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AN EARLIER PAPER1 introduced a method for handling multiple nonlinearities through describing functions, and developed such describing functions for single-stage electrohydraulic control valves. This work is extended in this paper to 2-stage valves of the type shown in Fig. 1. Most of the essential nonlinearities are included in the describing function which is brought to a form similar to that for the single-stage valve.1 Precalculated charts are utilized which help to make reasonable the amount of labor of computing the describing function for a specific valve. An example in the paper illustrates the use of the describing function, and very good agreement with analog computer studies is demonstrated.
American Institute of Electrical Engineers, Part II: Applications and Industry, Transactions of the (Volume:76 , Issue: 6 )
Date of Publication: Jan. 1958