Global ETD Search

1	Research on Robust Control of Micromachined Accelerometers Wu, Wei-ming 22 August 2000 (has links) This paper presents the research on the robust control of micromachined accelerometers. First, we present different micromaching techniques and compare, analyze the accelerometers with different methods of signal pick-off. Besides the different methods of signal pick-off(the position detection of the seismic mass) and structure designs, we can enhance the performance such as stability, bandwidth, sensitivity, resolution and dynamic range etc. by suitable feedback controllers. So inside the front part of the paper are the analyses for the controllers of different types of accelerometers so far. Moreover, we design the controllers by robust control in different methods with the model of one specific type of micromachined tunneling accelerometer. Because of the robust controllers, the accelerometers can be stable and have good performance under different environments and uncertainties. At last we analyze and compare the controllers designed by -synthesis and gap metric. mu synthesis accelerometer robust control gap metric
2	An H-infinite Based Sensitivity Function Shaping Method Huang, Yan-Chuen 24 July 2002 (has links) Abstract This thesis presents that the closed-loop sensitivity function shaping combined with -synthesis applies to design the controller with structured uncertainties. The sensitivity function shaping is directly based on the indices of the closed-loop performances. The closed-loop frequency response and the robust stability for the system could approach the designed performances by adjusting weighting functions. Since the robust performance of the closed-loop systems bases on the index of the open-loop function in the loop shaping, it may not accomplish the requirement of the designer. The loop shaping can¡¦t be applied to design controllers for the system with structured uncertainties. Therefore, using the closed-loop sensitivity function shaping to design controller will contain the system with structured uncertainties and satisfy the closed-loop performance. Mu-synthesis Loop Shaping Sensitivity Function Shaping
3	Development of Chatter Attenuation Robust Control for an AMB Machining Spindle Pesch, Alexander Hans January 2013 (has links) No description available. Mechanical Engineering Engineering Machining Chatter Active Magnetic Bearing Robust Control mu-synthesis AMB
4	Missile autopilot design using Mu-Synthesis Bibel, John Eugene 25 August 2008 (has links) Due to increasingly difficult threats, current air defense missile systems are pushed to the limits of their performance capabilities. In order to defend against these more stressing threats, interceptor missiles require greater maneuverability, faster response time, and increased robustness to more severe environmental conditions. One of the most critical missile system elements is the flight control system, since its time constant is typically half of the total missile system time constant. Conventional autopilot design techniques have worked well in the past, but in order to satisfy future and more stringent design specifications, new design methods are necessary. Robust control techniques (in particular, H-Infinity Control and Mu-Synthesis) and their application to the design of missile autopilots are addressed in this thesis. In addition, conventional autopilot designs are performed as comparative benchmarks. This paper reviews the missile autopilot design problem and presents descriptions of the classical and H-Infinity/Mu design methods. Missile autopilot designs considering both rigid-body dynamics and elastic-body dynamics are presented. Comparisons of the design approaches and results are also discussed. The results show that the application of robust control techniques to the design of missile autopilots can improve the performance and stability robustness characteristics of the flight control system. / Master of Science missile autopilot structured singular value H-Infinity control Mu-Synthesis LD5655.V855 1998.B534
5	Model Identification, Updating, and Validation of an Active Magnetic Bearing High-Speed Machining Spindle for Precision Machining Operation Wroblewski, Adam C. 13 October 2011 (has links) No description available. Electromagnetism Engineering Industrial Engineering Mechanical Engineering rotordynamics modeling spindle high speed active magnetic bearing AMB machining high speed machining system identification open loop model model updating optimization robust control mu-synthesis mu-control

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