A New Methodology for Tuning PID‐Type Fuzzy Logic Controllers Scaling Factors Using Genetic Algorithm of a Discrete‐Time System

Gritli, Wafa; Gharsallaoui, Hajer; Benrejeb, Mohamed

doi:10.5772/intechopen.69604

Cited by 2 publications

(1 citation statement)

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“…If the selected sensor technology does not allow for direct size reductions, external post-processing approaches are introduced, involving the whole array, for instance, using dedicated interpolation and field reconstruction methods [48]. The algorithm logic aimed at coordinating sensor data and actuators' actions may be also dramatically affected by the scaling process: changes in terms of mechanical and thermal inertia, different ranges of force and displacements, and so on, may require dramatic variations in the software parameters or the architecture itself, with an unavoidable impact on stability and the working domain of the referred system [49].…”

Section: Introductionmentioning

confidence: 99%

Scaling Effects on Morphing Structures: Preliminary Guidelines for Managing the Effects on a Case Study

Concilio,

Galasso,

Ameduri

2023

Actuators

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The technique of morphing in aerospace engineering is a relatively new discipline targeting the improvement of aircraft performance, even through dramatic changes to some critical geometrical and mechanical features, to adapt aircrafts’ configurations to evolving operation conditions. The development path of morphing systems is complex and shall pass through articulated gates to prove its readiness level due to the concurrence of different disciplines and approaches. The characterization and demonstration of the concepts in a representative environment, such as wind tunnel test facilities, are some of the most relevant steps needed for the maturation of the engineering technique. The practical size limitations of test facilities usually impose the use of scaled models. In the case of morphing systems, whose architecture is strictly dependent on the available room, and whose performance is tightly correlated with the general structural stiffness, changes in dimensions may affect the overall behaviour significantly. Therefore, the adaptive design may change a lot until it arrives to the formation of completely different products. Transportability issues of certain architectural forms, as well as the different classes of vehicles, are also related to that aspect. The scope of this paper is to investigate the impact of some effects of scaling processes on certain features of a morphing system, particularly focusing on the stiffness parameters, for their impact on several features such as the load bearing capability and structural stability in both steady and dynamic conditions. As a case study, a rotorcraft blade segment integrated with torsional shape memory alloy (SMA) actuators was considered. Relevant numerical models were exploited to highlight the different evolution laws of the characteristic structural parameters vs. the referred scale factors. In this investigation, the axial, flap, lag bending, and torsion stiffnesses, as well as normal modes and stress levels, are considered. The achieved results confirm the complexity of attaining an effective reproduction of the targeted morphing architecture, as scaled configurations are considered. In spite of the unavoidable specificity of the analysis herein reported, it is believed that such attainments can have a general validity at least to some extent, and the outcomes may be exported to other morphing systems, at least as guidelines. This study took place within the European project SABRE (Shape Adaptive Blades for Rotorcraft Efficiency, H2020).

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Section: Introductionmentioning

confidence: 99%