Experimental analyses of dynamical systems involving shape memory alloys

Enemark, Søren; Savi, Marcelo A.; Santos, Ilmar

doi:10.12989/sss.2015.15.6.1521

Cited by 9 publications

(4 citation statements)

References 32 publications

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“…When discussing innovative bearing systems, shape memory alloys are worth mentioning. As demonstrated by the research already carried out, these types of alloys can be used to change the properties of supports in rotor-bearing systems (Enemark et al, 2015), which allows us to actively control the characteristics of the rotating system during its operation (in a certain range).…”

Section: Introductionmentioning

confidence: 99%

Investigation of Gas Foil Bearings With an Adaptive and Non-Linear Structure

Żywica

Bagiński

2019

Acta Mechanica Et Automatica

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The article discusses the results of simulation-based and experimental research carried out on gas foil bearings. Owing to the use of a set of flexible thin foils in such bearings, they exhibit certain beneficial features that cannot be found in other types of bearings. They have nonlinear operational characteristics and allow the dissipation of excess energy, thus reducing the vibration level. Moreover, gas foil bearings can self-adapt themselves to the current operating conditions by changing the shape of the lubrication gap. Therefore, they can be used to improve the dynamic performance of rotors, in particular, those operating at very high rotational speeds. This article explains the mechanisms for changes of stiffness and vibration damping in compliant components of a foil bearing. The results of the analysis of the bearing’s subassemblies using advanced numerical models are presented. They are followed by conclusions that were drawn not only from these results but also from the results of the experimental research. It has been proven that the rotor supported on carefully designed foil bearings is capable of maintaining a low vibration level, even if it operates at a high rotational speed.

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Section: Introductionmentioning

confidence: 99%

Investigation of Gas Foil Bearings With an Adaptive and Non-Linear Structure

Żywica

Bagiński

2019

Acta Mechanica Et Automatica

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“…Vibration control techniques employing SMAs are reported in the literature for general vibration problems (Aguiar et al, 2013; Enemark et al, 2015; Gandhi and Chapuis, 2002; Lee and Pai, 2015; Mani and Senthilkumar, 2015; Mishra et al, 2013; Rezaei Da et al, 2012; Savi et al, 2011), including the vibration response enhancement of civil structures (Alam et al, 2007; Auricchio et al, 2006; Cismaiu and Santos, 2008; Huang et al, 2014; Ibrahim, 2008; Janke, 2005; Kuang and Ou, 2008; Mani and Senthilkumar, 2015; Ozbulut et al, 2011; Sun and Lv, 2015; Torra et al, 2007; Wang and Wu, 2012; Zuo and Li, 2011) as well as aerospace structures (Bachmann et al, 2012; Barzegari et al, 2012, 2015; Sousa and De Marqui, 2016; Ibrahim, 2008; Korkmaz, 2011; Tawfik et al, 2002; Yun et al, 2006). In some cases, thermal activation of SMA actuators (such as SMA wires) embedded into a host structure leads to stiffness control and frequency tuning of the system (related to active control) (Aguiar et al, 2013; Enemark et al, 2015). In other cases, fully passive systems that exploit the pseudoelastic hysteresis (or hysteretic damping) of superelastic SMA elements are considered to improve the vibration response of a structure (Ibrahim, 2008) as well as to introduce self-repairing features (Alam et al, 2007; Kuang and Ou, 2008; Wang and Wu, 2012).…”

Section: Introductionmentioning

confidence: 99%

Experimental study on the aeroelastic behavior of a typical airfoil section with superelastic shape memory alloy springs

Sousa

Marqui

2017

Journal of Intelligent Material Systems and Structures

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An experimental study on the aeroelastic behavior of a 2-degree-of-freedom typical airfoil section with superelastic shape memory alloy springs is reported. Shape memory alloy helical springs are included in the pitch degree-of-freedom of the typical section so that the effects of pseudoelastic hysteresis on the aeroelastic behavior of the system can be investigated. The experimental identification of the aeroelastic parameters is described. Wind tunnel tests are conducted for different shape memory alloy springs’ preload levels, airflow speeds, and initial conditions. It is shown that the linear unstable post-flutter behavior is transformed into stable limit cycle oscillations of acceptable amplitudes over a range of airflow speeds due to pseudoelastic hysteresis. Therefore, shape memory alloy springs can be effectively exploited to passively enhance the aeroelastic behavior of a typical section.

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“…A surface lm interaction" with convection parameter 460h = 0.4 kW/m 2 K (Enemark et al, 2015;Pathak et al, 2010) is kept constant throughout the whole analysis to control heat exchanges. Such boundary conditions ressemble to that of a real experiment at room temperature.…”

Section: Iso-thermal Non-proportional Loadingmentioning

confidence: 99%

Modeling of coupled phase transformation and reorientation in shape memory alloys under non-proportional thermomechanical loading

Chatziathanasiou

Chemisky

Chatzigeorgiou

et al. 2016

International Journal of Plasticity

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is an open access repository that collects the work of Arts et Métiers ParisTech researchers and makes it freely available over the web where possible. AbstractIn the present study, a new 3D thermodynamic coupled model is proposed for SMAs.The behavior of SMA structures is described through several strain mechanisms, each associated with its proper internal variables. This model is built to capture the particular behavior of SMAs when subjected to complex loading, namely non-proportional thermomechanical loading. To achieve this task, a new approach to describe the martensitic reorientation mechanism has been introduced in conjuction with a new method to account for forward and reverse transformation. Thermomechanical coupling, related to dissipation and latent heat is fully implemented. The validity of the model is demonstrated by comparing experimental results of complex thermomechanical loading paths of SMA structures with numerical simulations.

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Experimental analyses of dynamical systems involving shape memory alloys

Cited by 9 publications

References 32 publications

Investigation of Gas Foil Bearings With an Adaptive and Non-Linear Structure

Investigation of Gas Foil Bearings With an Adaptive and Non-Linear Structure

Experimental study on the aeroelastic behavior of a typical airfoil section with superelastic shape memory alloy springs

Modeling of coupled phase transformation and reorientation in shape memory alloys under non-proportional thermomechanical loading

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