Journal of System Simulation ›› 2015, Vol. 27 ›› Issue (4): 738-746.

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State Event Detecting Algorithm for Hybrid System Based on Interval Newton's Method

Wang Haiyan, Hu Yihuai   

  1. Merchant Marine College, Shanghai Maritime University, Shanghai 201306, China
  • Received:2014-08-20 Revised:2014-10-21 Published:2020-08-20

Abstract: Accurately detecting of state events is critical for hybrid dynamic systems,especially for systems with singularities or event functions with multiple roots. A carefully constructed extrapolation polynomial among state value of past time points was applied to predict values of event functions. The polynomial was derived from a variable-step multi-step integration method. The extended interval Newton's method was employed to find all roots in a certain time interval. Due to no using of values of future time points, the polynomial can be employed to determine the integration step size by checking potential events in systems with model singularities. The procedure of root existence test and root finding was combined into one procedure by using of non-existence test of roots. Simulation results show the algorithm is effective for hybrid dynamic systems with several different critical situations. By this algorithm, model singularities are found on time and simulation failures are avoided.

Key words: hybrid system, state event detecting, vary step multi-step method, state event function predicting, interval Newton's method

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