Topic 1 - General principles of control theory, servo mechanicanism, gain

Control theory deals with the behavior of dynamical systems. And maintaining Homeostasis - the property of a system, to regulate its internal environment and to maintain a stable, constant condition.

Control process there are two basic types of control. These are feedforward and feedback. Components:

Control system Disturbance - a temporary change in average conditions that causes a change in system Control signal Controller - a device that monitors and affects the operational conditions, referred to as output variables of the system Sensor feedback-signal Referentia signal (setpoint) - target value the system will aim to reach

Open loop (also called a non-feedback controller), is a type of controller which computes its input into a system using only the current state and its model of the system.

close loop - where the system doesn't rely on matter exchange with outside of the system. Feedback controller.

Decrease in aorta pressure Transfer function of aorta pressure (closed loop)

Servomechanism - a type of feedback control system for close loop system. Set point can change

Feedback - arrangement for the automatic self-regulation of a system by returning part of its output as input.

LH, oxytocin

Almost all systems are negative feedback

Gain the quotient of the effect of control (correction) and the deviation from the set-point (error). In other words gain is the ratio between the value of a given parameter of the system when there is no control and when control is in effect. Thus it reflects the 'strength' or effectiveness of control.