Determining the area of a technical system stability in fuzzy sets terms

Ensuring the stability of technical systems functioning, including those in water transport, is an important area for application mathematical methods, probabilistic and mathematical-statistical methods. The stochastic nature disturbances affecting complex worsening level latter should be reflected implemented human-machine control loops. One directions here accounting use (usually competing) expert assessments, on one hand, a reasonable definition indicators, choice from variety possibilities, other hand. From general point view management theory, method using assessments developed paper can considered as integral part risk problem that being so far, mainly economic only financial criteria. concept minimum allowable efficiency system introduced paper. On its basis, approach which indicator linked to system-wide criterion quality functioning implemented. corresponding model mathemati- cal programming formulated. Approaches solution nonconvex multiextremal case are discussed. A feature proposed dynamics determining probable range changes controlled variables optimization model, problem, logically leads fuzzy set theory. With non-linearity objective functions restrictions arise this case, gradient searching conditional optimum effective.