Ring-Based Stiffening Flexure Applied as a Load Cell With High Resolution and Large Force Range
This paper applies linear elastic theory and Castigliano's first theorem to design nonlinear (stiffening) flexures used as load cells with both large force range and large resolution. Low stiffness at small forces causes high sensitivity, while high stiffness at large forces prevents over-strai...
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| Other Authors: | |
| Format: | Article |
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ASME International
2018
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| Online Access: | http://hdl.handle.net/1721.1/119789 https://orcid.org/0000-0002-5048-4109 https://orcid.org/0000-0003-0302-0691 |
| _version_ | 1811069775653109760 |
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| author | Kluger, Jocelyn Maxine Slocum, Alexander H Sapsis, Themistoklis P. |
| author2 | Massachusetts Institute of Technology. Department of Mechanical Engineering |
| author_facet | Massachusetts Institute of Technology. Department of Mechanical Engineering Kluger, Jocelyn Maxine Slocum, Alexander H Sapsis, Themistoklis P. |
| author_sort | Kluger, Jocelyn Maxine |
| collection | MIT |
| description | This paper applies linear elastic theory and Castigliano's first theorem to design nonlinear (stiffening) flexures used as load cells with both large force range and large resolution. Low stiffness at small forces causes high sensitivity, while high stiffness at large forces prevents over-straining. With a standard 0.1 lm deflection sensor, the nonlinear load cell may detect 1% changes in force over five orders of force magnitude. In comparison, a traditional linear load cell functions over only three orders of magnitude. We physically implement the nonlinear flexure as a ring that increasingly contacts rigid surfaces with carefully chosen curvatures as more force is applied. We analytically describe the load cell performance as a function of its geometry. We describe methods for manufacturing the flexure from a monolithic part or multiple parts. We experimentally verify the theory for two load cells with different parameters. |
| first_indexed | 2024-09-23T08:15:57Z |
| format | Article |
| id | mit-1721.1/119789 |
| institution | Massachusetts Institute of Technology |
| last_indexed | 2024-09-23T08:15:57Z |
| publishDate | 2018 |
| publisher | ASME International |
| record_format | dspace |
| spelling | mit-1721.1/1197892024-06-27T14:42:00Z Ring-Based Stiffening Flexure Applied as a Load Cell With High Resolution and Large Force Range Kluger, Jocelyn Maxine Slocum, Alexander H Sapsis, Themistoklis P. Massachusetts Institute of Technology. Department of Mechanical Engineering Massachusetts Institute of Technology. Department of Ocean Engineering Kluger, Jocelyn Maxine Slocum, Alexander H Sapsis, Themistoklis P. This paper applies linear elastic theory and Castigliano's first theorem to design nonlinear (stiffening) flexures used as load cells with both large force range and large resolution. Low stiffness at small forces causes high sensitivity, while high stiffness at large forces prevents over-straining. With a standard 0.1 lm deflection sensor, the nonlinear load cell may detect 1% changes in force over five orders of force magnitude. In comparison, a traditional linear load cell functions over only three orders of magnitude. We physically implement the nonlinear flexure as a ring that increasingly contacts rigid surfaces with carefully chosen curvatures as more force is applied. We analytically describe the load cell performance as a function of its geometry. We describe methods for manufacturing the flexure from a monolithic part or multiple parts. We experimentally verify the theory for two load cells with different parameters. 2018-12-20T14:30:51Z 2018-12-20T14:30:51Z 2017-06 2018-12-18T16:00:59Z Article http://purl.org/eprint/type/JournalArticle 1050-0472 http://hdl.handle.net/1721.1/119789 Kluger, Jocelyn M., Alexander H. Slocum, and Themistoklis P. Sapsis. “Ring-Based Stiffening Flexure Applied as a Load Cell With High Resolution and Large Force Range.” Journal of Mechanical Design 139, no. 10 (August 30, 2017): 103501. © 2017 by ASME https://orcid.org/0000-0002-5048-4109 https://orcid.org/0000-0003-0302-0691 http://dx.doi.org/10.1115/1.4037243 Journal of Mechanical Design Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. application/pdf ASME International ASME |
| spellingShingle | Kluger, Jocelyn Maxine Slocum, Alexander H Sapsis, Themistoklis P. Ring-Based Stiffening Flexure Applied as a Load Cell With High Resolution and Large Force Range |
| title | Ring-Based Stiffening Flexure Applied as a Load Cell With High Resolution and Large Force Range |
| title_full | Ring-Based Stiffening Flexure Applied as a Load Cell With High Resolution and Large Force Range |
| title_fullStr | Ring-Based Stiffening Flexure Applied as a Load Cell With High Resolution and Large Force Range |
| title_full_unstemmed | Ring-Based Stiffening Flexure Applied as a Load Cell With High Resolution and Large Force Range |
| title_short | Ring-Based Stiffening Flexure Applied as a Load Cell With High Resolution and Large Force Range |
| title_sort | ring based stiffening flexure applied as a load cell with high resolution and large force range |
| url | http://hdl.handle.net/1721.1/119789 https://orcid.org/0000-0002-5048-4109 https://orcid.org/0000-0003-0302-0691 |
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