ARMA (Autoregressive Moving Average) model order determination method based on steady state graph
A determination method and technology of steady-state diagrams, applied in special data processing applications, measuring devices, instruments, etc., can solve problems such as the inconsistency between the order determination of the ARMA model and the actual situation, and achieve the effect of narrowing the scope and improving the determination accuracy
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[0021] The present invention will be described in detail below in conjunction with the drawings.
[0022] Reference figure 1 , A method for determining the minimum order of the ARMA model, including the following steps:
[0023] 1) Use the acceleration sensor to test the acceleration of the experimental object, and get the response signal x(N), where N is the number of sampling points, and N is an integer greater than zero;
[0024] 2) Establish an ARMA(p, q) model for the response signal x(N) and estimate the model parameters. For mechanical systems, the order of the autoregressive part of the ARMA model is 2n, where n is the number of degrees of freedom of the system. The establishment of the ARMA model adopts the most widely used (2n, 2n-1) scheme in engineering, that is, the establishment of an ARMA (2n, 2n-1) model, then p=2n, q=2n-1;
[0025] 3) ARMA model order (p, q) from low to high, calculate the modal frequency under different orders, take the modal frequency as the absci...
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