The control for the disturbance in the system with time delay

Takehara, Touru; Kunitake, T.; Hashimoto, Hideki; Harashima, F.

doi:10.1109/amc.1996.509431

Cited by 13 publications

(6 citation statements)

References 2 publications

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“…Example 1 A stable second order plus dead time process is adopted. This process was considered by Takahara et al [28]. The simulation conditions given are the same as in the literature [28].…”

Section: Case Studymentioning

confidence: 99%

“…This process was considered by Takahara et al [28]. The simulation conditions given are the same as in the literature [28]. In [28] the transfer function of the process is In this example and the following one, the fractional controller is approximated with integer order transfer functions.…”

Section: Case Studymentioning

confidence: 99%

“…The simulation conditions given are the same as in the literature [28]. In [28] the transfer function of the process is In this example and the following one, the fractional controller is approximated with integer order transfer functions. As mentioned before the approximated transfer function is determined based on Oustaloup method.…”

Section: Case Studymentioning

confidence: 99%

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A New Approach to Design Smith Predictor Based Fractional Order Controllers

Khandani¹,

Jalali²

2010

IJCEE

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I. INTRODUCTIONDead times, or time delays, are found in many processes in industry. Dead times are mainly caused by the time required to transport mass, energy or information, but they can also be caused by processing time or by the accumulation of time lags in a number of simple dynamic systems connected in series [1]. Compared to processes without delays, the presence of a delay in the process greatly complicates the analytical aspects of the control system design, making it more difficult to achieve a satisfactory level of control [2]. Time-delay has been a common phenomenon to overcome whenever we close a feedback loop for the purpose of controlling any system. Recent increase of control applications in the variety gives more importance to systematic methods to cope with time delay. In order to compensate the negative effects of time delay, a well-known and highly effective dead-time compensator for stable processes is Smith predictor [3]. In this predictor scheme, a mathematical model of the process is implemented in an internal feedback loop around a conventional controller. The distinctive scheme was proposed by O.J.M.Smith approximately 50 years ago, and is still attracting much attention for its usefulness. The major advantage of the Smith predictor is that delay issues can be ignored when designing the controller.Fractional-order dynamic systems and controllers, which are based on fractional-order calculus have been gaining attention in several research communities since the last few years [4]. A few recent works in this direction as well as

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Section: Case Studymentioning

confidence: 99%

Section: Case Studymentioning

confidence: 99%

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A New Approach to Design Smith Predictor Based Fractional Order Controllers

Khandani¹,

Jalali²

2010

IJCEE

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“…The disturbance estimation observer (20) , which is a disturbance observer for time-delay system, is implemented in all methods for reducing the effect of the disturbance such as static friction. The compensation current generated by the disturbance estimated observer is represented as…”

Section: Methodsmentioning

confidence: 99%

Time Delay Compensation Using Equivalent Elastic Force Feedback

Saito

Katsura

2015

IEEJ Journal IA

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This paper proposes a novel time-delay compensation based on the feedback of an elastic force from a wave system. In the previous research, the authors derived wave representation of a time-delay system and showed that there is equivalence between a resonant system, which is expressed by the wave equation, and a time-delay system: both systems consist of a position-input system and a wave-transmission system. Considering the above equivalence, we can infer that the cause of vibrations in the time-delay system is the robustness of the position-input system against the wave-transmission system, as in the case of the resonant system. To reduce the robustness, the feedback of an equivalent elastic force, which is derived from the wave representation, is introduced according to the concept of a resonant ratio control, which is one of vibration control method on a two-mass resonant system. Because the feedback of the elastic force can reduce the equivalent mass of the position-input system, the vibrations due to the time delay are suppressed. The disturbance-suppression performance of the proposed method is superior to that of a Smith predictor and a communication disturbance observer because the proposed method can maintain the feedback characteristic. The validity of the proposed method is confirmed by simulation and experimental results.

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“…This method was used in 1996 first for systems without time-delay [6]. After introduction of this method, ongoing research was done to apply this method to systems with time-delay [7], [8], [9], [10] and [11].…”

Section: Introductionmentioning

confidence: 99%

Closing the motion control loops via industrial ethernet network

Krejci

Popule

Goubej

2014

Proceedings of the 2014 15th International Carpathian Control Conference (ICCC)

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This paper deals with a problem of feedback compensator design for motion control loops equipped with industrial Ethernet communication protocols. The main goal of the paper is to choose proper control structures for a supervisory control system which have to deal with the time delay caused by the communication channel and compare the results with a standard cascade control scheme which is implemented directly in a frequency converter. The discrete-time state-space model of the system is derived and several advanced algorithms for time delay compensation are proposed and evaluated by simulations. Finally, the validity of the used methods is verified experimentally with a Yaskawa servo-drive equipped with EtherCat communication protocol. It is shown that proper control structure is able to compensate the effects of communication delay and the results are comparable to direct implementation of the motion control loop in the frequency inverter.

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The control for the disturbance in the system with time delay

Cited by 13 publications

References 2 publications

A New Approach to Design Smith Predictor Based Fractional Order Controllers

A New Approach to Design Smith Predictor Based Fractional Order Controllers

Time Delay Compensation Using Equivalent Elastic Force Feedback

Closing the motion control loops via industrial ethernet network

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