Development of precision force sensor with specified measuring range
In this report, a compliant-mechanisms-based precision force sensor has been developed. The first part of the report is devoted to the mechanism design of the force sensor. The compliant mechanism is chosen due to its nano-motion ability, compactness, ease of manufacturing, reduction in wear and lub...
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| Format: | Final Year Project |
| Language: | English |
| Published: |
2010
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| Subjects: | |
| Online Access: | http://hdl.handle.net/10356/40741 |
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| Institution: | Nanyang Technological University |
| Language: | English |
| Summary: | In this report, a compliant-mechanisms-based precision force sensor has been developed. The first part of the report is devoted to the mechanism design of the force sensor. The compliant mechanism is chosen due to its nano-motion ability, compactness, ease of manufacturing, reduction in wear and lubrication, etc. In order to improve the sensor’s accuracy, high linearity of stiffness is preferred. As a result, compound linear spring mechanism based on the compliant structure is investigated and used as it exhibits high linear stiffness properties. The second effort has been made to establish the analytical model for the flexible beam in the compliant structure to investigate the linearity of beam’s stiffness. The analytical model is built based on the method of elliptic integral. Numerical model based on the finite element method has also been carried out to analyze the linearity of flexible beam’s stiffness since it is much easier to use and can handle more complex situations compared to the analytical model.
Based on the analytical and numerical model, a comprehensive parametrical study has been carried out. Optimization of the design is performed according to the
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results of the study. The third part of the report is designing a magnetic damper to control the vibration of the force sensor. As even nano-motion of the compliant structure in the force sensor can be captured by our optical reading head, vibration noise outside is very destructive to the performance during force measurement. The proper magnet is selected based on the calculation to get a suitable damping coefficient. In the final part of the report, experiments are carried out to verify the previous analysis and to evaluate the performance of the sensor. Software is designed to collect and show the measurement data. At the same time, different software compensation methods are used to increase the precision of the force sensor. |
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