Multi-blade monolithic Euler springs with optimised stress distribution

J.V. van Heijningen; J. Winterflood; B. Wu; L. Ju

doi:10.1016/j.jsv.2023.117614

Multi-blade monolithic Euler springs with optimised stress distribution

J.V. van Heijningen, J. Winterflood, B. Wu, L. Ju

Research output: Contribution to Journal › Article › Academic › peer-review

Abstract

Euler springs are used for vertical suspension and vibration isolation as they provide a large static supporting force with a low spring-rate and use minimal spring material. To date, multiple single-width rectangular blades of uniform thickness and stacked flat-face to flat-face have been used in the post buckled state, with half of the blades buckling in each of opposing directions. For ultra-low-noise isolation the ends need to be clamped which results in stick–slip issues at the joints. In this study we investigate the benefits of forming side-by-side oppositely buckling blades from a single monolithic sheet of spring material. Additionally, we study how to distribute the stress evenly along the length of the blade by contouring its width, as well as finding the optimal contour to distribute the stress evenly around the tearing joints between oppositely bending blade sections. We show that this optimal shaping typically improves the inconveniently small spring working range by over 60% compared to an equivalent rectangular blade.

Original language	English
Article number	117614
Journal	Journal of Sound and Vibration
Volume	552
DOIs	https://doi.org/10.1016/j.jsv.2023.117614
Publication status	Published - 26 May 2023
Externally published	Yes

Funding

This work was funded by the Australian Research Council (ARC) Centre of Excellence for Gravitational Wave Discovery (OzGrav) under grant CE170100004. We would like to thank Andrew Sunderland, Alessandro Bertolini, David Blair, Bram Slagmolen and Joshua McCann for useful discussions and comments. Additionally, we would like to acknowledge contributions from students Lindsay Wood and Wenjing Zheng early on. The authors also wish to thank the workshop technicians Ken Field and Steve Key. This work was funded by the Australian Research Council (ARC) Centre of Excellence for Gravitational Wave Discovery (OzGrav) under grant CE170100004 . We would like to thank Andrew Sunderland, Alessandro Bertolini, David Blair, Bram Slagmolen and Joshua McCann for useful discussions and comments. Additionally, we would like to acknowledge contributions from students Lindsay Wood and Wenjing Zheng early on. The authors also wish to thank the workshop technicians Ken Field and Steve Key.

Funders	Funder number
Alessandro Bertolini
Andrew Sunderland
Australian Research Council	CE170100004

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title = "Multi-blade monolithic Euler springs with optimised stress distribution",

abstract = "Euler springs are used for vertical suspension and vibration isolation as they provide a large static supporting force with a low spring-rate and use minimal spring material. To date, multiple single-width rectangular blades of uniform thickness and stacked flat-face to flat-face have been used in the post buckled state, with half of the blades buckling in each of opposing directions. For ultra-low-noise isolation the ends need to be clamped which results in stick–slip issues at the joints. In this study we investigate the benefits of forming side-by-side oppositely buckling blades from a single monolithic sheet of spring material. Additionally, we study how to distribute the stress evenly along the length of the blade by contouring its width, as well as finding the optimal contour to distribute the stress evenly around the tearing joints between oppositely bending blade sections. We show that this optimal shaping typically improves the inconveniently small spring working range by over 60% compared to an equivalent rectangular blade.",

author = "{van Heijningen}, J.V. and J. Winterflood and B. Wu and L. Ju",

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AU - Wu, B.

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N2 - Euler springs are used for vertical suspension and vibration isolation as they provide a large static supporting force with a low spring-rate and use minimal spring material. To date, multiple single-width rectangular blades of uniform thickness and stacked flat-face to flat-face have been used in the post buckled state, with half of the blades buckling in each of opposing directions. For ultra-low-noise isolation the ends need to be clamped which results in stick–slip issues at the joints. In this study we investigate the benefits of forming side-by-side oppositely buckling blades from a single monolithic sheet of spring material. Additionally, we study how to distribute the stress evenly along the length of the blade by contouring its width, as well as finding the optimal contour to distribute the stress evenly around the tearing joints between oppositely bending blade sections. We show that this optimal shaping typically improves the inconveniently small spring working range by over 60% compared to an equivalent rectangular blade.

AB - Euler springs are used for vertical suspension and vibration isolation as they provide a large static supporting force with a low spring-rate and use minimal spring material. To date, multiple single-width rectangular blades of uniform thickness and stacked flat-face to flat-face have been used in the post buckled state, with half of the blades buckling in each of opposing directions. For ultra-low-noise isolation the ends need to be clamped which results in stick–slip issues at the joints. In this study we investigate the benefits of forming side-by-side oppositely buckling blades from a single monolithic sheet of spring material. Additionally, we study how to distribute the stress evenly along the length of the blade by contouring its width, as well as finding the optimal contour to distribute the stress evenly around the tearing joints between oppositely bending blade sections. We show that this optimal shaping typically improves the inconveniently small spring working range by over 60% compared to an equivalent rectangular blade.

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Multi-blade monolithic Euler springs with optimised stress distribution

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