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Assessing Cerebral Autoregulation via Oscillatory Lower Body Negative Pressure and Projection Pursuit Regression

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Frequency analysis of a step dynamic pressure calibrator.

In-Mook Choi¹, Inseok Yang, Tae-Heon Yang

¹Division of Physical Metrology, Korea Research Institute of Standards and Science (KRISS), 267 Gajeong-ro, Yuseong-gu, Daejeon 305-340, South Korea.

The Review of Scientific Instruments

|October 2, 2012

Summary

Developing a reliable dynamic high pressure standard is crucial for defense and aerospace. This study addresses oscillations in dynamic pressure calibrators, proposing methods to improve accuracy and system longevity for critical applications.

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Area of Science:

* Mechanical Engineering
* Metrology
* Aerospace Engineering

Background:

* Accurate dynamic high pressure measurement is increasingly vital for mobile engines, space science, and defense applications like missile development.
* Calibrating dynamic pressure sensors using static mode reference gauges presents significant challenges.
* Existing dynamic high pressure calibrators, while fast, introduce oscillations and impulse forces, impacting system life and measurement accuracy.

Purpose of the Study:

* To analyze and characterize the sources of unwanted resonant frequencies in dynamic high pressure calibration systems.
* To propose methods for mitigating these oscillations and improving the fidelity of dynamic pressure signals.
* To enhance the reliability and accuracy of dynamic pressure calibration for critical applications.

Main Methods:

* Utilized frequency analysis to identify and characterize extraneous resonant frequencies generated by the calibrator.
* Employed post-processing filtering techniques to remove unwanted frequency components from the pressure signal.
* Investigated modifications to the dynamic calibration system to suppress oscillations at their source.

Main Results:

* Identified main sources of resonance in dynamic high pressure calibration systems, distinct from the primary step function.
* Demonstrated the effectiveness of post-processing filters in removing unnecessary resonant frequencies.
* Characterized the impulse forces and oscillating characteristics introduced by quick-opening ball valve calibrators.

Conclusions:

* Unnecessary resonant frequencies significantly complicate accurate dynamic high pressure calibration.
* Frequency analysis and filtering are effective in improving the quality of dynamic pressure signals.
* System modifications are proposed to enhance the performance and lifespan of dynamic calibration systems.