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  • 1
    Electronic Resource
    Electronic Resource
    Shape Control of a FRP Airfoil Structure Using SMA-Actuators and Optical Fiber Sensors (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 144 (Sept. 2008), p. 196-201 
    Details
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Notes: The aim of this work was to design a control system for the shape memory alloy (SMA)actuator operated airfoil (a cross section of wind turbine blade). Design of SMA control is focusedon the reliable operation of the SMA actuators. The actuator should follow the targeted shapeaccurately and without too much delay. Another objective is to avoid overheating which is the mostcritical damage to the structure. SMA actuator shape control is in principle possible to do with anyposition control method, but the specific properties of the SMA actuators, like the hysteresis, thefirst cycle effect and the long term changes, need to be taken into account.In this work, a wing profile prototype was measured using optical fiber sensors and traditionalstrain gauges. Also, external laser sensors were used to measure displacements of upper/lowersurface and trailing edge. Shape change was obtained by embedding SMA wire actuators into fiberreinforced polymer (FRP) composite structure. SMA actuators were laminated in such way thatbending of trailing edge is always downwards. Actuators are activated with Joule heating and thetemperature is measured with integrated thermocouples and optical fiber temperature sensors.As a result, this work gave information about the usability of optical fibers sensors in active FRPcomposite structures. Measurements also give information about the efficiency of SMA actuators inshape control of relatively stiff FRP structures
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/24/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.144.196.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Enhancing the Accuracy of MRI-Compatible Robots with an Optical Tracking System (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 144 (Sept. 2008), p. 191-195 
    Details
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Notes: Magnetic resonance imaging (MRI) is currently a widely used technology for obtaining athree-dimensional image of a patient’s internal structures. This study examines the measurementproperties of an optical tracking system utilised in the MRI room. The results were used to assessthe suitability of the device to be used as a part of the control system of a surgical robot. Theposition and orientation of the instrument, MRI scanner and the patient are measured using anoptical tracking system in the MRI room. The measurement data can be used to display theinstrument used as a part of the image of the patient. The optical tracking system used in the MRIroom can also be considered as a part of the control system of a robot located in the room. Whenconsidering such use, the operations of the measuring device in different measurement conditionsmust be known. In terms of robot control, it is important to know the deviation attributed tomeasurement when defining the translation vector and orientation between two trackers. Fivemeasurement series were carried out using the measurement device to examine the deviation in thetranslation vector and orientation data between two trackers. The distance and position between thetrackers were changed between the measurement series. During the measurement series, themeasurement device was moved to different distances from the trackers and the translation vectorand orientation between the trackers were defined on the basis of the measurement results obtained.The measurements showed that the deviation of the translation vector did not significantly changeas the measurement distance increased, but the deviation of orientation data between differenttrackers increased significantly. Deviation in the translation vector increased as the distancebetween trackers increased, but deviation in orientation did not change significantly
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/24/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.144.191.pdf
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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