Download Basic Feedback Controls in Biomedicine (Synthesis Lectures by Charles Lessard PDF

By Charles Lessard

This textbook is meant for undergraduate scholars (juniors or seniors) in Biomedical Engineering, with the most objective of aiding those scholars find out about classical keep an eye on conception and its program in physiological structures. additionally, scholars could be in a position to practice the Laboratory digital Instrumentation Engineering Workbench (LabVIEW) Controls and Simulation Modules to mammalian body structure. the 1st 4 chapters overview prior paintings on differential equations for electric and mechanical structures. Chapters five via eight current the overall kinds and features of suggestions regulate structures and foot locus, frequency reaction, and research of balance and margins. Chapters nine via 12 hide simple LabVIEW programming, the regulate module with its pallets, and the simulation module with its pallets. Chapters thirteen via 17 current numerous physiological types with a number of LabVIEW regulate analyses. those chapters disguise regulate of the center (heart fee, stroke quantity, and cardiac output), the vestibular process and its position in governing equilibrium and perceived orientation, vestibulo-ocular reflex in stabilizing a picture at the floor of the retina in the course of head circulation, mechanical keep watch over versions of human gait (walking movement), and the respiration keep watch over version. The latter chapters (Chapters 13-17) mix information from my category lecture notes in regard to the applying of LabVIEW keep watch over programming via the category to supply the keep watch over digital tools and graphical monitors (root locus, Bode plots, and Nyquist plot). This textbook used to be constructed in cooperation with nationwide tools body of workers. desk of Contents: electric method Equations / Mechanical Translation structures / Mechanical Rotational platforms / Thermal platforms and platforms illustration / features and kinds of suggestions regulate platforms / Root Locus / Frequency reaction research / balance and Margins / creation to LabVIEW / regulate layout in LabVIEW / Simulation in LabVIEW / LabVIEW keep watch over layout and Simulation workout / Cardiac keep watch over / Vestibular keep watch over procedure / Vestibulo-Ocular regulate approach / Gait and Stance regulate procedure / breathing regulate approach

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7 Lm J 2 d ωm + KT Rm J + Lm B dωm + KT Rm B + K b ωm KT FIELD CONTROL MODE With the second servomotor control mode, the armature current is held constant and the field current is varied. With field controls, the torque is proportional to the flux of the magnetic field, Φ, as shown in the following equation. Mechanical rotational systems 23 T(t) = K3Φim = K3 K2ifim where Φ = K2if. With the armature current, im held constant, and letting Kf = K3K2im, then the simplified equation becomes T(t) = Kfif Motor speed control is obtained by varying the voltage to the “field windings” (ef ).

12. References [1] Phillips, C. , and Harbor, R. , Prentice-Hall, Upper Saddle River, NJ (2000). , Servomechanisms and Regulating Systems, John Wiley & Sons, New York, NY (1954). [3] Van Valkenburg, M. , Prentice-Hall, Englewood Cliffs, NJ (1964). • • • • 36 chapter 5 Characteristics and Types of Feedback Control Systems So far, we have reviewed the transfer functions of open- and closed-loop systems. From the transfer function’s basic characteristics, transient and steady-state analysis may be made on the feedbackcontrolled system.

4. 1: Typical underdamped response to a step function. remain within a prescribed percentage of the final value. Common values used for settling time are 2% and 5% and is applied to the envelope that yields ts. 5. Frequency of oscillation of the transient, ωd. The time response will differ for each set of initial conditions; therefore, to compare the time response of various systems, it is necessary to start with the same standard initial conditions. The most practical standard is to start with the system at rest.

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