BACKGROUND The current investigation examined the inter- and intra-tester reliability of knee joint angle measurements using a flexible Penny and Giles Biometric electrogoniometer. The clinical utility of electrogoniometry was also addressed. METHODS The first study examined the inter- and intra-tester reliability of measurements of knee joint angles in supine, sitting and standing in 35 heal...

In this note we will derive the equations of motion for a compound pendulum being driven by external motion at the center of rotation. A compound pendulum is a pendulum consisting of a single rigid body rotating around a fixed axis. In contrast to the simple pendulum we studied in class, a compound pendulum can have an arbitrary distribution of mass, which means that it better models real-world...

In this paper a pendulum of two degrees of freedom is investigated, i.e. a spherical pendulum which is attached to the end effector of an industrial robot manipulator. The result of the presented research is a controllable transport of the pendulum in all three dimensions. That means a real time control of the pendulum during all the time of the transport and a stable reaction of suddenly chang...

The inverted pendulum is a canonical problem in both Nonlinear Dynamics and Control Theory. In this article, the phenomenon of dynamic stabilization of the vertically driven inverted pendulum is investigated experimentally and numerically. We resolve the first stabilizing boundary in driving parameter space, as well as investigate the effects of frictional damping on the dynamics of the pendulu...

this paper deals with a globally convergent adaptive and sliding mode control of a cart-pole inverted pendulum for trajectory tracking in the presence of a bounded measurement noise and parameter uncertainty. two kinds of controllers have been used for evaluation of tracking error in presence of a bounded noise; as a result, we want to compare that at what time we can see the convergence of tra...

The mechanical properties of a boxing punch have been determined using several techniques. The results are consistent with the medical consequences of boxing discussed in the report of the Board of Science and Education Working Party on boxing. Data were gathered from a world ranked British professional heavyweight, Frank Bruno, as he punched an instrumented, padded target mass suspended as a b...

This paper describes a preliminary investigation into the use of normal form theory for modelling large non-linear dynamical systems. Limit cycle oscillations are determined for simple two-degree-of-freedom double pendulum systems. The double pendulum system is reduced into its centre manifold before computing normal forms. Normal forms are obtained using a period averaging method which is appl...

Inverted pendulum is a non-linear, multivariable and unstable device, a model predictive control (MPC) performance evaluation and tuning method for inverted pendulum device is proposed. MPC was designed to control the inverted pendulum device, and the minimum variance covariance constrained control (MVC) was applied to evaluate the performance of the MPC controller and tune its parameters. The ...