The control objectives in this paper are to move the gantry of a container crane to its target position and to suppress the transverse vibration of the payload. The crane system is modeled as an axially moving string equation, in which control inputs are applied at both ends, through the gantry and the payload. The dynamics of the moving string are derived using Hamilton’s principle for systems...

This article presents a new analysis of the vibration characteristics open-edge cracks for graded moving beams under thermal load. The material property gradient is based on distribution power law in direction beam thickness. equation obtained depending precept Hamilton and resolved by extension Galerkin’s approach. A rotational spring used to represent cracking beam. effects axial velocity, in...

In this paper, we are interested to stabilize an axially moving string subject external disturbances. We assume that the disturbance may increases exponentially. employ active rejection control (ADRC) approach estimate disturbance. design a observer has time-varying gain so can be estimated with exponential way. order closed loop system, use constructed through high-gain adaptive velocity feedb...

The paper analyzes the summation of powers two sources in a hemispherical open resonator (OR) during its tuning. first higher axially asymmetric TEM10q oscillation mode is excited resonator. A circuit with an E- tee waveguide proposed, which makes it possible to research using Gunn diode. Studies conducting part millimeter range have been undertaken. It shown that coefficient OR slot coupling e...

An axially-symmetric sheared polymer network liquid crystal (SPNLC) device is demonstrated and its performances characterized. Through analyzing the structure of this axially-symmetric SPNLC, we constructed a 3-D model to explain the observed phenomena. The simulation results agree well with the experiment. Two potential applications of such an axially-symmetric SPNLC, namely tunable-focus nega...