Asynchronous control of vortex-induced acoustic cavity resonance using imbedded piezo-electric actuators

2009 ◽  
Vol 126 (1) ◽  
pp. 36-45 ◽  
Author(s):  
M. M. Zhang ◽  
L. Cheng ◽  
Y. Zhou
Keyword(s):  
Cavity Resonance ◽  
Acoustic Cavity ◽  
Asynchronous Control ◽  
Piezo Electric

scholarly journals Analysis of Tire Acoustic Cavity Resonance Energy Transmission Characteristics in Wheels Based on Power Flow Method

2021 ◽  
Vol 11 (9) ◽  
pp. 3979
Author(s):  
Wei Zhao ◽  
Yuting Liu ◽  
Xiandong Liu ◽  
Yingchun Shan ◽  
Xiaojun Hu
Keyword(s):  
Power Flow ◽  
Resonance Energy ◽  
Cavity Resonance ◽  
Propagation Path ◽  
Material Structure ◽  
Transmission Characteristics ◽  
Energy Transmission ◽  
Flow Method ◽  
Acoustic Cavity ◽  
Power Flow Method

As a kind of low-frequency vehicle interior noise, tire acoustic cavity resonance noise plays an important role, since the other noise (e.g., engine noise, wind noise and friction noise) has been largely suppressed. For the suspension system, wheels stand first in the propagation path of this energy. Therefore, it is of great significance to study the influence of wheel design on the transmission characteristics of this vibration energy. However, currently the related research has not received enough attention. In this paper, two sizes of aluminum alloy wheel finite element models are constructed, and their modal characteristics are analyzed and verified by experimental tests simultaneously. A mathematically fitting sound pressure load model arising from the tire acoustic cavity resonance acting on the rim is first put forward. Then, the power flow method is applied to investigate the resonance energy distribution and transmission characteristics in the wheels. The structure intensity distribution and energy transmission efficiency can be described and analyzed clearly. Furthermore, the effects of material structure damping and the wheel spoke number on the energy transmission are also discussed.

Design and simulation of Helmholtz resonator assembly used to attenuate tire acoustic cavity resonance noise

2021 ◽  
Vol 263 (6) ◽  
pp. 942-953
Author(s):  
Wei Zhao ◽  
Xiandong Liu ◽  
Yingchun Shan ◽  
Tian He
Keyword(s):  
Natural Frequencies ◽  
Helmholtz Resonator ◽  
Operating Conditions ◽  
Cavity Resonance ◽  
Frequency Range ◽  
Sound Fields ◽  
Acoustic Cavity ◽  
The Poor ◽  
Alloy Wheel ◽  
Reduction Effect

Tire acoustic cavity resonance noise (TACRN) is a typical annoying lower-frequency interior noise of a passenger car. The widely used attenuating method of attaching the porous sound absorption material in tire cavity can reduce TACRN effectively, but causes the increase of tire-wheel assembly weight and cost, also the poor durability. Additionally, the Helmholtz resonator (HR) is also used in the wheel of some cars although having only narrow effective band. The existing investigation shows that the frequency of TACRN varies with the car speed and load and also has the split characteristics. The change of TACRN frequency causes a certain difficulty to suppress TACRN effectively. Aiming at this problem, in this paper, TACRN frequency range of a specific tire cavity under different operating conditions is first calculated and analyzed. Then, for a specific aluminum alloy wheel, a HR assembly including several HRs is designed to make the natural frequencies of HR assembly cover the TACRN frequencies. Finally, the reduction effect of TACRN is simulated and evaluated by comparing the sound fields in tire cavity with/without HR assembly under same volume velocity sound source. This work is helpful for attenuating TACRN effectively under the changing operating conditions.

Synthetic Jet Actuator Cavity Acoustics: Helmholtz Versus Quarter-Wave Resonance

2015 ◽  
Vol 137 (5) ◽  
Author(s):  
Tyler Van Buren ◽  
Edward Whalen ◽  
Michael Amitay
Keyword(s):  
Acoustic Resonance ◽  
Synthetic Jet ◽  
Cavity Resonance ◽  
Synthetic Jet Actuator ◽  
Acoustic Cavity ◽  
Wave Resonance ◽  
Cavity Resonances ◽  
Quarter Wave ◽  
Cavity Acoustics ◽  
The Impact

The impact of cavity geometry on the source of acoustic resonance (Helmholtz or quarter-wave) for synthetic jet type cavities is presented. The cavity resonance was measured through externally excited microphone measurements. It was found that, for pancake-shaped cavities, the Helmholtz resonance equation was inadequate (off by more than 130%) at predicting the acoustic cavity resonances associated with synthetic jet actuation, whereas a two-dimensional quarter-wave resonance was accurate to 15%. The changes in the geometry (cavity diameter, cavity height, and orifice length) could alter the cavity resonance by up to 50%, and a finite element solver was accurate at predicting this resonance in all cases. With better knowledge of the phenomena governing the acoustic resonance, prediction of the cavity resonance can become more accurate and improvements to current prediction tools can be made.

scholarly journals Simulation and Experimental Validation of Sound Field in a Rotating Tire Cavity Arising from Acoustic Cavity Resonance

2021 ◽  
Vol 11 (3) ◽  
pp. 1121
Author(s):  
Xiaojun Hu ◽  
Xiandong Liu ◽  
Yingchun Shan ◽  
Tian He
Keyword(s):  
Sound Pressure ◽  
Influence Factors ◽  
Sound Field ◽  
Element Model ◽  
Simulation Method ◽  
Cavity Resonance ◽  
Rotating Speed ◽  
Automobile Tire ◽  
Acoustic Cavity ◽  
Simplified Finite Element Model

As we all know, the tire acoustic cavity resonance noise (TACRN) can cause irritating noise in a vehicle, but it is evidently difficult to be weakened. To obtain accurately the characteristics of TACRN is a key step of attenuating TACRN. In this paper, a simulation method, in which a simplified finite element model of automobile tire with acoustic cavity introducing the rotation of automobile tire is established, is proposed to gain the sound field in the cavity of a rotating automobile tire. And the test of sound pressure in a rotating tire is also performed to validate the proposed simulation method. The comparisons between the simulation and experimental consequences show a satisfying conclusion. Furthermore, the influence factors of the rotating speed, the inflation pressure of the tire and the load on the sound field of automobile tire acoustic cavity are calculated and analyzed.

Analytical Model of Tire Cavity Resonance and Coupled Tire/Cavity Modal Model

2000 ◽  
Vol 28 (1) ◽  
pp. 33-49 ◽  
Author(s):  
R. Gunda ◽  
S. Gau ◽  
C. Dohrmann
Keyword(s):  
Plane Wave ◽  
Analytical Model ◽  
Interior Noise ◽  
Analytical Models ◽  
Cavity Resonance ◽  
Coupling Matrix ◽  
Acoustic Cavity ◽  
Resonance Frequencies ◽  
Cavity Structure ◽  
Modal Model

Abstract The acoustic resonance of the air cavity in the tire/wheel assembly may be a contributor to vehicle interior noise through the structure-borne noise transmission path. This problem has been examined in the past using approximate closed form solutions (based on plane wave theory for a two-tube model) and numerically, using FEA. The coupling between the cavity resonance and structural resonance of the wheel may result in higher levels of interior noise as noted previously. The two primary goals of this paper are (1) to develop simple analytical models to gain fundamental understanding of some observed phenomena and for a quick estimation of cavity resonance frequency to assist in the design process, and (2) to develop tire modal models incorporating the acoustic cavity to predict coupled system natural frequencies and response. An improved analytical model for accurate calculation of acoustic cavity resonance frequencies of a static, unloaded tire is developed using variational principles. The sensitivities of the cavity resonance frequencies to tire width and aspect ratio are examined. For the case of a loaded tire, an improved analytical formulation based on plane wave propagation (for linearly varying cross-sectional area) is developed. Deformed structure geometry from FEA is used as input to the analytical model. The FEA-based methodology used in the tire/cavity coupling analysis is as follows: The tire structural modes are calculated, ignoring the effect of the acoustic cavity. The tire cavity modes are calculated using deformed cavity geometry only. Next, the structural/acoustic coupling matrix is calculated. Finally, a coupled cavity-structure modal model is generated from modal mass and stiffness of the tire/wheel assembly, the cavity modal matrices, and the coupling matrix. This process is an improvement over conventional tire modal models, which only include structural modes.

Experimental analysis of sound field in the tire cavity arising from the acoustic cavity resonance

2020 ◽  
Vol 161 ◽  
pp. 107172 ◽  
Author(s):  
Xiaojun Hu ◽  
Xiandong Liu ◽  
Xiaofei Wan ◽  
Yingchun Shan ◽  
Jiajing Yi
Keyword(s):  
Experimental Analysis ◽  
Sound Field ◽  
Cavity Resonance ◽  
Acoustic Cavity

Characteristics of sound pressure in the tire cavity arising from acoustic cavity resonance excited by road roughness

2019 ◽  
Vol 146 ◽  
pp. 218-226 ◽  
Author(s):  
Jiajing Yi ◽  
Xiandong Liu ◽  
Yingchun Shan ◽  
He Dong
Keyword(s):  
Sound Pressure ◽  
Cavity Resonance ◽  
Acoustic Cavity ◽  
Road Roughness

Research on mechanism and evolution features of frequency split phenomenon of tire acoustic cavity resonance

2020 ◽  
pp. 107754632092679
Author(s):  
Yuting Liu ◽  
Xiandong Liu ◽  
Yingchun Shan ◽  
Xiaojun Hu ◽  
Jiajing Yi
Keyword(s):  
Velocity Structure ◽  
Rotation Velocity ◽  
Euler Method ◽  
Cavity Resonance ◽  
Acoustic Medium ◽  
Frequency Variation ◽  
Inflation Pressure ◽  
Driving Experience ◽  
Acoustic Cavity ◽  
Slope Change

The acoustic cavity resonance inside the tire–wheel assembly is known to contribute to audible noise in the passenger compartment of vehicles. To obtain control methods of tire acoustic cavity resonance, its characteristics and producing mechanism need to be clarified first. In this article, the finite element model of a tire coupled with acoustic medium in the tire cavity is constructed. The Euler method is introduced to study the modal characteristics of tire cavity under the influence of tire inflation pressure, load, and tire rotation velocity. Frequency splitting phenomena under four separate conditions (stationary tire without load, stationary tire with load, rotating tire without load, and rotating tire with load) are simulated and analyzed. The slope change of the resonance frequency as a function of rotation speed is found to be close to the reciprocal of tire radius which can be explained by a model of wave propagation in a ring-shaped channel with moving media inside the ring. The obtained function of the slope change can help determine the frequency variation range under different vehicle velocity, structure load, and tire inflation pressure, which can then help to control the cavity resonance energy and provide a more comfortable driving experience.

Experimental Study of the Acoustic Cavity Resonance in Automobile Tire Dynamic Response

1999 ◽  
Author(s):  
Molly J. Subler ◽  
Richard F. Keltie ◽  
Dimitri Tsihlas
Keyword(s):  
Resonance Frequency ◽  
Transfer Functions ◽  
Dynamic Stiffness ◽  
Acoustic Resonance ◽  
Cavity Resonance ◽  
Inflation Pressure ◽  
Automobile Tire ◽  
Acoustic Cavity ◽  
Cavity Modes ◽  
Helium Gas

Abstract A series of tests were conducted to measure the dynamic stiffness transfer functions between the wheel center of a rim-mounted tire and the contact patch. Of particular interest was the interaction between the tire acoustic cavity mode and the modes of the tire/rim system. By varying the concentration of helium gas within the tire, it was possible to sweep the acoustic resonance through a group of rim/tire resonances. These results showed that there is relatively weak interaction between the cavity modes and the tire/rim modes. It was found that the resonance frequency of the cavity shifts downward with increasing tire load, and that only the z-direction dynamic stiffness is affected by load. Changes in inflation pressure were found to have no effect on the cavity resonance frequency, and increases in inflation pressure led to significant changes only in the x-direction dynamic stiffness. A simple analytical model of a coupled structural/acoustic system was found to produce results similar to those observed in the tire testing.

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