Slawomir Jan Stepien, Paulina Superczynska, Damian Dobrowolski and Jerzy Dobrowolski
The purpose of the paper is to present modeling and control of a nonlinear mechatronic system. To solve the control problem, the modified state-dependent Riccati equation (SDRE…
Abstract
Purpose
The purpose of the paper is to present modeling and control of a nonlinear mechatronic system. To solve the control problem, the modified state-dependent Riccati equation (SDRE) method is applied. The control problem is designed and analyzed using the nonlinear feedback gain strategy for the infinite time horizon problem.
Design/methodology/approach
As a new contribution, this paper deals with state-dependent parametrization as an effective modeling of the mechatronic system and shows how to modify the classical form of the SDRE method to reduce computational effort during feedback gain computation. The numerical example compares described methods and confirms usefulness of the proposed technique.
Findings
The proposed control technique can ensure optimal dynamic response, reducing computational effort during control law computation. The effectiveness of the proposed control strategy is verified via numerical simulation.
Originality/value
The authors introduced an innovative approach to the well-known SDRE control methodology and settled their research in the newest literature coverage for this issue.
Details
Keywords
Tomasz Olejniczak, Anna Pikos and Toshio Goto
This study aims to represent an early attempt to define the notion of continuity and empirically illustrate its explanatory potential and methodological challenges.
Abstract
Purpose
This study aims to represent an early attempt to define the notion of continuity and empirically illustrate its explanatory potential and methodological challenges.
Design/methodology/approach
This study combines historical and qualitative research techniques to conduct a qualitative analysis of continuity in the Jablkowski Brothers Department Store, a Polish centennial company. The paper highlights the potential synergies between historical and qualitative methods when applied to the analysis of long periods of time.
Findings
The authors find that using a theoretical framework of continuity provides novel ontological and epistemological insights into the nature of long-lived companies. Based on the findings, the authors present continuity in the context of existing theories and argue that it is a unique concept that deserves more scientific attention and rigorous empirical study.
Originality/value
This study contributes to the existing literature in three ways. First, it provides a brief, interdisciplinary overview of the concept of continuity. Second, it provides an empirical illustration of continuity analysis in a Polish centennial company with extremely discontinuous history. Finally, it positions continuity within the wider context of existing theories and shows how, through continuity, history can contribute to both the practice and theory of management.