Analysis of acoustic cloaks for anti-sonar camouflage based on local resonance in acoustic metamaterials
Конференцијски прилог (Објављена верзија)
Метаподаци
Приказ свих података о документуАпстракт
Non-visual camouflage plays a significant role in the art of military deception. One of the fields of interest is auditory camouflage, where the goal is to remove the acoustic signature of an object, whether it is generated by the object itself or scattered from a surveillance device like sonar. A recently proposed approach to auditory camouflage is acoustic cloaking, where the object is made 'invisible' in acoustic sense by surrounding it with a cloak of acoustic metamaterial. Acoustic metamaterial is basically an artificial structure tailored to enable control of acoustic wave
dispersion through Bragg scattering, where the features of the structure have subwavelength dimensions. The operation of an acoustic cloak is based on negative effective dynamic mass and bulk modulus which can be obtained by local resonances. This leads to a possibility to fully tailor the path of acoustic waves (infrasound, audible waves or ultrasound) around the camouflaged object, effectively enabling one t...o make waves avoid the object and render it invisible. In this contribution we perform a full finite element modeling of the elements of an acoustic cloak, analyze it and consider coordinate transformation necessary to ensure acoustic concealment of a macroscopic object. We investigated spatial distribution of acoustic waves for two different scatterers, one of them being a cylindrical object with circular basis, another one a cylinder with elliptical basis. All our calculations were performed for a realistic sea water medium, modeled by an empirical formula. We considered the frequency dispersion of the acoustic field in
different spectral ranges, from infrasound to audible frequencies. For elliptic cloaks we applied a very simple approach that nevertheless furnished better acoustic cloaking than some more complex layered profiles previously published.
Кључне речи:
Acoustic camouflage / Acoustic metamaterials / Phononic crystals / Transformation acoustics / Acoustic cloakИзвор:
Proceedings - 6th International Scientific Conference on Defensive Technologies, OTEH 2014, 09-10 October 2014, Belgrade, 2014Издавач:
- Belgrade : The Military Technical Institute
Финансирање / пројекти:
- Микро, нано-системи и сензори за примену у електропривреди, процесној индустрији и заштити животне средине (RS-MESTD-Technological Development (TD or TR)-32008)
Институција/група
IHTMTY - CONF AU - Radulović, Katarina AU - Obradov, Marko AU - Vasiljević-Radović, Dana AU - Jakšić, Zoran PY - 2014 UR - https://cer.ihtm.bg.ac.rs/handle/123456789/5710 AB - Non-visual camouflage plays a significant role in the art of military deception. One of the fields of interest is auditory camouflage, where the goal is to remove the acoustic signature of an object, whether it is generated by the object itself or scattered from a surveillance device like sonar. A recently proposed approach to auditory camouflage is acoustic cloaking, where the object is made 'invisible' in acoustic sense by surrounding it with a cloak of acoustic metamaterial. Acoustic metamaterial is basically an artificial structure tailored to enable control of acoustic wave dispersion through Bragg scattering, where the features of the structure have subwavelength dimensions. The operation of an acoustic cloak is based on negative effective dynamic mass and bulk modulus which can be obtained by local resonances. This leads to a possibility to fully tailor the path of acoustic waves (infrasound, audible waves or ultrasound) around the camouflaged object, effectively enabling one to make waves avoid the object and render it invisible. In this contribution we perform a full finite element modeling of the elements of an acoustic cloak, analyze it and consider coordinate transformation necessary to ensure acoustic concealment of a macroscopic object. We investigated spatial distribution of acoustic waves for two different scatterers, one of them being a cylindrical object with circular basis, another one a cylinder with elliptical basis. All our calculations were performed for a realistic sea water medium, modeled by an empirical formula. We considered the frequency dispersion of the acoustic field in different spectral ranges, from infrasound to audible frequencies. For elliptic cloaks we applied a very simple approach that nevertheless furnished better acoustic cloaking than some more complex layered profiles previously published. PB - Belgrade : The Military Technical Institute C3 - Proceedings - 6th International Scientific Conference on Defensive Technologies, OTEH 2014, 09-10 October 2014, Belgrade T1 - Analysis of acoustic cloaks for anti-sonar camouflage based on local resonance in acoustic metamaterials UR - https://hdl.handle.net/21.15107/rcub_cer_5710 ER -
@conference{ author = "Radulović, Katarina and Obradov, Marko and Vasiljević-Radović, Dana and Jakšić, Zoran", year = "2014", abstract = "Non-visual camouflage plays a significant role in the art of military deception. One of the fields of interest is auditory camouflage, where the goal is to remove the acoustic signature of an object, whether it is generated by the object itself or scattered from a surveillance device like sonar. A recently proposed approach to auditory camouflage is acoustic cloaking, where the object is made 'invisible' in acoustic sense by surrounding it with a cloak of acoustic metamaterial. Acoustic metamaterial is basically an artificial structure tailored to enable control of acoustic wave dispersion through Bragg scattering, where the features of the structure have subwavelength dimensions. The operation of an acoustic cloak is based on negative effective dynamic mass and bulk modulus which can be obtained by local resonances. This leads to a possibility to fully tailor the path of acoustic waves (infrasound, audible waves or ultrasound) around the camouflaged object, effectively enabling one to make waves avoid the object and render it invisible. In this contribution we perform a full finite element modeling of the elements of an acoustic cloak, analyze it and consider coordinate transformation necessary to ensure acoustic concealment of a macroscopic object. We investigated spatial distribution of acoustic waves for two different scatterers, one of them being a cylindrical object with circular basis, another one a cylinder with elliptical basis. All our calculations were performed for a realistic sea water medium, modeled by an empirical formula. We considered the frequency dispersion of the acoustic field in different spectral ranges, from infrasound to audible frequencies. For elliptic cloaks we applied a very simple approach that nevertheless furnished better acoustic cloaking than some more complex layered profiles previously published.", publisher = "Belgrade : The Military Technical Institute", journal = "Proceedings - 6th International Scientific Conference on Defensive Technologies, OTEH 2014, 09-10 October 2014, Belgrade", title = "Analysis of acoustic cloaks for anti-sonar camouflage based on local resonance in acoustic metamaterials", url = "https://hdl.handle.net/21.15107/rcub_cer_5710" }
Radulović, K., Obradov, M., Vasiljević-Radović, D.,& Jakšić, Z.. (2014). Analysis of acoustic cloaks for anti-sonar camouflage based on local resonance in acoustic metamaterials. in Proceedings - 6th International Scientific Conference on Defensive Technologies, OTEH 2014, 09-10 October 2014, Belgrade Belgrade : The Military Technical Institute.. https://hdl.handle.net/21.15107/rcub_cer_5710
Radulović K, Obradov M, Vasiljević-Radović D, Jakšić Z. Analysis of acoustic cloaks for anti-sonar camouflage based on local resonance in acoustic metamaterials. in Proceedings - 6th International Scientific Conference on Defensive Technologies, OTEH 2014, 09-10 October 2014, Belgrade. 2014;. https://hdl.handle.net/21.15107/rcub_cer_5710 .
Radulović, Katarina, Obradov, Marko, Vasiljević-Radović, Dana, Jakšić, Zoran, "Analysis of acoustic cloaks for anti-sonar camouflage based on local resonance in acoustic metamaterials" in Proceedings - 6th International Scientific Conference on Defensive Technologies, OTEH 2014, 09-10 October 2014, Belgrade (2014), https://hdl.handle.net/21.15107/rcub_cer_5710 .
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