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All Journal International Journal of Advances in Applied Sciences International Journal of Renewable Energy Development Rotasi JURNAL TEKNIK MESIN Jurnal Rekayasa Mesin Mesin Jurnal Teknik Mesin Indonesia International Journal of Sustainable Transportation Technology Jurnal Material Teknologi Proses: Warta Kemajuan Bidang Material Teknik Teknologi Proses Eksergi: Jurnal Teknik Energi Prosiding Simposium Nasional Rekayasa Aplikasi Perancangan dan Industri
Ojo Kurdi
Departemen Teknik Mesin, Fakultas Teknik, Universitas Diponegoro
Aerospace Engineering Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Control & Systems Engineering Earth & Planetary Sciences Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mathematics Mechanical Engineering Physics Transportation

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Experimental Studies of Interaction Forces Affect the Position of Vertical Plates on Oscillating Heave Plates with Cylindrical Bodies in Regular Waves Hadi, Eko Sasmito; Iqbal, Muhammad; Wibawa, Ari; Kurdi, Ojo; Karnoto, Karnoto
International Journal of Renewable Energy Development Vol 9, No 1 (2020): February 2020
Publisher : Center of Biomass & Renewable Energy, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/ijred.9.1.77-84

Abstract

This paper discusses an experimental study of a wave energy converter (WEC) without using reaction from the seabed. The WEC uses buoys and heave plates, which can react to their self-reacting. The interaction force between heave plates and buoys can absorb energy from ocean waves better. The heave plate model affects the output of energy produced. It is presented in this study with variations in the position of upright plates. The research aims to measure the influence of the place of the addition of vertical plates into heave plates on the WEC on the hydrodynamic performance (coefficient of mass increase, drag coefficient, and KC value) and the interaction of the force it produces with the buoy on regular waves. The conclusion is the vertical plate position makes the coefficient of mass added Ca increase with an increasing amount of KC, and an almost linear relationship was observed between them. As the frequency increases, the value of C increases slightly, but it is not clear. Thus, the oscillating frequency has little effect on the mass coefficient of added heave plates with vertical plates. Thus, the change in the vertical plate position has only a powerful effect on KC < 0.75. ©2020. CBIORE-IJRED. All rights reserved
Analisa Statik dan Optimasi Size Chassis Bus Medium dengan Metode Elemen Hingga Kurdi, Ojo
ROTASI Vol 22, No 4 (2020): VOLUME 22, NOMOR 4, OKTOBER 2020
Publisher : Departemen Teknik Mesin, Fakultas Teknik, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/rotasi.22.4.272-281

Abstract

Chassis is the main component in the bus. In chassis, various types of failures occur due to static or dynamic loading conditions. In this study, the characteristics of static loads were analyzed using the FE method, and after analysis, continued with size optimization. Analysis is done to get stress and displacement with the condition of analysis in the form of two bumped wheels. After the analysis is done, the next step is to look for a factor of safety from the stress of the results of analysis. Stress and displacement analysis results, are then used to determine the constraints used in the optimization process on the chassis. Optimization is done to get the most optimum thickness on the chassis, displacement, and stress. Then compare the safety factors of all data analysis and optimization results, to get the best chassis structure.
Perancangan Foldable Wall-Mounted Workbench Untuk Memudahkan Pekerjaan Tukang Kayu Kurdi, Ojo
ROTASI Vol 23, No 2 (2021): VOLUME 23, NOMOR 2, APRIL 2021
Publisher : Departemen Teknik Mesin, Fakultas Teknik, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/rotasi.23.2.29-35

Abstract

Workbench is a device that supports all the projecst of carpenter.  Good workbench have to help the Carpenter completed their jobs effectively.  Standard workbench has the limitation and it can not help carpenter perfectly.  Therefore, it is necessary to redesign the standard workbench in order to enhance its performance.  The objective of this aper is to design the workbench that efficient for the small rooms. The design process used the systematic approach where all the stages are related and continuously each others.  The first stage of design process is identification problem, continued by the conseptual design, making the decision matrix for the entire alterantive models and the last step is evaluation.  The result of the process is the final design that has these criteria, frame-mounted hinge, square hollow steel frame, support components with door mechanism, face vise with large diameter handle.  The model has the highest mark compred to others alternative models.  Stress analysis of finite element simulation result also shows that the model is safe and it can withstand all the loads during the operation
Development of Conceptual Design for Electric Bus Body Structure Using Simple Structural Surface Method Haryanto, Ismoyo; Widodo, Achmad; Satya, Ibrahim; Haryadi, Gunawan; Kurdi, Ojo; Budiman, Bentang; Santosa, Sigit
http://dx.doi.org/10.31427/IJSTT.2021.4.1.3
Publisher : Unijourn Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

An optimum design for a vehicle structure is always desired because the structure can significantly affect the vehicle's performance. However, some complex iterations are usually involved in the designing process. The objective of the present study is to implement the Simple Structural Surfaces (SSS) method for analyzing electric bus body structure that can reduce complexity in the stage of conceptual design. The SSS method model the vehicle structure as several planar sheets and determine the forces in each sheet. Implementing the SSS method at the early stage of the vehicle's development can minimize the number of parameter changes needed during the late stage of development. The results showed that compared with the results obtained from FEM, the SSS method gave the maximum stress value on the chassis in good accordance. Yet, the downside of using this method is that determining the deflections in the structure becomes a little bit complicated. Successfully implementing this strategy can reduce the time and cost required to develop an effective vehicle structure.
Perancangan Sistem Monitoring Tekanan pada Fly Ash System Berbasis Internet Of Things Kurdi, Ojo
ROTASI Vol 23, No 4 (2021): VOLUME 23, NOMOR 4, OKTOBER 2021
Publisher : Departemen Teknik Mesin, Fakultas Teknik, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/rotasi.23.4.35-43

Abstract

Ash handling system memiliki dua sistem utama yaitu fly ash system dan bottom ash system. Yang dimana, setiap komponen itu dipantau menggunakan pressure gauge yang telah terpasang. Kelebihan nilai tekanan yang diterima oleh tiap komponen dapat menyebabkan kerusakan yang merusak alur kerja dari sistem pengolahan limbah abu pembakaran yang berujung dapat menghambat proses pembangkitan listrik di PLTU. Oleh karena itu dibutuhkan sistem monitoring tekanan untuk dapat memonitor langsung dan memastikan apakah tekanan yang dialami setiap instrumen masih sesuai standar. Penggunaan salah satu pilar teknologi industri 4.0 yaitu Internet of Things yang memungkinkan hal tersebut terjadi, sistem monitoring yang dirancang bertujuan untuk memonitor tekanan lewat server yang berisi data dari sensor secara realtime, menyimpan, mengolah, dan juga mengevaluasi data yang sudah tersimpan pada server. Hal ini bertujuan untuk meminimalisir kecelakaan kerja akibat kerusakan instrumen.
Evaluasi Kinerja Unit Traveling Band Screen dengan Menghitung Ulang Daya Motor Penggerak dan Dampak Tegangan Kerjanya Pada Bucket Chain Widyanto, Susilo; Kurdi, Ojo
ROTASI Vol 24, No 1 (2022): VOLUME 24, NOMOR 1, JANUARI 2022
Publisher : Departemen Teknik Mesin, Fakultas Teknik, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/rotasi.24.1.58-64

Abstract

Traveling band screen (TBS) of the intake system has an important function in the power plant system operation which directly relates to the condenser efficiency. TBS utilizes to screen seawater debris before pumped into the condenser unit. The driver motor power of TBS must be able to drive the mechanical system in a condition where the screen is covered by debris at a certain level. This paper presents the evaluation of the driver motor power of TBS which operated in 2x660 MW power plant, where the existing motor (2 hp) often shuts down at the undetermined blockage level of the TBS screen. The calculation results show that the use of 2 HP motor power can only drive the mechanical system at blockage level of 13%. With replacement of the 5 HP motor, the operation limit of the TBS unit can be increased to the blockage level of 36%.  The maximum stress of the bucket chain structure is around of 127 MPa.
Analisis dan optimasi struktur sasis bus dengan batasan tegangan maksimum dan defleksi pada beban maksimum Ojo Kurdi; Ismoyo Haryanto; Agus Suprihanto; Ian Yulianti; Nur Aziyah
Jurnal Teknik Mesin Indonesia Vol 14 No 2 (2019): Jurnal Teknik Mesin Indonesia
Publisher : Badan Kerja Sama Teknik Mesin Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (622.64 KB) | DOI: 10.36289/jtmi.v14i2.139

Abstract

Chassis is an important part of a vehicle, which forms the frame of a vehicle. Chassis must be rigid enough to withstand shock, twist, vibration and other stresses. An important consideration in chassis design is having adequate bending stiffness along with strength for better handling characteristics. Therefore the maximum stress, and deflection are important criteria for chassis design. The purpose of this study is to determine the most optimum design of the three chassis designs of type C, I and Rectangular Box (Hollow). Get the minimum chassis thickness in the Rectangular Box (Hollow) type bus chassis from the ASO and MOGA optimization methods. And comparing the results of the optimization obtained from the two optimization methods. In this study, two types of software were used, namely CAD software (SOLIDWORKS 2015) for the manufacture of bus chassis models and Finite Element Analysis software (ANSYS Workbench v.16) to simulate structural static loading and optimization. The results of this study indicate that the maximum stress occurs in the cross section C with a stress of 73.235 Mpa, and a deflection of 1.5455 mm. The results of the static load analysis show that the design of the type Rectangular Box (Hollow) is far more optimal than type C or I. Based on the optimization on the Rectangular Box (Hollow) type bus chassis with the two methods, the best results use the ASO method with an optimum mass value of 682, 57 kg (mass reduction percentage of 1.224%) with equivalent (von-misses) stress of 53.557 MPa and total deformation of 1.1847 mm. While the results of the optimization of the MOGA method, the optimization mass value of 686.83 kg with equivalent (von-misses) stress of 53.517 MPa and the total deformation was 1.1809 mm. There was a decrease in mass of 0.608%.
ANALISIS RANGKA ROADBIKE DENGAN MATERIAL KOMPOSIT KARBON DAN BAJA MENGGUNAKAN METODE ELEMEN HINGGA Victor Brilliant Loppies; Djoeli Satrijo; Ojo Kurdi
JURNAL TEKNIK MESIN Vol 10, No 2 (2022): VOLUME 10, NOMOR 2, APRIL 2022
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Pada saat ini penggunaan sistem transportasi sudah menjadi gaya hidup di dalam kehidupan sehari-hari masyarakat, Hal tersebut dapat dilihat pada aktivitas kegiatan bersepeda yang hanya digunakan untuk kebutuhan jarak dekat, olahraga, berkumpul bersama teman, dan pengembangan minat. Beberapa jenis sepeda yang umum digunakan oleh masyarakat adalah sepeda lipat, sepeda gunung atau MTB, sepeda fixie, sepeda kota, sepeda BMX, sepeda hybrid, sepeda tandem, dan road bike (sepeda balap). Dampak positif dari perkembangan teknologi memungkinkan para produsen rangka sepeda dapat menentukan jenis material rangka sepeda yang akan digunakan. Jenis material umum yang sering digunakan dalam membuat rangka sepeda adalah baja, baja dinilai mudah didapatkan dan mudah untuk dilakukan proses produksi. Penggunaan material karbon komposit pada rangka sepeda memiliki banyak kelebihan namun juga kekurangan yang harus diperhatikan dalam desainnya. Di antara kerugiannya,  resistensi dampak yang buruk dapat menyebabkan kegagalan prematur dari frame. Dalam melakukan perancangan sepeda pelaku industri harus memastikan kenyamanan dan kekuatan produk sesuai dengan standar yang berlaku. Pengujian rangka secara langsung akan membutuhkan waktu dan biaya yang relatif lebih banyak dibandingkan dengan melakukan analisis menggunakan metode elemen hingga (FEM). Pada penelitian kali ini metode elemen hingga digunakan untuk mengetahui kekuatan dari rangka roadbike dengan metode pembebanan statik. Pembebanan dinamik juga dilakukan untuk mengetahui nilai frekuensi pribadi serta modus getar dari rangka roadbike. Analisis dengan metode elemen hingga ini diharapkan dapat melihat kinerja serta kenyamanan dari rangka roadbike.
Studi Pengaruh Variasi Kuat Arus Pengelasan Pelat AISI 444 Menggunakan Elektroda AWS E316L Ojo Kurdi
Eksergi Vol 13, No 1 (2017): JANUARI 2017
Publisher : Politeknik Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (5170.066 KB) | DOI: 10.32497/eksergi.v13i1.814

Abstract

Baja tahan karat feritik sering digunakan dalam industri pengilangan minyak bumi. Pengelasan adalah proses manufaktur dan perawatan utama yang digunakan, salah satunya adalah pengelasan SMAW (Shielded Metal Arc Welding). Dalam studi ini, penulis menganalisa sifat mekanik pada sambungan pelat pengelasan baja tahan karat feritik AISI 444 dengan tebal pelat 2 mm dengan elektroda AWS A5.4 E316L diameter 2 mm. Karakterisasi yang dilakukan meliputi pengujian tarik, kekerasan mikro, dan struktur mikro. Berdasarkan data dari hasil penelitian didapatkan nilai kekuatan tarik spesimen raw material baja tahan karat feritik sebesar 555 N/mm2, sedangkan nilai kekuatan tarik spesimen hasil pengelasan arus 40 A sebesar 395 N/mm2, 60 A sebesar 511 N/mm2, dan 75 A sebesar 502 N/mm2. Terdapat cacat pengelasan berupa porositas pada weld metal pada pengelasan arus 40 A yang menyebabkan nilai kekuatan tarik menurun. Hasil uji kekerasan menunjukkan nilai tertinggi terdapat pada pengelasan arus 40 A yang memiliki rata – rata kekerasan pada daerah weld metal sebesar 353 HV, daerah HAZ sebesar 365 HV, dan weld metal sebesar 223 HV. Nilai kekerasan menurun seiring menurunnya arus pengelasan. Hal ini didukung dengan hasil uji struktur mikro, spesimen dengan arus pengelasan 40 A memiliki ukuran butir ferit lebih kecil di daerah HAZ, seiring bertambahnya arus pengelasan maka ukuran butir ferit poligonal semakin membesar yang menyebabkan kekerasan spesimen menurun. Kata kunci: Baja tahan karat feritik, SMAW, Uji tarik, Uji kekerasan mikro, Uji struktur mikro.
Studi Upaya Penghematan Energi Listrik pada Gedung Asthabrata PT Mekar Armada Jaya Anjas Yanuar Nugraha; Ojo Kurdi
Eksergi Vol 14, No 1 (2018): JANUARI 2018
Publisher : Politeknik Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (762.975 KB) | DOI: 10.32497/eksergi.v14i1.1139

Abstract

Audit energi merupakan kegiatan untuk mengidentifikasi jenis energi dan mengidentifikasikan besarnya energi yang digunakan pada bagian-bagian operasi suatu industri/pabrik atau bangunan serta mencoba mengidentifikasi kemungkinan penghematan energi. Audit energi yang dilakukan pada yaitu fokus pada penggunaan sistem pencahayaan dan sistem pendinginan. Gedung Asthabrata merupakan gedung di PT Mekar Armada Jaya yang berada di tengah-tengah kawasan autobody manufacturing PT Mekar Armada Jaya. Gedung yang digunakan sebagai kantorBidang Engineering. Dari data yang didapat konsumsi energi Gedung Asthabrata untuk sistem pencahayaan yaitu sebesar 50,8 kWh perhari, untuk sistem pendinginan sebesar 143,48 kWh perhari. Tingkat pencahayaan semua ruangan di gedung Asthabrata belum memenuhi standar yang ditetapkan oleh Badan Standar Nasional Indonesia. Kapasitas AC untuk semua ruangan di gedung Asthabrata belum memenuhi standar menurut perhitungan rumus yang ditetapkan. Hasil dari simulasi penghematan dapat disimpulkan bahwa dengan menggunakan lampu jenis LED dapat mengurangi jumlah energy sebesar 55% dari lampu jenis flourence. Untuk sistem pendinginan dilakukan simulasi penghematan dapat diketahui bahwa dengan menggunakan AC jenis inverter dapat mengurangi jumlah energy sekitar 56% dari AC jenis biasa. Dilihat dari simulasinya dapat ditarik kesimpulan bahwa simulasi ketiga dengan AC merek B paling signifikan dalam mengurangi jumlah penggunaan energy sebesar to73,1 kWh/hari. Kata Kunci: Audit energi, Sistem pencahayaan, Sistem pendinginan
Co-Authors Abd Latif, Mohd Juzaila Achmad Widodo Adriathma, Abduh Bayu Agus Suprihanto Andrean Rizky Agung Maulana Anjas Yanuar Nugraha Ardynugraha, Ivan Dwi Hascaryo Ari Wibawa Arijanto Arijanto Aris Haryanto Aulia Rahman Bagus Budiwantoro Bagus Budiwantoro Budi Setiyana Budiman, Bentang Darmawan, Mikhael Dixon Djoeli Satrijo Dwi Basuki Wibowo Dwiyanto, Andreas Eko Sasmito Hadi Falah, Bahtiar Ghazali, Tsaqif Al Farrel Gunawan Dwi Haryadi Gunawan, Leonardo Haryadi, Gunawan Ian Yulianti Ian Yulianti, Ian Ibnu Agistia Dzaky Ismoyo Haryanto Juliansyah, Muhammad Anas Karnoto . Khoiri Rozi Khoiri Rozi Kristiyanto, Dionysius Abdi Kurnia Nugraha Kusuma, Kevin Ardi Latif, Mohd Juzaila Abd Maharsi Anung Kesawasidhi Mohammad Tauviqirrahman Muhammad Fakhri Aji Pratomo Munir, Fudhail Abdul Mush’ab Mush’ab Nadarajan, Nantha Kumar Nugraha, Anjas Yanuar Nugraha, Kurnia Nur Aziyah Nurgalih Prasetiya Pangestu, Aldian Dwi Pranatagama, Sultan Alif Pratomo, Muhammad Fakhri Aji Raharjo, Fuad Rayhan, Muhammad Arif Roslan Abdul Rahman Samin, Pakharudin Mohd Santosa, Sigit Satya, Ibrahim Suganda, Dhenada Dhyo Susilo Widyanto, Susilo Toni Prahasto Victor Brilliant Loppies Yob, Mohd Shukri Yusuf Umardani