Nonlinear analysis of a class of inversion-based compliant cross-spring pivots

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Nonlinear analysis of a class of inversion-based compliant cross-spring pivots

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Li S. / Hao G. / Chen Y. / Zhu J. / Berselli G.

This paper presents a nonlinear model of an inversion-based generalized cross-spring pivot (IG-CSP) using the beam constraint model (BCM), which can be employed for the geometric error analysis and the characteristic analysis of an inversion-based symmetric cross-spring pivot (IS-CSP). The load-dependent effects are classified in two ways, including structure load-dependent effects and beam load-dependent effects, where the loading positions, geometric parameters of elastic flexures, and axial forces are the main contributing factors. The closed-form load-rotation relations of an IS-CSP and a non-inversion-based symmetric cross-spring pivot (NIS-CSP) are derived with consideration of the three contributing factors for analyzing the load-dependent effects. The load-dependent effects of IS-CSP and NIS-CSP are compared when the loading position is fixed. The rotational stiffness of the IS-CSP or NIS-CSP can be designed to increase, decrease, or remain constant with axial forces, by regulating the balance between the loading positions and the geometric parameters. The closed-form solution of the center shift of an IS-CSP is derived. The effects of axial forces on the IS-CSP center shift are analyzed and compared with those of a NIS-CSP. Finally, based on the nonlinear analysis results of IS-CSP and NIS-CSP, two new compound symmetric cross-spring pivots are presented and analyzed via analytical and FEA models.

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Dokumentinformationen

Titel :

Nonlinear analysis of a class of inversion-based compliant cross-spring pivots

Beteiligte:

Li S. (Autor:in) / Hao G. (Autor:in) / Chen Y. (Autor:in) / Zhu J. (Autor:in) / Berselli G. (Autor:in) / Li, S. / Hao, G. / Chen, Y. / Zhu, J. / Berselli, G.

Erscheinungsdatum :

2021-01-01

DOI :

https://doi.org/10.1115/DETC2021-69028

Medientyp :

Aufsatz (Konferenz)

Format :

Elektronische Ressource

Sprache :

Englisch

Schlagwörter :

Center shift , Compliant cross-spring pivot , Load-dependent effect , Loading position , Nonlinear analysis