Modified Smith predictor and controller for time delay processes

Padhan, Dola Gobinda; Majhi, Somanath

doi:10.1049/el.2011.0378

Cited by 23 publications

(8 citation statements)

References 6 publications

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“…With (8), (13), (15), and (17), the temperature and gas quality can be obtained as function of time. The mass of gas flowing in and out of the tank can be expressed by the equation of state PV = mrT and r = R/M.…”

Section: Mathematical Model Of Tank Temperature and Pressurementioning

confidence: 99%

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Robust Control of Pressure for LNG Carrier Cargo Handling System via Mirror‐Mapping Approach

et al. 2018

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The pressure control for a liquid nature gas (LNG) ship is vital for the cargo handling system which is a nonlinear, unstable, and controllable complex system accompanied by the dynamics of time delay. To improve the control effect, this article proposed a robust controller based on closed-loop gain shaping algorithm by mirror-mapping approach. In addition, the complete mechanism models for the system are established to predict the changes of temperature, pressure, and liquid inventory in the cargo tank. The heat exchanges and evaporation of liquid are also considered. By collecting the data from the LNG ship "Dapeng," the system models are validated. At the same time, the comparative experiment is introduced to verify the reliability and effectiveness. The scheme has been compared with the 2-DOF structure control law of modified Smith predictor. The comparative experimental results show that the scheme proposed in this note has a strong disturbance rejection ability and steady-state performance. The controller designed in this note has advantages of simplified construction method, satisfactory control effect and robustness.

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Section: Mathematical Model Of Tank Temperature and Pressurementioning

confidence: 99%

“…Guan et al [14] proposed a robust control scheme based on the closed-loop gain shaping algorithm that offered a simplifying controller for processes with time delay. Padhan and Majhi [15] proposed a modified Smith predictor control scheme for controlling stable and integrating and unstable processes with time delay.…”

Section: Introductionmentioning

confidence: 99%

Robust Control of Pressure for LNG Carrier Cargo Handling System via Mirror‐Mapping Approach

et al. 2018

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“…1. Among the delay compensators, this Letter first investigates the well-known Smith predictor [1] and communication disturbance observer (CDOB) [2]. Since those methods show limited performances under uncertain delay time information and/or external disturbances, a novel control structure is presented by combining a disturbance observer [3,4] on the slave side as shown in Fig.…”

Section: Fig 1 Control System With Delay Compensatormentioning

confidence: 99%

Robustness improvement of DC motor speed control using communication disturbance observer under uncertain time delay

et al. 2017

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The speed control problem of a time-delay DC motor system is proposed because the control performance can severely deteriorate under uncertain delay time information. Since most of existing delay compensators require exact system parameters and delay time information, the performance improvement has been limited under delay time uncertainty. The proposed method incorporates a disturbance observer on the slave side of the system with a communication disturbance observer that does not require the delay time information for generating a predicted output signal. The effectiveness of the proposed algorithm is tested through comparative simulations and experiments using a testbed system under large delay time uncertainty.

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“…Delay compensation when d = 0: This section investigates Smith predictor (SP) [2] and CDOB [3] as an output predictor for generating v c . When d = 0, the Laplace transform of (2) is given by…”

Section: C(s)mentioning

confidence: 99%

Robust predictor‐based DC motor speed control under uncertain time delay

2017

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A robust speed controller for a time-delay DC motor system is presented under large delay time uncertainty. Unlike a recent result relying on a disturbance observer on the slave side of the system, a new delay compensator is devised and combined with a lowpass filter to improve its robustness against uncertain delay times and external disturbances. The effectiveness of the proposed method is tested through comparative simulations and experiments using a testbed system.

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Modified Smith predictor and controller for time delay processes

Cited by 23 publications

References 6 publications

Robust Control of Pressure for LNG Carrier Cargo Handling System via Mirror‐Mapping Approach

Robust Control of Pressure for LNG Carrier Cargo Handling System via Mirror‐Mapping Approach

Robustness improvement of DC motor speed control using communication disturbance observer under uncertain time delay

Robust predictor‐based DC motor speed control under uncertain time delay

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