## On the Dynamics of Short Pressure Probes: Some Design Factors Affecting Frequency ResponseNational Aeronautics and Space Administration, 1971 - Frequency response (Electrical engineering) - 25 pages |

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Page 4

The baffle was built into the opening of the

consisted of an annular passageway connected through a set of holes to the

inside

of ...

The baffle was built into the opening of the

**probe**as shown in figure 3. The baffleconsisted of an annular passageway connected through a set of holes to the

inside

**tube**. Four similar configurations were tested , each having different ratiosof ...

Page 6

dictions from other existing simplified

that many of these would also be adequate for

of no advantage over the simple procedure outlined in the preceding ...

dictions from other existing simplified

**tube**- and - volume analyses . It is expectedthat many of these would also be adequate for

**probe**design work , but would beof no advantage over the simple procedure outlined in the preceding ...

Page 7

for a closed

terminated

pressure

for a closed

**tube**, a minimum amplitude ratio occurred for the open and volumeterminated

**tubes**. The cyclic variation in amplitude ratio for a**probe**with averagepressure

**tubing**can be predicted from the Bergh and Tijdeman equations of ... Page 8

Dp is the inside diameter of the

diameter of the average pressure

line drawn to the right of all the data points represents a conservative estimate of

the ...

Dp is the inside diameter of the

**probe**, LA is the length , and Da is the insidediameter of the average pressure

**tube**( all dimensions are in centimeters ) . Theline drawn to the right of all the data points represents a conservative estimate of

the ...

Page 9

The prediction of the resonant frequency is within 5 percent for probes with

resonant frequencies up to 3 kilohertz . A value of 0.1 for the ratio of transducer

cavity volume to

...

The prediction of the resonant frequency is within 5 percent for probes with

resonant frequencies up to 3 kilohertz . A value of 0.1 for the ratio of transducer

cavity volume to

**probe tube**volume was felt to be a reasonable design goal ; this...

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### Common terms and phrases

amplitude ratio AMPRES Analytical curve ref approximately area ratio ARGUMENT atmospheric average pressure tube axis baffled probe basic Bergh and Tijdeman BESSEL FUNCTION BLOCK CALCULATES CALL cavity volume centimeters closed COMMON COMPLEX Computer connected CONTINUE correlation cyclic deviations DECK COMPLEX FUNCTION decrease determine diam Dimensions dynamic effects engine equation error experimental follows FREQ frequency response FUNCTION geometry given hertz holes Iberall IBFTC includes increase indicate inside diameter length less measuring systems miniature mounted parameter particle impact peak percent phase angle plotted points predict pressure measuring pressure transducer probe design probe response protection PSUM range REAL reduction reference Report resonant frequency response of probes RETURN END right angles room temperature SERIES short shown in figure simple specific heat ratio straight probe SUBROUTINE tested transient volume ratio zero