Approximation method for a fractional order transfer function with zero and pole

The paper presents an approximation method for elementary fractional order transfer func-tion containing both pole and zero. This class of transfer functions can be applied for exampleto build model - based special control algorithms. The proposed method bases on Charef ap-proximation. The problem of cancelation pole by zero with useful conditions was considered,the accuracy discussion with the use of interval approach was done also. Results were depictedby examples.Key words: fractional order systems, fractional order transfer function, Charef approxi-mation

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