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3 edition of Comparison of interpolation methods as applied to time synchronous averaging found in the catalog.

Comparison of interpolation methods as applied to time synchronous averaging

Comparison of interpolation methods as applied to time synchronous averaging

  • 341 Want to read
  • 23 Currently reading

Published by National Aeronautics and Space Administration, Glenn Research Center, National Technical Information Service, distributor in [Cleveland, Ohio], [Springfield, Va .
Written in English

    Subjects:
  • Interpolation.,
  • Vibration.,
  • Gears.,
  • Data acquisition.

  • Edition Notes

    StatementHarry J. Decker, James J. Zakrajsek.
    SeriesNASA/TM -- 1999-209086., NASA technical memorandum -- 209086.
    ContributionsZakrajsek, James J., NASA Glenn Research Center.
    The Physical Object
    FormatMicroform
    Pagination1 v.
    ID Numbers
    Open LibraryOL15557163M

    This is shown on the right for 3 dimensions for all but the cosine interpolation. By a cute trick the cosine interpolation reverts to linear if applied independently to each coordinate. For other interpolation methods see the Bezier, Spline, and piecewise Bezier methods here. Linear. Cosine. Cubic. Hermite. 3D linear. 3D cubic. 3D Hermite. motivates calling () the secant method, because it is just Newton’s method with the secant approximation of f00(x k) instead. Method 3. Our third method is the 3 point method. Choose 3 points, 2 endpoints to bracket our critical point, and then a point within the interval as well. Using the Lagrange Interpolation formula, we can.

    Interpolation returns an InterpolatingFunction object, which can be used like any other pure function.; The interpolating function returned by Interpolation [data] is set up so as to agree with data at every point explicitly specified in data.; The function values f i can be real or complex numbers, or arbitrary symbolic expressions.; The f i can be lists or arrays of any dimension. The most commonly used interpolation method for a regular grid DEM is patchwise polynomial interpolation. The general form of this equation for surface representation is: where h i is the height of an individual point i, x and y are its rectangular coordinates of i, and a 00, a 10, a 01, , a mn are the coefficients of the polynomial.

      Computer Methods in Applied Mechanics and Engineering , () Fast Multi-Objective Aerodynamic Optimization Using Sequential Domain Patching and Multifidelity Models. Journal of Aircraft , processed can be converted to a discrete-time signal, processed by a discrete-time system, and then converted back to a continuous-time signal. In develop-ing insight into this process, it is important to clearly understand in both the time and the frequency domains the process of converting from a continuous-time signal to a sequence of samples.


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Comparison of interpolation methods as applied to time synchronous averaging Download PDF EPUB FB2

Comparison of Interpolation Methods as Applied to Time Synchronous Averaging Article (PDF Available) July with 97 Reads How we measure 'reads'.

Get this from a library. Comparison of interpolation methods as applied to time synchronous averaging. [Harry J Decker; James J Zakrajsek; NASA Glenn Research Center.]. The available interpolation methods are listed below.

IDW. The IDW (Inverse Distance Weighted) tool uses a method of interpolation that estimates cell values by averaging the values of sample data points in the neighborhood of each processing cell.

The closer a point is to the center of the cell being estimated, the more influence, or weight. Time Synchronous Average (TSA) is an essential algorithmic tool for determining the condition of rotating equipment.

Given its significance to diagnostics, it is important to understand the. Interpolation Methods Comparison Table 5. Environmental cases: average interpolation indices per method version. 1 K 1 1 1 1 1 K 1 1 1 1 1 K 1 1 1 1 I I I I Table 6. Literature cases: average interpolation indices per method by: [1] We compare versions of six interpolation methods for the interpolation of daily precipitation, mean, minimum and maximum temperature, and sea level pressure from station data over Europe from to The interpolation methods evaluated are global and local kriging, two versions of angular distance weighting, natural neighbor interpolation.

The algorithm of Newton's method and its implementation can be found in this iPython notebook. Lagrange Form. Lagrange polynomial is another form used for polynomial interpolation. It is called a form because with a given set of distinct points the interpolating polynomial is unique.

We can arrive at the same polynomial through different methods. Interpolation Methods. Interpolation is the process of using points with known values or sample points to estimate values at other unknown points. It can be used to predict unknown values for any geographic point data, such as elevation, rainfall, chemical concentrations, noise levels, and so on.

The available interpolation methods are listed. J.S. Carlton FREng, in Marine Propellers and Propulsion (Fourth Edition), Three-Dimensional Extrapolation Method.

The three-dimensional extrapolation method is based on the form factor concept. Accordingly, the resistance is scaled under the assumption that the viscous resistance of the ship and its model is proportional to the frictional resistance of a flat plate of. applied to the same discrete data set, different fields are generated.

This study was undertaken to identify and test computationally efficient methods for inter­ polating sparse data measurements onto a regular mesh.

A survey of methods for interpolation of sparse data a. Weighted interpolation methods. trapolation method regards the recorded or calculated radiation at a nearby site as the value at an unobserved site if the distance between the two sites falls below a certain value.[8,24] When a network of meteorological stations exists, spatial interpolation methods, such as geometric interpolation and geostatistics method, can be used.

Spatial interpolation has been widely and commonly used in many studies to create surface data based on a set of sampled points, such as soil properties, temperature, and precipitation.

Currently, there are many commercial Geographic Information System (GIS) or statistics software offering spatial interpolation functions, such as inverse distance weighted.

Geostatistical Analyst is a set of advanced tools for analysing spatial data and generating surface models using statistical and deterministic methods available in ESRI ArcMap software. It enables interpolation models to be created on the basis of data measured at chosen points.

The software also provides tools that enable analyses of the data variability, setting data limits and checking. The statistical errors (i.e., mean error, root-mean-square error, average standard error, mean standardized error, and root-mean-square standardized error) of the resulting output were then compared to determine the most suitable combination of linear spatial interpolation and variogram algorithms for each of the data sets.

Interpolation search is an algorithm for searching for a key in an array that has been ordered by numerical values assigned to the keys (key values).It was first described by W.

Peterson in Interpolation search resembles the method by which people search a telephone directory for a name (the key value by which the book's entries are ordered): in each step the algorithm.

On the comparison of interpolation methods Abstract: A study of different cubic interpolation kernels in the frequency domain is presented that reveals novel aspects of both cubic spline and cubic convolution interpolation.

The kernel used in cubic convolution is of finite support and depends on a parameter to be chosen at will. that are closer to interpolation point have more influence (weight), during the computations, in comparison with faraway ones, according to the First Law of Geography (Tobler, ).

Interpolators could be defined as weighted average methods, with similar processing concept; the operator, in fact, needs to. Numerical analysis, area of mathematics and computer science that creates, analyzes, and implements algorithms for obtaining numerical solutions to problems involving continuous variables.

Such problems arise throughout the natural sciences, social sciences, engineering, medicine, and business. Since the mid 20th century, the growth in power and availability of. A time series is a series of data points indexed (or listed or graphed) in time order.

Most commonly, a time series is a sequence taken at successive equally spaced points in time. Thus it is a sequence of discrete-time data. Examples of time series are heights of ocean tides, counts of sunspots, and the daily closing value of the Dow Jones Industrial Average.

This is true, and the above interpolation-by-M process applied to time signals is sometimes called exact interpolation—because its performance is equivalent to using an ideal, infinite-stopband attenuation, time-domain interpolation filter—and has made its way into DSP textbooks, journal articles, and classroom notes of famous DSP professors.

omitted. The application of Lagrangian interpolation will be clarified using an example. Example 1 The upward velocity of a rocket is given as a function of time in Table 1. Table 1 Velocity as a function of time. t (s) v t () (m/s) 0 0 10 15 20 30x y 0 0, x y 1 1, x y 2 2, x y 3 3 f x x y.INTERPOLATION Outputs typically: Raster surface •Values are measured at a set of sample points •Raster layer boundaries and cell dimensions established •Interpolation method estimate the value for the center of each unmeasured grid cell Contour Lines Iterative process •From the sample points estimate points of a value Connect these points to form a line.

Extrapolation and interpolation are both used to estimate hypothetical values for a variable based on other observations. There are a variety of interpolation and extrapolation methods based on the overall trend that is observed in the two methods have names that are very similar.