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Karbasizadeh, Nima (author), Ahmadi Dastjerdi, A. (author), Saikumar, N. (author), Hassan HosseinNia, S. (author)This article addresses nonlinearity in reset elements and its effects. Reset elements are known for having less phase lag based on describing function (DF) analysis compared to their linear counterparts; however, they are nonlinear elements and produce higher-order harmonics. This article investigates the steady-state higher-order harmonics for...journal article 2023
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Buitenhuis, R. N. (author), Saikumar, N. (author), Hassan HosseinNia, S. (author)The ever-increasing industry desire for improved performance makes linear controller design run into fundamental limitations. Nonlinear control methods such as Reset Control (RC) are needed to overcome these. RC is a promising candidate since, unlike other nonlinear methods, it easily integrates into the industry-preferred PID design...journal article 2023
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Ahmadi Dastjerdi, A. (author), Astolfi, Alessandro (author), Saikumar, N. (author), Karbasizadeh, Nima (author), Valerio, Duarte (author), Hassan HosseinNia, S. (author)This article introduces a closed-loop frequency analysis tool for reset control systems. To begin with sufficient conditions for the existence of the steady-state response for a closed-loop system with a reset element and driven by periodic references are provided. It is then shown that, under specific conditions, such a steady-state response...journal article 2023
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Saikumar, N. (author), Heinen, Kars (author), Hassan HosseinNia, S. (author)The authors regret for the typographical error in Eq. (13) and provide the corrected version below: The authors would like to apologize for any inconvenience caused.journal article 2023
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Hooijschuur, R.H.T. (author), Saikumar, N. (author), Hassan HosseinNia, S. (author), van Ostayen, R.A.J. (author)This paper presents the development of a contactless sensing system and the dynamic evaluation of an air-bearing based precision wafer positioning system. The contactless positioning stage is a response to the trend seen in the high-tech industry, where the substrates are becoming thinner and larger to reduce the cost and increase the yield....journal article 2022
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Sebastian, Aldo (author), Karbasizadeh, Nima (author), Saikumar, N. (author), Hossein Nia Kani, S.H. (author)Linear control such as PID possesses fundamental limitations, seen through the Waterbed effect. Reset control has been found to be able to overcome these limitations, while still maintaining the simplicity and ease of use of PID control due to its compatibility with the loop shaping method. However, the resetting action also gives rise to...conference paper 2021
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Hooijschuur, R.H.T. (author), Saikumar, N. (author), Hossein Nia Kani, S.H. (author), van Ostayen, R.A.J. (author)This paper presents the development of a contactless sensing system and the dynamic evaluation of an air-bearing-based precision wafer positioning system. The contactless positioning stage is a response to the trend seen in the high-tech industry, where the substrates are becoming thinner and larger to reduce the cost and increase the yield....journal article 2021
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Karbasizadeh, Nima (author), Saikumar, N. (author), Hassan HosseinNia, S. (author)This paper proposes a fractional-order reset element whose architecture allows for the suppression of nonlinear effects for a range of frequencies. Suppressing the nonlinear effects of a reset element for the desired frequency range while maintaining it for the rest is beneficial, especially when it is used in the framework of a “Constant in...journal article 2021
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Saikumar, N. (author), Heinen, Kars (author), Hassan HosseinNia, S. (author)The ever-growing demands on speed and precision from the precision motion industry have pushed control requirements to reach the limitations of linear control theory. Nonlinear controllers like reset provide a viable alternative since they can be easily integrated into the existing linear controller structure and designed using industry...journal article 2021
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Karbasizadeh, Nima (author), Ahmadi Dastjerdi, A. (author), Saikumar, N. (author), Valerio, Duarte (author), Hassan HosseinNia, S. (author)This paper addresses a phenomenon caused by resetting only one of the two states of a so-called second order 'Constant in gain Lead in phase' (CgLp) element. CgLp is a recently introduced reset-based nonlinear element, bound to circumvent the well-known linear control limitation - the waterbed effect. The ideal behaviour of such a filter in...conference paper 2020
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ShirdastBahnamiri, Mahmoud (author), Karbasizadeh, Nima (author), Ahmadi Dastjerdi, A. (author), Saikumar, N. (author), Hassan HosseinNia, S. (author)This paper presents the tuning of a reset-based element called “Constant in gain and Lead in phase” (CgLp) in order to achieve desired precision performance in tracking and steady state. CgLp has been recently introduced to overcome the inherent linear control limitation - the waterbed effect. The analysis of reset controllers including ones...journal article 2020
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Chen, Linda (author), Saikumar, N. (author), Hossein Nia Kani, S.H. (author)In this paper, a framework for the combination of robust fractional-order CRONE control with nonlinear reset is given for both first and second generation CRONE control. General design rules are derived and presented for these CRONE reset controllers. Within this framework, fractional-order control allows for better tuning of the open-loop...journal article 2019
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Saikumar, N. (author), Sinha, Rahul Kumar (author), Hassan HosseinNia, S. (author)This paper presents a novel nonlinear (reset) disturbance observer for dynamic compensation of bounded nonlinearities like hysteresis in piezoelectric actuators. Proposed Resetting Disturbance Observer (RDOB) utilizes a novel Constant-gain Lead-phase (CgLp) element based on the concept of reset control. The fundamental limitations of linear...journal article 2019
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Akyiiz, Erdi (author), Saikumar, N. (author), Hossein Nia Kani, S.H. (author)The high tech industry which requires fast stable motion with nanometer precision continues to mainly use PID which is limited by fundamental linear control limitations. Floor vibrations as disturbance significantly affect performance and their rejection is particularly affected by these limitations. Reset control has provided a promising...journal article 2019
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Saikumar, N. (author), Valério, D.P.M.O. (author), Hassan HosseinNia, S. (author)This paper presents a complex order filter developed and subsequently integrated into a PID-based controller design. The nonlinear filter is designed with reset elements to have describing function based frequency response similar to that of a linear (practically non-implementable) complex order filter. This allows for a design which has a...conference paper 2019
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Saikumar, N. (author), Sinha, Rahul Kumar (author), Hassan HosseinNia, S. (author)This paper presents a novel 'Constant in gain Lead in phase' (CgLp) element using nonlinear reset technique. PID is the industrial workhorse even to this day in high-tech precision positioning applications. However, Bode's gain phase relationship and waterbed effect fundamentally limit performance of PID and other linear controllers. This...journal article 2019
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Valério, D.P.M.O. (author), Saikumar, N. (author), Ahmadi Dastjerdi, A. (author), Karbasizadeh, Nima (author), Hassan HosseinNia, S. (author)A controller with the frequency response of a complex order derivative may have a gain that decreases with frequency, while the phase increases. This behaviour may be desirable to ensure simultaneous rejection of high-frequency noise and robustness to variations of the open-loop gain. Implementations of such complex order controllers found in...journal article 2019
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Aravind, M.A. (author), Saikumar, N. (author), Dinesh, N. S. (author), Rajanna, K. (author)Experience mapping based predictive controller (EMPC) is a recently developed controller based on the concepts of Human Motor Control. It has been demonstrated to out-perform other classical controllers like proportional-derivative (PD), model reference based adaptive controller (MRAC), linear quadratic regulator (LQR) and the linear...journal article 2018
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van Duist, Lennart (author), van der Gugten, Gijs (author), Toten, Daan (author), Saikumar, N. (author), Hassan HosseinNia, S. (author)A novel toolbox named FLOreS is presented for intuitive design of fractional order controllers (FOC) using industry standard loop shaping technique. This will allow control engineers to use frequency response data (FRD) of the plant to design FOCs by shaping the open loop to meet the necessary specifications of stability, robustness, tracking...journal article 2018