Transfer function

About: Transfer function is a research topic. Over the lifetime, 14362 publications have been published within this topic receiving 214983 citations. The topic is also known as: system function & network function.

Analog and Digital Control System Design: Transfer-Function, State-Space, and Algebraic Methods

Abstract: All chapters except Chapter 2 begin with an Introduction. All chapters except Chapters 1 and 14 end with Problems 1. Introduction 2. Mathematical Preliminary 3. Development of Block Diagrams for Control Systems 4. Quantitative and Qualitative Analyses of Control Systems 5. Computer Simulation and Realizations 6. Design Criteria, Constraints, and Feedback 7. The Root-Locus Method 8. Frequency-Domain Techniques 9. The Inward Approach: Choice of Overall Transfer Functions 10. Implementation: Linear Algebraic Method 11. State Space Design 12. Discrete-Time System Analysis 13. Discrete-Time System Design 14. PID controllers Appendices A. The Laplace Transform B. Linear Algebraic Equations

Three-parameter tunable tilt-integral-derivative (TID) controller

Abstract: A feedback control system compensator of the PID type is provided, wherein the proportional component of the compensator is replaced with a tilted component having a transfer function s to the power of -1/n. The resulting transfer function of the entire compensator more closely approximates an optimal transfer function, thereby achieving improved feedback controller. Further, as compared to conventional PID compensators, the TID compensator allows for simpler tuning, better disturbance rejection ratio, and smaller effects of plant parameter variations on closed loop response.

Vector Control of Single-Phase Voltage-Source Converters Based on Fictive-Axis Emulation

Abstract: This paper presents an alternative way for the current regulation of single-phase voltage-source dc-ac converters in direct-quadrature (dq) synchronous reference frames. In a dq reference frame, ac (time varying) quantities appear as dc (time invariant) ones, allowing the controller to be designed the same as dc-dc converters, presenting infinite control gain at the steady-state operating point to achieve zero steady-state error. The common approach is to create a set of imaginary quantities orthogonal to those of the real single-phase system so as to obtain dc quantities by means of a stationary-frame to rotating-frame transformation. The orthogonal imaginary quantities in common approaches are obtained by phase shifting the real components by a quarter of the fundamental period. The introduction of such delay in the system deteriorates the dynamic response, which becomes slower and oscillatory. In the proposed approach of this paper, the orthogonal quantities are generated by an imaginary system called fictive axis, which runs concurrently with the real one. The proposed approach, which is referred to as fictive-axis emulation, effectively improves the poor dynamics of the conventional approaches while not adding excessive complexity to the controller structure.

Filtering in the time and frequency domains

Abstract: Long regarded as a classic of filter theory and design, this book stands as the most comprehensive treatment of filtering techniques, devices and concepts as well as pertinent mathematical relationships. Analysis and theory are supplemented by detailed design curves, fully explained examples and problem and answer sections. Discussed are the derivation of filtering functions, Fourier, Laplace, Hilbert and z transforms, lowpass responses, the transformation of lowpass into other filter types, the all-pass function, the effect of losses on theoretical responses, matched filtering, methods of time-domain synthesis, and digital filtering. This book is invaluable for engineers other than those who are filter design specialists who need to know about the possibilities and limits of the filtering process in order to use filters competently and confidently in their system designs.