Garuda - Garba Rujukan Digital

RANCANG BANGUN SPESIMEN UNTUK KEBUTUHAN ULTRASONIC TEST BERUPA SAMBUNGAN LAS BENTUK T JOINT PIPA BAJA Riswanda Riswanda; Lenny Iryani
FLYWHEEL : Jurnal Teknik Mesin Untirta Volume III Nomor 1, April 2017
Publisher : Universitas Sultan Ageng Tirtayasa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36055/fwl.v1i1.1463

Pengelasan adalah salah satu cara menyambungkan dua buah logam dengan cara mencairkan kedua logam menggunakan energi panas. Metode pengelasan yang digunakan pada penelitian ini yaitu dengan proses Shielded Metal Arc Welding (SMAW). Spesimen uji pada proses SMAW terdiri dari dua buah pipa yang disambung membentuk sambungan T. Proses pengelasan pipa sengaja di buat cacat, setelah proses pengelasan selesai berikutnya sambungan pipa diuji dengan menggunakan metode Non-Destructive Testing (NDT) jenis Radiografi test untuk mengidentifikasi cacat yang terbentuk pada sambungan las tersebut. Hasil penelitian ini berupa spesimen cacat dengan posisi sesuai rancangan awal. Spesimen tersebut akan digunakan untuk keperluan bahan praktik pada mata kuliah teknik pengujian cacat material tanpa merusak (NDT) Ultransonic Test di Program Studi Teknik Aeronautika, Jurusan Teknik Mesin, Politeknik Negeri Bandung.

PERHITUNGAN FAILURE INDEX STRUKTUR SAYAP PESAWAT TERBANG TANPA AWAK Ai-X1 DENGAN MENGGUNAKAN KRITERIA TSAI-HILL DISIMULASIKAN DENGAN METODE ELEMEN HINGGA Lenny Iryani; Singgih Satrio Wibowo
Jurnal Teknologi Dirgantara Vol. 18 No.1 Juni 2020
Publisher : National Institute of Aeronautics and Space - LAPAN

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30536/j.jtd.2020.v18.a3228

Untuk mengetahui kekuatan struktur suatu pesawat terbang, dilakukan perhitungan dan analisis kekuatan struktur. Struktur sayap pesawat terbang yang disusun dari material komposit, penghitungan dan analisis kekuatan struktur salah satunya dilakukan dengan menghitung failure index untuk masing-masing layer/susunan dari material komposit tersebut. Pada penelitian ini, struktur sayap Pesawat terbang tanpa awak (PTTA) Ai-X1 yang terbuat dari material komposit dianalisis kekuatan strukturnya dengan menghitung failure index dari masing-masing layer/susunan material komposit tersebut. Perhitungan failure index dilakukan dengan menggunakan kriteria kegagalan Tsai-Hill. Hasil dari penelitian ini yaitu nilai failure index pada masing-masing layer/susunan material komposit struktur sayap pesawat Ai-X1. Berdasarkan kriteria Tsai-Hill masing-masing layer/susunan tersebut menunjukkan tidak adanya keretakan pada lamina.

Analisis Geometris Sistem Kendali Elevator Pesawat Udara N219 Lenny Iryani; Arie S Ramadhan
METAL: Jurnal Sistem Mekanik dan Termal Vol 5, No 2 (2021): Jurnal Sistem Mekanik dan Termal (METAL)
Publisher : Department of Mechanical Engineering, Universitas Andalas

Flight control of elevator are used to control the attitude of the aircraft in pitching configuration. The system of this flight control are controlled by the force given by a pilot so that the aircraft will move to the desired pitch condition. In this research the force that should be inputted by a pilot easily and smooth are analyze. The study of this analysis was using N219 airplane designed by PT. Dirgantara Indonesia. The preliminary design of the force that should be inputted by a pilot are in 495 kN.mm. The result of the study are shown that the length of the arm in the elevator system give Margin of Safety in a range of 3 – 4.

Rancang Bangun dan Modifikasi RPV Fixed Wing untuk Misi Pemetaan: Kaji Sistem Instrumentasi Diky Prasetyo; Lenny Iryani
Prosiding Industrial Research Workshop and National Seminar Vol 13 No 01 (2022): Vol 13 (2022): Prosiding 13th Industrial Research Workshop and National Seminar
Publisher : Politeknik Negeri Bandung

Unmaned Aerial Vehicle (UAV) adalah sebuah mesin terbang yang berfungsi dengan cara dikendalikan dengan jarak jauh oleh pilot. UAV banyak digunakan dalam berbagai kebutuhan seperti foto udara dan pengawasan wilayah. Penelitian akan dilakukan dengan melakukan rancang bangun RPV untuk misi pemetaan dengan menggunakan pixhwak radiolink dan menggunakan QGroundControl sebagai ground control station. Penelitian ini akan berfokus pada sistem instrumentasi serta hasil dari uji terbang. Metode penelitian dimulai dari penentuan DRO, penentuan komponen, kalibrasi komponen, perakitan komponen, uji terbang manual, dan uji terbang autonomous. Hasil dari empat tes penerbangan menunjukkan bahwa RPV dapat terbang menggunakan pixhawk radiolink dan berhasil menerima log data penerbangan. Waktu terbang terbaik dicapai pada uji terbang pertama tanpa menggunakan sistem selama 1 menit 30 detik. Log penerbangan diperoleh dengan kecepatan rata-rata 2,16 m/s dan 2 m/s selama uji terbang kedua dan ketiga. Uji terbang ketiga RPV hanya berlangsung 4 detik di udara dan jatuh dari ketinggian 13 meter. Uji terbang keempat hanya memakan waktu 12 detik, dengan jarak 106 meter dan ketinggian jatuh 17 meter. Penyebab jatuhnya adalah hilangnya sinyal telemetri dan remote control.

Finite Element Method Analysis in Simulation of Induction Heater Using Helical Coil Method Lenny Iryani; Adolf S
METAL: Jurnal Sistem Mekanik dan Termal Vol 7, No 1 (2023): Jurnal Sistem Mekanik dan Termal (METAL)
Publisher : Department of Mechanical Engineering, Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/metal.7.1.23-26.2023

The problem of corrosion is very common in aircraft structure. This phenomenon is happened because of the two different types of material are in contact under moist or water. Along the operational hours of the aircraft structure, this corrosion is identified during the maintenance activity. To study about the corrosion removal by using the helical coil method, in this research the simulation of the removal corrosion in bolt and nut joint are conducted. The aim of the analysis i.e., to get the optimum electric current and frequency for induction heaters to heat stainless steel nuts that cannot be open, or the threads are stuck. The study was carried out so that the stainless-steel nuts reached a temperature of 400°C in one minute. Several variations of the electric current are carried out with magnitudes, namely 30 A, 40 A, 50 A and frequency variations of 300 kHz, 400 kHz, 500 kHz. Based on the variation of the electric current and frequency, the optimal electric current and frequency is generated to heat a stainless-steel nut that cannot be opened, or the screw is stuck at 50 A and 500 kHz with a temperature of 394°C in one minute.

Measurement of Ankle Brachial Index with Oscillometric Method for Early Detection of Peripheral Artery Disease Ervin Masita Dewi; Gema Ramadhan; Robinsar Parlindungan; Lenny Iryani; Trisno Yuwono
Jurnal Rekayasa Elektrika Vol 18, No 2 (2022)
Publisher : Universitas Syiah Kuala

Peripheral Arterial Disease (PAD) is a blood vessel disease caused by blockage or plaque accumulation around the artery walls. PAD is included in the category of diseases that are often diagnosed too late and affect more severe cases, such as the death of certain tissues or body parts. The Ankle Brachial Index (ABI) is an accurate non-invasive method for diagnosing PAD, in practice, ABI is usually performed in certain hospitals and is still difficult to find due to limited tools. Therefore, a tool is made that can detect the condition of a person's PAD based on the ABI value. The tool is made using two MPX5050GP sensors to detect oscillometric pulses, a DC pump and solenoid valve as an actuator to pump and deflate the cuff, ADS1115 as an external ADC to increase the accuracy of sensor readings, as well as an LCD and buzzer as tool indicators. The output is displayed in the form of a print out from a thermal printer, with an emergency stop that functions as a safety system to power off the supply when a failure occurs in the measurement process. Oscillometric method is used to detect systolic and diastolic pressure. The accuracy of the tool is 95.5%. This accuracy result is obtained by comparing the readings of systolic and diastolic values using a sphygmomanometer which is commonly used.

Measurement of Ankle Brachial Index with Oscillometric Method for Early Detection of Peripheral Artery Disease Ervin Masita Dewi; Gema Ramadhan; Robinsar Parlindungan; Lenny Iryani; Trisno Yuwono
Jurnal Rekayasa Elektrika Vol 18, No 2 (2022)
Publisher : Universitas Syiah Kuala

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17529/jre.v18i2.25758

Peripheral Arterial Disease (PAD) is a blood vessel disease caused by blockage or plaque accumulation around the artery walls. PAD is included in the category of diseases that are often diagnosed too late and affect more severe cases, such as the death of certain tissues or body parts. The Ankle Brachial Index (ABI) is an accurate non-invasive method for diagnosing PAD, in practice, ABI is usually performed in certain hospitals and is still difficult to find due to limited tools. Therefore, a tool is made that can detect the condition of a person's PAD based on the ABI value. The tool is made using two MPX5050GP sensors to detect oscillometric pulses, a DC pump and solenoid valve as an actuator to pump and deflate the cuff, ADS1115 as an external ADC to increase the accuracy of sensor readings, as well as an LCD and buzzer as tool indicators. The output is displayed in the form of a print out from a thermal printer, with an emergency stop that functions as a safety system to power off the supply when a failure occurs in the measurement process. Oscillometric method is used to detect systolic and diastolic pressure. The accuracy of the tool is 95.5%. This accuracy result is obtained by comparing the readings of systolic and diastolic values using a sphygmomanometer which is commonly used.

6. PENGARUH ADVERSITYQUOTIENTTERHADAP RESILIENCE TARUNA AKADEMI ANGKATAN UDARA Andre; Lenny Iryani; Ridwan; T. Riyanto
Jurnal TNI Angkatan Udara Vol 2 No 3 (2023): Jurnal TNI Angkatan Udara Triwulan Ketiga
Publisher : Staf Komunikasi dan Elektronika, TNI Angkatan Udara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62828/jpb.v2i3.74

Mekanisme perkuliahan di Akademi Angkatan Udara (AAU) memiliki perbedaandengan mekanisme penyelenggaraan perkuliahan di universitas pada umumnya termasukjuga pada perguruan tinggi kedinasan lainnya (non militer). Di AAU mereka dilatih, dididik, dandibina secara kemiliteran, sehingga secara psikologis memerlukan daya tahan terhadap stresyang tinggi. Untuk menghadapi hambatan dalam pendidikan, para taruna AAU memerlukankemampuan psikologi tertentu agar dapat bertahan dan menyesuaikan diri di bidang akademismaupun kemiliterannya. Kemampuan tersebut disebut adversity quotient dan resilience. Metodepengumpulan data dalam penelitian ini menggunakan Skala Adversity Quotient (26 aitem, α=0,904)dan Skala Resilience (38 aitem, α=0,960). Skala yang digunakan adalah skala likert serta analisisstatistiknya menggunakan SPSS versi 26. Hasil analisis data dengan metode analisis regresi liniersederhana mendapatkan rxy = 0,853 dengan ρ = 0,000 (ρ <0,05). Berdasarkan hasil penelitian,terdapat hubungan positif dan peran yang signifikan antara adversity quotient terhadap resiliencetaruna Akademi Angkatan Udara. Arah hubungan positif menunjukkan bahwa semakin tinggiadversity quotient maka tingkat resilience taruna Akademi Angkatan Udara akan semakin tinggi.Adversity quotient berperan sebesar 72,7% terhadap tingkat resilience taruna Akademi AngkatanUdara. Namun demikian, terdapat faktor lain sebesar 27,3% yang menentukan resilience selaindari adversity quotient.

PENGARUH VARIASI KUAT ARUS SMAW TERHADAP SIFAT MEKANIK BAJA AISI 1045 Destri Muliastri; Lenny Iryani; Dibyo Setiawan; Kukuh Ramadhan; Toni Okviyanto
Jurnal Konversi Energi dan Manufaktur Vol. 9 No. 2 (2024)
Publisher : Universitas Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21009/JKEM.9.2.8

This study discusses the effect of variations in the parameters of the welding process on the tensile strength and Vickers hardness tests. In general, it is widely known that in the fabrication process, welding is a very important process that is used to join two or more materials. The welding process is carried out with variations in the strength of the welding current, namely 75, 85, and 95 A. The experimental method used in this research is AISI 1045 steel material with a thickness of 6.0 mm. The results of the tensile strength test have the highest value at a current strength of 75 A which is equal to 756.642 MPa. The lowest tensile strength test results were obtained with a tensile strength of 687.608 MPa at a current strength of 95 A. specimens with variations in current strength of 95 A have the highest value in the Vickers hardness test, with a hardness value of 281.25 HV. From the research conducted it is known that as the welding current increases there is a decrease in the value of the tensile strength. The hardness value in the heat affected zone (HAZ) area of all test specimens has the highest value, while the hardness value of weld metal (WM) and base metal (BM) has almost the same hardness value.

Manufacturing Induction Heating Based on Helical Coil Method by Using Arduino Mega 2560 Muhammad Hasan; Lenny Iryani
METAL: Jurnal Sistem Mekanik dan Termal Vol 8, No 1 (2024): Jurnal Sistem Mekanik dan Termal (METAL)
Publisher : Department of Mechanical Engineering, Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/metal.8.1.%p.2024

Galvanic corrosion is a type of corrosion that often occurs in aircraft structures. This type of corrosion occurs because two different types of materials contact each other through an electrolyte media. As a result of this galvanic corrosion, several components in the aircraft structure can be damaged. One example of this damage is the corrosion of the bolts on the aircraft skin. So that makes it difficult to remove from the skin. One way to loosen the bolts due to galvanic corrosion is by heating. By using induction heater to the component, the rusty bolt can be loosened. The heat generated causes the bolt to stretch and break the corrosion and so that the bolt or nut can be opened easily. In this research, by using an Arduino Mega 2560 model to remove bolts and nuts with an open loop and closed loop system was conducted. Arduino Model as a microcontroller which is needed to run a program. The specimens of the bolts are using steel bolts grade 8.8 with key sizes 13, 17, and 19. The temperature to produce induction heater is set to a temperature of 150 °C. The results show that to reach 150 oC each of the key size its produce a different duration of time. Key size 13 took 190 seconds with 35.64 watts of power, key size 17 took 279 seconds with 36.96 watts power and the 19 key took 296 seconds with 41.43 watts power.

Title

Found 11 Documents
Search

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Title Search

Found 11 Documents Search

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Title

Found 11 Documents
Search