Nonlinear aerothermoelastic analysis of deployable control fin with actuator stiffness subjected to high-speed compressible flows

IF 2.3 3区 工程技术 Q2 MECHANICS Acta Mechanica Pub Date : 2024-10-17 DOI:10.1007/s00707-024-04118-3
Amit K. Thawait, Parag Tandaiya, Prakash C. Jain, Abhilash J. Chandy
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Abstract

The current work investigates the aerothermoelastic behavior of control fins with nonlinear deployable joints connected to a nonlinear actuator. The fin is attached to a cylindrical body with a hemispherical bow, and the fin–body configuration is subjected to Mach 6 hypersonic flow with a nonzero angle of attack. A Navier–Stokes flow model-based computational fluid dynamics (CFD) solver is coupled to a finite element thermoelastic solver using mapping-based coupling technique. Diffusion function-based smoothing method is used for the CFD grid deformation. The fin is assumed to be connected to a finite stiffness actuator at the root, and the effects of actuator stiffness, actuator freeplay as well as freeplay at the deployable joint are investigated. Flow field, structural and thermal quantities are evaluated and reported for various fin configurations. A complex coupling between different modes of deformation is observed and it is shown that the actuator rotation or angle of attack, and hence torque, strongly depends on the actuator and joint freeplays. The obtained results indicate a significant increase in instabilities in the fin oscillation with increasing joint and root freeplay.

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对受高速可压缩气流影响的带推杆刚度的可展开控制鳍进行非线性气动热弹性分析
目前的工作研究了带有与非线性致动器相连的非线性可展开接头的控制鳍的气动弹性行为。鳍连接到一个具有半球形艏部的圆柱形体上,鳍-体配置受到具有非零攻角的马赫数 6 高超音速流的作用。采用基于映射的耦合技术,将基于纳维-斯托克斯流模型的计算流体动力学(CFD)求解器与有限元热弹性求解器耦合。基于扩散函数的平滑方法用于 CFD 网格变形。假定鳍片在根部与有限刚度致动器相连,并研究了致动器刚度、致动器自由间隙以及可展开接头处自由间隙的影响。对各种翅片配置的流场、结构和热量进行了评估和报告。观察到不同变形模式之间的复杂耦合,并表明致动器的旋转或攻击角以及扭矩在很大程度上取决于致动器和接头的自由间隙。所得结果表明,随着关节和根部自由间隙的增加,鳍振荡的不稳定性也会显著增加。
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来源期刊
Acta Mechanica
Acta Mechanica 物理-力学
CiteScore
4.30
自引率
14.80%
发文量
292
审稿时长
6.9 months
期刊介绍: Since 1965, the international journal Acta Mechanica has been among the leading journals in the field of theoretical and applied mechanics. In addition to the classical fields such as elasticity, plasticity, vibrations, rigid body dynamics, hydrodynamics, and gasdynamics, it also gives special attention to recently developed areas such as non-Newtonian fluid dynamics, micro/nano mechanics, smart materials and structures, and issues at the interface of mechanics and materials. The journal further publishes papers in such related fields as rheology, thermodynamics, and electromagnetic interactions with fluids and solids. In addition, articles in applied mathematics dealing with significant mechanics problems are also welcome.
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