Title : 
A technique for the analysis of time-varying sampled-data systems
         
        
            Author : 
Friedland, Bernard
         
        
            Author_Institution : 
Columbia University, New York, N. Y.
         
        
        
        
        
        
        
            Abstract : 
MUCH OF THE LITERATURE in the field of feedback control has been concerned with linear, time-invariant systems. The labor involved in obtaining solutions to even simple problems in time-varying systems may well have discouraged research in this area. Nevertheless, many practical systems unavoidably contain time-varying components, and methods of dealing with such systems are desirable.
         
        
            Keywords : 
Control systems; Data systems; Equations; Feeds; Numerical analysis; Time varying systems; Vectors;
         
        
        
            Journal_Title : 
American Institute of Electrical Engineers, Part II: Applications and Industry, Transactions of the
         
        
        
        
        
            DOI : 
10.1109/TAI.1957.6367266