Reduction of structural vibration and radiated noise using acoustic resistive volume

2020 ◽  
Vol 148 (4) ◽  
pp. 2488-2488
Author(s):  
Jin Liu
Keyword(s):  
Structural Vibration ◽  
Radiated Noise

Radiated noise control via structural vibration control

1998 ◽  
Author(s):  
Vasundara V. Varadan ◽  
Senthil V. Gopinathan ◽  
Young-Hun Lim ◽  
Vijay K. Varadan
Keyword(s):  
Vibration Control ◽  
Noise Control ◽  
Structural Vibration ◽  
Structural Vibration Control ◽  
Radiated Noise

scholarly journals Optimization of the Housing Shape Design for Radiated Noise Reduction of an Agricultural Electric Vehicle Gearbox

2020 ◽  
Vol 10 (23) ◽  
pp. 8414
Author(s):  
Gwan-Hee Son ◽  
Beom-Soo Kim ◽  
Seung-Je Cho ◽  
Young-Jun Park
Keyword(s):  
Noise Reduction ◽  
Electric Vehicle ◽  
Computing Time ◽  
Optimization Technique ◽  
Operating Conditions ◽  
Structural Vibration ◽  
Shape Design ◽  
Fe Model ◽  
Radiated Noise ◽  
Noise Characteristics

As the demand for agricultural electric vehicles increases, it is becoming important to conduct noise reduction in consideration of the characteristics of an electric powertrain. This study was conducted to optimize the shape design of gearbox housing for radiated noise reduction of an agricultural electric vehicle gearbox. The noise and vibration of the gearbox were measured considering the noise characteristics of the electric vehicle gearbox, which radiates high-frequency pure tone noise. The main noise source radiated by the structural vibration of the gearbox housing was identified and considered when modeling the loading conditions in the numerical analysis. To improve the reliability, the finite element (FE) model was updated and validated. Internal machine elements were modeled as a substructure through a reduced-order modeling method to reduce the computing time and apply a constant gear excitation force. The weak areas of structure were determined and it was used as the design area for optimization. The topology optimization technique was used to reduce the equivalent radiated power (ERP) which was used as an indicator of radiated noise level. The maximum value of the ERP decreased under all operating conditions at the rated speed.

scholarly journals STUDY ON STRUCTURAL-ACOUSTIC CHARACTERISTICS OF CYLINDRICAL SHELL BASED ON WAVENUMBER SPECTRUM ANALYSIS METHOD

Brodogradnja ◽  
2021 ◽  
Vol 72 (2) ◽  
pp. 57-71
Author(s):  
Liu Wenxi ◽  
◽  
Guan Huiren ◽  
Zhou Qidou ◽  
Lou Jingjun
Keyword(s):  
Spectrum Analysis ◽  
Axial Direction ◽  
Exciting Force ◽  
Structural Vibration ◽  
Normal Velocity ◽  
Analysis Method ◽  
Radiated Noise ◽  
Distribution Form ◽  
Wavenumber Spectrum ◽  
The Moment

By the finite element method, the structural vibration response is calculated under the action of the axial exciting force and the moment with different distribution form, and then the transfer function of the mean square normal velocity is analyzed. The wavenumber spectrum analysis method is used to separate and quantify the shell vibration in the wavenumber domain, and then the relation between the structural vibration characteristics and the structural wavelength is summarized. It is concluded that the structural vibration and radiated noise can be reduced under the symmetric action of axial exciting force and the moment. Based on the above conclusion, a symmetrical thrust bearing supporting system is designed and the stiffness of the supporting structure in the axial direction is controlled by selecting suitable size of structural members, therefore, the structural vibration and radiated noise of the submarine is reduced significantly.

scholarly journals Train-Induced Building Vibration and Radiated Noise by Considering Soil Properties

2020 ◽  
Vol 12 (3) ◽  
pp. 937
Author(s):  
Chao Zou ◽  
Yimin Wang ◽  
Ziyu Tao
Keyword(s):  
Soil Properties ◽  
Ground Improvement ◽  
Three Dimensional ◽  
Structural Vibration ◽  
Population Increase ◽  
Land Resource ◽  
Development Mode ◽  
Vibration Transmission ◽  
Radiated Noise ◽  
The Impact

Constructing buildings above subway tracks exploits urban-area space intensively by adopting the three-dimensional overlapping development mode, which is one of the important measures for solving the contradictions among urban population increase, land resource shortage, and environmental protection. However, the vibration generated by the frequent train operations is transmitted to the upper buildings through the track structure and ground soil, which can cause structural vibrations and radiated noise and bring physical and mental side effects to occupants within the buildings. Subway projects are often located in geologically sensitive areas, while the influences of the encountered geological problems on the generation and propagation of structural vibration and structure-radiated noise within the buildings are not yet clear. Hence, this paper presents a method of studying the train-induced vibration transmission from the ground up into the buildings and the structure-radiated noise within the building. The method consists of a train-track model, track-soil-building model, and structure-radiated noise simulation. The impact of soil properties on the building vibration and structure-radiated noise is analyzed and ground-improvement measures are proposed in order to mitigate vibration and structure-radiated noise within buildings. The results show that the interaction between soil and structure has a great impact on vibration transmission from the ground into the building. Good foundations reduce vibration transmission from ground soil up into the building and lead to a lower level of structure-radiated noise. Ground improvements increase the impedance of ground soil, thereby weakening the vibration transmission and lowering the structure-radiated noise.

Modeling Vibration-Induced Tire-Pavement Interaction Noise in the Mid-frequency Range

2020 ◽  
Author(s):  
Sterling McBride ◽  
Ricardo Burdisso ◽  
Corina Sandu
Keyword(s):  
Sound Intensity ◽  
Element Model ◽  
Dominant Frequency ◽  
Contact Forces ◽  
Surface Velocity ◽  
New Wave ◽  
Normal Surface ◽  
Radiated Noise ◽  
Physical Effects ◽  
Effects Of Rotation

ABSTRACT Tire-pavement interaction noise (TPIN) is one of the main sources of exterior noise produced by vehicles traveling at greater than 50 kph. The dominant frequency content is typically within 500–1500 Hz. Structural tire vibrations are among the principal TPIN mechanisms. In this work, the structure of the tire is modeled and a new wave propagation solution to find its response is proposed. Multiple physical effects are accounted for in the formulation. In an effort to analyze the effects of curvature, a flat plate and a cylindrical shell model are presented. Orthotropic and nonuniform structural properties along the tire's transversal direction are included to account for differences between its sidewalls and belt. Finally, the effects of rotation and inflation pressure are also included in the formulation. Modeled frequency response functions are analyzed and validated. In addition, a new frequency-domain formulation is presented for the computation of input tread pattern contact forces. Finally, the rolling tire's normal surface velocity response is coupled with a boundary element model to demonstrate the radiated noise at the leading and trailing edge locations. These results are then compared with experimental data measured with an on-board sound intensity system.

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