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Shape Memory
Technology SFB 459
Special Research Center funded by German Research
Foundation  |
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| General information on project B6 |
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| Subject: |
| Activation behaviour of SMA-wires for
the application in a miniaturised drive
system |
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| Field of investigation: |
| Mechanical engineering, production
engineering, microengineering |
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| Principal Investigator: |
| Prof. Dr.-Ing. Horst Meier |
| Telephone (0234) 32-26308 |
| FAX (0234) 32-14157 |
| email: meier@lps.ruhr-uni-bochum.de
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| web: http://www.lps.ruhr-uni-bochum.de |
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| Address: |
Ruhr-Universität Bochum
Fakultät für Maschinenbau
Institut für Automatisierungstechnik
Lehrstuhl für Produktionssysteme
Universitätsstr. 150
44780 Bochum |
| Summary/Abstract |
The dynamic properties of actuators
composed of shape memory alloys (SMA) are
characterized by the rate of heating and
cooling procedures. Today this process
can only be described insufficiently for
different boundary conditions like
actuator geometry and load conditions.
However basic knowledge about the time
response of SMA represents an important
fundament for the characterization of the
attainable dynamic of SMA actuators and
has thereby crucial influence on their
industrial usability.
Aim of the first part of the project is
the experimental and theoretical analysis
of the dynamic behaviour of SMA-wire
actuator's during the transformation from
martensite to austenite and vice versa.
For the investigation of the actuators
performance the SMA-wire is provided with
different load conditions by an exterior
mechanical system while the influence on
the dynamic behaviour during heating and
cooling phase is analysed. The heating of
the SMA-wire actuator results from the
use of Ohm's resistance, whereby
different constant and time variable
profiles of electric current are examined.
Apart from this experimental
investigation a numerical analysis of
energy fluxes is executed, to display
graphically the time-response of SMA-wires
depending on their geometry (diameter,
length), the load conditions and a
possibly time variant heating current.
Based on the results of this fundamental
work a demonstrator will be designed,
which uses and demonstrates the specific
properties of SMA. Aim of this task is
the development of a rotatory drive
system that is based on a mechanical
system with two circular bodies with
different circumferences of which one is
shifting within the other in a rotatory
motion free from slippage (Harmonic Drive-principle)
and powered by SMA-wire actuators.
Special features of this motor are a high
torque density and a high positioning
accuracy. |
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