scholarly journals Analysis of the Aerodynamic and Structural Performance of a Cooling Fan with Morphing Blade

2017 ◽  
Author(s):  
Alessio Suman ◽  
Annalisa Fortini ◽  
Nicola Aldi ◽  
Michele Pinelli ◽  
Mattia Merlin
Keyword(s):  
Control Systems ◽  
Passive Control ◽  
Structural Performance ◽  
Shape Variation ◽  
Axial Fan ◽  
Aerodynamic Loads ◽  
Cooling Fan ◽  
Blade Shape ◽  
Shape Characterization

The concept of smart morphing blades, which can control themselves to reduce or eliminate the need for active control systems, is a highly attractive solution in blade technology. In this paper an innovative passive control system based on Shape Memory Alloys (SMAs) is proposed. On the basis of previous thermal and shape characterization of a single morphing blade for a heavy-duty automotive cooling axial fan, this study deals with the numerical analysis of the aerodynamic loads acting on the fan. By coupling CFD and FEM approaches it is possible to analyze the actual blade shape resulting from both the aerodynamic and centrifugal loads. The numerical results indicate that the polymeric blade structure ensures proper resistance and enables shape variation due to the action of the SMA strips.

An Investigation of the Electroaeroelastic Behavior of a Locally Resonant Piezoelectric Metastructure

2018 ◽  
Author(s):  
Gabriel B. Schiavon ◽  
Joao H. R. Dainezi ◽  
Carlos De Marqui
Keyword(s):  
Control Systems ◽  
Smart Materials ◽  
Passive Control ◽  
Flexible Substrates ◽  
Aerodynamic Loads ◽  
Unsteady Aerodynamic ◽  
Control Schemes ◽  
Piezoelectric Layers ◽  
Rotary Wings ◽  
Resonant Shunt

The literature of aeroelasticity includes the use of smart materials to modify the aeroelastic behavior of fixed or rotary wings. In some cases, they are employed as actuators in active control systems while in others the use of smart materials in passive control schemes is investigated. In this work a different approach is investigated. The aeroelastic behavior of a locally resonant electromechanical metastructure made from flexible substrates with piezoelectric layers connected to resonant shunt circuits is investigated. An electromechanically coupled finite element plate model is employed for predicting the electroelasatic behavior of the wing. The unsteady aerodynamic loads are obtained from the doublet lattice model. By combining the structural and aerodynamic models, the aeroelastic behavior of the metastructure over a range of airflow speeds is studied.

Dynamic characterization of complex bridge structures with passive control systems

2011 ◽  
Vol 19 (4) ◽  
pp. 511-534 ◽  
Author(s):  
Rosario Ceravolo ◽  
Nicola Tondini ◽  
Giuseppe Abbiati ◽  
Anil Kumar
Keyword(s):  
Control Systems ◽  
Passive Control ◽  
Dynamic Characterization ◽  
Bridge Structures

scholarly journals Analysis of the Aerodynamic and Structural Performance of a Cooling Fan with Morphing Blade

2017 ◽  
Vol 2 (2) ◽  
pp. 7 ◽  
Author(s):  
Alessio Suman ◽  
Annalisa Fortini ◽  
Nicola Aldi ◽  
Michele Pinelli ◽  
Mattia Merlin
Keyword(s):  
Structural Performance ◽  
Cooling Fan

scholarly journals HMM-based characterization of channel behavior for networked control systems

2012 ◽  
Author(s):  
Jian Chang ◽  
Krishna K. Venkatasubramanian ◽  
Chinwendu Enyioha ◽  
Shreyas Sundaram ◽  
George J. Pappas ◽  
...  
Keyword(s):  
Control Systems ◽  
Networked Control Systems ◽  
Networked Control

Optimization of Low Noise Blade of Small Axial Fan at Low Reynolds Number

2021 ◽  
Vol 263 (6) ◽  
pp. 236-256
Author(s):  
Peixun Yu ◽  
Junqiang Bai ◽  
Xiao Han
Keyword(s):  
Sound Pressure Level ◽  
Optimization Design ◽  
Sound Pressure ◽  
Computational Cost ◽  
Low Noise ◽  
Pressure Level ◽  
Multidisciplinary Optimization ◽  
Axial Fan ◽  
Aerodynamic Efficiency ◽  
Cooling Fan

A multidisciplinary optimization design to simultaneously enhance the aeroacoustic and aerodynamic performance of an cooling fan is performed. The flow analysis of the cooling fan is conducted by solving three dimensional steady-state RANS equations with shear-stress transport turbulence model. Based on the results of the steady flow, aeroacoustic analysis is performed by using the Hanson and Brooks model. A multi-objective optimization is performed to simultaneously improve the efficiency and reduce the sound pressure level through an improved non-dominated sorting gentic algorithm. A Kriging surrogate model is used to approximate the function value while reducing computational cost. Series of optimum designs on the pareto front yielded increases in efficiency and decreases in the sound pressure level compared to the reference design. Through numerical analysis and experimental test, the aerodynamic efficiency is increased by 5% and the total sound pressure level is reduced by 4dB without loss of air volume for the selected optimized cooling fan. The thining of rotor boundary layer and inward load shift are the main factors to improve aerodynamic efficiency and reduce noise of the cooling fan.

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