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PENGARUH PAMDEMI COVID-19 TERHADAP ASPEK BELAJAR PADA PELAJAR SEKOLAH MENENGAH ATAS DI DKI-JAKARTA Julian, James; Wahyuni, Fitri; Zuchriadi, Achmad; Ferdyanto, Ferdyanto; Tua, Lomo Mula
Jurnal Muara Sains, Teknologi, Kedokteran dan Ilmu Kesehatan Vol 5, No 1 (2021): Jurnal Muara Sains, Teknologi, Kedokteran dan Ilmu Kesehatan
Publisher : Universitas Tarumanagara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24912/jmstkik.v5i1.9445

Changes in behavior and normal habits during the Covid-19 pandemic are a challenge faced by any part of the world. A sudden change in habit will certainly have a very significant impact on some circles such as students. Changes in the learning system that were previously carried out offline and changed suddenly online certainly have an impact on the readiness of students to prepare themselves. This study aims to examine the impact of quantitative changes in learning habits from offline systems to online systems by using questionnaires distributed throughout the capital city of Indonesia, namely DKI Jakarta. All of these studies were carried out comprehensively and massively to obtain valid and actual data. Several analytical methods are used such as validity tests, ANOVA tests, and Likert scale tests which are useful for (1) ensuring all data is in good Validity, (2) analyzing and drawing some conclusions from changes in student behavior during the Covid-19 pandemic. From the results of the study, it was found that 47% of students living in the capital city of Indonesia already understand the dangers of the Covid-19 pandemic, the online learning system that has been carried out can become a new habit as much as 54%, the problem that hinders students during this pandemic is Mager (lazy to move) by 36% and the most popular learning system during the pandemic was online learning together with teachers by 68%. (2) analyze and draw some conclusions from changes in student behavior during the Covid-19 pandemic. From the results of the study, it was found that 47% of students living in the capital city of Indonesia already understand the dangers of the Covid-19 pandemic, the online learning system that has been carried out can become a new habit as much as 54%, the problem that hinders students during this pandemic is Mager (lazy to move) by 36% and the most popular learning system during the pandemic was online learning together with teachers by 68%. Keywords: Covid-19, new habits, offline, online, students. AbstrakPerubahan perilaku dan kebiasaan normal selama pandemi Covid-19 menjadi suatu tantangan tersendiri yang dihadapi oleh belahan dunia manapun. Perubahan kebiasaan secara mendadak tentu akan berdampak sangat signifikan terhadap beberapa kalangan seperti kalangan pelajar. Perubahan sistem belajar yang sebelumnya dilakukan secara luring dan berubah tiba-tiba secara daring tentu berdampak pada kesiapan pelajar dalam mempersiapkan diri mereka masing-masing. Penelitian ini bertujuan untuk mengkaji dampak perubahan dari kebiasaan belajar yang berubah dari sistem luring menjadi sistem daring secara kuantitatif dengan mengunakan kuisioner yang disebar ke seluruh wilayah ibukota Indonesia, yaitu DKI Jakarta. Semua penelitian ini dilakukan secara komprehensif dan masif guna mendapatkan data yang valid dan aktual. Beberapa metode analisis digunakan seperti uji validitas, uji ANOVA dan uji skala Likert yang berguna untuk (1) memastikan seluruh data dalam valitidas yang baik, (2) menganalisa dan menarik beberapa kesimpulan dari perubahan perilaku pelajar selama pandemi Covid-19 ini berlangsung. Dari hasil penelitian didapatkan bahwa pelajar yang tinggal di Ibukota Indonesia sebesar 47% sudah memahami bahaya pandemi Covid-19, sistem belajar daring yang telah dilakukan bisa menjadi kebiasaan baru sebanyak 54%, masalah yang menjadi penghambat pelajar selama pandemi ini adalah Mager (malas gerak) sebesar 36% dan sistem belajar yang paling diminati selama pandemi adalah belajar daring bersama-sama dengan guru sebesar 68%.

ANALYSIS OF COGGING TORQUE REDUCTION FROM DESIGN COMPUTATIONAL PERMANENT MAGNET SYNCHRONOUS MOTOR WITH TAGUCHI METHOD Wahyuni, Fitri; Julian, James; Ferdyanto, Ferdyanto; Fauzi, Ade Fikri
Jurnal Rekayasa Mesin Vol. 15 No. 1 (2024)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v15i1.1492

Permanent Magnet Synchronous Motor (PMSM) applications include electric vehicles, industrial pumps, wind turbines, aerospace technology, and many others. In this study, cogging torque is the central aspect of the discussion, which is the motor model, the thickness of the permanent magnet rotor, and the air gap in the electric motor influence. The Taguchi method uses parameter levels on the motor, which are divided into 16 types of orthogonal arrays, where the process is carried out twice in iterations. The first stage of simulation testing was to produce the primary model where number 4 (A1B4 series) was obtained as the most optimal motor model with a cogging torque of 1.56 Nm and an air gap flux density of 768 mTesla (mili tesla). Then the second test was to modify several parts of the motor with the following 16 orthogonal array types, which produced number 8 (A2B4 series) with a cogging torque of 1.08 Nm and an air gap flux density of 733 mTesla. One of the parameters apart from the cogging torque must be maintained is the air gap flux density. This variable affects the permeability of the motor so that later it will affect the amount of material used and the production costs of electric motors. The final result is a model that produces the lowest cogging torque while maintaining other parameters on the motor.

Optimization of air suspension system for improved ride and handling performance in road vehicles dynamic Armansyah, Armansyah; Keshavarzi, Ahmad; Kolahdooz, Amin; Ferdyanto, Ferdyanto; Mardhani, Muhammad Destri
Mechanical Engineering for Society and Industry Vol 4 No 2 (2024)
Publisher : Universitas Muhammadiyah Magelang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31603/mesi.11634

This study focused on the optimization of air suspension systems (ASs) for road vehicles concerning on-ride and handling criteria. A quarter DOF vehicle model is used in this study to develop an optimized system based on nonlinear equations. The extracted equations are then linearized and transformed into dimensionless form to gain insights into the system's behavior. By employing the Root-Mean-Square (RMS) method, the dimensionless equations are utilized to optimize the system parameters focused on stability and ride comfort. The five main components are attached in the model which consisted of the sprung mass (SM), unsprung mass (USM), gas spring (GS), auxiliary reservoir (AR), and orifice (O). The optimization procedure involved adjustment to the orifice resistance coefficient, air spring volume, air spring area, and auxiliary volume using the RMS-based method. Simulation analysis revealed the superior performance of the RMS-optimized system in both ride quality and handling. The study concludes by emphasizing the advantages of utilizing the RMS method for optimizing air suspension, resulting in decreased sprung mass acceleration and enhanced handling qualities. Selecting the appropriate design point for the suspension system based on the method outlined in this article can ensure both stability and comfort in the vehicle simultaneously.

Awareness Metode Pembelajaran Pasca Pandemi Covid-19 di SMKN 12 Jakarta Ferdyanto, Ferdyanto; Marbawi, Idris; Jannah, Miftahul; Patrick, Juan; Oktavia, Nana Triana; Firdaus, Talitha Fatiha; Julian, James; Tua, Lomo Mula
Jurnal Kreativitas Pengabdian Kepada Masyarakat (PKM) Vol 8, No 2 (2025): Volume 8 No 2 (2025)
Publisher : Universitas Malahayati Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33024/jkpm.v8i2.17486

ABSTRAK Semua kegiatan mulai terganggu akibat pandemi Covid-19 yang sedang berlangsung, terutama di sektor pendidikan. Pelayanan masyarakat ini kemudian diharapkan dapat menganalisis tingkat pemahaman guru terhadap beberapa metode pembelajaran yang diterapkan berdasarkan perspektif guru SMKN 12 JAKARTA sebelum dan setelah berbagi pengetahuan. Dalam kegiatan ini, metode yang digunakan adalah kualitatif, dengan implementasi teknis adalah survei SMKN 12 JAKARTA yang dihadiri oleh 40 guru. Kegiatan dimulai dengan distribusi pre-test kepada para guru, dilanjutkan dengan berbagi pengetahuan dan diskusi tanyajawab. Kemudian diakhiri dengan distribusi kuesioner (post-test). Data dalam kuesioner kemudian diproses menggunakan uji skala Likert, yang mendapatkan hasil yang berbeda untuk setiap pertanyaan. Dengan demikian, kesimpulan yang diperoleh adalah para guru sudah memahami dasar-dasar metode pembelajaran, sinkronus dan asinkronus. Selanjutnya, di masa depan, mereka dapat mampu menjalankan metode pembelajaran secara mandiri. Kata Kunci: Asinkronus, Kuesioner, Metode Pembelajaran, Pasca Covid-19, Sinkronus ABSTRACT All activities began to be disrupted due to the ongoing Covid-19 pandemic, especially in the education sector. This community service is later expected to be able to analyze the level of teacher understanding of several learning methods that are applied based on the perspective of the SMKN 12 JAKARTA teacher before and after sharing knowledge. In this activity, the method used was qualitative, with the technical implementation being the SMKN 12 JAKARTA survey which 40 teachers attended. The activity began with distributing pre-tests to the teachers, followed by knowledge sharing and question-and-answer discussions, and then ended with distributing questionnaires (post-test). The data in the questionnaire was then processed using the Likert scale test, in which different results were found for each question. Thus the conclusions obtained by the teachers already understand the basics of learning methods, synchronous and asynchronous. Furthermore, it will be able to run the learning method independently in the future. Keywords: Asynchronous, Learning Method, Post Covid-19, Questionnaire, Synchronous

Design And Performance Analysis of a Solar-Powered Boost Converter with Inductor Variations Controlled by Arduino Uno Hardian, Muhammad Paraj Azhar; Ferdyanto, Ferdyanto; Fatwa, Gumilang; Erlangga, Augusta
Jurnal Pendidikan Fisika dan Teknologi (JPFT) Vol 11 No 1 (2025): January-June
Publisher : Department of Physics Education, Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jpft.v11i1.7842

This research designs and makes an analysis of the performance of a solar panel-based DC-DC boost converter topology using an Arduino Uno microcontroller. Boost converter is given a variation of inductor wire with 30 turns and 60 turns using a diameter of 1 . This research was conducted to obtain the highest characteristics and efficiency of the performance of the boost converter that has been designed and made for each inductor wire turn variation. In this research, data analysis will be carried out, namely the effect of duty cycle on voltage and current, and how the effect of variations in the number of inductors turns on the efficiency of the boost converter. This circuit uses an arduino uno microcontroller to generate and control the duty cycle on pulse width modulation (PWM) to regulate and increase the desired output voltage. The inductor on the DC-DC boost converter with a wire variation of 60 turns at a diameter of 1 gets the highest efficiency with an average efficiency of 67.13 , while the inductor wire with 30 turns gets an average efficiency of 66.32 . The maximum voltage generated by the solar panel used as the main source of electrical energy in the boost converter is 20.0 and the control system that has been applied to the arduino uno microcontroller can control and generate a duty cycle with a ratio of 0 - 90 . The boost converter circuit made gets low efficiency due to the presence of MOSFET components that work in non-ideal conditions, which causes excessive power losses.

ANALYSIS OF COGGING TORQUE REDUCTION FROM DESIGN COMPUTATIONAL PERMANENT MAGNET SYNCHRONOUS MOTOR WITH TAGUCHI METHOD Wahyuni, Fitri; Julian, James; Ferdyanto, Ferdyanto; Fauzi, Ade Fikri
Jurnal Rekayasa Mesin Vol. 15 No. 1 (2024)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v15i1.1492

Permanent Magnet Synchronous Motor (PMSM) applications include electric vehicles, industrial pumps, wind turbines, aerospace technology, and many others. In this study, cogging torque is the central aspect of the discussion, which is the motor model, the thickness of the permanent magnet rotor, and the air gap in the electric motor influence. The Taguchi method uses parameter levels on the motor, which are divided into 16 types of orthogonal arrays, where the process is carried out twice in iterations. The first stage of simulation testing was to produce the primary model where number 4 (A1B4 series) was obtained as the most optimal motor model with a cogging torque of 1.56 Nm and an air gap flux density of 768 mTesla (mili tesla). Then the second test was to modify several parts of the motor with the following 16 orthogonal array types, which produced number 8 (A2B4 series) with a cogging torque of 1.08 Nm and an air gap flux density of 733 mTesla. One of the parameters apart from the cogging torque must be maintained is the air gap flux density. This variable affects the permeability of the motor so that later it will affect the amount of material used and the production costs of electric motors. The final result is a model that produces the lowest cogging torque while maintaining other parameters on the motor.

Analisis Daya Keluaran pada Kinerja Motor Listrik Tipe Synchronous Berbasis Komputasional Ferdyanto, Ferdyanto; Farha, Auditya; Julian, James; Wahyuni, Fitri; Rizal, Reda
TELKA - Telekomunikasi Elektronika Komputasi dan Kontrol Vol 9, No 2 (2023): TELKA
Publisher : Jurusan Teknik Elektro UIN Sunan Gunung Djati Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15575/telka.v9n2.107-116

Masalah yang menjadi pertimbangan dalam penggunaan motor listrik adalah daya keluaran yang dihasilkan pada saat motor bekerja. Penelitian ini berfokus pada analisis daya keluaran Permanent Magnet Synchronous Motor (PMSM) yang akan diuji pada kecepatan tertentu serta ditinjau terhadap perubahan sudut torsi tiap putaran. Tujuan penelitian ini adalah mendapatkan analisis daya keluaran dengan karakteristik yang stabil serta kinerja PMSM yang menghasilkan efisiensi sesuai standar. Penelitian menggunakan metode komputasi dengan model finite element analysis (FEA) yang dilakukan dengan menggunakan software. Hasil dari penelitian ini diperoleh performa PMSM dengan arus input sebesar 1.5 kA pada setiap fasa sehingga motor dapat beroperasi dengan kecepatan 13300 rpm serta menghasilkan torsi sebesar 164 Nm. Fluks magnet yang terbentuk berada dalam kondisi stabil dengan nilai 0.02 Wb dan membentuk distribusi medan magnet yang merata pada setiap kumparan stator. Rata-rata daya keluaran maksimum yang dihasilkan jangkar rotor adalah 107.6 kW pada sudut torsi 114°. Penelitian telah berhasil memperoleh analisis daya keluaran pada PMSM melalui metode komputasi. Hasil analisis tersebut dapat menjadi acuan dalam proses manufaktur PMSM. The problem that is considered in the use of electric motors is the output power generated when the motor is working. This research focuses on analyzing the output power of a Permanent Magnet Synchronous Motor (PMSM) which will be tested at a certain speed and looking at changes in torque angle for each rotation. The aim of this research is to obtain an output power analysis with stable characteristics and PMSM performance that produces efficiency according to standards. The research uses computational methods with finite element analysis (FEA) models which are carried out using software. The results of this research obtained PMSM performance with an input current of 1.5 kA in each phase so that the motor can operate at a speed of 13300 rpm and produce a torque of 164 Nm. The magnetic flux formed is in a stable condition with a value of 0.02 Wb and forms an even magnetic field distribution in each stator coil. The average maximum output power produced by the rotor armature is 107.6 kW at a torque angle of 114°. Research has succeeded in obtaining output power analysis on PMSM through computational methods. The results of this analysis can be used as a reference in the PMSM manufacturing process.

Performance Analysis of Permanent Magnet BLDC Motor for Reducing Cogging Torque Using Taguchi Method Ferdyanto, Ferdyanto; Fatwa, Gumilang; Erlangga, Augusta; Marbawi, Idris
ELKHA : Jurnal Teknik Elektro Vol. 16 No.1 April 2024
Publisher : Faculty of Engineering, Universitas Tanjungpura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26418/elkha.v16i1.76582

An electric motor is an electromagnetic machine commonly utilized across various industries and automotive products. One prevalent type of electric motor employed in electric vehicles is the Permanent Magnet Brushless DC Motor (PM-BLDC), a brushless motor employing permanent magnets. However, despite its efficiency, permanent magnet motors often experience vibrations that can disrupt their performance. This research aims to optimize the existing BLDC motor design, with a specific focus on reducing the existing cogging torque. Initially, the existing design exhibited a cogging torque level of 0.21482 Nm. The optimization process involved modifications to several key design parameters, such as air gap, magnet thickness, magnet type, and slot opening width. In previous research, only comparisons were made between stator slot designs, which proved to be less effective as significant differences were not evident in the results of the comparative analysis of BLDC motor designs. So, in this research, the Taguchi method was utilized for the optimization process due to several advantages it offers. Through an analysis of means and variance, the optimization process successfully achieved a significant reduction in cogging torque by 0.099744 and an increase in efficiency by 0.6%. The results of the optimized permanent magnet BLDC design indicated a cogging torque value of 0.115072 Nm and an efficiency of 86.64% at an operational motor speed of 1500 rpm. This research provides a substantial contribution to the development of more efficient electric motors suitable for various applications.

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