Dissertation > Excellent graduate degree dissertation topics show

Research on the 6-Dof Fault Tolerant Control of the Vibration Isolation Platform with Eight Actuators

Author: XuDaYe
Tutor: ZhengGangTie
School: Harbin Institute of Technology
Course: General and Fundamental Mechanics
Keywords: active vibration control octo-strut platform decoupling control actuator fault diagnosis
CLC: TB535.1
Type: Master's thesis
Year: 2008
Downloads: 86
Quote: 0
Read: Download Dissertation


Launching stage is the most severe dynamic environment that satellites will ever experience during their whole missions. Whole Satellite Vibration Isolation technique, proven to be the trend, is to install an isolator between the rocket and the satellite to attenuate the vibration load transmitting to the satellite, for the purpose of enhancing satellites’reliability and reducing the structural weight of the satellites. Integrated active-passive vibration isolation adopts advantages from both active and passive vibration isolation, which is realized by adding active control elements in parallel with the passive ones. The active part can suppress the resonant peaks and improve the isolation ability as well as stiffness in the low frequency range. On the other hand, in the higher frequency range, passive vibration isolation is still employed. In this way, the capacity of isolating vibrations in the whole frequency range is achieved and the energy consumption remains reasonable.The structure of eight parallel actuators is able to realize six-degree-of-freedom vibration isolation, which also guarantees high reliability. Compared with typical Stewart platforms with only six actuators, the symmetrical arrangement insignificantly increases the complexity of the platform dynamics. Each actuator is capable of providing passive and active vibration isolation by integrating pneumatic cylinder, spring and damper in parallel and is connected to the mobile platform and the base through spherical joints.This thesis investigates the active control system of the pneumatic octo-strut vibration isolation platform. Coupling among the input-output channels of the platform is complicated which makes it hard to implement control algorithm. Thus, the thesis focuses on the decoupling techniques of the‘healthy’system and the system with actuator failures.Based upon the complete dynamic model of the platform, some insignificant factors are ignored to obtain a simplified model suitable for control system design. Then through input-output transformations, the decoupling among feedback channels of the platform is achieved and single-input-single-output control algorithm for each channel can be designed individually. Moreover, the application of fault diagnosis based on state observer to the platform is also analyzed; combined with above mentioned control algorithm, the platform is able to provide six-degree-of-freedom vibration isolation in presence of one-or-two actuator failure. Finally, the transmissibility of the‘healthy’system and the system with actuator failures is measured experimentally and the result shows the validity of the vibration control algorithm.

Related Dissertations

  1. Complex process control system design and control strategy,TP273
  2. Hot and cold water mixing system decoupling control research and implementation,TP273
  3. Neural Network PI Pepetitive Controller for Active Power Filter,TN713.8
  4. Seeking control based audio signal ball mill,TD453
  5. The Study of Decoupling Control in Variable-Air-Volume Conditioning System,TM925.12
  6. Research on Trajectory Tracking Control for Free-Floating Flexible Space Robot,TP242.3
  7. Supersonic slab structure aeroelastic flutter analysis and control,V215.34
  8. Research on Local Resonance and Active Control for Flexible Antenna of Spacecraft,V443.4
  9. Giant forging hydraulic machine active synchronization control system research,TG315.4
  10. Control structure based aircraft engine optimization Multivariable Robust Control,V233.7
  11. Active Control of micro-vibration structure,TB535.1
  12. Fuzzy Logic Compensation Inverse System Decoupling Control for Bearingless Switched Reluctance Motor,TM352
  13. Study on Decoupling Control of Bearingless Induction Motor Based on Inverse System Method,TM343
  14. Intelligent algorithm unit coordinated control system applied research,TP273
  15. Based on the three-dimensional dynamic platform motion decoupling control system design and research,TP273
  16. Research of Intelligent Control for Thermal Process of Circulating Fluidized Bed Boiler,TK229.66
  17. Direct-drive permanent magnet synchronous wind turbine Modeling and Control System Simulation,TP273
  18. Research on Data Acquisition and Algorithm of City Heating Supply System,TP274.2
  19. Study on a Barrel Type Vibration Isolation Device Based Damping Second Order System Convergent Control Algorithm,TB535.1
  20. Dynamic Analysis and Vibration Control of a Flexible Four Linkage Mechanism,TH112

CLC: > Industrial Technology > General industrial technology > Acoustic engineering > Vibration, noise and its control > Vibration and noise control and its use > Vibration isolation, damping materials and structures
© 2012 www.DissertationTopic.Net  Mobile