# Closed-Loop Identification of Two-Input Two-Output Critically Damped Second-Order Systems with Delay

##### Citations

6 citations

### Cites methods from "Closed-Loop Identification of Two-I..."

...In visioli [19], a BLT technique is used, and in Davison[20], a controller has obtained an underdamped response These controller parameters are placed as in Table V These two methods are compared with the proposed methodology that uses the firefly algorithm to obtain a simplified design of controller by minimization of the objective function as in (4)....

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...In visioli [19], a BLT technique is used, and in Davison[20], a controller has obtained an underdamped response These controller parameters are placed as in Table V These two methods are compared with the proposed methodology that uses the firefly algorithm to obtain a simplified design of controller by minimization of the objective function as in (4)....

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##### References

350 citations

340 citations

185 citations

### "Closed-Loop Identification of Two-I..." refers methods in this paper

...The initial guess values for τeij and ζij are obtained from the Yuwana and Seborg [2] method....

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...The initial guess for τeij and ζij parameters is taken from the values obtained using the Yuwana–Seborg method [2] and is given in Table 4....

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...Yuwana and Seborg [2] have proposed an analytical method to estimate the parameters of a first-order plus time delay (FOPTD) model from the closed-loop response data under a P controller....

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...They identified the individual closed-loop responses and interactions of an SOPTD model using the Yuwana and Seborg method [2]....

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...The interaction responses yc21 and yc12 are identified using the Yuwana and Seborg [2] method since the method given by Clark [11] does not have normalized plots for responses whose final steady state is zero....

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152 citations

### "Closed-Loop Identification of Two-I..." refers methods in this paper

...For the identification of the single-input single-output (SISO) models, Sundaresan and Krishnaswamy [1] have proposed methods for estimating the parameters of a process from its moments, s-plane frequency or transient response data....

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...Melo and Friedly [5] have extended the frequency response technique for an SISO system proposed by Rajakumar and Krishnaswamy [6] for the online identification of open-loop transfer function models of an MIMO process....

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51 citations

### "Closed-Loop Identification of Two-I..." refers background or methods in this paper

...The interaction responses yc21 and yc12 are identified using the Yuwana and Seborg [2] method since the method given by Clark [11] does not have normalized plots for responses whose final steady state is zero....

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...Since the closed-loop system will be of higher order, the normalized step response curve given by Clark [11] is used to identify the main responses of a third-order transfer function model....

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...The comparison of the actual response and responses identified using the Clark method [11] is shown in Fig....

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...The responses are compared with the plot given in [11]....

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...It can be seen that main responses identified using the Clark [11] method match the actual main responses much better than the main responses identified using the Yuwana and Seborg [2] method....

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