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All Journal Jurnal Edukasi Elektro Teknika Bulletin of Electrical Engineering and Informatics Elektrika
Murtianta, Budihardja
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Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Control & Systems Engineering Education Electrical & Electronics Engineering Engineering Industrial & Manufacturing Engineering

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Evaluasi Kinerja Sensor Proximity Induktif sebagai Alternatif Pengganti RFID pada Prototipe Rail Guided Vehicle Berbasis Arduino Santika, Maria Enggar; Prasetyo Dwi Nugroho, Muhamad; Murtianta, Budihardja
TEKNIKA Vol. 19 No. 2 (2025): Teknika Mei 2025
Publisher : Politeknik Negeri Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5281/zenodo.15435527

Abstract

Teknologi Rail Guided Vehicle (RGV) merupakan salah satu solusi otomasi transportasi material dalam lingkungan industri yang membutuhkan sistem navigasi dan identifikasi jalur secara presisi. Umumnya, sistem ini memanfaatkan Radio Frequency Identification (RFID) sebagai media deteksi posisi. Namun, penggunaan RFID memiliki beberapa kendala antara lain interferensi sinyal pada area dekat dengan logam serta kompleksitas saat diaplikasikan pada dunia industri yang beragam. Penelitian ini bertujuan untuk mengevaluasi kinerja sensor proximity induktif sebagai alternatif pengganti RFID dalam mendeteksi posisi pada prototipe RGV berbasis mikrokontroler Arduino. Pengujian dilakukan melalui serangkaian skenario pergerakan RGV pada lintasan dengan beberapa titik deteksi. Hasil penelitian menunjukkan bahwa sensor proximity induktif memberikan performa yang stabil dan akurat dengan mencapai rata-rata error sebesar 0,22 cm, yang lebih rendah dibandingkan dengan sensor RFID yang memiliki rata-rata error sebesar 0,56 cm serta tingkat akurasi deteksi terhadap objek logam di sepanjang rel RGV mencapai 98%.
Driver activity recognition using deep learning based on multi-step batch size up Utomo, Darmawan; Indria Prambodo, Natanael; Murtianta, Budihardja
Bulletin of Electrical Engineering and Informatics Vol 14, No 5: October 2025
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/eei.v14i5.9069

Abstract

The increasing popularity of electric motorbikes in Indonesia, while promoting sustainable mobility, also raises concerns regarding traffic safety. Given the high incidence of motorcycle-related accidents, there is a critical need for systems capable of monitoring and recognizing driver behavior. This study proposes a driver activity recognition system for electric motorbikes, utilizing an event data recorder (EDR) to capture seven key sensor signals: three-axis acceleration, voltage, current, power, and speed. A custom dataset was constructed using data collected from 10 subjects, each performing five driving activities including forward drive, brake, stop, left turn, and right turn for over three-minute intervals per activity. The classification model is based on a long short-term memory (LSTM) neural network. To optimize training efficiency, a multi-step batch size up (MSBU) strategy was introduced, which accelerates training time by 1.84× compared to a fixed batch size of 32. The best performance was achieved using a segment length of 75 time-steps, yielding an accuracy and macro F1-score of 0.9873. These results demonstrate the effectiveness of the proposed system for real-time driver behavior monitoring and activity recognition in electric motorbike applications.
PENGUAT KELAS D FREKUENSI TETAP ORDE 2 Murtianta, Budihardja; Susilo, Deddy
Jurnal Edukasi Elektro Vol. 6 No. 1 (2022): Jurnal Edukasi Elektro, Volume 6, Nomor 1, 2022
Publisher : DPTE FT UNY

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/jee.v6i1.44196

Abstract

ABSTRACT:The power amplifier determines the output power of the audio amplifier and in this part there will be heat dissipation which is proportional to the output power of the amplifier. To overcome the problem of the audio amplifier, a class D amplifier was designed. The amplifier designed in this paper is Power Amplifier Class D Fixed Frequency Second Order that uses a fixed frequency triangular signal generator and an order 2 low-pass filter. In this case, a power amplifier is designed for a subwoofer that has a frequency range of 20 Hz – 200 Hz because in the audio frequency range it requires relatively large power. The design of the power amplifier and its measurement using the Circuit Maker simulator. The amplifier can work to amplify signals with a maximum amplitude of 1 Vp and a frequency range of 20 Hz – 200 Hz. At a frequency of 20 Hz the shape of the signal is not as good as that of the 200 Hz frequency signal because it is far from the cut-off frequency of the low - pass filter, which is designed to be 250 Hz.ABSTRAK:Penguat daya menentukan besarnya daya keluaran penguat audio dan pada bagian ini akan terjadi disipasi panas yang sebanding dengan besar daya keluaran penguat. Untuk mengatasi permasalahan penguat audio tersebut dirancanglah penguat kelas D. Penguat yang di rancang pada tulisan ini adalah Penguat Kelas D Frekuensi Tetap Orde Dua yang menggunakan pembangkit sinyal segitiga frekuensi tetap dan tapis pelewat frekuensi rendah orde 2. Dalam hal ini dirancang penguat daya untuk subwoofer yang mempunyai jangkauan frekuensi 20 Hz – 200 Hz karena pada jangkauan frekuensi audio tersebut memerlukan daya relatif besar. Perancangan penguat daya dan pengukurannya menggunakan simulator Circuit Maker.  Penguat dapat bekerja memperkuat sinyal dengan amplitudo maksimum 1 Vp dan jangkauan frekuensi 20 Hz – 200 Hz. Pada frekuensi 20 Hz bentuk sinyal tidak sebaik  bentuk sinyal frekuensi 200 Hz karena jauh dari frekuensi penggal tapis pelewat frekuensi rendah yaitu dirancang 250 Hz.
PENGUAT KELAS D DENGAN METODE SUMMING INTEGRATOR Murtianta, Budihardja
Elektrika Vol. 11 No. 2 (2019): Oktober 2019
Publisher : Universitas Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (828.547 KB) | DOI: 10.26623/elektrika.v11i2.1693

Abstract

A class D amplifier is one in which the output transistors are operated as switches. When a transistor is off, the current through it is zero and when it is on, the voltage across it is small, ideally zero. Thus the power dissipation is very low, so it requires a smaller heat sink for the amplifier. Class D amplifier operation is based on analog principles and there is no digital encoding of the signal. Before the emergence of class D amplifiers, the standard classes were class A, class AB, class B, and class C. The classic method for generating signals driving a transistor MOSFET is to use a comparator. One input is driven by an incoming audio signal, and the other by a triangle wave or a sawtooth wave at the required switching frequency. The frequency of a triangular or sawtooth wave must be higher than the audio input. MOSFET transistors work in a complementary manner that operates as a switch. Triangle waves are usually generated by square waves fed to the integrator circuit. So the main part of processing audio signals into PWM (Pulse Width Modulation) is the integrator and comparator. In this paper, we will discuss the work of a class D amplifier system using the summing integrator method as its main part.
Penguat Jembatan dengan Untai Pembalik Fase Murtianta, Budihardja; Sari, Erlina
Elektrika Vol. 14 No. 2 (2022): October 2022
Publisher : Universitas Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26623/elektrika.v14i2.5329

Abstract

The maximum output voltage of the audio amplifier is limited to the magnitude of the power supply voltage of the power transistor or the operational amplifier on the final amplifier. This limits the maximum power of the audio amplifier output. The way to enlarge the output power of the audio amplifier without increasing the voltage is the bridge method or bridged modes. With this method a bridge amplifier will be generated. This Bridge Amplifier is also known as Bridge-Tied Load (BTL) or Bridged Transformerless. The principle of Bridge Amplifiers is to use a pair of final amplifiers whose outputs have opposite phase each other. There are 3 ways to make a pair of power amplifiers have opposing phases: with internal modification, with an audio transformer (phase splitting audio input transformer) and with a simple active phase reversal splitter circuit). This paper will discuss Bridge Amplifiers with simple phase inverting circuits. A pair of audio power amplifiers using two TDA2050 chips which are operated at ± 19 Volt supply voltage. The phase inverting circuit using IC TL072. Sinusoidal signal with an amplitude of 200 mVp and a frequency of 1 KHz is used as an input signal. The results to be observed and measured are gain, input, output and bandwidth of the bridged amplifier compared to the usual amplifier
Co-Authors Darmawan Utomo Deddy Susilo Indria Prambodo, Natanael Prasetyo Dwi Nugroho, Muhamad Santika, Maria Enggar Sari, Erlina