Characteristics and use of a nonlinear end-fired array for acoustics in air
Başlık çevirisi mevcut değil.
- Tez No: 401444
- Danışmanlar: DR. ANDRES LARRAZA, DR. BRUCE C. DENARDO
- Tez Türü: Yüksek Lisans
- Konular: Elektrik ve Elektronik Mühendisliği, Fizik ve Fizik Mühendisliği, Electrical and Electronics Engineering, Physics and Physics Engineering
- Anahtar Kelimeler: Belirtilmemiş.
- Yıl: 2007
- Dil: İngilizce
- Üniversite: The Naval Postgraduate School
- Enstitü: Yurtdışı Enstitü
- Ana Bilim Dalı: Optik Mühendisliği Ana Bilim Dalı
- Bilim Dalı: Belirtilmemiş.
- Sayfa Sayısı: 82
Özet
Özet yok.
Özet (Çeviri)
The parametric array exploits two highly collimated ultrasound beams interacting in a given volume producing a single beam with very high directivity and almost no side lobes. The high directivity of the difference frequency signal of the parametric array is due to the interaction of the waves in the volume effectively producing a virtual end-fired array boosting pressure levels along the interaction region which is limited by the absorption coefficient. This thesis focuses on experiments conducted in an anechoic room using AS-18-B Audio Spotlight system from HolosonicTM. Furthermore, nonlinear theory was modeled by a linear discrete array. The beam pattern of the parametric loudspeaker, range dependence of primary and secondary signals and total harmonic distortion (THD) were measured and then compared to theory. Experimental data for the beam pattern of the parametric loudspeaker agreed with the theory. It was also shown that the parametric array had a very narrow beam width and almost no side lobes as opposed to conventional loudspeakers. Both primary waves and difference wave frequency signals were examined for their range dependence. Due to the complicated interference of the primary waves, it was impossible to compare experimental results with theoretical predictions. For the difference wave signals, experimental data was verified by theory, which was modified in order to accommodate both wave generation and the spreading region. Finally, THD of the parametric loudspeaker was measured for different amplitude modulation depths. Experimental results showed that preprocessing should be applied in order to decrease THD and achieve clean audio signal reproduction.
Benzer Tezler
- Novel cochlear electrode array development using microfabrication techniques
Mikrofabrikasyon teknikleri kullanılarak yenilikçi koklear elektrot dizini geliştirilmesi
GÜLÇİN ŞEFİYE AŞKIN
Doktora
İngilizce
2024
Makine MühendisliğiHacettepe ÜniversitesiNanoteknoloji ve Nanotıp Ana Bilim Dalı
DOÇ. DR. BİLSAY SÜMER
- Sürekli mıknatıslar ve mıknatıslayıcılar
Başlık çevirisi yok
BORA NALBANTOĞLU
Yüksek Lisans
Türkçe
1996
Elektrik ve Elektronik Mühendisliğiİstanbul Teknik ÜniversitesiPROF.DR. İLHAMİ ÇETİN
- Dinamik çarpma problemlerinde malzeme seçiminin önemi
İmportance of the material selection in impact problems
REYHAN UYAN ÖZSOYSAL
- Esnek mekanizmaların tasarlanması ve kontrolü
Design and control of compliant mechanisms
AYŞE TEKEŞ
Doktora
Türkçe
2013
Makine Mühendisliğiİstanbul Teknik ÜniversitesiMakine Mühendisliği Ana Bilim Dalı
DOÇ. DR. MEHMET SALIH DOKUZ
- A stress testıng framework for the Turkısh bankıng sector: an augmented approach
Türk bankacılık sektörü için bir stres testi çerçevesi: Bir genişletilmiş yaklaşım
BAHADIR ÇAKMAK
Doktora
İngilizce
2014
BankacılıkOrta Doğu Teknik Üniversitesiİktisat Ana Bilim Dalı
PROF. DR. NADİR ÖCAL