—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.

We provide a uniform treatment of electromagnetic and gravitational memory effects, based on the gravito-electromagnetic formulation GR generalization geodesic deviation equation. This allows us to find novel results: in gauge theory, we derive relativistic corrections well-known kick observable, general expression for displacement typically overlooked literature. In GR, observables. both theor...

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...

the study of the dynamic behavior of a rigid body with one fixed point (gyroscope) has a long history. a number of famous mathematicians and mechanical engineers have devoted enormous time and effort to clarify the role of dynamic effects on its movement (behavior) – stable, periodic, quasi-periodic or chaotic. the main objectives of this review are: 1) to outline the characteristic features of...