• Refine Query
  • Source
  • Publication year
  • to
  • Language
  • 85
  • 80
  • 13
  • 10
  • 4
  • 3
  • 2
  • 2
  • 2
  • 1
  • 1
  • 1
  • Tagged with
  • 273
  • 273
  • 98
  • 70
  • 60
  • 54
  • 51
  • 45
  • 43
  • 39
  • 36
  • 32
  • 31
  • 30
  • 29
  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Active isolation of vibration

McKinnell, Robert James January 1989 (has links)
No description available.
2

Devices for the reduction of pipeline vibration

Clark, Peter January 1995 (has links)
No description available.
3

Vibrational power transmission through beam-like structures

Horner, Jane Louise January 1990 (has links)
No description available.
4

Model Reduction of Large Structural Systems for Active Vibration Control

Boffa, John January 2006 (has links)
This thesis studies the applicability of the Dynamic model reduction method that is used for direct plant order reduction in the active vibration control of large and flexible structures. A comparison of the performances between the reduced models produced by the Dynamic model reduction method and those obtained by other common model reduction methods such as the Guyan method, and the Mode-displacement method have been carried out. By using a full analytical model of a twenty storey building as the reference, each three degrees of freedom model was compared by computer simulation. The open-loop frequency response simulation, open-loop earthquake simulation, and the closed-loop earthquake simulation were all used to initially evaluate the reduced models. The accuracy of the frequency responses was assessed with sinusoidal applied forces, and for the closed-loop dynamic analysis, an active mass damper at the top storey and a recorded earthquake excitation was used. When compared with the simulation results of the Guyan method, the Dynamic method has many advantages, especially in terms of its accuracy at the high frequency range. The Mode-displacement method produces reduced models that are good for dynamic analysis of open-loop systems, but it was found to be inconvenient for use in active control. Finally, the Dynamic model reduction method and Guyan method were compared using experimental test results. A 2.5m tall building model with 20 floors was used as the plant, with a linear motor installed at the top storey for the purposes of active-damping. Although the results of simulations would suggest that both models perform sufficiently, experimental testing proved that only the Dynamic model performs adequately for this specific application of active control. The problem associated with most model reduction methods, such as the Guyan, is that they are based on full-order models that were derived from the linear elastic theory. The versatility of the Dynamic model reduction method is such that it provides the option of obtaining system parameters directly from experiment, not just from theory. The experimental procedure ensures that the Dynamic model reduction method forms an accurate description of the real system dynamics. The applicability of this method for obtaining low-order plant models was demonstrated through real-time active control testing of the model structure, while it was subject to a sinusoidal excitation. The tests have shown that the Dynamic model reduction method can be used as an alternative approach for the model reduction of structural systems for the purpose of active vibration control.
5

An exploration of parametric excitation as a tool for vibration control

Nguyen, Phillip Huu 08 1900 (has links)
No description available.
6

The development of a simple magnetic bearing for vibration control

Lim, T. M. January 1987 (has links)
No description available.
7

Model Reduction of Large Structural Systems for Active Vibration Control

Boffa, John January 2006 (has links)
This thesis studies the applicability of the Dynamic model reduction method that is used for direct plant order reduction in the active vibration control of large and flexible structures. A comparison of the performances between the reduced models produced by the Dynamic model reduction method and those obtained by other common model reduction methods such as the Guyan method, and the Mode-displacement method have been carried out. By using a full analytical model of a twenty storey building as the reference, each three degrees of freedom model was compared by computer simulation. The open-loop frequency response simulation, open-loop earthquake simulation, and the closed-loop earthquake simulation were all used to initially evaluate the reduced models. The accuracy of the frequency responses was assessed with sinusoidal applied forces, and for the closed-loop dynamic analysis, an active mass damper at the top storey and a recorded earthquake excitation was used. When compared with the simulation results of the Guyan method, the Dynamic method has many advantages, especially in terms of its accuracy at the high frequency range. The Mode-displacement method produces reduced models that are good for dynamic analysis of open-loop systems, but it was found to be inconvenient for use in active control. Finally, the Dynamic model reduction method and Guyan method were compared using experimental test results. A 2.5m tall building model with 20 floors was used as the plant, with a linear motor installed at the top storey for the purposes of active-damping. Although the results of simulations would suggest that both models perform sufficiently, experimental testing proved that only the Dynamic model performs adequately for this specific application of active control. The problem associated with most model reduction methods, such as the Guyan, is that they are based on full-order models that were derived from the linear elastic theory. The versatility of the Dynamic model reduction method is such that it provides the option of obtaining system parameters directly from experiment, not just from theory. The experimental procedure ensures that the Dynamic model reduction method forms an accurate description of the real system dynamics. The applicability of this method for obtaining low-order plant models was demonstrated through real-time active control testing of the model structure, while it was subject to a sinusoidal excitation. The tests have shown that the Dynamic model reduction method can be used as an alternative approach for the model reduction of structural systems for the purpose of active vibration control.
8

Virtual sensors for active noise control /

Munn, Jacqueline Marie. January 2003 (has links) (PDF)
Thesis (Ph.D.) -- University of Adelaide, School of Mechanical Engineering, 2004. / Bibliography: p.229-238.
9

TORSIONAL VIBRATION ANALYSIS AND ALGORITHM-BASED CONTROL FOR DRIVELINE RELIABILITY IN TRUCKS

Evan Paul Parshall (16648758) 26 July 2023 (has links)
<p>Torsional vibrations, resulting from the interaction between the engine, transmission, and other components, can lead to reduced driveline performance, increased fatigue, and compromised vehicle reliability. Thus, understanding and effectively managing these vibrations are crucial for ensuring optimal truck operation and safety. This thesis investigates the phenomenon of torsional vibrations in trucks and proposes an algorithm-based approach for detecting natural frequencies and controlling vibrations along the driveline. </p>
10

The dynamics and vibration control of a flexible arm

Al-Annaz, Sa'ad Shakir January 1992 (has links)
No description available.

Page generated in 0.1181 seconds