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Closed-Loop Frequency Analysis of Reset Control Systems

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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Non-Local Effects of Support Structure Diameter on Wave Induced Fatigue Loads of Monopile-based Offshore Wind Turbines

Castellino, Francesco (author)

One of the main cost drivers of an offshore wind power plant are the support structures of the wind turbines, it is therefore of primary importance to optimize their design. Among the support structures available, the concept most widely adopted is the monopile-based support structure, whose design is often fatigue-driven. Offshore structures...

master thesis 2022

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Overcoming inherent performance limitations in industrial motion stages with reset control: A general approach to the design and implementation of reset controllers validated on an ASMPT AB383 wire bonder

Caporale, Daniel (author)

Linear time-invariant controllers are undoubtedly the most popular type of regulators used in industrial applications, with the overwhelming majority of companies employing them. The reason is mainly given by their simple design methods. In particular, frequency domain predictive performance analysis and stability methods allow the use of...

master thesis 2022

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A lift-off investigation of next-generation offshore wind turbine generator components for feedering in the U.S.: Creating understanding in the release stage of a tower segment

Smorenberg, Marius (author)

Climate change is triggering an ever-growing demand for renewable energy. The U.S. is still far behind Europe when it comes to offshore wind energy. They have made ambitious plans to reach 30 GW in offshore wind energy by 2030 while currently 42 MW is installed. One of the main challenges in the U.S. is the installation method since a...

master thesis 2022

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Torsion motions of high-rise buildings due to wind loading

Richardson, Anthony (author)

A structural firm will not invest a large sum of money in early design fase on a wind tunnel aeroelastic model to determine the displacements, forces, and moments when the dimensions of a building have only been estimated because the outcomes are only valid for that specific model. It is well-known that the outcomes are hard to determine...

master thesis 2022

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Frequency Response Data-driven LPV Controller Synthesis for MIMO Systems

Bloemers, Tom (author), Oomen, T.A.E. (author), Toth, Roland (author)

The linear parameter-varying framework enables systematic control design approaches to meet increasing performance requirements and complexity of systems. The aim of this paper is to develop local frequency response data-based analysis and synthesis conditions for multiple-input multiple-output linear parameter-varying systems to facilitate...

journal article 2022

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Resetting Velocity Feedback: Reset Control for Improved Transient Damping

Mohan, M.A. (author), Kaczmarek, M.B. (author), Hassan HosseinNia, S. (author)

Active vibration control (AVC) is crucial for the structural integrity, precision, and speed of industrial machines. Despite advancements in nonlinear control techniques, most AVC techniques predominantly employ linear feedback control due to their simplicity and ability to be designed in the frequency domain. In this paper, we introduce a reset...

conference paper 2022

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Frequency Response Data-Based LPV Controller Synthesis Applied to a Control Moment Gyroscope

Bloemers, Tom (author), Oomen, T.A.E. (author), Toth, Roland (author)

Control of systems with operating condition-dependent dynamics, including control moment gyroscopes (CMGs), often requires operating condition-dependent controllers to achieve high control performance. The aim of this brief is to develop a frequency response data-driven linear parameter-varying (LPV) control design approach for single-input...

journal article 2022

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Bode Analysis of Uncertain Multivariable Systems

Oomen, T.A.E. (author), Tacx, Paul (author)

Bode plots are crucial for frequency domain analysis of SISO systems. The aim of this paper is to develop a complete approach for Bode plots of multivariable uncertain systems for both the magnitude and phase. The magnitude is based on the singular values. The phase is based on the phase spread of the numerical range. An IQC-based approach is...

conference paper 2022

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Frequency-Domain Analysis of "Constant in Gain Lead in Phase (Cglp)" Reset Compensators: Application to precision motion systems

Ahmadi Dastjerdi, A. (author)

Proportional Integral Derivative (PID) controllers dominate the industry and are used in more than 90 percent of machines in this era. One of the reason for the popularity of these controllers is the existence of easy to use frequency-domain analysis tools such as loop-shaping for this type of controller. Due to the advancement of technology in...

doctoral thesis 2021

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Towards Industrialization of FOPID Controllers: A Survey on Milestones of Fractional-Order Control and Pathways for Future Developments

Tepljakov, Aleksei (author), Alagoz, Baris Baykant (author), Yeroglu, Celaleddin (author), Gonzalez, Emmanuel A. (author), Hassan HosseinNia, S. (author), Petlenkov, Eduard (author), Ates, Abdullah (author), Cech, Martin (author)

The interest in fractional-order (FO) control can be traced back to the late nineteenth century. The growing tendency towards using fractional-order proportional-integral-derivative (FOPID) control has been fueled mainly by the fact that these controllers have additional 'tuning knobs' that allow coherent adjustment of the dynamics of control...

journal article 2021

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A Frequency-Domain Tuning Method For a Class of Reset Control Systems

Ahmadi Dastjerdi, A. (author), Hassan HosseinNia, S. (author)

Constant in gain Lead in phase (CgLp) compensators, which are a type of reset elements, have shown high potential to overcome limitations of linear control systems. There are few works which investigate the tuning of these compensators. However, there are some significant drawbacks which make those methods unreliable. First, their analyses...

journal article 2021

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Development of an Active Cable-Driven, Force-Controlled Robotic System for Walking Rehabilitation

Fang, Juan (author), Haldimann, Michael (author), Marchal Crespo, L. (author), Hunt, Kenneth J. (author)

In a parallel development to traditional rigid rehabilitation robotic systems, cable-driven systems are becoming popular. The robowalk expander product uses passive elastic bands in the training of the lower limbs. However, a well-controlled assistance or resistance is desirable for effective walking relearning and muscle training. To achieve...

journal article 2021

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Quantifying the nonlinear interaction in the nervous system based on phase-locked amplitude relationship

Yang, Y. (author), Yao, Jun (author), Dewald, Julius (author), van der Helm, F.C.T. (author), Schouten, A.C. (author)

This paper introduces the Cross-frequency Amplitude Transfer Function (CATF), a model-free method for quantifying nonlinear stimulus-response interaction based on phase-locked amplitude relationship. The CATF estimates the amplitude transfer from input frequencies at stimulation signal to their harmonics/intermodulation at the response signal....

journal article 2020

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Dual-Band Reduced-Order Model of an HVDC Link Embedded into a Power Network for EMT Studies

Ruiz, Carlos (author), Medina, Edgar (author), Ramirez, Abner (author), Mehrizi-Sani, Ali (author), de Jesus Chavez, Jose (author), Davoudi, Ali (author), Abdel-rahman, Mohamed (author)

This paper presents an approach to obtain reduced-order models for power networks involving power electronic converters (PEC) via the frequency-domain balanced realizations (FDBR) technique. PECs play an essential role in power processing and energy conversion in modern electrical networks, such as the interconnection of renewable generators,...

journal article 2019

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Complex order control for improved loop-shaping in precision positioning

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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Linear fractional order controllers: A survey in the frequency domain

Ahmadi Dastjerdi, A. (author), Vinagre, Blas M. (author), Chen, Yang Quan (author), Hassan HosseinNia, S. (author)

Today, there is a great tendency toward using fractional calculus to solve engineering problems. The control is one of the fields in which fractional calculus has attracted a lot of attention. On the one hand, fractional order dynamic models simulate characteristics of real dynamic systems better than integer order models. On the other hand,...

review 2019

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Fast rotor loss calculations in fractional-slot permanent magnet machines

Wani, F.M. (author), Dong, J. (author), Polinder, H. (author)

Permanent magnet machines with fractional slot windings are popular because of their shorter end windings, low cost and ease of manufacturing. On the other hand, fractional slot machines have higher eddy current losses in the rotor magnets and sleeve. An accurate calculation of these losses usually involves a time-stepped finite-element analysis...

conference paper 2018

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Autoregressive moving average graph filter design

Liu, J. (author), Isufi, E. (author), Leus, G.J.T. (author)

In graph signal processing, signals are processed by explicitly taking into account their underlying structure, which is generally characterized by a graph. In this field, graph filters play a major role to process such signals in the so-called graph frequency domain. In this paper, we focus on the design of autoregressive moving average ...

conference paper 2018

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Dichotomy and stability of disturbed systems with periodic nonlinearities

Smirnova, Vera B. (author), Proskurnikov, A.V. (author), Utina, Natalia V. (author), Titov, Roman V. (author)

Systems that can be decomposed as feedback interconnections of stable linear blocks and periodic nonlinearities arise in many physical and engineering applications. The relevant models e.g. describe oscillations of a viscously damped pendulum, synchronization circuits (phase, frequency and delay locked loops) and networks of coupled power...

conference paper 2018