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Rotasi
Published by Universitas Diponegoro
ISSN : 1411027x     EISSN : 24069620     DOI : -
Core Subject : Engineering,
Mechanical Engineering
Arjuna Subject : -
Articles 676 Documents
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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.
Effect of Webbing Angle on Tensile and Bending Strengths in Human Hair Fiber Reinforced Composites Paundra, Fajar
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.24.1.30-35

Abstract

Composite is a combination of two or more materials that have different basic properties. This study aims to analyze the effect of woven angle on hair fiber composites on tensile and bending strength. The composite is composed of polyester resin and human hair waste. Hair was soaked in 5% NaOH solution for 1 hour and woven with angle orientation 0°/90°, 15°/105°, 30°/120° and 45°/135°. The process of making composites is made by the Compression Molding method for 24 hours. After making the composite, a density test was carried out with the ASTM C271 standard, tensile test with ASTM D3039 standard and bending test with the ISO 178 standard. The results of the density test obtained an increase in the density value with the lowest density value of 0.82 g/ml and the highest 0.85 g/ ml to produce a lighter composite. Then the tensile test results show the highest tensile strength value of 16.47 MPa which occurs at an angle of 0°/90°. The results of the bending test obtained an increase in bending strength with the highest bending strength value of 47.1 MPa which occurred at an angle of 0°/90°.
Analisis Quality Control Produk Umpak Tiang Lampu Menggunakan Metode Quality Control Circle Norman Iskandar
ROTASI Vol 24, No 2 (2022): VOLUME 24, NOMOR 2, APRIL 2022
Publisher : Departemen Teknik Mesin, Fakultas Teknik, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/rotasi.24.2.10-18

Abstract

Pengendalian kualitas merupakan suatu aktivitas (manajemen perusahaan) yang diarahkan untuk menjaga agar kualitas produk dan jasa di perusahaan dapat dipertahankan. Kondisi ini dipakai untuk mencapai sasaran yang telah direncanakan. Artikel ini membahas pengendalian kualitas  menggunakan metode Quality Control Circle (QCC). Metode yang dilakukan adalah mengamati produksi Umpak Tiang Lampu pada rentang bulan Januari 2019 - September 2021 sebanyak  1761. Produk cacat selama 3 tahun adalah 223 produk.  Cacat yang terjadi pada produk ada tiga tipe meliputi cacat keropos, cacat permukaan tidak halus dan cacat tidak utuh. Berdasarkan perhitungan dari keseluruhan hasil produk cacat pada umpak didapat nilai UCL (Upper Control Limit) atau batas kendali atas senilai 0,394 dan didapat nilai LCL (Lower Control Limoit) atau batas kendali bawah  sebesar -0,308 ,dan nilai CL (Control Limit) atau batas kendali sebesar 0,043. Dari data ini di ketauhi bahwa nilai proporsi kecacatan produk dari tahun 2019 berada di titik 0,14, 2020 berada di titik 0,12 dan 2021 berada di titik 0,12  yang berarti belum ada yang mendekati titik batas kendali atas maupun batas kendali bawah dan masih berada dalam batas kendali. Dari analisa pareto diagram dapat diperlihatkan bahwa cacat produk dari 3 jenis, nilai terbesar pada cacat tidak halus. Prosentase cacat tidak halus pada produk Umpak Tiang Lampu adalah sebesar 54,26 %. Pengunaan metode UCL, LCL dan diagram pareto dapat membantu dalam penentuan aktifitas produk untuk mingkatkan kualitas produk dan mengurangi cacat produk
Analisis Pengujian Co-Firing Biomassa Cangkang Kelapa Sawit Pada PLTU Circulating Fluidized Bed (CFB) Sebagai Upaya Bauran Energi Terbarukan Indra Ardhanayudha Aditya; Fajar Nurrohman Haryadi; Indri Haryani
ROTASI Vol 24, No 2 (2022): VOLUME 24, NOMOR 2, APRIL 2022
Publisher : Departemen Teknik Mesin, Fakultas Teknik, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/rotasi.24.2.61-66

Abstract

The co-firing characteristics of palm kernel shell biomass are implemented at a Circulating Fluidized Bed (CFB) power plant to determine the effect of co-firing on the potential for corrosion, slagging, fouling, and specific fuel consumption (SFC). Biomass co-firing fuel is mixed in a stockpile with the composition of the co-firing scenario, namely 5%, 10%, 15%, and 20% palm shells for the burn test. Data is retrieved after a stabilization period and then automatically recorded by the data acquisition system. The test results show a lower calorific value, higher volatile matter content, and higher ash content than the coal used during the test. The percentage of oil palm shells in co-firing increases the SFC at the PLTU up to 3,7%. Lower sulfur and HGI content than coal make it more challenging to work. The ratio of base to acid when co-firing 5%, 10%, and 15% palm shells are in the high/weight category. The slagging index when coal burning and co-combustion is still at a safe limit. The Fouling Index for coal combustion and co-firing of 5%, 15%, and 20% of palm shells is in the high category, while co-firing of 10% of palm shells is severe. Based on the sulfur and chlorine data in the fuel, the ratio of 2S/Cl during coal combustion and co-firing is feasible >8. The corrosion potential due to the presence of chlorine is Cl-induced active synthesis minor.
AAnalisis Pengaruh Slip, Open Pocket, dan Pemodelan Kavitasi terhadap Karakteristik Thermohydrodynamic Thrust Bearing dengan Menggunakan CFD Muchammad Muchammad
ROTASI Vol 24, No 2 (2022): VOLUME 24, NOMOR 2, APRIL 2022
Publisher : Departemen Teknik Mesin, Fakultas Teknik, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/rotasi.24.2.19-26

Abstract

Thrust bearing merupakan bantalan yang didesain untuk menahan beban yang sejajar dengan sumbu aksial dari permukaan yang berputar hal ini membuat penggunaan pelumas memegang peranan yang sangat penting untuk membatasi gesekan yang terjadi antara komponen-komponen yang mengalami kontak sehingga dapat menghindari efek negatif akibat gesekan tersebut. Perkembangan dalam dunia industri dan kebutuhan manusia yang pesat menghadapkan para ilmuan pada persoalan untuk dapat meningkatkan performa pada bantalan. Adapun salah satu cara atau metode yang digunakan untuk meningkatkan performa bearing yaitu dengan memberikan kondisi batas slip, memberikan surface texturing berupa open pocket pada permukaan bearing dan pemodelan fenomena kavitasi.Penelitian ini bertujuan untuk mengetahui pengaruh pemberian slip, pemberian open pocket, dan pemodelan non kavitasi dan dengan kavitasi pada pelumasan thrust bearing serta menggunakan variasi nilai Hmin yaitu: 15, 20, 50, dan 80 terhadap peforma thrust bearing yang dilihat dari distribusi temperatur, distribusi tekanan, load support, dan friction.Hasil akhir penelitian ini menunjukkan bahwa, pemberian kondisi open pocket dengan permukaan slip menghasilkan nilai dari load support, friction, dan tekanan yang tinggi, serta pengaruh temperatur pada kondisi open pocket dengan permukaan slip sangat kecil sehingga nilai load support tetap meningkat. Selain itu, untuk kondisi kavitasi dan non kavitasi, untuk hasil tekanan, load support, friction hasil non kavitasi lebih besar dibandingkan hasil kavitasi. Namun, untuk hasil temperatur berbanding terbalik, dimana hasil non kavitasi lebih rendah dibandingkan hasil kavitasi.
Optimasi Desain Ulang Stator Pompa Progressive Cavity Dengan DfD dan Solidworks CAD Riki Candra Putra
ROTASI Vol 24, No 2 (2022): VOLUME 24, NOMOR 2, APRIL 2022
Publisher : Departemen Teknik Mesin, Fakultas Teknik, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/rotasi.24.2.67-75

Abstract

Progressive cavity pump designs generally have a stator component in the form of a solid hollow cylinder and a rotating rotor, because of the constraints faced by technicians specifically on the PC type pump, namely the need for lifting equipment, and some special equipment and very time consuming pump assembly. long time, due to the complicated pump design. Because these problems can make progressive cavity pumps become waste in the company due to the lack of good maintenance for this type of pump. Therefore, it is necessary to redesign and optimize the stator design in order to obtain a faster assembly time, easier pump maintenance and cheaper maintenance costs. By using the principles of Design for Disassembly (DfD), and assisted by CAD software and flow simulation analysis so that it can make it easier for researchers to redesign and optimize products. After redesigning the stator into a split stator and a simpler rotor design, the flow simulation analysis found that the flow rate and pressure of the DfD pump did not experience very large changes and did not affect the overall pump performance. The number of tools needed to assemble the stator and rotor of the pump after DfD is 7.14% cheaper than the pump before DfD. The processing time of the DfD pump stator assembly stages is 23% faster and the DfD pump rotor assembly is 14.3% faster than the pump before DfD. The percentage of the difference in the price of components that are wasted (waste) in DfD pumps is 10.5% less than non-DfD pumps when replacing the stator and rotor.
Sistem Pengukuran Defleksi Crankshaft Dengan Visualisasi Pola Defleksi Eko Supriyanto; Susilo Adi Widyanto; Sahrijal Purba; Ariyana Dwiputra Nugraha; Meiri Triani; Rasgianti Rasgianti; Ruly Sitanggang; Nur Cahyo
ROTASI Vol 24, No 2 (2022): VOLUME 24, NOMOR 2, APRIL 2022
Publisher : Departemen Teknik Mesin, Fakultas Teknik, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/rotasi.24.2.27-36

Abstract

The crankshaft is one of the main components of a combustion engine. Due to the engine's operating conditions and operation time, the crankshaft alignment may deviate to a particular value that should not exceed the standard limit. When the deviation value has exceeded the limit, the crankshaft will fail. In this research, the design of the crankshaft deflection measurement system was carried out with the visualization of the deflection pattern. The method is done by measuring five positions of the axial deviation between the web surfaces on each piston using a digital dial indicator. Measurement data at each point is then sent and stored in the control panel device wirelessly. Furthermore, the complete measurement data is taken, processed, and displayed in the developed software application to visually display the crankshaft deflection pattern. The test results show that the accuracy of the measuring instrument is 0.001 mm, where this value has met the prerequisites for testing the crankshaft deflection, which is 0.12 mm.
Development of Robotic Arm Controller Using Arduino Microcontroller and Mobile Device Application Nanang Ali Sutisna; Muhammad Irfan Satria
ROTASI Vol 24, No 2 (2022): VOLUME 24, NOMOR 2, APRIL 2022
Publisher : Departemen Teknik Mesin, Fakultas Teknik, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/rotasi.24.2.76-86

Abstract

In today's world, automation is widely used in many aspects to help humans do their job and increase the efficiency of the job. The robot is one of the kinds of an automation system that mostly used to help human to completed their job. Robots have many roles in human life, and robots are used to help humans do various kinds of jobs more easily. Robots are widely used because they can make it easier and done the work effectively and efficiently. There are many implementations of the robot to help humans do their jobs, such as welding robot, agriculture robot, drone robot, and many more. A robot arm is one type of robot that we often encounter, and a robot arm has a function similar to a human arm. In its application, the robot can be controlled through several methods, some are directly using a cable connection, and some are using a wireless method. Also, to control a robot, a controller is needed, which will be the robot's brain. This project aims to develop a controller based on Arduino, one of the most widely used microcontroller boards for education, hobby, or professional, and develop a mobile device application to control the robot arm via Bluetooth connection. The methodology used in this research is starting from the identification and data collection of the program from several sources such as a journal or discussion forum, then continue with the systems schematic design of the hardware that used in this project and will continue by the program of the Arduino and smartphone app. The testing result shows the accuracy of actual motion is quite close to the desired position as programmed, and the servo test shows that the error value average is about 3,54% for the MG996R servo and 4,44% for the SG90 servo. Thus, the robot error value is about 1,38% on the x-axis and 12,14% on the y-axis in the first test. And for the second test is about 1,96% on the x-axis and 3,15% on the y-axis.
Pengaruh Penggunaan Dinding Kaca Ruang Pengering terhadap Kinerja Solar Paddy Dryer Bambang Yunianto
ROTASI Vol 24, No 2 (2022): VOLUME 24, NOMOR 2, APRIL 2022
Publisher : Departemen Teknik Mesin, Fakultas Teknik, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/rotasi.24.2.37-42

Abstract

Pengeringan gabah padi adalah suatu perlakuan yang bertujuan menurunkan kadar air gabah sehingga dapat disimpan lama dan mutu dapat dijaga tetap baik. Ada banyak metoda pengeringan gabah salah satunya dengan solar pady dryer (SPD). Jika dibandingan dengan pengering gabah energy listrik dan bahan bakar, keunggulan utama pengering SPD adalah  hemat biaya, sederhana dan ramah lingkungan. Adapun kelemahannya adalah kontruksi tidak kompak , efisiensi pengeringan rendah dan hanya bisa bekerja pada siang hari (adanya sinar matahari). SPD yang digunakan pada penelitian ini ialah tipe kombinasi yaitu terdiri dari solar air dryer (SAD) plat datar dan ruang pengering gabah. Peningkatan efisiensi SPD dapat dilakukann  dengan meningkatkan energy berguna SAD yaitu dengan menetapkan kecepatan udara yang optimum dan juga memanfaatkan energy matahari dapat langsung memanasi gabah dalam ruang pengering. Untuk itu  dinding ruang pengering dibuat dari kaca. Ukuran SAD yang digunakan ialah 0,5 m x 1  m x 0,15 m, sedang ukuran ruang pengering  1m x 0.95 m x 1,7 m.Untuk mengetahui kinerja SPD, pengujian dilakukan menggunakan 2 metode ialah ruang pengering dengan dinding kaca tanpa tutup (terbuka) dan ruang pengering dengan dinding kaca berpenutup. Masing-masing metoda diuji pada 2 variasi kecepatan yaitu 7 m/dt dan 10 m/dt. Pada ruang pengering dengan kaca terbuka, panas matahari dapat langsung memanasi gabah dalam ruang pengering dan juga memanasi udara lewat SAD sebagai sumber udara panas utama, Adapun ruang pengering dengan kaca tertutup, panas matahari tidak dapat memanasi langsung ke dalam ruang pengering,  tetapi harus dilewatkan SAD untuk memanasi udara masuk ruang pengering. Pengujian dilakukan selama 5 jam dari jam 09.00 sampai dengan 15.00 dan pengambilan data dicari pada saat hari-hari cuaca cerah untuk mendapatkan intensitas matahari yang tinggi.Dari pengujian didapatkan prestasi tertinggi terjadi pada pengering dengan kaca terbuka,  kecepatan 7 m/detik dan intensitas matahari rata-rata 850 W/m2 , yaitu  kandungan air gabah berkurang dari 24% menjadi  13.2% dan efisensi pengeringan yaitu 12.5% (gabah 8 kg menjadi 7 kg). Sedangkan prestasi terendah adalah pada kondisi kaca berpenutup pada kecepatan 7 m/detik dan intensitas matahari rata-rata 778 W/m2 dengan efisiensi pengeringan 7,9 % (gabah 8 kg menjadi 7,366 kg)   
Front Matter Rotasi Vol. 24 No. 2 April 2022
ROTASI Vol 24, No 2 (2022): VOLUME 24, NOMOR 2, APRIL 2022
Publisher : Departemen Teknik Mesin, Fakultas Teknik, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/rotasi.24.2.i-v

Abstract

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