Aeroacoustic Attenuation Performance of a Helmholtz Resonator with a Rigid Baffle Implemented in the Presence of a Grazing Flow

Guan, Di; Zhao, Dan; Ren, Zhaoxin

doi:10.1155/2020/1916239

Cited by 32 publications

(20 citation statements)

References 47 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

Section: Resultsmentioning

confidence: 99%

“…It can be seen that at the resonant frequency, vortex shedding is generated at the neck area. 19 However, there are no clear observations on the flow filed such as velocity and vorticity in the resonator cavity. Figure 14 shows the comparison of the velocity and vorticity contours of Design A and Designs B-D at Ma ¼ 0.1 and a ¼ 45 .…”

Section: Effect Of the Deflection Angle Amentioning

confidence: 99%

“…He found that the perforation rate has a slight effect on the acoustic performance at the low-frequency range, and a significant impact on the acoustic performance at the mid-frequency range. Meanwhile, Guan et al 19 designed a Helmholtz resonator with a rigid baffle implemented in its cavity. They studied the effect of the configurations of the baffle and the neck shape.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Numerical investigation on low-frequency noise damping performances of Helmholtz resonators with an extended neck in presence of a grazing flow

Guan

2021

Journal of Low Frequency Noise, Vibration and Active Control

View full text Add to dashboard Cite

In this work, modified designs of Helmholtz resonators with extended deflected neck are proposed, numerically evaluated and optimized aiming to achieve a better transmission loss performance over a broader frequency range. For this, 10 Helmholtz resonators with different extended neck configurations (e.g. the angle between extended neck and the y-axis) in the presence of a grazing flow are assessed. Comparison is then made between the proposed resonators and the conventional one, i.e. in the absence of an extended neck (i.e. Design A). For this, a two-dimensional linearized Navier Stokes equations-based model of a duct with the modified Helmholtz resonator implemented was developed in frequency domain. The model was first validated by comparing its numerical predictions with the experimental results available in the literature and the theoretical results. The model was then applied to evaluate the noise damping performance of the Helmholtz resonator with (1) an extended neck on the upstream side (Design B); (2) on the downstream side (Design C), (3) both upstream and downstream sides (Design D), (4) the angle between the extended neck and the y-axis, i.e. (a) 0°, (b) 30°, and (c) 45°, (d) 48.321°. In addition, the effects of the grazing flow Mach number (Ma) were evaluated. It was found that the transmission loss peaks of the Helmholtz resonator with the extended neck was maximized at Ma = 0.03 than at the other Mach numbers. Conventional resonator, i.e. Design A was observed to be associated with a lower transmission loss performance at a lower resonant frequency than those as observed on Designs B–D. Moreover, the optimum design of the proposed resonators with the extended neck is shown to be able to shift the resonant frequency by approximately 90 Hz, and maximum transmission loss could be increased by 28–30 dB. In addition, the resonators with extended necks are found to be associated with two or three transmission loss peaks, indicating that these designs have a broader effective frequency range. Finally, the neck deflection angles of 30° and 45° are shown to be involved with better transmission loss peaks than that with a deflection angle of 0°. In summary, the present study sheds light on maximizing the resonator’s noise damping performances by applying and optimizing an extended neck.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Effect Of the Deflection Angle Amentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Numerical investigation on low-frequency noise damping performances of Helmholtz resonators with an extended neck in presence of a grazing flow

Guan

2021

Journal of Low Frequency Noise, Vibration and Active Control

View full text Add to dashboard Cite

show abstract

“…e model is divided into free tetrahedral meshes by using the meshing function in the software. e unit cell contains 50556 domain elements, 6840 boundary elements, and 700 edge elements [27]. e simulation grid is shown in Figures 6(a) and 6(b).…”

Section: Finite Element Simulationmentioning

confidence: 99%

Design of Honeycomb Microperforated Structure with Adjustable Sound Absorption Performance

Yan

Chen

et al. 2021

Shock and Vibration

View full text Add to dashboard Cite

In this work, a double-layer honeycomb microperforated structure with adjustable back-cavity’s height is designed based on cylinder honeycomb structure and microperforated panel (MPP). The sound absorption performance can be changed by adjusting the height of back-cavity. Thus, a better absorption performance is achieved by changing the position of the inner MPP. Acoustic impedance of the structure was calculated based on transfer matrix method. The sound absorption coefficient of the structure was obtained by finite element method (FEM). Meanwhile, the 3D printing technology was used to produce the experimental samples. The experimental results demonstrate that the sound absorption coefficient of the structure is greater than 0.8 in the range of 750–1250 Hz, greater than 0.9 in the range of 2297–3592 Hz, and above 0.5 in the range of 500–4000 Hz. In addition, the feasibility of achieving adjustable sound absorption by means of changing the height of the back-cavity is verified by theoretical, simulation, and experimental results. The structure proposed in this work can realize the function of wide-band and better sound absorption performance by changing the position of the inner MPP, which can be applied to effectively reduce different frequencies noise.

show abstract

“…Yan et al [11] studied the influence of the user interface layout on users' psychological load by analyzing the operators in emergency operation procedures of nuclear power plants. In the space field, the visualization method of data analysis should be optimized and set according to the cognitive psychology of users [12][13][14][15][16]. Akyeampong et al [17] used Task Load Index (NASA-TLX) to evaluate the hydraulic excavator Human Machine Interface (HMI)and proposed an innovative HMI solution that reduced the mental and physical load on the operator.…”

Section: Introductionmentioning

confidence: 99%

Optimal Design of Virtual Reality Visualization Interface Based on Kansei Engineering Image Space Research

Tang

et al. 2020

Symmetry

View full text Add to dashboard Cite

To effectively organize design elements in virtual reality (VR) scene design and provide evaluation methods for the design process, we built a user image space cognitive model. This involved perceptual engineering methods and optimization of the VR interface. First, we studied the coupling of user cognition and design features in the VR system via the Kansei Engineering (KE) method. The quantitative theory I and KE model regression analysis were used to analyze the design elements of the VR system’s human–computer interaction interface. Combined with the complex network method, we summarized the relationship between design features and analyzed the important design features that affect users’ perceptual imagery. Then, based on the characteristics of machine learning, we used a convolutional neural network (CNN) to predict and analyze the user’s perceptual imagery in the VR system, to provide assistance for the design optimization of the VR system design. Finally, we verified the validity and feasibility of the solution by combining it with the human–machine interface design of the VR system. We conducted a feasibility analysis of the KE model, in which the similarity between the multivariate regression analysis of the VR intention space and the experimental test was approximately 97% and the error was very small; thus, the VR intention space model was well correlated. The Mean Square Error (MSE) of the convolutional neural network (CNN) prediction model was calculated with a measured value of 0.0074, and the MSE value was less than 0.01. The results show that this method can improve the effectiveness and feasibility of the design scheme. Designers use important design feature elements to assist in VR system optimization design and use CNN machine learning methods to predict user image values in VR systems and improve the design efficiency. Facing the same design task requirements in VR system interfaces, the traditional design scheme was compared with the scheme optimized by this method. The results showed that the design scheme optimized by this method better fits the user’s perceptual imagery index, and thus the user’s task operation experience was better.

show abstract

Aeroacoustic Attenuation Performance of a Helmholtz Resonator with a Rigid Baffle Implemented in the Presence of a Grazing Flow

Cited by 32 publications

References 47 publications

Numerical investigation on low-frequency noise damping performances of Helmholtz resonators with an extended neck in presence of a grazing flow

Numerical investigation on low-frequency noise damping performances of Helmholtz resonators with an extended neck in presence of a grazing flow

Design of Honeycomb Microperforated Structure with Adjustable Sound Absorption Performance

Optimal Design of Virtual Reality Visualization Interface Based on Kansei Engineering Image Space Research

Contact Info

Product

Resources

About