dynamic pressure calibration of a tubing systempeel/sdu_sophomores/2016posters... · 2016. 8....

- Develop an experiment device for

generating a signal in tubing systems

- Record pressure signals at given

frequencies through long and short

tubes generated by the device

- Calculate the amplitude ratio and

phase lag between pressure signals of

short and long tubes with respect to

frequency range of interest

- Compare with theoretical predictions

for their validation

signal

- Run speaker from 30-300 Hertz by steps of

2 Hertz

- Speaker frequency response 27-500Hz

- Scan at each frequency for 30 seconds at a

sampling rate of 625 Hz

- Nyquist frequency: max frequency should

be at most half the sampling rate

- Pressure scanner automated with LabVIEW

software

Research Plan

Cross section of

speaker box

- James Ratino designed pressure generator;

speaker in box

- Creates pressure fluctuations in the air

- Based on design by Kirby Herbert for James

Gregg’s Thesis: Development and application of

methods for Evaluation of hurricane shelters

- Connect to computer to generate sinusoidal

waves

Experimental Procedure

Kicker.com

Dynamic Pressure Calibration of

a Tubing SystemLuke Amatuccilukeamatucci@gmail.com

Aerospace Engineering

Science, Discovery, and the Universe

Division 731

- Large external wind loads can cause

structures to fail

- Forces are due to large pressure gradients

that occur due to structures’ aerodynamics

nasa.gov http://www.floridahurricaneclaim.org/

- Model used to collect data inside of a wind

tunnel to better understand bluff body flow

- Dynamic pressure measured with pressure

transducer

- Transducer placed inside model measures

pressure across model’s surface

Wind

Model

Transducer

Background

The Problem

- When measuring the pressure with the

transducer we must use long tubes to

connect to the models surface

- The long tubes create distortion in the

signal

Photo Cr. L. Amatucci Photo Cr. L. Amatucci

Photo Cr. L. AmatucciScanivalve.com

Photo Cr. L. Amatucci

- Using LabView program to collect data

and Matlab to analyze data

- Fast Fourier Transform(FFT)

- Converts signal from time domain to

frequency domain

Data Analysis

Results

- Comparing our theoretical ratio

between the short and the long tube to

the recorded ratio we see the trend is

spot on

- These results validate the theoretical

predictions and shows they are true to

our experiments

Acknowledgements: Dr. DongHun Yeo, Matthew Kovarek, James Ratino, Dr. Marc Levitan, Chongqing Fan, Ryan Pemberton and Drew Tkac- Scanivalve, Dr. Eric Lemmon – REFPROP (NIST Boulder)

Photographer: Levick, Edwin

My time at NIST gave me incredible experience in

working in a lab and engineering environment

where my input was very important