A discrete-time internal model principle based adaptive algorithm for identifying signals composed of a sum of exponentially damped sinusoids is presented. The time varying state variables of an internal model principle controller in a feedback loop can provide estimates of the exponentially damped sinusoidal signal parameters, the damping factor and the frequency. By using additional integral ...

The seasonal cycle of mid to high latitude surface air temperature is prime example of a climate response to external forcing. Here we examine what controls the amplitude and phase of this cycle. By comparing the seasonal cycle in an numerical model of the atmosphere and ocean mixed layer where the large seasonal variation in humidity is allowed to affect longwave radiation to one where it is n...

A quantum kinetic equation is derived for the description of pair production in a timedependent homogeneous electric field E(t). As a source term, the Schwinger mechanism for particle creation is incorporated. Possible particle production due to collisions and collisional damping are neglected. The main result is a kinetic equation of non-Markovian character. In the low density approximation, t...

This paper presents the application of a power flow parameter to improve system identification results when used along with conventional acceleration matching techniques. In this paper the power balance concept is implemented in a substructure to estimate the stiffness and damping coefficients from time domain responses. Power flows are calculated using the time averaged product of force and ve...

iii Abstract The goal of this research is to provide a framework for vibro-acoustical analysis and design of a multiple-layer constrained damping structure. The existing research on damping and viscoelastic damping mechanism is limited to the following four mainstream approaches: modeling techniques of damping treatments/materials; control through the electrical-mechanical effect using the piez...

A technique to identifY damping parameters directly from the frequency response functions (FRF) in matrix forms has been developed. Furtl1ermore, the technique identifies the viscous damping and structural damping coefficients separately. The technique provides more accurate damping values because it does not rely on the information of the natural modes as in the conventional method. The dampin...

In this paper, a direct discrete time design method in the sense of passivity-based control (PBC) is investigated. This method, which is known as interconnection and damping (IDA), deals with the stabilization of under-actuated mechanical systems and, it is based on the modification of both the potential and kinetic energies. In order to give a direct discrete time IDA-PBC design method, the di...

As vividly illustrated by the quintessential Watt’s governor a natural procedure to modify the behavior of a dynamical system is to interconnect it with another dynamical system. Examples of this approach abound in modern high–performance practical applications and are proven to be very robust and reliable. These include, among many others, mechanical suspension and flapper systems, flotation d...

 In the present paper damped vibrations of non-homogeneous infinite rectangular plate of parabolically varying thickness resting on elastic foundation has been studied. Following Lévy approach, the equation of motion of plate of varying thickness in one direction is solved by quintic spline method. The effect of damping, elastic foundation and taperness is discussed with permissible range of pa...

language is a system and every system has rules that govern the structure of its vocabulary. the rules of the arabic language are based on the vowels that consistent with the meanings used in the context represent the words' position. there are some basic rules in addition to vowels which are mostly seen in the written texts. one of these rules is the matching rule that refers to the condi...