Strain gage balance signal filtering with piecewise representations
Journal Title: INCAS BULLETIN - Year 2019, Vol 11, Issue 2
Abstract
Strain gage balances provide the most important output of the supersonic wind tunnels. Typically, the time histories of the six forces/moments components must be filtered out, to provide useful results for performance assessment of the models. Various filtering models do exist, from basic regressions, to frequency domain and combinations of piecewise fit polynomials. Results with decoupled piecewise linear fit (moving window) showed the need of more suitable methods, namely piecewise, that must properly connect the neighboring fit curves, to provide continuity up to the first derivative. A polygonal line fit is derived and modified for increased smoothness. A third order cubic spline is derived, offering connectivity up to the first derivative. A fifth order spline is derived with continuity up to the second order derivative. Filtering results are shown for real and synthetic sets of data with conclusions.
Authors and Affiliations
Mihai-Victor PRICOP, Sarif OMAR, Ionut BUNESCU, Alexandru Marius PANAIT
Keywords
Related Articles
- EP ID EP585290
- DOI 10.13111/2066-8201.2019.11.2.10
- Views 66
- Downloads 0
Determination of angle of attack for rotating blades
For a rotating blade the flow passing by a blade section is bended due to the rotation and the local flow field is influenced by the bound circulation on the blade. As a further complication, 3-D effects from tip and roo...
[b]SCIENTIFIC BASIS OF COANDA’S WORK IN 1910[/b]
Computing Method of Forces on Rivet
This article aims to provide a quick methodology of forces calculation on rivet in single shear using the finite element method (FEM) – NASTRAN/PATRAN. These forces can be used for the calculus of bearing, inter rivet bu...
Environmental mobile robot based on artificial intelligence and visual perception for weed elimination
This research presents a new editing design for the pioneer p3-dx mobile robot by adding a mechanical gripper for eliminating the weed and a digital camera for capturing the image of the field. Also, a wireless kit that...
Flow visualization techniques, new developments and modernization of the existing Schlieren system in the Trisonic Wind Tunnel
Schlieren flow visualization methods are an important part of high speed wind tunnel testing, being a fast and reliable method of graphically presenting complex dynamic phenomena that occur in high subsonic, transonic an...