Performance evaluation of extruded polystyrene foam for aerospace engineering applications using frequency analyses

Karpenko, Mykola; Stosiak, Michał; Deptuła, Adam; Urbanowicz, Kamil; Nugaras, Justas; Królczyk, Grzegorz M.; Żak, Krzysztof

doi:10.1007/s00170-023-11503-0

Cited by 21 publications

(8 citation statements)

References 22 publications

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“…Vibrations, among others, influence fatigue, which is a critical design issue in wind energy structures. An example of methods for analyzing such vibrations, based on frequency response analysis, is studied in [2,3]. Specifically, the analysis showed that porous structure fractions can improve the adaptive characteristics of passive control systems utilized for vibrationreducing applications in the low and intermediate frequency ranges for unmanned aerial vehicles.…”

Section: Introductionmentioning

confidence: 99%

Passive Shunted Piezoelectric Systems for Vibration Control of Wind Turbine Towers: A Feasibility Study

Daraki,

Marakakis,

Alevras

et al. 2024

Energies

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Many countries have a variety of offshore and onshore wind turbines that face extreme aging challenges. Issues with harmful vibrations that must be minimized are addressed in this paper. A new method of wind turbine tower vibration control using piezoelectricity and shunt circuits is proposed in this paper. The passive vibration control method is shown to improve the tower’s structural performance under various environmental loads, like wind and seismic excitations. To examine the effectiveness of the suggested shunted piezoelectric system, a simple surrogate finite element model of a wind turbine tower is considered, and various investigations at the second eigenfrequency are carried out. An alternative way of modeling the studied structure is considered and the results demonstrate better performance. The advantages of setting up structural damping systems for decreasing tower vibrational loads and boosting their structural stability and resilience against extreme events are highlighted throughout this work.

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Section: Introductionmentioning

confidence: 99%

Passive Shunted Piezoelectric Systems for Vibration Control of Wind Turbine Towers: A Feasibility Study

Daraki,

Marakakis,

Alevras

et al. 2024

Energies

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“…For these reasons, some fan manufacturers (including the one under examination) are considering nonmetallic materials, composite materials, and hollow-honeycomb structures. The use of advanced materials can, indeed, change the vibrational modes of the fan, resulting in the control of noise and vibrations, as shown in [15].…”

Section: Introductionmentioning

confidence: 99%

Design of Sinusoidal Leading Edge for Low-Speed Axial Fans Operating under Inflow Distortion

Tieghi,

Delibra,

Van der Spuy

et al. 2024

Energies

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Axial fans may be equipped with passive flow control devices to enhance rotor efficiency or minimize noise emissions. In this regard, blade designs influenced by biomimicry, such as rotors with sinusoidal leading edges (LEs), have gained popularity in recent years. However, their design is predominantly driven by a trial-and-error approach, with limited systematic studies on the influence of rotor performance. Furthermore, their effectiveness is typically evaluated under controlled conditions that may significantly differ from operations in real installation layouts. In this work, a systematic review of the design process for sinusoidal LE axial fan rotors is provided, aiming to summarize previous design experiences. Then, a modified sinusoidal LE is designed and fitted to a 7.3 m low-speed axial fan for air-cooled condensers (ACCs). These fans operate at environmental conditions, providing a quasi-zero static pressure rise, often with inflow non-uniformities. A series of RANS computations were run to simulate the performance of the baseline fan and that of the sinusoidal leading edge, considering a real installation setup at Stellenbosh University, where the ACC is constrained between buildings and has a channel running on the ground below the fan inlet. The aim is to explore the nonbalanced inflow condition effects in both rotor geometries and to test the effect of the installation layout on fan performance. The results show that the modification to the rotor allows for a more even distribution of flow in the blade-to-blade passages with respect to the baseline geometry.

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“…A circuit model of the asynchronous motor and an advanced structural hybrid model of the feeding system was developed, and based on this, the effect of the interaction between the drive motor and the mechanical system with given dynamic characteristics on the dynamic performance of the mechanical system was investigated. In the literature [6], a finite element method of numerical simulation combined with experimental measurements based on frequency response optimization was used to simulate the behavior of porous structures and to verify that porous structure fractions can improve the adaptive performance of automatic control systems for vibration damping applications in the low-and medium-frequency regions. In the literature [7], the D'Alembert formula was employed to model the dynamics of a linear motor feeding system.…”

Section: Introductionmentioning

confidence: 99%

A New Performance Optimization Method for Linear Motor Feeding System

et al. 2023

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The linear motor feeding system is a typical electromechanical coupling system. Conventional characteristic analyses of electromechanical coupling often overlook the influence of flexible deformation in critical components of the linear motor feeding system. Moreover, when employing genetic algorithms to optimize servo system PID control parameters, slow convergence, nonconvergence, or premature convergence problems may arise. To address these issues, this paper proposes a new performance optimization method for a linear motor feeding system. The method uses a combination of “multi-body theory + finite element” to accurately account for the flexible deformation of critical components of the feeding system, establishes a rigid–flexible electromechanical coupling model of the linear motor feeding system, and optimizes the PID parameters of the established model with an improved adaptive genetic algorithm. Simulation results demonstrate that, when utilizing an adaptive genetic algorithm to optimize the rigid–flexible electromechanical coupling model and a control system model that disregards flexible body deformation, the system achieves stability in 0.02 s and 0.027 s with overshoots of 13% and 27%, respectively. These outcomes confirm the accuracy and importance of considering flexible body deformation in the optimization performance of a linear motor feeding system. At the same time, the time required to reach the steady state of the rigid–flexible electromechanical coupling model optimized by the adaptive genetic algorithm is shortened from 0.035 s to 0.02 s. The sinusoidal signal response curve of the optimized system does not exhibit any peak overshoot compared with that of the nonoptimized system, and the response speed is also faster. These results demonstrate the effectiveness of the rigid–flexible electromechanical coupling model optimized by the nonlinear adaptive genetic algorithm. The displacement response curves of the linear motor feeding system under different workbench loads are obtained through experiments and compared with those obtained from simulations to verify the established model and the correctness of the proposed method.

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Performance evaluation of extruded polystyrene foam for aerospace engineering applications using frequency analyses

Cited by 21 publications

References 22 publications

Passive Shunted Piezoelectric Systems for Vibration Control of Wind Turbine Towers: A Feasibility Study

Passive Shunted Piezoelectric Systems for Vibration Control of Wind Turbine Towers: A Feasibility Study

Design of Sinusoidal Leading Edge for Low-Speed Axial Fans Operating under Inflow Distortion

A New Performance Optimization Method for Linear Motor Feeding System

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