Article Per Year (5 Year)
p-Index From 2021 - 2026
0
P-Index
This Author published in this journals
All Journal Journal of Aero Technology
Angga Dwi Saputra
BBTA3, BPPT

Published : 2 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 2 Documents
Search

 1 
Kajian Eksperimental Soft Flutter Pada Model Seksional Jembatan Angga Dwi Saputra; Syariefatunnisa Syariefatunnisa
Journal of Aero Technology Vol. 1 No. 2 (2018): Juni 2018
Publisher : BPPT

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29122/joat.v1i2.3068

Abstract

Aeroelastic testing of a sectional bridge model in a wind tunnel with scale 1:20 had been conducted. The model was tested to study the characterictis of aeroelastics dynamic, such as Vortex Induced Vibration (VIV) and flutter. Based on the testing, phenomenon soft flutter was found in the test. Soft flutter has different characteristics as classical or hard flutter. In hard flutter, there are  obvious divergence point, which is the point of wind speed when  the amplitude increases suddenly and might be catastrophic. In soft  flutter phenomenon, the vibration amplitude increases gradually as increasing of wind speed. In this paper, the characteristics of soft flutter on a model will be described and the method to determine its critical flutter speed.Keywords: Aeroelastic, flutter, divergence, critical flutter speedAbstrakPengujian aeroelastika di terowongan angin pada model seksional jembatan dengan skala 1:20 dilakukan untuk mengetahui karakteristik aeroelastika dinamik, yaitu Vortex Induced Vibration (VIV) dan flutter. Berdasarkan hasil pengujian terlihat fenomena flutter yang terjadi adalah soft flutter. Fenomena soft flutter berbeda dengan classical flutter atau hard flutter, dimana pada hard flutter terdapat titik divergen yang jelas. Pada hard flutter titik divergen ditandai dengan naiknya amplitudo menjadi sangat besar secara tiba-tiba dan dapat mengakibatkan kerusakan yang fatal. Pada soft flutter amplitudo getaran akan meningkat secara bertahap dengan bertambahnya kecepatan angin. Makalah membahas karakteristik soft flutter yang terjadi dan metode untuk menentukan kecepatan kritis flutter.Kata kunci : Aeroelastika, flutter, divergen, kecepatan kritis flutter
Prediksi Parameter Redaman Sinyal Respon Dinamik Menggunakan Metoda LSCE dengan Bahasa Python Arizal Akbar Zikri; Angga Dwi Saputra
Journal of Aero Technology Vol. 1 No. 2 (2018): Juni 2018
Publisher : BPPT

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29122/joat.v1i2.3069

Abstract

In the aeroelastic test on flight test or wind tunnel, damping is a critical paramater to determine boundary flutter speed. Therefore, We need accurate and effective  methods to extract damping. Damping parameter were obtained by extraction dynamic response signals of structure under test. Least Square Complex Exponential (LSCE) are used for extracting damping value. Analyzed signals was a transient signal which is simulated by python in certain damping and frequency value. The final results for damping value are compared between python and matlab.Keywords: damping, flutter, structure, aeroelastic, extractionAbstrakPada pengujian aeroelastik pada uji terbang  atau terowongan angin, redaman merupakan parameter yang kritikal  untuk menentukan batas kecepatan flutter.  Untuk itu dibutuhkan metode ekstraksi nilai redaman yang akurat dan efektif. Nilai redaman didapatkan dari ekstraksi respon dinamik struktur yang diuji. Metode ekstraksi yang digunakan, yaitu Least Square Complex Exponential (LSCE). Data yang dianalisis merupakan sinyal transien yang disimulasikan melalui pemrograman python dengan nilai parameter redaman dan frekuensi tertentu. Hasil perhitungan redaman menggunakan python dibandingkan dengan matlab. Kata kunci : redaman, flutter, struktur, aeroelastik, ekstraksi
Co-Authors Arizal Akbar Zikri Syariefatunnisa Syariefatunnisa