The determination and enhancement of compliant modes for high-amplitude actuation in lattices

Soltani, Zahra; Santer, Matthew

doi:10.1016/j.ijsolstr.2020.09.004

Cited by 5 publications

(3 citation statements)

References 15 publications

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“…Thanks to the complaint skin the mechanism guarantees a continuous surface able to generate a well-defined sinusoidal pattern, closer to the corresponding deformation defined for numerical simulations. Details about the structural design and its optimisation can be found in [10,11]. The mechanism generates a sinusoidal travelling wave with a minimal wavelength of λ = 54 mm and a frequency range up to 40 Hz.…”

Section: The Modelmentioning

confidence: 99%

Simultaneous measurements of surface spanwise waves and velocity in a turbulent boundary layer

Fumarola

Santer

Morrison

2023

Preprint

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Among the different passive and active techniques for skin friction drag reduction for turbulent boundary layers, near wall forcing through moving walls is one of the most promising techniques at low Reτ. Fewer studies have looked at the mechanism at high Reτ, closer to flight conditions, largerly because, in this regime, numerical simulations become harder and experiments more challenging. To that end, there is the need of a systematic study for different surface waves and flow conditions. A new model using a kagome lattice is presented. It will be tested in the 10x5 wind tunnel at Reτ ≈ 8000. This work introduces an experimental setup which combines simultaneous measurements of surface displacement and velocity in the boundary layer. Here the results from a shorted version of the model at Reτ ≈ 1000 are presented to demonstrate the capability of the experimental setup.

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Section: The Modelmentioning

confidence: 99%

Simultaneous measurements of surface spanwise waves and velocity in a turbulent boundary layer

Fumarola

Santer

Morrison

2023

Preprint

Self Cite

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“…Similarly, Ou et al [110] presented a group of auxetic-inspired material structures that can transform into various shapes upon compressive loading. Most recently, in [111] a 2D kagome honeycomb was optimized for delivering high amplitude actuation. In the same year, Dunn et al [112] demonstrate that changing the cell size in lattice materials might involve maximizing stiffness in one mode while minimizing it in another.…”

Section: Tailoring Stiffness Via Cellular Materialsmentioning

confidence: 99%

A Review on Tailoring Stiffness in Compliant Systems, via Removing Material: Cellular Materials and Topology Optimization

2021

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Cellular Materials and Topology Optimization use a structured distribution of material to achieve specific mechanical properties. The controlled distribution of material often leads to several advantages including the customization of the resulting mechanical properties; this can be achieved following these two approaches. In this work, a review of these two as approaches used with compliance purposes applied at flexure level is presented. The related literature is assessed with the aim of clarifying how they can be used in tailoring stiffness of flexure elements. Basic concepts needed to understand the fundamental process of each approach are presented. Further, tailoring stiffness is described as an evolutionary process used in compliance applications. Additionally, works that used these approaches to tailor stiffness of flexure elements are described and categorized. Finally, concluding remarks and recommendations to further extend the study of these two approaches in tailoring the stiffness of flexure elements are discussed.

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“…The relationship between rotation and vibration deformation of a slender truss structure equivalent beam was studied. Hu [4] analyzed the dynamic model of a large-scale space truss structure in the development process as well as after expansion and locking. The nonlinear ring truss structure after expansion was a complex high-dimensional system.…”

Section: Introductionmentioning

confidence: 99%

Equivalent Continuum Modeling for Flexible Slender Quadrilateral Truss Structure

Li,

Wang,

Liu

et al. 2024

Machines

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A space in-orbit service simulation experiment platform is a type of equipment platform that allows spacecraft such as satellites and deep-space explorers to be adequately ground tested before launch. The function of the crane system is to drive the target spacecraft to perform a large-scale movement. This study focuses on the dynamics of a space in-orbit service simulation experiment platform with suspension rope and column quadrilateral truss structure as connecting devices. A space in-orbit service simulation experiment platform with a column quadrilateral truss structure as a connecting device is studied, modeled as a crane system–column quadrilateral truss structure–target spacecraft system. For the column quadrilateral truss structure, the equivalent beam model is used to make it equivalent based on the Timoshenko beam theory. The required equivalent stiffness parameters are determined and adjusted. The relative error between the finite element model and the corrected equivalent beam model of the column quadrilateral truss structure is no more than 4.7%. The results indicate that the accuracy of the modified equivalent beam model is sufficient. The improved equivalent beam model has excellent precision according to numerical calculations, and the derived equivalent stiffness parameters may be employed directly in dynamic modeling.

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The determination and enhancement of compliant modes for high-amplitude actuation in lattices

Cited by 5 publications

References 15 publications

Simultaneous measurements of surface spanwise waves and velocity in a turbulent boundary layer

Simultaneous measurements of surface spanwise waves and velocity in a turbulent boundary layer

A Review on Tailoring Stiffness in Compliant Systems, via Removing Material: Cellular Materials and Topology Optimization

Equivalent Continuum Modeling for Flexible Slender Quadrilateral Truss Structure

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