A stability analysis is conducted on the proposed three-time scale singular perturbation control that is applied to a Radio/Control helicopter on a platform to regulate its vertical position. The control law proposed allows to achieve the desired altitude by either selecting a desired collective pitch angle or a desired angular velocity of the blades.

We present a simplified model of planetary accretion based on conservation of mass, conservation of momentum, and angular-momentum-deficit stability. Within the limitations of this model, we show how the organization of generic planetary systems may be derived from the knowledge of their initial mass distribution. Comparisons with our Solar System and the upsilon-Andromedae planetary system are...

An angular acceleration sensor can be used for the dynamic analysis of human and joint motions. In this paper, an angular acceleration sensor with novel structure based on the principle of electromagnetic induction is designed. The method involves the construction of a constant magnetic field by the excitation windings of sensor, and the cup-shaped rotor that cut the magnetic field. The output ...

Traditionally, the automotive industry has been the largest employer of robots, but their control is inline and programmed to follow planning trajectories. In this case, in the motor's department test of Volskwagen México a semi autonomous robot is developed to generally purpose. Some critical technical problems must be solved in a number of areas, including in dynamics and control. Generally, ...

The stability of linear and angular momentum of the center of mass (CM) and the underlying coordination of body segments was investigated for a sit-to-stand task to better understand how the nervous system organizes the redundant degrees of freedom available to accomplish this task. From the effector geometry, we derived a mathematical model relating body segment angles and their angular veloci...

The stratification of entropy and the stratification of angular momentum are closely analogous. The analogy has been developed for a number of different problems in the fluid literature, but its consequences for the behavior of turbulent accretion disks are less appreciated. Of particular interest is the behavior of disks in which angular momentum transport is controlled by convection, and heat...

The stratification of entropy and the stratification of angular momentum are closely analogous. In this paper, we pursue this analogy and some of its consequences. Of particular interest is the behavior of disks in which angular momentum transport is controlled by convection, and heat transport by dynamical turbulence. In both instances we argue that the transport will proceed “backwards” relat...

BACKGROUND The water entry of a submersible aircraft, which is transient, highly coupled, and nonlinear, is complicated. After analyzing the mechanics of this process, the change rate of every variable is considered. A dynamic model is build and employed to study vehicle attitude and overturn phenomenon during water entry. Experiments are carried out and a method to organize experiment data is ...

I show the existence of a new type of vortex solution which is nonstatic but stationary and carries angular momentum. This spinning vortex can be embedded in models with trivial vacuum topology like a model with SU(2)global × U(1)local → U(1)global symmetry breaking. The stability properties of the embedded spinning vortex are also studied in detail and it is shown that stability improves drast...

We present and discuss the results from multiple Molecular Dynamics computer simulations of thermal and mechanical stability of various noble gas discs placed around a central C60 fullerene molecule. First thermal stability is evaluated by changing the temperature while holding rotation constant. Without rotation and at low-temperature argon, krypton, and xenon show completely connected discs, ...