This paper presents a novel fuzzy identification method for dynamic modelling of quadrotor UAVs. The method is based on a special parameterization of the antecedent part of fuzzy systems that results in fuzzy-partitions for antecedents. This antecedent parameter representation method of fuzzy rules ensures upholding of predefined linguistic value ordering and ensures that fuzzy-partitions remai...

—In this paper an appropriate four rotors helicopter nonlinear dynamic model for identi cation and control law synthesis is obtained via modelization procedure where several phenomena are included like gyroscopic effects and aerodynamic friction. The numerical simulations of the model obtained show that the control law stabilizes the four rotors helicopter with good tracking.

Gyroscopic survey technology is one of the key technologies to promote progress directional drilling technology. It great practical significance study error well trajectory measurement based on gyro surveys and identify main sources. This paper introduces sources which lead uncertainty borehole position in gyroscopic survey, six models, calculation model contribution rate ellipse. The differenc...