Sound-insulting performance of origami-based sandwich trusscore panels

Ishida, Shigemi; Morimura, Hiroaki; Hagiwara, Ichiro

doi:10.1090/mbk/095.2/06

Cited by 2 publications

(6 citation statements)

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“…In the previous paper [16], the problem [14,15] in which the difference of 6db was generated in FEM compared to the mass law of sound insulation was clarified by assuming that the incident wave and the reflected wave are equal in the flat plate model because it was difficult to separate the forward and the backward waves with the FEM. To generalize the separation method of the Helmholtz solution obtained by FEM into the incident wave and the reflected wave, we tried to develop a new method giving the FEM solution as a boundary condition to the differential decomposition expressed by the sum of the forward and the backward waves because in an acoustic tube with an extremely long one-dimensional direction, which can be regarded as one-dimensional behavior in the tube direction [17].…”

Section: Discussionmentioning

confidence: 99%

Section: Calculation Methods For Sound Insulation Characteristics Eva...mentioning

confidence: 99%

“…In the model proposed by Ishida et al [14,15], the other end of the sound receiving side is set to be in the perfectly reflective condition. Determination of the cause of the difference between the theoretical and simulated values was described as a task for future work [14,15]. The main cause of this difference was the failure to recognize that although the pressure is expressed using a combination of the forward waves and the backward waves when the Helmholtz equation representing the sound field is solved directly in the time domain, it is simply obtained as the sum of these waves in the FEM.…”

Section: Calculation Methods For Sound Insulation Characteristics Eva...mentioning

confidence: 99%

“…In other words, the transmission loss is defined using the forward wave sound pressure on the receiving side with respect to the forward wave sound pressure on the sound source side. However, in the previous studies [14,15], the sound pressure on the sound source side that was determined by the FEM was used as the forward wave sound pressure on the sound source side.…”

Section: Calculation Methods For Sound Insulation Characteristics Eva...mentioning

confidence: 99%

“…As shown in these papers, there are no FEM papers for corresponding to the original definition of transmission loss. And so, this was examined using FEM by the second author et al [14,15], but a correction value was required to ensure that the results corresponded to the theoretical values. In addition, because the correction values differ depending on the type of test piece involved [14,15], it is difficult to produce a quantitative measure of how much the sound insulation performance is improved in the case of a plate with cores when compared with a flat plate alone by using this type of simulation.…”

Section: Introductionmentioning

confidence: 99%

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Development of New Sound Insulation Simulation Technology Using Finite Element Method for Efficiency of High Aspect Ratio Core in Low Frequency Range

Aya¹,

Hagiwara²

2022

IJMEA

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Nowadays, meta-materials are being studied to reduce vehicle interior noise. But it has not yet been found effective meta-materials at low frequencies below 500Hz. A panel with one core which has an excellent sound insulation where the higher the height of the core, the better the sound insulation characteristics have been founded. And so, depending on the core height, a structure with one core which is effective even at 500hz or less may be obtained. If the core height is high, it cannot be obtained by press forming, so the origami forming has been developed. Use of FEM which is versatile for shape of structure is effective for analysis of the plate with core or with sound absorbing material. Although the FEM analysis for sound insulation analysis was difficult, so far, two methods have been developed. Here these two methods to a flat plate and a flat plate with sound absorbing material to grasp their characteristics are compared and applied. And then the more versatile method is selected for sound insulation analysis to plates with one core which are formed by origami forming. As a result, it is shown that a plate with one core is effective for sound insulation characteristics at the low frequency below 500Hz depending on the balance between plate thickness and core height. At last, it is shown the core shape that maximizes the integral value of the sound insulation characteristic from 0 Hz to 500 Hz by an optimal analysis.

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Section: Discussionmentioning

confidence: 99%

Section: Calculation Methods For Sound Insulation Characteristics Eva...mentioning

confidence: 99%

Section: Calculation Methods For Sound Insulation Characteristics Eva...mentioning

confidence: 99%

Section: Calculation Methods For Sound Insulation Characteristics Eva...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Development of New Sound Insulation Simulation Technology Using Finite Element Method for Efficiency of High Aspect Ratio Core in Low Frequency Range

Aya¹,

Hagiwara²

2022

IJMEA

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Reconfigurable origami silencers for tunable and programmable sound attenuation

Fang

2018

Smart Mater. Struct.

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Recent research has discovered that origami-inspired structures possess great versatility in properties and functionalities. In this research, through an integration of origami geometry and duct acoustics, we reveal that the folding-induced shape reconfiguration of a modular origami silencer could yield great tunability and programmability in sound attenuation. This has been made possible through exploring the kinematics of the folding and the extensibility of the modular origami. Numerical and experimental results indicate that by reconfiguring the silencer via a single degree-of-freedom folding mechanism, the sound attenuation bandwidth can be effectively tuned. Meanwhile, based on a comprehensive understanding on the correlations between the origami geometries and the acoustic characteristics, we exemplify that, by incorporating multiple origami layers in a silencer and by programming their geometries, ondemand sound control can be achieved, e.g., attenuation in the prescribed frequency bands, improved attenuation levels, and broadband attenuations. This proof-of-concept study shows that the proposed folding-based mechanism, along with the modularization design concept, would provide a new way to reconfigure the silencer for acoustic adaptability and inspire new innovation in designing acoustic devices.

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Sound-insulting performance of origami-based sandwich trusscore panels

Cited by 2 publications

References 0 publications

Development of New Sound Insulation Simulation Technology Using Finite Element Method for Efficiency of High Aspect Ratio Core in Low Frequency Range

Development of New Sound Insulation Simulation Technology Using Finite Element Method for Efficiency of High Aspect Ratio Core in Low Frequency Range

Reconfigurable origami silencers for tunable and programmable sound attenuation

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