Sains Malaysiana 44(12)(2015): 1701–1706
Radar Return Reduction for Wind Turbines using Bump Structures
(Pengurangan Radar Pantulan Gelombang
untuk Kincir Angin Menggunakan Struktur Bonggol)
SHYH-KUANG UENG*1 & YAO-HONG CHAN1, WEI-HSIEN LU2 & HENG-WEN CHANG2
1Department of
Computer Science & Engineering, National Taiwan Ocean University, Keelung
City 202, Taiwan
2Green Energy and
Environment Research Laboratories, ITRI, Chung Hsin Rd., Chutung, Hsinchu, Taiwan
Diserahkan: 11 Ogos 2014/Diterima: 23 Jun 2015
ABSTRACT
Wind turbines are massive electrical structures. They produce large
returns when illuminated by radar waves. These scatterings have
a great impact on the operation of surveillance, air traffic control
and weather radars. This paper presents two geometric modelling
methods for reshaping wind turbine towers so that the Radar Cross
Section (RCS)
of wind turbines is reduced. In the proposed reshaping methods,
bump structures are created on the surface of the conventional cylinder
wind turbine tower. When a reshaped tower is illuminated by radar
waves, the bump structures scatter incident radar waves into insignificant
directions so that the strength of back-scattering is declined and
the RCS of the wind turbine is decreased.
The test results confirmed that the proposed methods significantly
reduce bi-static RCS values of wind turbines. The proposed reshaping methods
are practical, flexible and effective in alleviating the scatterings
of wind turbines.
Keywords: Radar cross section; reshaping method; stealthy
technology; wind turbine
ABSTRAK
Kincir angin merupakan struktur elektrik yang besar. Ia menghasilkan
pantulan gelombang radar yang besar apabila dipancarkan. Taburan
ini memberi kesan yang besar terhadap operasi pengawasan, kawalan
trafik udara dan radar udara. Kajian ini menjelaskan dua kaedah
pemodelan geometri untuk rekaan semula bentuk menara kincir angin
supaya Keratan Rentas Radar (RCS)
angin dikurangkan. Dalam kaedah yang dicadangkan, struktur bonggol
diletakkan di atas permukaan silinder menara kincir angin biasa.
Apabila menara kincir angin dipancarkan dengan gelombang radar,
bonggol menyelerakkan gelombang tersebut ke pelbagai arah. Jadi
kekuatan serakan balik berkurang dan keratan rentas radar kincir
angin turut berkurang. Hasil ujian menunjukkan, keratan rentas radar
dwi-statik kincir angin telah dikurangkan dengan banyak. Kaedah
ini adalah praktikal, fleksibel dan efektif bagi mengurangkan serakan
balik kincir angin.
Kata
kunci: Kaedah pembentukan semula; keratan rentas radar; kincir angin; teknologi
stealthy
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*Pengarang untuk
surat-menyurat; email: skueng@mail.ntou.edu.tw
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