In this paper dynamic damping properties of a nominated flexible structural adhesive have been identified using an extended-direct modal based joint identification method. It has been revealed that damping characteristics of adhesive are correlated to both frequency and mode shape. Young’s and shear moduli increase with frequency but damping on the other hand, decrease. The results showed that ...

Modern fire-rescue turntable ladders are constructed in a lightweight mode to increase their maximum operation velocities, maximum length, and outreach respectively. Hence, the ladder has a limited stiffness and will be more and more subject to oscillations of deflection along with dominant overtones. This paper deals with the active oscillation damping of such ladders. A new feedforward and fe...

The rms beam envelope oscillations, risen from the mismatching of high intensity beams propagating along periodic focusing cells, can induce a halo formation. In some case, a very fast oscillation damping, due in all probability to a Landau mechanism of stabilization, can occur minimizing the halo extent generated. In this paper the possibility of using this fast damping to contain the halo for...

Satisfactory damping of power oscillations is an important issue to be addressed when dealing with the angle stability of power systems. This phenomenon is well-known and observable especially when a fault occurs. To improve the damping of oscillations in power systems, supplementary control laws can be applied to existing devices. These supplementary actions are referred to as power oscillatio...

Using generalized Riccati transformations, we derive new interval oscillation criteria for a class of general type second-order nonlinear differential equations with nonlinear damping. Examples are also given to illustrate the results. 2000 Mathematics Subject Classification: 34C10

Studies of raindrop shapes, oscillation modes, and implications for radio wave propagation are presented. Drop shape measurements in natural rain using 2-D video disdrometers (2DVDs) are discussed. As a representative exception to vast majority of the cases where the “most probable” shapes conform to the axisymmetric (2,0) oscillationmode, an event with a highly organized line convection embedd...

In this paper, two different approaches are applied to the Kundur two-area four machines network in order to select the most effective signals to damped out the inter-area oscillations. The robustness analysis, simulations and different results show that in the case of wide-area signals selection, the geometric approach is more reliable and usefull the the residue approach.Also, the result conf...

In this paper, the voltage sag ride-through capabilities of the line-connected electrically excited synchronous machine with damper windings (EESM) is investigated. We will design an algorithm for voltage sag ride through by controlling the flux. Two aspects are investigated, first the capability to keep the nominal speed and second the damping of speed oscillations. We will show through simula...

Summary Modern power networks are enormously complex and frequently interconnected by weak tie‐lines, which results in a variety of stability issues such as low frequency oscillations (LFOs). LFOs can have negative impact on system tie‐line transmission capacity, resulting catastrophic blackouts if suitable damping control mechanisms not situ. This article demonstrates robust design for inter‐a...