An improved structural-acoustic coupling model for tire cavity noise

2018 ◽  
Vol 66 (3) ◽  
pp. 244-257
Author(s):  
Yongbao Yang ◽  
Yongchang Du ◽  
Ruting Tong ◽  
Yintao Wei
Keyword(s):  
Coupling Model ◽  
Acoustic Coupling ◽  
Tire Cavity Noise

scholarly journals Dataset for verification of a vibro-acoustic coupling model and optimized results on sectional geometries of two sealing rubber models

Data in Brief ◽  
2020 ◽  
Vol 31 ◽  
pp. 106038
Author(s):  
Guoming Deng ◽  
Jianwang Shao ◽  
Songlin Zheng ◽  
Xian Wu
Keyword(s):  
Coupling Model ◽  
Acoustic Coupling

Measurement of loudspeaker mechanical impedance by changing the sound load at the throat of loudspeaker

2021 ◽  
Vol 263 (1) ◽  
pp. 5457-5466
Author(s):  
Shichun Huang ◽  
Liang Yu ◽  
Weikang Jiang
Keyword(s):  
Measurement System ◽  
Electrical Impedance ◽  
Structural Parameters ◽  
Impedance Measurement ◽  
Mechanical Impedance ◽  
Coupling Model ◽  
Acoustic Energy ◽  
Mathematical Relationship ◽  
Radiation Impedance ◽  
Acoustic Coupling

A loudspeaker is a device that converts electrical energy into acoustic energy by coupling between electrical impedance, mechanical impedance, and radiation impedance. The loudspeaker electro-mechanical-acoustic coupling model provides the experimental feasibility to measure the characteristic parameters. In this paper, an economical and practical measurement method of loudspeaker mechanical impedance is proposed. First, the mathematical relationship between loudspeaker electrical impedance and mechanical impedance is obtained based on the loudspeaker electro-mechanical-acoustic coupling model. Second, two electrical impedances with different known radiation impedance are measured by using a developed measurement system. Finally, the real and imaginary parts of the mechanical impedance are obtained according to the mathematical relationship. This method neither assumes that the loudspeaker mechanical impedance is constant in a frequency band nor does it build FEM models based on structural parameters. A loudspeaker is measured by using a developed measurement system. The result shows that the mechanical impedance and the force factor are functions of frequency. Moreover, a radiation impedance measurement is performed to verify the feasibility and accuracy of the proposed method.

Modal Analysis of Structural-Acoustic Coupling for a Passenger Car

2013 ◽  
Vol 718-720 ◽  
pp. 1573-1578
Author(s):  
Deng Zhi Peng ◽  
Deng Feng Wang ◽  
Shu Ming Chen
Keyword(s):  
Optimal Design ◽  
Modal Analysis ◽  
Dynamic Characteristic ◽  
Coupling Model ◽  
Mode Shapes ◽  
Natural Mode ◽  
Passenger Car ◽  
Acoustic Coupling ◽  
Acoustic Cavity

Due to the interaction of structure and acoustic cavity, the frequency and mode shapes of the structure and acoustic cavity are different from their natural mode. To perform the dynamic characteristic of the passenger car more accurately, a structural-acoustic coupling model was established to analysis its modes. The result is benefit for the later optimal design of acoustic.

SATOUMI APPROACH FOR REALIZING SUSTAINABLE COASTAL USE IN A RIASTYPE BAY: A CASE OF SHIZUGAWA BAY IN SANRIKU COAST HIT BY THE HUGE TSUNAMI ON 11 MARCH 2011

2017 ◽  
Author(s):  
Teruhisa Komatsu ◽  
Teruhisa Komatsu ◽  
Shuji Sasa ◽  
Shuji Sasa ◽  
Shigeru Montani ◽  
...  
Keyword(s):  
Local Governments ◽  
Minor Element ◽  
Coupling Model ◽  
Sanriku Coast ◽  
High Productivity ◽  
Biological Coupling ◽  
Miyagi Prefecture ◽  
Human Use ◽  
A Minor ◽  
Aquaculture Facilities

Rias-type bays are one of the most common coasts in Japan where aquacultures have been active due to sheltered geological shape with a deep bottom. The huge tsunami hit Sanriku Coast consisting of open rias-type bays near the epicenter facing Pacific Ocean on 11 March 2011. For recovering Sanriku Coast, it is important to include sustainability in its program. Satoumi is defined as the human use and management of coastal seas for high productivity while maintaining high biodiversity. Therefore, we proposed Satoumi approach to an open rias-type bay, Shizugawa Bay, in southern Sanriku Coast. We conducted scientific researches on mapping of coastal habitats and aquaculture facilities, hydrography, and material flows of nutrients, a minor element (Fe) and organic matters in the bay including those from the rivers and from the offshore waters. At the same time, Committee for Shizugawa Bay Management of Fishermen’s Cooperative of Miyagi Prefecture decided to decrease in aquaculture facilities for sustainable development of aquaculture. Based on these data, a physical-biological coupling model was used for calculating the number of aquaculture facilities that are suitable not only for yields but also for environments. These researches were established on strong collaborations among a fishermen’s’ cooperative, local governments and scientists. Results of this practice may help to realize sustainable coastal use of a rias-type bay.

An alternative model of the vibronic coupling in octahedral complexes

1988 ◽  
Vol 53 (6) ◽  
pp. 1134-1140
Author(s):  
Martin Breza ◽  
Peter Pelikán
Keyword(s):  
Linear Regression ◽  
Alternative Model ◽  
Potential Surface ◽  
Analytical Formula ◽  
Coupling Model ◽  
Regression Method ◽  
Vibronic Coupling ◽  
Linear Regression Method ◽  
Active Systems ◽  
Jahn Teller

It is suggested that for some transition metal hexahalo complexes, the Eg-(a1g + eg) vibronic coupling model is better suited than the classical T2g-(a1g + eg) model. For the former, alternative model, the potential constants in the analytical formula are evaluated from the numerical map of the adiabatic potential surface by using the linear regression method. The numerical values for 29 hexahalo complexes of the 1st row transition metals are obtained by the CNDO/2 method. Some interesting trends of parameters of such Jahn-Teller-active systems are disclosed.

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