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 16 of 16 for “"closed-loop bandwidth"”.
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Low phase noise, high bandwidth frequency synthesis techniques
… frequency synthesizers to achieve high closed loop bandwidth and low output phase noise simultaneously. Quantization induced phase noise is the bottleneck in state-of-the-art synthesizer design, and results in a noise-bandwidth tradeoff that typically limits closed loop synthesizer …
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Design of a small fast steering mirror for airborne and aerospace applications
… angular acceleration, 10 mrad range, and 9 kHz closed-loop bandwidth.
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High bandwidth rotary fast tool servos and a hybrid rotary/linear electromagnetic actuator
This thesis describes the development of two high bandwidth short-stroke rotary fast tool servos and the hybrid rotary/linear electromagnetic actuator developed for one of them. Design insights, trade-off methodologies, and analytical tools are developed for precision mechanical systems, power and …
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Highly parallelized control programming methodologies using multicore CPU and FPGA for highly dynamic multi-DoF mobile robots, applied to the MIT Cheetah
… of data processing from a large number of high-bandwidth actuators and sensors. To solve this important problem in robotics, I developed parallelized control programming methodologies that effectively utilize the advantages of modern parallel real-time computing technologies: multicore CPU, the …
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A 2 degree-of-freedom SOI-MEMS translation stage with closed loop positioning
… analysis, fabrication, and characterization of a closed loop XY micro positioning stage. The XY micro positioning stage is developed by adapting parallel-kinematic mechanisms, which have been widely used for macro and meso scale positioning systems, to silicon-based micropositioner. Two orthogonal …
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A metrological atomic force microscope
… A PC-based digital control system provides closed-loop control of the lateral scanning and axial height regulation actions of the probe assembly. The lateral scanning system, which dictates the probe's motion in directions parallel to the sample plane, has measured -3 dB closed-loop …
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Resonant Cross-Commutated Dc-Dc Regulators with Omni-Coupled Inductors
… switching frequency, output capacitance, and closed-loop bandwidth.
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X-ray microscope performance enhancement through control architecture change
… algorithms that are used should provide the closed-loop with robust stability, large bandwidth, high resolution, disturbance rejection and noise attenuation. Conveniently, the field of scanning probe microscopes (SPMs) have already flourished on this aspect of controller algorithms proven to …
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Design and analysis of a monolithic flexure atomic force microscope
… the moving stage. A digital control system uses closed loop control to regulate the vertical displacement of the stage. The positioning system demonstrated a 450 Hz -3db closed loop bandwidth and 0.249 RMS noise positioning. A new probe named after its inventor Dr. Terunobu Akiyama is implemented …
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Online Identification, Monitoring, and Control of A Dc/Dc Converter System Using Digital Network Analyzer Techniques
… is used to excite the system with a wide bandwidth test sequence as the perturbation source, and its digital control platform is used as the digital signal processor to acquire and post-process the response data. This online network analyzer functionality allows new flexibility in the …
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Contributions to the dynamics of helicopters with active rotor controls
This dissertation presents an aeromechanical closed loop stability and response analysis of a hingeless rotor helicopter with a Higher Harmonic Control (HHC) system for vibration reduction. The analysis includes the rigid body dynamics of the helicopter and blade flexibility. The gain matrix is …
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Application of field programmable analog arrays (FPAAs) to fast scanning probe microscopy
… very fast nanopositioning systems. However, high-bandwidth requirement on the positioning system poses fundamental limitations on the image resolution. The resolution of an image depends on the controller’s capabilities to attenuate the measurement noises. Tools from robust control theory are …
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Micro-Manipulation and Bandwidth Characterization of Ionic Polymer Actuators
… Control techniques were applied to improve the closed-loop performance of the actuators. Using proportional-integral control, it was demonstrated that ionic polymers are capable of tracking reference inputs better than it was previously thought. This result will validate future experimentation …
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High-frequency Quasi-square-wave Flyback Regulator
… QSW converter was proposed to design the control loop and to understand the small-signal behavior. By adding a simple damping resistor on the traditional small-signal CCM model, it can predict the pole splitting phenomenon observed in QSW converter. With the analytical expressions of the transfer …
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Analysis and Design of a DCM SEPIC PFC with Adjustable Output Voltage
… follower control scheme of DCM PFC, single loop controller and notch filter design are discussed. With properly designed notch filter or the PR controller in another word, the closed loop bandwidth can be increased; simple PI controller is sufficient to achieve high power factor; THD of the …
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Novel load identification techniques and a steady state self-tuning prototype for switching mode power supplies
… in the achievable dynamic performances of the closed loop system. Indeed, analogto-digital conversion times, computational delays and sampling-related delays strongly limit the small signal closed loop bandwidth of a digitally controlled SMPS. Quantization effects set other severe constraints …