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All Journal Proceeding of the Electrical Engineering Computer Science and Informatics Jurnal Instrumentasi
Estiyanti Ekawati
Institut Teknologi Bandung
Agriculture, Biological Sciences & Forestry Chemistry Computer Science & IT Electrical & Electronics Engineering Engineering Materials Science & Nanotechnology

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Design of Regenerative Damper for Energy Harvester in Playground Seesaw Reyhan Ramadhan; Muhammad Ul Haq; Estiyanti Ekawati; Tri Prakosa
Proceeding of the Electrical Engineering Computer Science and Informatics Vol 7, No 1: EECSI 2020
Publisher : IAES Indonesia Section

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/eecsi.v7.2092

Abstract

Increasing demand for electricity, coupled with a greater understanding of the environmental impact of conventional power generation, has led to growing research interest on alternative energy sources. Energy harvesters based on playground equipment, such as the seesaw, has been proposed as an alternative method to generate electrical power. In this study, a new harvesting mechanism based on the electromagnetic regenerative damper is proposed as an alternative method to harness energy from a playground seesaw. The proposed design is intended for higher power output and efficiency, smaller dimensions, and ease of installation on a seesaw. Lab tests have been carried out to characterize the proposed design experimentally. The energy harvesting (stroke velocity-to-voltage) coefficient for the proposed seesaw-based energy harvester is obtained as 73.18 V/(ms -1 ). The regenerative damper is capable of producing up to 110 mW of power at 9.34% efficiency.
Optimasi Resolusi Spasial Citra Tomografi Impedansi Listrik untuk Identifikasi Model Fraktur Tulang Muhammad Akbar Nugrahadi; Estiyanti Ekawati; Reynanda Gemilang Surya Yudira; Imam Rakhmadi; Muhammad Rozaq Irfa’i; Syarifa Khairunnisa; Zulhendri Kamus; Deddy Kurniadi
Instrumentasi Vol 49, No 2 (2025)
Publisher : National Standardization Agency of Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31153/instrumentasi.v49i2.825

Abstract

Fraktur tulang adalah fenomena cedera yang kerap dialami atlet, dan membutuhkan deteksi segera agar mendapatkan perawatan yang tepat. Fraktur tulang yang tertutup membutuhkan bantuan deteksi karena tidak terlihat dari luar oleh mata manusia biasa. Untuk keperluan tersebut, penelitian ini memilih Tomografi Impedansi Listrik sebagai metode deteksi fraktur tulang tertutup. Metode ini memiliki keunggulan resolusi temporal yang tinggi, mobilitas mudah, harga relatif murah, dan tidak adanya efek ionisasi. Namun, resolusi spasialnya masih rendah. Karena itu, penelitian ini berupaya meningkatkan kualitas resolusi spasial rekonstruksi citra pada analisis Finite Elemet Method (FEM) dengan arus injeksi 0,3 mA dan frekuensi divariasikan pada rentang 200Hz – 150kHz, menerapkan algoritma Total Variation (TV), serta memvariasikan model mesh hingga diperoleh kombinasi yang optimal untuk meningkatkan resolusi spasial citra. Citra rekonstruksi pun melalui pengolahan citra untuk meningkatkan kontras pada deteksi anomali maupun fraktur. Secara kuantitatif, karakteristik rekonstruksi citra dievaluasi berdasarkan metrik resolusi spasial Coefficient of Contrast (COC) dan Contrast to Noise Ratio (CNR). Hasil uji menunjukkan bahwa frekuensi arus injeksi 5 kHz menghasilkan residual citra fraktur tulang paling optimal. Selanjutnya, resolusi spasial optimal dihasilkan oleh metode numerik Total Variation dengan mesh padat.
Co-Authors Deddy Kurniadi Imam Rakhmadi Muhammad Akbar Nugrahadi Muhammad Rozaq Irfa’i Muhammad Ul Haq Reyhan Ramadhan Reynanda Gemilang Surya Yudira Syarifa Khairunnisa Tri Prakosa Zulhendri Kamus