Dissertation > Excellent graduate degree dissertation topics show

Dynamic Characteristics Research of Rotating Flexible Blade

Author: LiuXiangLong
Tutor: WangBenLi
School: Harbin Institute of Technology
Course: Aircraft design
Keywords: Dynamic stiffening First approximation coupling Motion Stability Optimal Tracking Control
CLC: O313.7
Type: Master's thesis
Year: 2007
Downloads: 166
Quote: 1
Read: Download Dissertation

Abstract


In this paper, the flexible hub - blade system is a rigid-flexible coupling flexible multi-body system, it has changed, highly coupled, highly non-linear characteristics. It has been widely applied in the field of aerospace, high-speed vehicles, operated robotic arm, robotics, complex institutions. First, for the hub - flexible blade composed of rigid-flexible coupling system, considered in the axial deformation due to lateral deformation caused by axial shortening the application of Hamilton's principle for dynamic stiffening rigid-flexible coupling dynamic learning equations. After using the assumed mode method to discrete deformation of the flexible blades, are taken into account second order coupling term discrete time approximation coupled dynamical equations. If you do not consider the second-order coupling term, is the traditional zero approximation coupling model. In the first approximation coupling model, if ignored longitudinal deformation, to get an approximate simplified model. In the numerical simulation analysis, consider two cases: the rigid-flexible coupling dynamics problems in the large-scale movement known non-inertial field and a wide range of motion unknown. Simulation results show that the first approximation coupling model can get stable results in a variety of speeds, and the zero-order approximation coupling model in the high-speed large-scale movement will diverge. By comparison to the first approximation model and an approximate simplified model simulation results show that the first approximation simplified model can replace the first approximation model for the study of the dynamics and control. Secondly, the application of Lyapunov direct method, rigid-flexible coupling dynamic motion control equation stability analysis. Lyapunov direct method to study the stability of linear and nonlinear equations, is a universal stability analysis. In this paper, the energy - momentum moment method to construct the Lyapunov function, traditional zero approximation coupling model and the first approximation coupling model, stability analysis, and came to the range between zero model and a model application, the results show that when the rotational angular velocity is greater than the blade baseband, the zero-order approximation model will fail; an approximate model in any angular velocity stability. Finally, the first approximation to simplify the model of linear, the center rigid - flexible blade model is linear kinetic equation. Using the optimal tracking control theory, the linear model control law designed to control the non-linear approximation to simplify the model. Because the design of the controller is a function of the blade modal coordinates, extracted from the physical measurement of modal coordinates are given. The study given trajectory tracking simulation of a given position in both cases results show that a wide range of motion to reach the target, and the effective suppression of vibration.

Related Dissertations

  1. Study on Temperature Field Model and Optimal Tracking Control for Plate in Controlled-Cooling Process,TG335
  2. Optimum Design of NC Tumble Winding Machine and Development of Its Simulation Software,TG659
  3. Structural Design and Stability Analysis on Vertical Underwater Card Claw Connector,TE952
  4. Rotational Speed Control Researching for PMSG-based Wind Energy Conversion System,TM614
  5. Under the influence of the spatial uncertainty Flexible Manipulator Dynamics Modeling and Simulation,TP242
  6. Study of Schemeand Structural Kinematics and Stability of Motion of In-pipe Surface Treated Robot,TP242
  7. Study on Dynamic Characteristics and Stability of Seals and Rotor System,TH136
  8. For a wide range of flexible sheet of flexible coupling dynamics theory and numerical analysis,O342
  9. Research into Optimal Tracking Control for Nonlinear Time-delay Large-scale Systems with Persistent Disturbances,TP273.1
  10. A Cooperative MAS Approach to Conflict Resolution,V328
  11. Positive emotional impact on the stability of competitive gymnast action,G832
  12. Researches on Rigid-Flexible Coupling Dynamics of the Flexible Multibody Satellite,V412
  13. Combinatory Optimization of the Vehicle Handling and Stability,U461.6
  14. Viscoelastic drive with transverse nonlinear vibration study,O345
  15. Flexible coupling dynamics of multi-body system and its launch system,O313
  16. Numerical analysis of dynamic stiffening of flexible multibody systems,O313.7
  17. The Poincaré differential equations qualitative Theoretical Research,O175
  18. A rigid-flexible coupling the multibody system dynamics modeling and simulation,O316
  19. Joint Optimization and Simulation Research of 4WS Vehicle Handling and Stability,U461.6
  20. Flexible coupling dynamics of the missile and artillery launch system,TJ303

CLC: > Mathematical sciences and chemical > Mechanics > Theoretical Mechanics ( general mechanics ) > Dynamics > Multibody system dynamics
© 2012 www.DissertationTopic.Net  Mobile