University of Twente Student Theses
Negative Stiffness Mechanism with High-Frequent Internal Dynamics for Single Axis Passive Vibration Isolation System
Asma, Batuhan (2025) Negative Stiffness Mechanism with High-Frequent Internal Dynamics for Single Axis Passive Vibration Isolation System.
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| Full Text Status: | Access to this publication is restricted |
| Embargo date: | 11 April 2040 |
| Abstract: | Vibration isolation is necessary to mitigate disturbances in machinery that have high accuracy requirements. This can be done using passive mechanical elements. This study reveals a novel leaf spring-based negative stiffness mechanism designed for high vibration isolation bandwidth purposes along a single axis. The design is based on specific requirements, primarily achieving a target negative stiffness while ensuring minimum variation in stiffness for a given operation range. Additionally, it must maintain low dynamic stiffness from saturation point, across all operating range for mechanism up to required isolation range. Geometrical properties of leaf springs with relevant boundary conditions are achieved by solving an optimization problem. The mechanism is designed, manufactured and tested to investigate its performance. To assess static performance of the mechanism, static stiffness test is carried for total operation range of the mechanism. The test reveals required nominal stiffness and variation in static stiffness. For dynamic performance, dynamic stiffness test is carried out up to a certain frequency. Dynamic stiffness test reveals internal dynamic performance of the mechanism and their effect on isolation performance for different operating positions. The proposed negative stiffness mechanism proves the feasibility of passive isolation devices that require high internal modes with low static stiffness. |
| Item Type: | Essay (Master) |
| Faculty: | ET: Engineering Technology |
| Subject: | 52 mechanical engineering |
| Programme: | Mechanical Engineering MSc (60439) |
| Link to this item: | https://purl.utwente.nl/essays/106139 |
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