scholarly journals PERTURBATIVE APPROACH FOR FAST AND ACCURATE EVALUATION OF QUASI AXIALLY-SYMMETRIC CAVITY RESONANCE FREQUENCY IN DRIFT TUBE LINACS

2020 ◽  
Vol 93 ◽  
pp. 109-118
Author(s):  
Giorgio Sebastiano Mauro ◽  
Santi Concetto Pavone ◽  
Giuseppe Torrisi ◽  
Antonio Palmieri ◽  
Luigi Celona ◽  
...  
Keyword(s):  
Resonance Frequency ◽  
Drift Tube ◽  
Cavity Resonance ◽  
Axially Symmetric ◽  
Perturbative Approach ◽  
Accurate Evaluation ◽  
Symmetric Cavity

scholarly journals Absence of saturation for finite injected currents in axially symmetric cavity diode

2003 ◽  
Vol 10 (11) ◽  
pp. 4521-4529 ◽  
Author(s):  
Debabrata Biswas ◽  
Raghwendra Kumar ◽  
R. R. Puri
Keyword(s):  
Axially Symmetric ◽  
Symmetric Cavity

scholarly journals Time series measurement of flow in an axially symmetric cavity by high-speed-video PIV

1999 ◽  
Vol 19 (Supplement2) ◽  
pp. 141-144
Author(s):  
Kenji Hosoi ◽  
Masaaki Kawahashi ◽  
Kouzyu Shiozaki ◽  
Hiroyuki Hirahara ◽  
Kennichirou Sato
Keyword(s):  
Time Series ◽  
High Speed ◽  
Axially Symmetric ◽  
High Speed Video ◽  
Symmetric Cavity ◽  
Series Measurement ◽  
Time Series Measurement

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.

scholarly journals On the Mechanism of Cavitation Damage by Nonhemispherical Cavities Collapsing in Contact With a Solid Boundary

1961 ◽  
Vol 83 (4) ◽  
pp. 648-656 ◽  
Author(s):  
Charl F. Naude´ ◽  
Albert T. Ellis
Keyword(s):  
High Speed ◽  
Cavity Wall ◽  
Solid Boundary ◽  
Cavity Volume ◽  
Axially Symmetric ◽  
Cavitation Damage ◽  
Fluid Theory ◽  
Symmetric Cavity ◽  
Theory And Experiment ◽  
Collapse Process

A perfect fluid theory, which neglects the effect of gravity, and which assumes that the pressure inside a cavitation bubble remains constant during the collapse process, is given for the case of a nonhemispherical, but axially symmetric cavity which collapses in contact with a solid boundary. The theory suggests the possibility that such a cavity may deform to the extent that its wall strikes the solid boundary before minimum cavity volume is reached. High-speed motion pictures of cavities generated by spark methods are used to test the theory experimentally. Agreement between theory and experiment is good for the range of experimental cavities considered, and the phenomenon of the cavity wall striking the solid boundary does indeed occur. Studies of damage by cavities of this type on soft aluminum samples reveals that pressures caused by the cavity wall striking the bounda y are higher than those resulting from a compression of gases inside the cavity, and are responsible for the damage.

Research on split and evolution of acoustic cavity resonance frequency of rotating loaded tire

2021 ◽  
pp. 107754632110482
Author(s):  
Xiaojun Hu ◽  
Xiandong Liu ◽  
Yingchun Shan ◽  
Tian He
Keyword(s):  
Resonance Frequency ◽  
Cavity Resonance ◽  
Inflation Pressure ◽  
Passenger Compartment ◽  
Order Resonance ◽  
First Order ◽  
Acoustic Cavity ◽  
New Findings ◽  
Resonance Frequencies ◽  
Simulation And Experiment

The tire acoustic cavity resonance noise (TACRN) is known to contribute to audible noise in the passenger compartment of a vehicle. In order to reduce TACRN effectively, its mechanism needs to be grasped better. In this paper, the calculation formulas of tire acoustic cavity resonance frequency for four different conditions such as static unloaded tire, static loaded tire, rotating unloaded tire, and rotating loaded tire are analyzed and verified by the simulation and experiment. In particular, the resonance frequency formulas of static loaded tire introducing inflation pressure and rotating loaded tire are proposed and verified, respectively, in this paper. And the influence of tire inflation pressure, load, and running velocity on splitting frequency are studied. Some new findings are described and discussed; for example, the first-order resonance frequency may split into four resonance frequencies in most cases, and may split into three resonance frequencies in certain cases when a loaded tire is rotating. And the existing conditions for three and four resonance frequencies are also discussed.

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