Papers by Keyword: Cubic Interpolation

Abstract: Local mean and envelope functions are obtained by moving average method in local mean deocompsition (LMD). If the moving average step length is not suitable, the calculation will be very slow. LMD based on cubic interpolation was proposed, which makes the calculation much faster. To restrain the endpoint effect, the extension model based on the mean generating function was proposed. Analysis results of simulation signal and gear fault data show that the proposed method is effective .

Abstract: The damage analysis based on the modal parameters usually need to compare the test data with the computed data by theoretical analysis. In bridge structure damage analysis, it is impossible that the sensors are set at every node. So the test data need to be extended to every node by using interpolation technology. In the paper, three interpolation methods, cubic interpolation method, cubic spline interpolation method and sinc interpolation method, are introduced. Their applications in bridge structure damage analysis are discussed. The experiment results show that the best interpolation method is cubic spline interpolation method. Using the data processed by interpolation technology can well obtain the damage location of bridge.