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Steady State Errors

  • A system has a steady state error when the actual output during steady states deviates from the desired output. This error should be as low as possible to increase the accuracy of the system.
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Static error coefficients 632.png:

637.png 


Static velocity error coefficient

642.png: 647.png 


Static acceleration error coefficient

652.png

657.png


Routh-Hurwitz Criterion:

  • It is a method where we determine the location of poles of a polynomial with constant real coefficients.
  • For applying this method, it is required that no powers of s in the characteristic equation should be absent otherwise the system confirms instability by inspection.
  • All roots of equation must lie in the left half of s-plane.
  • The difficulties while carrying Hurwitz Criterion occur when the first element in any single row of the Routh tabulation is zero, while the elements are not & when the elements in one row of Routh tabulation are all zero.





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