Description of the systems with graphical methods
1) Function of transfer to open cycle:
It is given from the product of the trasferenza of the direct branch G(s) for the trasferenza of the branch of H(s) feedback
2) Dominion of belongings of the largenesses that appear in the outlines to blocks :
They belong to the dominion of Laplace in fact in such dominion is only had that the escape largeness is equal to the product of the largeness of the block for the trasferenza of the same one.
3) Trasferenza of 2 blocks in series :
He is equal to the product of the trasferenze of the single blocks.
4) Trasferenza of 2 blocks in parallel :
Two block are in parallel if their incomes are joined from a derivation node and their escapes meet in a sum node, the turning out trasferenza are the algebrica sum of the trasferenze of the single blocks.
5) Effect of the exchange of position between 2 summary nodes :
The exchange can be carried out without ulterior modifications in virtue of the linearity of the transformed ones of Laplace.
6) Like inserting a sommatore node to mount of a block :
Admitting that the block has trasferenza G, the sommatore to mount of the block is moved and on one of the coppers that arrives to the same sommatore it inserts a trasferenza block 1/G.
7) As to insert a sommatore node to they of a block goes :
Admitting that the block has trasferenza G, the sommatore is moved to goes them of the block and on the other branch that arrives to the same sommatore it inserts a block of trasferenza G.
8) Trasferenza of a block that replaces one negative feedback :
The trasferenza of the block in direct chain is G and H the trasferenza of the block in feedback chain, is had
it is observed that in the passage from opened cycle the position of the poles changes.
9) Trasferenza of a block that replaces one positive feedback :
The trasferenza of the block in direct chain is G and H the trasferenza of the block in feedback chain, is had
10) Procedure in order to arrive to an outline to blocks reduced to minimal canonical shape:
to) reducing all the blocks in parallel and series
b) all are reduced the inner rings of feedback
c) to move all the summary nodes to mount and all the nodes of derivation to goes them of inner rings of feedback.
11) As to construct the outline to blocks of the motor in controlled continuum flow on the armor :
The correspondents write themselves equations in the
dominion of Laplace and they characterize like income the tension andto(s) and like escape the angular
velocity Wm of
the rotor. From 
the it is deduced that
it must it are to us a comparatore between the tension applied and
that one induced due to the motion of the rotor, placing to it goes
them of the comparatore a block with trasferenza 
obtainsmthe (s) and from it the
T(s) brace can be obtained through a block with trasferenza KT in fact 
. Being
moreover 
Wm(s) the angular velocity of the motor through a block
with trasferenza can be obtained simply like escape 
,
from Wm(s) is
obtained then marks them of feedback 
Wm(s) placing in feedback chain a block
with trasferenza KT. If it
is wanted to be had instead the escape in position it is necessary to
add a block with trasferenza 1/s.
12) Galvanometer :
It is an instrument that allows to measure tensions electrical workers through the angular movement of an axis evidenced from the movement of a mechanical index. It is come true through a motor in continuum flow controlled on the armor whose exited in position motivating force to the axis of the rotor is connected with one, it contrappone to the T(s) brace one resistant brace Kmq(s) that door to one situation of equilibrium tied to the value of the income andto(s).
13) tachimetrica Dynamo :
Maintaining the flow of excitation of a dynamo constant it
is obtained that the tension captured on the rotor is proporziona them
to its angular velocity, being the constant flow the transfer function
is istantanea 
.
14) Servomeccanismo of position :
It is a feedback control system in degree to obtain that the position of a mechanical device that comes assumed like variable of escape, follows a norm largeness faithfully electrical worker who comes assumed like variable of income. In kind a motor in controlled continuum flow is used on the armor with to mount a block that supplies the power of necessary feeding and to a such reducer from being able goes them to lower the angular velocity increasing the brace, and an integrator so as to to have the escape in position, finally in feedback places a transducer like one as an example tachimetrica dynamo.
15) Transducer :
It concurs to elaborate marks them in escape the process and to render it in compliance with marks them in income.
16) Compensator :
It obtains from the sommatore marks them of correction or of error and in its function it acts on the system so as to to make that the answer satisfies the detailed lists, in the simpler version draft than a gain. It is important to notice that to open cycle the position of the poles depends solo from the system while closed cycle it depends also on this gain or, more in a generalized manner, from the compensator.
17) Way :
It is a copper succession orients to you such that you follow yourself along their distance never more than once for the same node.
18) cyclical Way :
It is a way that is closed on the departure node, also is said ring.
19) Determining of the graph :
It is given from the following formula: 
Where: 
is the sum of the trasferenze of the cycles pertaining to the graph
is the sum of the products of the trasferenze
of the cycles that to two to two do not have of it nodes of coppers in
common
is the sum of the products of the trasferenze
of the cycles that to three to three do not have common nodes or
coppers.
20) Formula of Mason :
It concurs to establish the function of transfer of a
data graph being been 
where D is the determining one of the graph that it obtains after to have eliminated the making coppers and nodes part of the having way i_esimo trasferenza Tthe (s) which it connects the income of the graph with the escape.