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 20 of 69 for “"passive control"”.
-
The Effect of Active and Passive Control on Air Traffic Controller Dynamic Memory
… was to investigate the effect of automated and passive control on air traffic controller dynamic memory. The study consisted of two experiments, each involving a realistic ATC scenario for radar approach control with a mix of arriving and departing traffic. In Experiment I, the subjects …
-
Acoustic Devices for the Active & Passive Control of Sound in a Payload Compartment
… resonators and loudspeakers used for noise control in rocket payload compartments are developed. Second, active control using a hybrid control system (with structural and acoustic actuators) was tested experimentally. Due to the weight limitations for this application, Helmholtz resonators …
-
Simultaneous active passive/control of extensional and flexural power flows in infinite thin beams
Passive control techniques to minimize structural vibrations are limited with respect to the amount of attenuation obtained especially in the low-frequency region but do not require adding any power. Active control methods are effective for reducing structural vibrations, especially at low …
-
Active/Passive control of fluid-borne and structure-borne disturbances in fluid-filled piping systems
… fluid and shell walls. It is necessary to devise control approaches that tackle both components of the excitation simultaneously. This study will demonstrate new approaches in active and passive control techniques and show their advantages over classical control approaches. It is necessary to …
-
Development, Analysis and Testing of a Hybrid Passive Control Device for Seismic Protection of Framed Structures
… seismic protection strategy called the hybrid passive control device (HPCD) has been developed which combines typical passive energy dissipation devices. It consists of a high damping rubber (HDR) sandwich damper in series with a buckling restrained brace (BRB). The HPCD provides energy …
-
Active, Passive and Active/Passive Control Techniques For Reduction of Vibrational Power Flow in Fluid Filled Pipes
… flow in fluid filled piping systems makes its control and subsequent reduction a difficult problem. This work experimentally explores the potential of different active, passive and active/passive control methodologies for control of vibrational power flow in fluid filled pipes. Circumferential …
-
Hybrid adaptive feedforward control of structures to seismic inputs
… of the structural responses using the hybrid control system were observed for most of the real accelerograms. It was also observed that the hybrid control system always improved the performance of the passive control system. 3. Peak. structural responses during sensor failures were observed to …
-
Experimental Sensitivity Analysis and Control of Thermoacoustic Systems in the Linear Regime
… to be a valuable tool for developing optimal passive control solutions. This thesis aims to develop novel experimental sensitivity analysis techniques and provide a first comparison with the predictions of adjoint-based sensitivity analysis. In this thesis experimental sensitivity analysis is …
-
The influence of structural-acoustic coupling on the dynamic behaviour of a one-dimensional vibro-acoustic system
… behaviour of a vibro-acoustic system under passive/active control. The simplest model of a vibro-acoustic system one can consider is a one-dimensional acoustic cavity driven by a single-degree-of-freedom (SDOF) structure. This simple model is used to demonstrate the physical characteristics …
-
Control of Radiated Noise from Fluid-Loaded Stiffened Structures
… intensity (NNI) technique. Additionally, a passive control technique based on the acoustic black holes (ABHs) is developed to control vibroacoustic responses of fluid-loaded stiffened plates. This has been achieved by incorporating ABHs into stiffeners and by analysing their effects on the …
-
Improved continuous-time higher harmonic control using H [infinity] methods
… and also increases its operational cost. Passive control techniques have been applied to helicopter vibration suppression, but these methods are generally heavy and are not robust to changes in operating conditions. Feedback control offers the advantages of robustness and potentially …
-
Motion control of long span horizontal structures
… damping. These three properties traditionally controlled motion-related serviceability issues, but this is no longer the case. Engineers are increasingly reporting vibration problems in horizontal structures. Hence, the dominant design criterion has shifted from a basis of strength to one of …
-
Innovative System for Seismic Control Strategies
… of the first scheme and to resolve other passive control related design issues, which is namely DSFD. The main purpose of this paper is to propose a new method for more effective damping control system and develop of further study.</p>
-
Disturbance Attenuation in Mass Chains with Passive Interconnection
… a large number of elements. The main focus is on passive control of a chain of interconnected masses where a single point is subject to an external disturbance. The problem arises in the design of multi-storey buildings subjected to earthquake disturbances, but applies in other situations such as …
-
Passive electromagnetic damping device for motion control of building structures
… in this thesis develops a new device for the passive control of motion in building structures: an electromagnetic damper. The electromagnetic damper is a self-excited device that provides a reaction force to an applied motion. We chose a tubular permanent-magnet linear machine as this new …
-
Experimental and Computational Analysis of a 3D Printed Wing Structure
… the design in order to prevent flutter (passive control) or eliminate it by applying input on control surfaces (active control). High-fidelity models such as coupled Computational Fluid Dynamics (CFD) - Computational Structural Dynamics (CSD) can obtain full structural and aerodynamic …
-
Driver injury severity at u.s. highway-rail crossings
… driver injury severity model with respect to control devices, and driver injury severity model with respect to age and gender. Based on the model study, it is found that older drivers are more susceptible than younger drivers to cause an increase in severity, an increase in severity under bad …
Page 1 of 4