Analysis of the external radiation from circular cylindrical shells

Aslani, Pegah; Sommerfeldt, Scott D.; Blotter, Jonathan D.

doi:10.1016/j.jsv.2017.07.021

Cited by 10 publications

(5 citation statements)

References 22 publications

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“…Radiation modes corresponding to external radiation from a cylindrical shell are used to calculate the radiated sound power numerically. 22 They are also used in monitoring the radiation mode amplitudes before and after control in order to better understand the mechanism of sound power reduction using the WSSG control metric. For experimental results, the ISO-3741 standard has been used to estimate the radiated sound power in a reverberation chamber using six microphones.…”

Section: Quantifying the Control Performancementioning

confidence: 99%

“…For further discussion on radiation modes for cylindrical shells the reader is referred to Ref. 22. Figure 7 shows the ten most efficient radiation modes at a frequency of 290.23 Hz associated with the (1,1) structural mode.…”

Section: A Acoustic Radiation Before and After Controlmentioning

confidence: 99%

“…The radiation modes for a cylindrical shell are noticeably different than for a flat plate, which also raised the question as to whether the WSSG method would be as effective as it is for flat structures. 22 The WSSG control metric also exhibits relatively little spatial variance which means that there is little dependence on the error sensor location, making the method rather robust. It is shown that the WSSG control metric is able to provide near optimal solutions, in comparison to methods that use global measurements.…”

Section: Introductionmentioning

confidence: 99%

“…The radiated sound power has been calculated numerically using the radiation resistance matrix for the external radiation from cylindrical shells. 22 In order to estimate the radiated sound power experimentally, the ISO-3741 standard was used. It is shown that there is little dependence on the error sensor location.…”

Section: Introductionmentioning

confidence: 99%

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Active control of simply supported cylindrical shells using the weighted sum of spatial gradients control metric

Aslani

Sommerfeldt

Blotter

2018

The Journal of the Acoustical Society of America

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It is often desired to reduce sound radiated from cylindrical shells. Active structural acoustic control (ASAC) provides a means of controlling the structural vibration in a manner to efficiently reduce the radiated sound. Previous work has often required a large number of error sensors to reduce the radiated sound power, and the control performance has been sensitive to the location of error sensors. The ultimate objective is to provide global sound power reduction using a minimal number of local error measurements, while also minimizing any dependence on error sensor locations. Recently, a control metric referred to as weighted sum of spatial gradients (WSSG) was developed for ASAC. Specific features associated with WSSG make this method robust under a variety of conditions. In this work, the WSSG control metric is extended to curved structures, specifically a simply supported cylindrical shell. It is shown that global attenuation of the radiated sound power is possible using only one local error measurement. It is shown that the WSSG control metric provides a solution approximating the optimal solution of attenuating the radiated sound power, with minimal dependence on the error sensor location. Numerical and experimental results are presented to demonstrate the effectiveness of the method.

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Section: Quantifying the Control Performancementioning

confidence: 99%

Section: A Acoustic Radiation Before and After Controlmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Active control of simply supported cylindrical shells using the weighted sum of spatial gradients control metric

Aslani

Sommerfeldt

Blotter

2018

The Journal of the Acoustical Society of America

Self Cite

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“…The shell vibration is described based on the Flugge and Laplace equations, and the boundary element method solves the far-field acoustic radiation. Aslani et al [13] gives a radiation mode of an external radiating cylinder that considers axial and circumferential dependence, more naturally matching the geometry. Caresta [14] used the wave propagation method and the power series method to study the specific response of the submarine model with a conical shell at both ends and a cylindrical shell in the middle.…”

Section: Introductionmentioning

confidence: 99%

Vibro-Acoustic Analysis of an Underwater Cylindrical Shell with Internal Structures and a Comparison with Experiment

Chen,

Li,

Chen

2023

J. Mod. Mech. Eng. Technol.

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In this work, the low-frequency vibration response and full-band acoustic radiation characteristics of an underwater reinforced cylindrical shell with internal structures are studied by combining the FEM with SEA. The stiffened cylindrical shell contains internal structures such as the F-shape plates and the support valve frames. The exciting sources have two different exciting forces corresponding to two experimental conditions. In the low-frequency band, the FEM was employed, and in the medium and high-frequency bands, the SEA was used. A comparison of the numerical results and the experiment shows that they agree well. The FEM and SEA give better results at [1,1k] Hz and [1k,10k] Hz, respectively. Due to mesh quality limitations, the FEM is not favorable for medium and high-frequency calculations. The SEA focuses on the structural mean power flow but cannot obtain position-specific vibrational responses. The results show that the internal excitation source mainly causes the structural vibration and sound radiation and are closely related to the free vibration characteristics of the structure. In addition, with the increase in frequency, the circumferential sound pressure level of the underwater structure has more substantial directivity.

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Acoustic model of ceramic angular contact ball bearing based on multi-sound source method

Yan

Sun

et al. 2019

Nonlinear Dyn

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Analysis of the external radiation from circular cylindrical shells

Cited by 10 publications

References 22 publications

Active control of simply supported cylindrical shells using the weighted sum of spatial gradients control metric

Active control of simply supported cylindrical shells using the weighted sum of spatial gradients control metric

Vibro-Acoustic Analysis of an Underwater Cylindrical Shell with Internal Structures and a Comparison with Experiment

Acoustic model of ceramic angular contact ball bearing based on multi-sound source method

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