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.
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Showing 1 to 20 of 136 for “"Vibration control"”.
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Granular sloshing absorbers for vibration control
Tall, flexible structures may be exposed to excessive oscillations when subjected to wind, earthquakes or other shocks. Passive and active absorbers are employed, often at great expense, to stabilise the structures for the safety and comfort of the occupants. Current passive damper technologies …
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Vibration control of flexible robot manipulators
… into the versatility and effectiveness of a vibration control technique for flexible robot manipulators. A two link flexible robotic arm is considered and the dynamic model of the system is derived using the finite element method.
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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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Adaptive Predictive Feedback Techniques for Vibration Control
… this dissertation, adaptive predictive feedback control is used to suppress plate vibrations. The adaptive predictive controller consists of an on-line identification technique coupled with a control scheme. Various system identification techniques are investigated and implemented including batch …
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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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Position and vibration control of flexible space robots
… dissertation is concerned with the position and vibration control of flexible articulated space robots consisting of a rigid platform, two flexible arms, and a rigid end-effector carrying a payload, all components being serially connected through revolute joints. The mission is to carry a payload …
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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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Simultaneous Energy Harvesting and Vibration Control via Piezoelectric Materials
… and design of simultaneous energy harvesting and vibration control on the same host structure. The motivating application is a multifunctional composite sandwich wing spar for a small Unmanned Aerial Vehicle (UAV) with the goal of providing self-contained gust alleviation. The basic idea is that …
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Frequency domain iterative tuning for active noise and vibration control
In this thesis a new adaptive control method, called Iterative Tuning in the Frequency Domain (FD-IT), is proposed for Active Noise and Vibration Control (ANVC). This approach is a gradient based self-tuning method which completely relies on analysis of the frequency response of system dynamics and …
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Active Nonlinear Vibration Control of Engineering Structures of Multiple Dimensions
An active nonlinear mechanical vibration control strategy is developed in the research of the author’s PhD program for the nonlinear vibration control of engineering structures of multiple dimensions. The proposed control strategy has been applied in several wildly applied typical engineering …
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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 Control for Chatter Suppression with Application to Boring Bars
… sensors, and analog circuits is demonstrated to control the self-excited oscillations known as chatter that occur when single-point turning a rigid workpiece with a flexible tool. The nature of this manufacturing process, its complex geometry, harsh operating environment, and poorly understood …
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Novel Lightweight Noise and Vibration Control Treatments for Marine Structures
… the development and testing of distributed vibration absorber designs with specific application to heavy plates for the reduction of vibration and sound radiation. Two particular designs, already under investigation for use on thin panels or composite materials, were adapted to passively …
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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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Study on Bandgap Manipulation and Structural Vibration Control in Sandwich Metastructures
… exposed to problematic medium- and low-frequency vibrations induced by operational loads, environmental disturbances, and earthquakes. Although conventional vibration isolation and mitigation methods have been widely used, they still face limitations in broadband control of medium- and …
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Vibration control using an adaptive tuned magneto-rheological fluid vibration absorber
An adaptive tuned vibration absorber (ATVA) can be used to suppress unwanted vibrations. If the excitation frequency is time harmonic but the frequency changes with time,it is desirable to retune the ATVA so that the natural frequency of the ATVA always coincides with the excitation frequency. One …
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Dynamic modeling and vibration control of high-voltage overhead transmission lines
… it allows an optimal design and positioning of vibration dampers for the cables. Excessive sway and oscillation of power lines need to be avoided, as they can lead to damage of the lines and power interruptions. The relatively high flexibility of the cables, coupled with the large spans and …
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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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