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Showing 1 to 20 of 31 for “"Active Vibration Control"”.
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Active vibration control of composite structures
The vibration control of composite beams and plates subjected to a travelling load is studied in this dissertation. By comparing the controlled as well as uncontrolled responses of classical and refined structural models, the influence of several important composite structure properties which are …
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Active vibration control of civil engineering structures
This thesis is in the area of active vibration control of Civil Engineering structures subject to earthquake loading. Existing structural control methods and technologies including passive, active, semi-active and hybrid control are first introduced. An extensive analysis of a frame-pendulum model …
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Distributed parameter active vibration control of smart structures
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1988.
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Optimal actuation in active vibration control using pole-placement
… of optimal actuation in a mechanical system to control its vibration response. The overall aim is to develop an active vibration control method with a minimum control effort, allowing the smallest actuators and lowest control input. Mechanical systems were approximated by discrete masses …
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Study of Active Vibration Control using the Method of Receptances
… rod. Using the sensor data, closed loop feedback control gains can be calculated by solving a simple set of linear equations. The feedback gains can be applied to generate the required control force using an actuator. This partial pole assignment can be done without continuous or discrete …
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Vibration Attenuation of Composite Moving Beams using Active Vibration Control Techniques
… studies have shown that the amplitude of lateral vibration of moving beams is 40 percent higher than that of non moving beams. In this research a numerical model based on the finite element method is done to reduce the excess vibrations caused by the axial oscillation of the beam. A computer code …
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Wideband Active Vibration Control Synthesis and Implementation on Uncertain Resonant Structures
… they also incur significant challenges to control vibration. The construction that makes them strong, light, and ``rigid'' also makes them have very small inherent structural damping, and highly-complex modal structure. A myriad of control techniques have been developed to work on this …
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A dual reaction-mass dynamic vibration absorber for active vibration control
Traditional dynamic vibration absorbers (DVAs) consist of a mass-spring-damper system and are an effective means of attenuating structural vibration over a narrow frequency band. The effective bandwidth of the DVA can be increased by the addition of an externally controlled force, generally applied …
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Sensitivity of active vibration control to structural changes and model reduction
… is concerned with by two types of sensitivity of active vibration control of large space structures (LSS). The first one required for assessing robustness, is the sensitivity of the performance and stability of the control system to changes in structure and to model reduction. The second type is …
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Spatial compensator design for the active vibration control of interconnected flexible structures
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1994.
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Active vibration control for a free piston stirling engine with linear alternator FPSE/LA
… engine suffers from continuous self-induced vibrations caused by the reciprocating motion of a permanent magnet attached to its piston inside a linear alternator. Currently, the damping of the vibrations in the FPSA/LA is achieved by employing a passive tuned mass damper (TMD) tuned to damp …
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A study of active control techniques for noise reduction in an aircraft fuselage model
… used to investigate the elementary mechanisms of control of sound transmission into aircraft cabins by two active control techniques: propeller synchrophasing and active vibration control. Propeller synchrophasing involves controlling the relative rotational phase of the engines to achieve maximum …
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A planar comparison of actuators for vibration control of flexible structures
… These distributed parameter systems exhibit vibration characteristics such as low, closely spaced natural frequencies and light damping, which, when coupled with the stringent pointing accuracy and vibration control requirements imposed on these systems, bring about interesting control …
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A study of modal-space control of a beam-cable structure: experiment and theory
… were to implement theoretically a method of active vibration control, known as modal-space control, on a relatively simple beam-cable structure. The control was implemented in analog form and provided modal viscous damping in each of the three modes of the structure. Transient response to …
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Modeling and robust adaptive control of metal cutting via application of piezoactuator
Self-excited vibration, so called chatter, is known to cause detrimental effects on the machined surface finish and to decrease the machining efficiency. Because of the small amplitude, high frequency properties of chatter, it requires active vibration control providing a force to the cutting …
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Dynamic response of simply supported beams excited by piezoelectric actuators
… use of piezoelectric devices for the purposes of active noise or vibration control has become attractive in recent times. These small, power to weight efficient devices have had some success in active vibration control; however, the force transfer mechanism by which they interact with the …
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A plane grillage model for structural dynamics experiments: design, theoretical analysis, and experimental testing
… realistic and challenging experimental test for active vibration control concepts applicable to large space structures, an experimental model is required that simulates the complicated dynamic characteristics of such structures. This study presents the design, theoretical analysis, and …
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Active control of a coupled plate-cylinder system
… cylindrical shell via a fixed number of active-passive mounts. A harmonic point-force disturbance is applied to the plate. Various active control approaches are applied to minimize the acoustic pressure radiated by the coupled system. The Active Structural Acoustic Control (ASAC) …
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An experimental investigation into active damage control systems using positive position feedback for AVC
… the use of Positive Position Feedback (PPF) for Active Vibration Control as part of an Active Damage Control System (ADCS). Vibration control increases the fatigue life of a structure and decreases the in-plane stresses that can cause delamination in a composite. PPF is a collocated direct-output …
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