Acta mathematica scientia,Series A ›› 2019, Vol. 39 ›› Issue (5): 1205-1212.

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Influence Mechanism of the Mean Values on POD Method

Cao Yanhua1, Li Nan1, Chen Mengcheng2   

  1. 1 School of Sciences, East China Jiaotong University, Nanchang 330013;
    2 Institute of Architecture and Civil Engineering, East China Jiaotong University, Nanchang 330013
  • Received:2018-06-21 Revised:2018-12-17 Published:2019-11-08
  • Supported by:
    Supported by the NSFC(11461026,11661036,51378206)

Abstract: The proper orthogonal decomposition (POD) has been known as an efficient reduction technique in simulating physical process which governed by partial differential equations. In this paper, the basic properties of time coefficients in POD method are studied. Based on the theories and matrix analysis, by introducing the cross-correlation matrix (CROM) of the whole signals and the covariance matrix of the fluctuating parts of signals (in which the mean values have been cancelled, COVM), we derive the influence mechanism of mean values on the POD method in theory. There are fewer relevant studies in previous works. Finally, numerical examples are provided for verification and demonstration the influence mechanism in POD process.

Key words: POD method, Mean values, Whole signals

CLC Number: 

  • O324