Grafar Tushen Kirki na Iyyaka
Kontrol sistem na grafika ta fayyace yana cikin ziyartar diagram mai kula da kontrol sistem. A nan, kula da transfer function, summing symbols da take off points suka shafi da branches da nodes.
Transfer function ana kiranta transmittance a cikin grafika ta fayyace. Zan iya bayar misalinda y = Kx. Wannan misali zai iya taka da diagram mai kula kamar haka
Wannan misali zai iya taka da grafika ta fayyace, inda x ce input variable node, y ce output variable node da a ce transmittance na branch na da ita da biyu.
Tsarin Rubutun Grafika Ta Fayyace
Fayyacen da ya fi tsara daɗi daɗi ne a cikin branch har zuwa baya da alama a cikin branch.
Output signal na branch shine mafi girman transmittance da input signal na branch.
Input signal a node shine sum of all the signals entering at that node.
Signals propagate through all the branches, leaving a node.
Rubutun Tabbatar Da Expression of Transfer Function for Signal Flow Graph
Kafin, input signal na duka node na graph. Input signal na node shine sum of product of transmittance and the other end node variable of each of the branches arrowed towards the former node.
Tana tabbatar da input signal na duka nodes zai iya taka da numbers of equations which relating node variables and transmittance. More precisely, there will be one unique equation for each of the input variable node.
By solving these equations we get, ultimate input and output of the entire signal flow graph of control system.
Lastly by dividing inspiration of ultimate output to the expression of initial input we calculate the expiration of transfer function of that signal flow graph
Idan P shine forward path transmittance between extreme input and output of a signal flow graph. L1, L2…………………. loop transmittance of first, second,.….. loop of the graph. Then for first signal flow graph of control system, the overall transmittance between extreme input and output is
Then for second signal flow graph of control system, the overall transmittance between extreme input and output is
Here in the figure above, there are two parallel forward paths. Hence, overall transmittance of that signal flow graph of control system will be simple arithmetic sum of forward transmittance of these two parallel paths.
As the each of the parallel paths having one loop associated with it, the forward transmittances of these parallel paths are
Therefore overall transmittance of the signal flow graph is
Mason’s Gain Formula
The overall transmittance or gain of signal flow graph of control system is given by Mason’s Gain Formula and as per the formula the overall transmittance is
Where, Pk is the forward path transmittance of kth in path from a specified input is known to an output node. In arresting Pk no node should be encountered more than once.
Δ is the graph determinant which involves closed loop transmittance and mutual interactions between non-touching loops.
Δ = 1 – (sum of all individual loop transmittances) + (sum of loop transmittance products of all possible pair of non-touching loops) – (sum of loop transmittance products of all possible triplets of non-touching loops) + (……) – (……)
Δ k is the factor associated with the concerned path and involves all closed loop in the graph which are isolated from the forward path under consideration.
The path factor Δk for the kth path is equal to the value of grab determinant of its signal flow graph which exist after erasing the Kth path from the graph.
By using this formula one can easily determine the overall transfer function of control system by converting a block diagram of control system (if given in that form) to its equivalent signal flow graph. Let us illustrate the below given block diagram.
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