导航

ACTA AERONAUTICAET ASTRONAUTICA SINICA ›› 2013, Vol. 34 ›› Issue (1): 187-196.doi: 10.7527/S1000-6893.2013.0022

• Material Engineering and Mechanical Manufacturing • Previous Articles    

Grey-box Modeling of Hydraulic Servo Systems Based on ODE Parameter Identification

ZHAO Pan1,2, WANG Shaoping1,2   

  1. 1. School of Automation Science and Electrical Engineering, Beihang University, Beijing 100191, China;
    2. Science and Technology on Aircraft Control Laboratory, Beihang University, Beijing 100191, China
  • Received:2012-03-05 Revised:2012-07-17 Online:2013-01-25 Published:2013-01-19
  • Supported by:

    National Natural Science Foundation of China (51175014)

Abstract:

In view of the fact that white-box modeling cannot supply an accurate model due to the unavailability of accurate parameters and that black-box model structure is unknown, this paper tries to implement a grey-box modeling of hydraulic servo systems utilizing ODE parameter identification. A practical state space model of the system is first constructed, and parameters that need to be estimated are then defined. Parameter identification is carried out utilizing sine sweep data and the initial value problem approach (IVPA) based on trust region method (TRM) which is able to handle the bound constraints on the parameters. Black-box transfer function models are also acquired utilizing frequency response data to compare with the results of ODE parameter identification. Finally, extensive experiments are performed to testify the quality of the identified models. Experiment results show that the proposed method for identifying hydraulic servo systems based on TRM is able to handle parameter bounds effectively, which results in a model that is not only physically reasonable, but also corresponds highly with the practical system.

Key words: hydraulic servo system, grey-box modeling, ordinary differential equations, parameter identification, trust region, bound constraint

CLC Number: