan dengan metode fotoelastisitas tembus cahaya dua diemsi adalah salah satu metoda optik yang digunakan dalam yang akan diuji dibuat modelnya dari bahan polimer tembus cahata. Model kemudian diletakkan pada perangkan pengujian dan dibebani serupa dengan pembebanan prototip. Hasil pengujian berupa pola garis isokromatik yang merupakan tempat kedudukan titik dengan selisih tegangan utama yang sama, dan pola garis isoklinik yang merupakan tempat kedudukan titik dengan arah tegangan utama yang sama. Data orde isokromatik dan parameter isoklinik digunakan untuk menentukan distribusi tegangan.
ANALISIS KESALAHAN FUNGSI RESPON FREKUENSI AKIBAT KETERBATASAN WAKTU REKAM PADA PENGUJIAN GETARAN DENGAN EKSITASI IMPAK KASUS DOMAIN WAKTU KONTINU Noval Lilansa; Zainal Abidin; Djoko Suharto
Mesin Vol. 23 No. 1 (2008)
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This paper derives mathematical equation describing the relation between errors in FRF due to limited record time length, record time and the time constant of a vibration system modelled by the I- dof vibration system with viscious damping. It is assumed in derivation of the equations that both impact excitation as well as response signals are not contaminated by noises. Moreover, the impact excitation is assumed to be a delta Dirac function. Consequently, the spectrum of the excitation is constant for all frequencies. The derived mathematical equations results show that the FRF error is a complex function so that is can be expressed by the magnitude anf phase functions. The magnitude of FRF error represent the maximum possible error occuring in the FRF magnitude. The maximum possible error occuring in the FRF magnitude at fn is influenced by parameters, such as record time and time constant of the structures. This maximum possible error shows an exponentially decreasing nature as the ratio of these parameters increases. Based on the derived equation, a recording of the response signal within three times of the system time constant results in the maximum possible error at fn in the FRF magnitude in the order of 5% of the theoritical FRF magnitude. Such recording can be performed if the peak amplitude of the response signal ceases to about 5% of the initial peak amplitude at the end of the record time for between 0.001 and 0,1.
Co-Authors Abd. Rasyid Syamsuri Adirakhmantyo P. H Bintoro, Carolus Dibyo Legowo Franciskus Ginting Halim Abdurrachim Hardianto, Toto Husen Juarsa Husnaini Husnaini Komang Bagiasna Nanang Nazaruddin Refrizal Boestaman Tatacipta Dirgantara, Tatacipta Utama H Padmadinata Zainal Abidin