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Inverse design of planar morphing scissor structures with end constraints

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Abstract

Scissor structures can meet different performance goals by actively changing their geometric configurations. This paper focuses on the inverse design problem of planar scissor structures with end constraints to obtain various forms without changing the span. Two strategies are proposed, one based on adding hinges and the other based on telescopic rods. The corresponding geometrical principles and constraint conditions are formulated. An inverse design framework from two predefined target shapes to design parameters is established, which consist of geometry optimization and mobility assessment. Seven case studies are used to illustrate the design method based on the two strategies. Results show potential for application of morphing planar scissor structure in practice.

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Abbreviations

\(\varphi\) :

Relative angle between straight beams in the rigid arm

A :

Rigid arm

\(b^l,b^r\) :

Lengths of left and right straight beams in the rigid arm

DOF:

Degree of freedom

ed :

Constraint coordinates of the right-most node

F :

Optimization result, also called configuration error

\(f_{P1},f_{P2}\) :

Two target shape functions

\(j_k\) :

Node number of k-th hinge nodes

l :

Length of straight beam for isometric arms

m :

Number of hinge nodes

n :

Number of scissor units

o :

Internal connection node between the straight beams in the scissor unit

\(p^l,p^r\) :

Left and right end nodes of rigid arms

\(P_1,P_2\) :

Two target shapes in the optimization

\(Q\left( X_j\right)\) :

Geometry parameter set of the j-th scissor unit

t :

Configuration parameter, \(1 \le {t} \le 2\)

X :

Scissor unit

\(x_{o_j^1}^{P_t},y_{o_j^1}^{P_t}\) :

Coordinates of the node \(o_j^1\) at the target configuration \(P_t\)

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Acknowledgements

The work presented in this article was supported by the National Natural Science Foundation of China (Grant Nos. 51822805, 51878147, and U1937202), Postgraduate Research & Practice Innovation Program of Jiangsu Province (SJKY19_0091), Scientific Research Foundation of Graduate School of Southeast University (YBPY2016) and the China Scholarship Council. We would like to thank the anonymous reviewers for their helpful remarks.

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Correspondence to Jianguo Cai.

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The authors declare that they have no conflict of interest.

Replication of results

The MATLAB codes of the proposed methods are available upon request to the first and corresponding authors.

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Responsible Editor: Seonho Cho

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Zhang, Q., Jia, W., Lee, D.Sh. et al. Inverse design of planar morphing scissor structures with end constraints. Struct Multidisc Optim 65, 70 (2022). https://doi.org/10.1007/s00158-022-03175-3

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  • DOI: https://doi.org/10.1007/s00158-022-03175-3

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