Nonlocal elasticity in shape memory alloys modeled using peridynamics for solving dynamic problems

Martowicz, Adam; Bryła, Jakub; Staszewski, Wiesław J.; Ruzzene, Massimo; Uhl, T.

doi:10.1007/s11071-019-04943-5

Cited by 14 publications

(7 citation statements)

References 58 publications

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“…GFB equipped with SMAwires substituting bump foils [27] Straightforward active method to control the bearing's stiffness via thermal activation-managing heating (making use of electric current) and cooling (with dedicated pipes with fluids) processes; capability of the bearing's damping control Relatively high inertia of the control process due to the nature of the thermally induced mechanical responses of SMAs, e.g., compared to the PZT-based solutions; Requirement of an effective cooling method 2. Concept of a GFB equipped with SMA wires installed on a top foil [20,21] Straightforward passive method dedicated to reduce mechanical vibrations via energy dissipation available for the phenomenon of superelasticity; experimentally validated SMA wire models for both isothermal and non-isothermal phase transformations dedicated for future use in GFB models Not yet experimentally validated complete SMA-based GFB model 3. Application of PZT valves to control radial air injection (active lubrication) [30,35] Active method with experimentally proven efficiency; fast operation that allows for quick response of the GFB when subjected to the external radial excitation (sudden shocks); high potential of further investigation; reduced demands regarding manufacturing tolerances; advantageous growth of damping coefficients High system complexity; setting the parameters of the PZT valve controller may be a challenge-the performance of the control system must be experimentally verified that may be time consuming 4.…”

Section: Methods Used To Enhancementioning

confidence: 99%

“…The concept of a passive SMA-based GFB is presented in the research [20]. Specifically, a direct installation of SMA wires on the outer surface of the top foil is proposed, e.g., via gluing or soldering.…”

Section: Applications Of Shape Memory Alloys To Gas Foil Bearingsmentioning

confidence: 99%

“…Improvement of elasto-damping properties (referenced in Figure 2) via passive [16][17][18][19][20][21][22][23][24] and active methods [25][26][27][28][29][30][31][32][33][34][35].…”

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confidence: 99%

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Gas Foil Bearing Technology Enhanced with Smart Materials

et al. 2021

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The paper discusses a perspective of the usage of various types of smart materials to enhance the operational properties of Gas Foil Bearings. The authors, referring to the current investigation on thermomechanical characteristics of the above-mentioned bearing type, have focused on the concept of using Shape Memory Alloys, Piezoelectric Transducers, Thermoelectric Modules and Thermocouples to improve both mechanical and thermal behavior of the bearings. Based on the available literature and the authors’ experience, the present work provides an overview of the known and perspective applications of smart materials to Gas Foil Bearings. In particular, a discussion on their capabilities, limitations and effectiveness is conducted, taking into account the unique characteristics and requirements of the studied type of bearings.

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Section: Methods Used To Enhancementioning

confidence: 99%

Section: Applications Of Shape Memory Alloys To Gas Foil Bearingsmentioning

confidence: 99%

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Gas Foil Bearing Technology Enhanced with Smart Materials

et al. 2021

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“…This depicts the ability of the SMA-GFB to swiftly adapt to changing operating conditions. Later, this effect of non-isothermal phase transformations was included in the model of an SMA-based GFB [127,128]. It was depicted that the thermal and mechanical response of the SMA wires can be modeled which is helpful in developing solid-state actuators and dampers.…”

Section: Thermal Managementmentioning

confidence: 99%

A Review on Modeling and Stability Aspects of Gas Foil Bearing Supported Rotors

Khamari¹,

Kumar²,

Behera³

2023

Tribol. Ind.

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Gas foil bearing rotor (GFBR) systems have received significant interest in the field of rotordynamics and vibration analysis. GFBR systems have a wide range of high-speed turbomachinery applications. Due to the high speed, these machines are susceptible to rigorous vibration and instability. Gas foil bearings instigate large amplitude of vibrations at startup and shut down and severe subsynchronous motions during high-speed operations. Over the years, numerous work has been done in the field of high-speed rotors supported on gas foil bearings. Significant improvement has been observed in the stability and feasibility of the GFBR systems. However, accurate model predictions of gas foil bearing still remain a challenge for its widespread usage in high-speed turbomachinery. A comprehensive review needs to be done to study the previous work and pave the way for future research. The current review is majorly divided into three sections. Firstly, various models used for the performance prediction of gas foil bearings are compiled. After that, major causes of instability that manifest during the experiments and practice with gas foil bearing supported rotors is illustrated. Lastly, the developmental attempts made to inhibit the instability is summarised. This paper presents an overall picture of the current engineering scenario and future prospects of the GFBR systems.

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“…2021, 5, 76 2 of computational burden [37,38]. However, compared with the globally-dependent fractional derivative model, many nonlocal processes cannot be fully described by using the PD model, due to its limitation in the selection of memory area [39,40].…”

Section: Introductionmentioning

confidence: 99%

A Nonlocal Fractional Peridynamic Diffusion Model

et al. 2021

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This paper proposes a nonlocal fractional peridynamic (FPD) model to characterize the nonlocality of physical processes or systems, based on analysis with the fractional derivative model (FDM) and the peridynamic (PD) model. The main idea is to use the fractional Euler–Lagrange formula to establish a peridynamic anomalous diffusion model, in which the classical exponential kernel function is replaced by using a power-law kernel function. Fractional Taylor series expansion was used to construct a fractional peridynamic differential operator method to complete the above model. To explore the properties of the FPD model, the FDM, the PD model and the FPD model are dissected via numerical analysis on a diffusion process in complex media. The FPD model provides a generalized model connecting a local model and a nonlocal model for physical systems. The fractional peridynamic differential operator (FPDDO) method provides a simple and efficient numerical method for solving fractional derivative equations.

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Nonlocal elasticity in shape memory alloys modeled using peridynamics for solving dynamic problems

Cited by 14 publications

References 58 publications

Gas Foil Bearing Technology Enhanced with Smart Materials

Gas Foil Bearing Technology Enhanced with Smart Materials

A Review on Modeling and Stability Aspects of Gas Foil Bearing Supported Rotors

A Nonlocal Fractional Peridynamic Diffusion Model

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