2026-09-19T21:26:02Zhttps://dspace.mit.edu/server/oai/requestoai:dspace.mit.edu:1721.1/989522022-01-13T07:54:05Zcom_1721.1_7582com_1721.1_7581col_1721.1_131024
Martin L. Culpepper.
Barraza, Raul
Massachusetts Institute of Technology. Department of Mechanical Engineering.
Massachusetts Institute of Technology. Department of Mechanical Engineering
2015-09-29T18:55:08Z
2015-09-29T18:55:08Z
2015
2015
http://hdl.handle.net/1721.1/98952
921147486
Thesis: S.B., Massachusetts Institute of Technology, Department of Mechanical Engineering, 2015.
Cataloged from PDF version of thesis.
Includes bibliographical references (page 49).
Ultramicrotomy is the process of cutting specimens into submicron-thickness slices for subsequent imaging using a scanning electron microscope (SEM). Ultramicrotomes, devices that employ this process, have incorporated oscillations into this process to reduce the damage done on each slice. Extensive research has been made in trying to identify the appropriate settings: frequency, amplitude of cut, and feed speed, to maximize the reduction of this damage. Currently, however, there exists no research that tries to understand why the introduction of oscillations provides such a reduction in damage. To understand the mechanics behind oscillatory orthogonal cutting, specifically in ultramicrotomy, the frequency response of a compliant mechanism must be understood. The frequency response of a complaint flexural stage driven by piezoelectric actuator was measured. Using a Linear Variable Differential Transformer (LVDT) and a dynamic signal analyzer via LabView, the frequency response of the stage was measured from 100Hz to 10000Hz. A model was then fitted to the measured response. Using this model, a comparison between a simulated-reference response of the position of the stage to the output response of the model showed that a controller was required to minimize the error in the position of the stage.
by Raul Barraza.
S.B.
49 pages
eng
Massachusetts Institute of Technology
M.I.T. theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission. See provided URL for inquiries about permission.
http://dspace.mit.edu/handle/1721.1/7582
Mechanical Engineering.
Understanding frequency response of a flexural complaint stage for use in oscillatory orthogonal cutting
Thesis
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<Abstract>Ultramicrotomy is the process of cutting specimens into submicron-thickness slices for subsequent imaging using a scanning electron microscope (SEM). Ultramicrotomes, devices that employ this process, have incorporated oscillations into this process to reduce the damage done on each slice. Extensive research has been made in trying to identify the appropriate settings: frequency, amplitude of cut, and feed speed, to maximize the reduction of this damage. Currently, however, there exists no research that tries to understand why the introduction of oscillations provides such a reduction in damage. To understand the mechanics behind oscillatory orthogonal cutting, specifically in ultramicrotomy, the frequency response of a compliant mechanism must be understood. The frequency response of a complaint flexural stage driven by piezoelectric actuator was measured. Using a Linear Variable Differential Transformer (LVDT) and a dynamic signal analyzer via LabView, the frequency response of the stage was measured from 100Hz to 10000Hz. A model was then fitted to the measured response. Using this model, a comparison between a simulated-reference response of the position of the stage to the output response of the model showed that a controller was required to minimize the error in the position of the stage.</Abstract>
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