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   Improving the asymptotic properties of discrete system zeros in fractional-order hold case  
   
نویسنده zeng c. ,liang s. ,su y.
منبع journal of applied mathematics - 2013 - دوره : 2013 - شماره : 0
چکیده    Remarkable improvements in the asymptotic properties of discrete system zeros may be achieved by properly adjusted fractional-order hold (froh) circuit. this paper analyzes asymptotic properties of the limiting zeros,as the sampling period t tends to zero,of the sampled-data models on the basis of the normal form representation of the continuous-time systems with froh. moreover,when the relative degree of the continuous-time system is equal to one or two,an approximate expression of the limiting zeros for the sampled-data system with froh is also given as power series with respect to a sampling period up to the third-order term. and,further,the corresponding stability conditions of the sampling zeros are discussed for fast sampling rates. the ideas of the paper here provide a more accurate approximation for asymptotic zeros,and certain known achievements on asymptotic behavior of limiting zeros are shown to be particular cases of the results presented. © 2013 cheng zeng et al.
آدرس college of automation,chongqing university,chongqing 400044,china,department of mathematics,guiyang university, China, college of automation,chongqing university,chongqing 400044,china,key laboratory of dependable service computing in cyber physical society ministry of education,chongqing university, China, college of automation,chongqing university,chongqing 400044,china,department of electric and electronic information engineering,chongqing university of science and technology, China
 
     
   
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