Acoustic wave transmission characteristics of stiffened composite shell systems with double curvature

Zarastvand, M.R.; Asadijafari, M.H.; Talebitooti, Roohollah

doi:10.1016/j.compstruct.2022.115688

Cited by 50 publications

(16 citation statements)

References 49 publications

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“…Figure14(a) and (b) are the curves of rail acceleration and track slab acceleration with time, respectively. It can be seen from the figure that the waveforms of time history curve of the vibration acceleration of the rail are very similar to those of the track slab, and both can reflect the process of wheel load.…”

Section: Analysis Of the Effect Of Wheel Polygon Wear On The Vibratio...mentioning

confidence: 99%

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Influences of wheel polygon amplitude on wheel-rail vibration and sound radiation

Song

Wang

et al. 2023

Journal of Low Frequency Noise, Vibration and Active Control

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Wheel polygon amplitude can greatly affect wheel-rail vibration and sound radiation. Based on multi-body dynamics theory, a vehicle-track rigid-flexible coupling dynamics model was established. According to the actual running wear condition of the wheel, the wheel-rail vibration response was calculated and analyzed (the order of wheel polygons is 20, and the polygon amplitude is 0.01/0.02/0.03/0.04 mm, respectively). Together with the finite element/boundary model of the wheel, the calculated wheel-rail force was used as an external incentive to analyze the effects of polygon amplitude on the time-frequency domain of wheel noise. The research results show that: when the polygon order is 20, with the increase of polygon amplitude, the wheel-rail vertical force and the acceleration of wheel, rail and track slab increase gradually. It’s also found that the rail acceleration is obviously more sensitive to the amplitude than the track slab acceleration, while the vertical displacement of the rail and track slab is less sensitive to the polygon amplitude. At the same amplitude, the closer to the wheel rolling line, the more obvious the sound pressure decreases with the increase of height. At different amplitudes, the sound pressure at different positions will increase with the rise of the polygon amplitude. The root mean square value of sound power increases gradually with the addition of amplitude: When the amplitude changes from 0.01 mm to 0.04 mm, the calculated sound power increases by 4.1 dB.

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Section: Analysis Of the Effect Of Wheel Polygon Wear On The Vibratio...mentioning

confidence: 99%

“…However, the imposed wheel-rail force did not take into account the wheel non-circularity. Meanwhile, in order to deeply analyze the transmission characteristics of wheel noise, inspirations from the acoustic characteristics of shell structure, 13,14 cylinder structure, 15 and plate structure 16 can be used for references.…”

Section: Introductionmentioning

confidence: 99%

Influences of wheel polygon amplitude on wheel-rail vibration and sound radiation

Song

Wang

et al. 2023

Journal of Low Frequency Noise, Vibration and Active Control

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“…The lower band has been used in many wireless systems, whilst the majority of the upper portion of the spectrum is not used (but may be used) for 5G technology. Potential commercial uses, such as automobile radars and high-data-rate systems, have been made possible due to the rising demand for inexpensive circuitry and better data transfer rates in these bands [ 3 , 4 , 5 ]. Achieving complete transparency and rate convergence between wireless and wired links, millimeter wave (mmWave), and terahertz (THz) bands, which are the new wireless communication technology frontiers, could lead to seamless interconnections between ultra-high speed wired networks (fiber optic links) and personal wireless devices (laptops).…”

Section: Introductionmentioning

confidence: 99%

Path Loss Measurements and Model Analysis in an Indoor Corridor Environment at 28 GHz and 38 GHz

Oladimeji

Kumar

Elmezughi

2022

Sensors

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This paper examines the large-scale path loss models for an indoor corridor environment at frequencies of 28 and 38 GHz. The measurement environment consists of an indoor corridor with both line-of-sight (LOS) and non-line of sight (NLOS) scenarios using vertical–vertical (V–V) and vertical–horizontal (V–H) antenna polarizations. The single-frequency close-in (CI), floating intercept (FI), free space large-scale path loss models and measured data from the measurement campaign were used to evaluate the performance analysis. The paper also focuses on various parameters, such as standard deviation, path loss exponent (PLE), accuracy, simplicity, and stability of the models. The analysis focuses on the peculiarity of the effect of the wall proximity on the path loss parameters as well as comparisons with the parameters in some of the reviewed literature studies. The FI and CI models produce comparable results for both antenna polarizations and clearly fit with the measured path loss. The PLE, with the highest value of 3.33 at 38 GHz (V–H), is much higher in the NLOS scenario with V–H polarization due to the signal degradation along the path from the transmitter (Tx) to the receiver (Rx). This is because there is no direct LOS between the Tx and Rx antennas. The Rx only relies on signal diffractions and reflections from obstacles as it transmits through the path from the Tx antenna. The path loss measurements and model analysis presented here are useful in designing 5G wireless communication systems for indoor environments, particularly for power budget calculations.

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“…Efimtsov and Lazarev 9,10 developed an effective method on the basis of the space harmonic expansion to predict the vibro-acoustic characteristic of an orthogonally stiffened cylindrical shell. By employing shear deformation shallow shell theory, Rahmatnezhad et al 11 proposed an analytical strategy to acoustically determine the vibration response of a doubly curved composite shell in a thermal environment while Zarastvand et al 12 studied the acoustic performance of doubly curved composite shells with stiffeners. Moreover, considering the main aim of enhancing the structural acoustic characteristic by decreasing the vibration and noise of the construction, some damping materials and sound absorption materials are embedded into the double-walled cylindrical shells.…”

Section: Introductionmentioning

confidence: 99%

Acoustic radiation performance investigation of a double-walled cylindrical shell equipped with annular plates and porous foam media

Zheng

Yan

et al. 2022

Journal of Low Frequency Noise, Vibration and Active Control

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Acoustic radiation through a system of double-walled shells, lined with porous foams, and stiffened by annular plates simultaneously is studied. Based on modeling, the porous foams as absorbent fluid property, acoustic characteristics of structure are presented for various sandwich construction by means of vibro-acoustic finite element method with automatic matching layer technology. It is noted that equipping porous foams and annular plates simultaneously enhances the acoustic insulation of structure in the entire frequency domain. The overall sound power level is modified by the density of shell. Moreover, the increase of structural stiffness is shown to effectively reduce the acoustic radiation via rising the thickness of inner shell and the number of annular plates. The foam cores decrease the peak value of structural sound power level through using polyurethane foam cores and increasing filling ratio.

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Acoustic wave transmission characteristics of stiffened composite shell systems with double curvature

Cited by 50 publications

References 49 publications

Influences of wheel polygon amplitude on wheel-rail vibration and sound radiation

Influences of wheel polygon amplitude on wheel-rail vibration and sound radiation

Path Loss Measurements and Model Analysis in an Indoor Corridor Environment at 28 GHz and 38 GHz

Acoustic radiation performance investigation of a double-walled cylindrical shell equipped with annular plates and porous foam media

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