Topology optimization of stiffness constrained flexure-hinges for precision and range maximization
•Flexure-hinges, a commonly used compliant design element are optimized.•Investigation of precision-based cost function for use within topology optimization.•Characterisation of hinges with respect to motion range, stress and precision.•Novel hinges designed, which enhance range when subject to prec...
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| Published in | Mechanism and machine theory Vol. 150; p. 103874 |
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| Main Authors | , , , , , |
| Format | Journal Article |
| Language | English |
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01.08.2020
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| Abstract | •Flexure-hinges, a commonly used compliant design element are optimized.•Investigation of precision-based cost function for use within topology optimization.•Characterisation of hinges with respect to motion range, stress and precision.•Novel hinges designed, which enhance range when subject to precision restrictions.
Compliant hinges are one of the most widely used design elements in precision mechanism design. They enable higher precision rotation than multi-part hinges and facilitate the adaptation of macro-scale parallel mechanisms into micro-scale. Existing hinge designs offer either a large range at the expense of rotational accuracy or attempt to produce accuracy at the expense of range and stiffness. This paper investigates novel hinge structures which increases range, stiffness and precision and characterises the trade-off between the parameters. A computational topology optimization methodology is developed, and the effects of varying geometry and orientation investigated. Two novel hinges are proposed based on the results, which can be employed in heuristic mechanism designs and their enhanced performance demonstrated in a 3-PRR positioning mechanism. |
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| AbstractList | •Flexure-hinges, a commonly used compliant design element are optimized.•Investigation of precision-based cost function for use within topology optimization.•Characterisation of hinges with respect to motion range, stress and precision.•Novel hinges designed, which enhance range when subject to precision restrictions.
Compliant hinges are one of the most widely used design elements in precision mechanism design. They enable higher precision rotation than multi-part hinges and facilitate the adaptation of macro-scale parallel mechanisms into micro-scale. Existing hinge designs offer either a large range at the expense of rotational accuracy or attempt to produce accuracy at the expense of range and stiffness. This paper investigates novel hinge structures which increases range, stiffness and precision and characterises the trade-off between the parameters. A computational topology optimization methodology is developed, and the effects of varying geometry and orientation investigated. Two novel hinges are proposed based on the results, which can be employed in heuristic mechanism designs and their enhanced performance demonstrated in a 3-PRR positioning mechanism. |
| ArticleNumber | 103874 |
| Author | Shirinzadeh, Bijan Nowell, Rohan Ghafarian, Mohammadali Pinskier, Joshua Das, Tilok Kumar Al-Jodah, Ammar |
| Author_xml | – sequence: 1 givenname: Joshua orcidid: 0000-0002-8878-9012 surname: Pinskier fullname: Pinskier, Joshua email: joshua.pinskier@monash.edu – sequence: 2 givenname: Bijan surname: Shirinzadeh fullname: Shirinzadeh, Bijan – sequence: 3 givenname: Mohammadali orcidid: 0000-0003-4649-650X surname: Ghafarian fullname: Ghafarian, Mohammadali – sequence: 4 givenname: Tilok Kumar surname: Das fullname: Das, Tilok Kumar – sequence: 5 givenname: Ammar orcidid: 0000-0003-4536-1240 surname: Al-Jodah fullname: Al-Jodah, Ammar – sequence: 6 givenname: Rohan surname: Nowell fullname: Nowell, Rohan |
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