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Practical Numerical Acoustics
Published in David A. Bies, Colin H. Hansen, Carl Q. Howard, Engineering Noise Control, 2018
David A. Bies, Colin H. Hansen, Carl Q. Howard
In the high-frequency region, a method generally known as statistical energy analysis (SEA) (Lyon, 1975; Lyon and DeJong, 1995; Sablik, 1985) is used to calculate the flow and storage of vibration and acoustic energy in a complex system. The total sound power radiated by a particular structure is calculated by summing that due to each of the individual panels or parts making up the structure.
Practical Numerical Acoustics
Published in David A. Bies, Colin H. Hansen, Engineering Noise Control, 2017
In the high frequency region, a method generally known as statistical energy analysis (SEA) is used (Lyon, 1975; Sablik, 1985) to calculate the flow and storage of vibration and acoustic energy in a complex system. The total sound power radiated by a particular structure is calculated by summing that due to each of the individual panels or parts making up the structure.
ij: laboratory measurements versus predictions EN 12354-1
Published in J. Carmeliet, H. Hens, G. Vermeir, Research in Building Physics, 2020
C. Crispin, M. Blasco, B. Ingelaere, M. Van Damme
The SEA method (Statistical Energy Analysis) is used to quantify the energy of vibrating systems and the power flow between several of these systems. It describes the properties of the systems with statistical quantities. The SEA method is restricted to frequencies above the critical frequency.
A practical optimisation method of submarine base considering vibration reduction, light-weight and shock resistance
Published in Ships and Offshore Structures, 2022
Xinhao Zhao, Yuchao Yuan, Wenyong Tang
Since the sound wave is a carrier that can effectively transmit information over long distances in seawater, submarine underwater noise has become the main factor affecting its stealthiness. The radiated noise is usually calculated by the finite element and boundary element method (FE-BEM), finite element and infinite element method (FE-IFEM) and statistical energy analysis (SEA). In the high-frequency range, SEA can describe the evolution of vibration energy by associating the energy between subsystems with the energy from external sources through algebraic equations (Oliveira 2021). In the medium-frequency range, the traditional SEA method is no longer applicable, and the FE method is costly in calculating the medium frequency noise (Langley and Bremner 1999). Therefore, the hybrid finite element-statistical energy analysis (FE-SEA) is proposed to solve this problem (Ohayon and Soize 1997; Fazzolari and Tan 2020 ) . For the low-frequency range, it is difficult to simulate the unbounded problem of underwater acoustic radiation only by the finite element method. In solving the problem of low-frequency underwater noise, FE-BEM has the characteristics of small modelling scale, high efficiency and high accuracy (Wu and Chen 2017; Zhang et al. 2019). In addition, some scholars use the simplified-estimation method to predict underwater sound radiation rapidly, which can meet the requirements of engineering accuracy (Zhang et al. 2020).
Vibroacoustic performance assessment of aircraft panels in low, mid and high frequency regimes
Published in Mechanics of Advanced Materials and Structures, 2022
B. Balakrishnan, Amirtham Rajagopal, S. Raja
In the present work, therefore, VA performance of aircraft panels made up aluminum, composites and fiber metal laminates are evaluated using infinite duct numerical modeling scheme in the three frequency regimes. A vibroacoustic test facility is designed and developed to measure the STL of aluminum panel, and further, the test results are compared with the VA simulation results. VA procedure is validated using FEM, where a numerical model of the infinite duct with an aluminum panel placed in between the sender and receiver chamber is modeled, and the procedure is validated with the literature. The mid-frequency and high-frequency analysis are carried using the boundary element method and statistical energy analysis methods, respectively, to evaluate the vibroacoustic behavior of aircraft panels in different frequency bands.
An interval statistical energy method for high-frequency analysis of uncertain structural–acoustic coupling systems
Published in Engineering Optimization, 2020
J. H. Dong, F. W. Ma, Y. D. Hao, C. S. Gu
Acoustic problems can be divided into three categories: low frequency (<200 Hz), medium frequency (200–500 Hz) and high frequency (>500 Hz) (Ma 2002). Discrete techniques are suitable for solving mid- to low-frequency acoustic problems and include the finite element method (Dhandole and Modak 2010) and boundary element method (Wu and Ochmann 2002). Energy methods, such as the energy finite element method (Gao, Zhang, and Kennedy 2018) and statistical energy analysis (SEA) (Crocker and Price 1969), are suitable for solving high-frequency acoustic problems. SEA, developed in the early 1960s, is an effective method for modelling high-frequency vibrations. The SEA method has been successfully applied to space launch vehicles, satellites, spacecraft, helicopters, ships, construction equipment and automobiles (Bergen and Badilla 1991; Li et al.2015; Culla et al.2016).