Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 11 of 11 for “"Beam vibration"”.
-
Using Macro-Fiber Composite Actuators for Aquatic Locomotion
… system is built upon a composite cantilever beam with MFC actuators in bimorph configuration. The MFC actuators excite the composite beam near its fundamental natural frequency to produce thrust as the vibration transfers momentum to the surrounding fluid. An analytical model that …
-
Vibrational Control of a Cantilever Beam Using Sensor and Actuator Averaging Methods
In this paper, governing equations for cantilever beams are derived. We go over sensor and actuator averaging, a method to create a spatial filter that is insensitive to model parameter uncertainty. We develop a controller to actively control cantilever beam vibration using accelerometer input. The …
-
Random Vibration Analysis of Higher-Order Nonlinear Beams and Composite Plates with Applications of ARMA Models
In this work, the random vibration of higher-order nonlinear beams and composite plates subjected to stochastic loading is studied. The fourth-order nonlinear beam equation is examined to study the effect of rotary inertia and shear deformation on the root mean square values of displacement …
-
Vibration analysis of a beam structure attached with two dynamic vibration absorbers
A fixed end beam is a structural element supported at both sides which carries load primarily in flexure that may experience vibration as it does carry vertical loads and gravitational forces. Its exposure to vibration can lead to excessive deflections and failure of to the structure. The aim of …
-
Force and strain feedback for distributed actuation
… mixing coefficient is derived. Mass-spring and beam models are used to further explore the behavior of the zeroes of the mixed transfer function. Both an approximate beam model derived using assumed mode method and the exact solution of the beam vibration equation are employed. A practical …
-
Reliability of Tibial Measurement with Mechanical Response Tissue Analysis
… frequency (70-500Hz) stimulation according to beam vibration theory. MRTA has demonstrated the ability to reliably estimate human ulnar bending stiffness with between-test coefficients of variation of 5%, and in vivo measurements of monkey tibiae have been validated with ex vivo 3-point …
-
Optimum Actuator Grouping in Feedforward Active Control Applications
… acoustic control (ASAC) of a simply-supported beam excited with a broadband disturbance. Three PZT actuators are mounted on the beam structure to control the wavenumber components corresponding to five radiation angles. The propagation angles are selected to represent the total radiated sound …
-
Δυναμική και ευστάθεια δομικών στοιχείων που φέρουν αναπνέουσα ρωγμή
Στις μέρες μας, η απαίτηση για εξοικονόμηση υλικού και, κατ’ επέκταση, κόστους έχει οδηγήσει στο σχεδιασμό ελαφρών και λεπτών κατασκευών, όπως οι μεταλλικές δομές αεροσκαφών και οι μεταλλικές γέφυρες μεγάλων ανοιγμάτων. Παράλληλα όμως, η εξοικονόμηση υλικού έχει αυξήσει την πιθανότητα απώλειας της …
-
Vibration and Flexural Strength Characteristics of Composite Castellated Beams
… concrete and design optimizations, floor vibration problems are becoming a serious serviceability problem. The castellated beam is a prime example and was the focus of this study. The vibration and flexural strength performance were verified in this paper. The vibration characteristics of …
-
Control of Dynamic Response of Thin-Walled Composite Beams Using Structural Tailoring and Piezoelectric Actuation
… to control the dynamic response of cantilever beams subjected to external excitations is addressed. The cantilevered structure is modeled as a thin-walled beam of arbitrary cross-section and incorporates a number of non-classical effects such as transverse shear, warping restraint, anisotropy …
-
Vibration of a nonlinear shear deformable beam by numerical simulation
The vibration of a uniform geometrically nonlinear shear deformable beam subjected to a transverse harmonic excitation is investigated by the method of numerical simulation. Rotatory and axial inertia are included in the model. The beam is simply supported with supports a fixed distance apart. The …