Effect of yaw on pressure oscillation frequency within rectangular cavity at Mach 2

AIAA Journal ◽  
1997 ◽  
Vol 35 ◽  
pp. 1233-1235 ◽  
Author(s):  
Peter J. Disimile ◽  
Paul D. Orkwis
Keyword(s):  
Oscillation Frequency ◽  
Pressure Oscillation ◽  
Rectangular Cavity

Effect of Yaw on Pressure Oscillation Frequency Within Rectangular Cavity at Mach 2

AIAA Journal ◽  
10.2514/2.225 ◽  
1997 ◽  
Vol 35 (7) ◽  
pp. 1233-1235 ◽  
Author(s):  
Peter J. Disimile ◽  
Paul D. Orkwis
Keyword(s):  
Oscillation Frequency ◽  
Pressure Oscillation ◽  
Rectangular Cavity

High-Speed Visualization of the Oscillatory Supersonic Flow Over a Rectangular Cavity

2011 ◽  
Author(s):  
Taro Handa ◽  
Hiroaki Miyachi ◽  
Hatsuki Kakuno ◽  
Takaya Ozaki
Keyword(s):  
Supersonic Flow ◽  
Pressure Wave ◽  
High Speed ◽  
Pressure Oscillation ◽  
Rectangular Cavity ◽  
Schlieren Method ◽  
Trailing Edge ◽  
The Relationship ◽  
Type Pressure ◽  
Semiconductor Type

A mechanism of cavity-induced pressure oscillation in supersonic flows is not well understood in spite of a lot of former investigations. Especially, the process by which the pressure wave is generated and the path of the pressure wave propagating inside the cavity remain unclear. In order to clarify these, the oscillatory behaviors in the supersonic flow over a rectangular cavity are visualized by the schlieren method with a high-speed camera in the present study. The inlet Mach number of the flow is 1.68. The length and depth of the cavity are 14.0mm and 11.7mm respectively; i.e., the length-to-depth ratio of the cavity is 1.20. The pressure oscillation near the trailing edge of the cavity is also measured by use of the semiconductor-type pressure transducer simultaneously with the visualization. As a result, the pressure waves propagating inside as well as outside the cavity are successfully visualized. In addition, the relationship between the shear layer displacement, pressure wave generation and pressure oscillation at the trailing edge of the cavity are clarified experimentally.

scholarly journals Regulation of dynamic postural control to attend manual steadiness constraints

2018 ◽  
Vol 120 (2) ◽  
pp. 693-702 ◽  
Author(s):  
Luis Augusto Teixeira ◽  
Joane de Figueiredo Serpa Coutinho ◽  
Daniel Boari Coelho
Keyword(s):  
Postural Control ◽  
Oscillation Frequency ◽  
Postural Stability ◽  
Center Of Pressure ◽  
Center Of Mass ◽  
Pressure Oscillation ◽  
Task Constraint ◽  
Task Constraints ◽  
Manual Task ◽  
High Oscillation Frequency

In daily living activities, performance of spatially accurate manual movements in upright stance depends on postural stability. In the present investigation, we aimed to evaluate the effect of the required manual steadiness (task constraint) on the regulation of dynamic postural control. A single group of young participants ( n = 20) were evaluated in the performance of a dual posturo-manual task of balancing on a platform oscillating in sinusoidal translations at 0.4-Hz (low) or 1-Hz (high) frequencies while stabilizing a cylinder on a handheld tray. Manual task constraint was manipulated by comparing the conditions of keeping the cylinder stationary on its flat or round side, corresponding to low and high manual task constraints, respectively. Results showed that in the low oscillation frequency the high manual task constraint led to lower oscillation amplitudes of the head, center of mass, and tray, in addition to higher relative phase values between ankle/hip-shoulder oscillatory rotations and between center of mass/center of pressure-feet oscillations as compared with values observed in the low manual task constraint. Further analyses showed that the high manual task constraint also affected variables related to both postural (increased amplitudes of center of pressure oscillation) and manual (increased amplitude of shoulder rotations) task components in the high oscillation frequency. These results suggest that control of a dynamic posturo-manual task is modulated in distinct parameters to attend the required manual steadiness in a complex and flexible way. NEW & NOTEWORTHY We evaluated dynamic postural control on a platform oscillating in sinusoidal translations at different frequencies while performing a manual task with low or high steadiness constraints. Results showed that high manual task constraint led to modulation of metric and coordination variables associated with greater postural stability. Our findings suggest that motor control is regulated in an integrative mode at the posturo-manual task level, with reciprocal interplay between the postural and manual components.

scholarly journals COMPUTATION OF OSCILLATION FREQUENCY IN A PLASMA FILLED RECTANGULAR CAVITY RESONATOR

2021 ◽  
Vol 100 ◽  
pp. 127-140
Author(s):  
Pragya Shilpi ◽  
Dharmendra Upadhyay ◽  
Harish Parthasarathy
Keyword(s):  
Oscillation Frequency ◽  
Cavity Resonator ◽  
Rectangular Cavity
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