In this paper, the isogeometric analysis (IGA) is employed to develop an acoustic radiation model for a double plate-acoustic cavity coupling system, with a focus on analyzing the sound transmission loss (STL). The fu...In this paper, the isogeometric analysis (IGA) is employed to develop an acoustic radiation model for a double plate-acoustic cavity coupling system, with a focus on analyzing the sound transmission loss (STL). The functionally graded (FG) plate exhibits a different material properties in-plane, and the power-law rule is adopted as the governing principle for material mixing. To validate the harmonic response and demonstrate the accuracy and convergence of the isogeometric modeling, ANASYS is utilized to compare with numerical examples. A plane wave serves as the acoustic excitation, and the Rayleigh integral is applied to discretize the radiated plate. The STL results are compared with the literature, confirming the reliability of the coupling system. Finally, the investigation is conducted to study impact of cavity depth and power-law parameter on the STL.展开更多
Based on the fundamental dynamic equations of functionally graded material (FGM) cylindrical shell, this paper investigates the sound radiation of vibrational FGM shell in water by mobility method. This model takes in...Based on the fundamental dynamic equations of functionally graded material (FGM) cylindrical shell, this paper investigates the sound radiation of vibrational FGM shell in water by mobility method. This model takes into account the exterior fluid loading due to the sound press radiated by the FGM shell. The FGM cylindrical shell was excited by a harmonic line radial force uniformly distributing along the generator. The FGM shell equations of motion, the Helmholtz equation in the exterior fluid medium and the continuity equation at fluid-shell interface are used in this vibroacoustic problem. The expressions of sound radiation efficiency and sound field of the FGM shell have been derived by mobility method. Radiation efficiency, modal mobility and the directivity pattern of the sound field are solved numerically. In particular, radiation efficiency and directivity pattern with various power law index are analyzed.展开更多
Hardware based neuromorphic sensory system has attracted great attention for cognitive interactive platform.Auditory perception system can capture and analyze various sound signals,helping us to detect dangerous surro...Hardware based neuromorphic sensory system has attracted great attention for cognitive interactive platform.Auditory perception system can capture and analyze various sound signals,helping us to detect dangerous surroundings and judge environmental conditions.Therefore,developing neuromorphic auditory system that can decode auditory spatiotemporal information would be interesting.Here,an artificial auditory perceptual system is proposed by integrating sound frequency sensitive triboelectric nanogenerators(SFS-TENGs)and oxide based ionotronic neuromorphic transistor.With perforated configuration,the SFS-TENG adopting polyetheretherketone membrane and polytetrafluoroethylene membrane as friction layers can convert sound wave signals into electrical signals,exhibiting a high sensitivity of~2.24 V/dB and good durability.The neuromorphic transistor can further process electrical signals generated by SFS-TENG.Thus,the system can mimic auditory perception,exhibiting a wide range of sound pressure and frequency recognition capabilities.Information encryption/decryption and Doppler frequency shift temporal information processing are demonstrated on the TENG based auditory system for the first time.The present auditory perceptual system demonstrates broad application prospects,providing new opportunities to create sophisticated,adaptable,and interactive systems.展开更多
文摘In this paper, the isogeometric analysis (IGA) is employed to develop an acoustic radiation model for a double plate-acoustic cavity coupling system, with a focus on analyzing the sound transmission loss (STL). The functionally graded (FG) plate exhibits a different material properties in-plane, and the power-law rule is adopted as the governing principle for material mixing. To validate the harmonic response and demonstrate the accuracy and convergence of the isogeometric modeling, ANASYS is utilized to compare with numerical examples. A plane wave serves as the acoustic excitation, and the Rayleigh integral is applied to discretize the radiated plate. The STL results are compared with the literature, confirming the reliability of the coupling system. Finally, the investigation is conducted to study impact of cavity depth and power-law parameter on the STL.
基金supported by the Key Project of the National Natural Science Foundation of China (10932006)Hebei Natural Science Foundation (2011210055)Hebei Key Basic Research Project (10963528D)
文摘Based on the fundamental dynamic equations of functionally graded material (FGM) cylindrical shell, this paper investigates the sound radiation of vibrational FGM shell in water by mobility method. This model takes into account the exterior fluid loading due to the sound press radiated by the FGM shell. The FGM cylindrical shell was excited by a harmonic line radial force uniformly distributing along the generator. The FGM shell equations of motion, the Helmholtz equation in the exterior fluid medium and the continuity equation at fluid-shell interface are used in this vibroacoustic problem. The expressions of sound radiation efficiency and sound field of the FGM shell have been derived by mobility method. Radiation efficiency, modal mobility and the directivity pattern of the sound field are solved numerically. In particular, radiation efficiency and directivity pattern with various power law index are analyzed.
基金granted by the National Natural Science Foundation of China(No.U22A2075)Ningbo Key Scientific and Technological Project(No.2021Z116).
文摘Hardware based neuromorphic sensory system has attracted great attention for cognitive interactive platform.Auditory perception system can capture and analyze various sound signals,helping us to detect dangerous surroundings and judge environmental conditions.Therefore,developing neuromorphic auditory system that can decode auditory spatiotemporal information would be interesting.Here,an artificial auditory perceptual system is proposed by integrating sound frequency sensitive triboelectric nanogenerators(SFS-TENGs)and oxide based ionotronic neuromorphic transistor.With perforated configuration,the SFS-TENG adopting polyetheretherketone membrane and polytetrafluoroethylene membrane as friction layers can convert sound wave signals into electrical signals,exhibiting a high sensitivity of~2.24 V/dB and good durability.The neuromorphic transistor can further process electrical signals generated by SFS-TENG.Thus,the system can mimic auditory perception,exhibiting a wide range of sound pressure and frequency recognition capabilities.Information encryption/decryption and Doppler frequency shift temporal information processing are demonstrated on the TENG based auditory system for the first time.The present auditory perceptual system demonstrates broad application prospects,providing new opportunities to create sophisticated,adaptable,and interactive systems.
