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Description
The ever-increasing specifications on the structural stability in some scientific or
engineering applications has led to the design of a generic, six degrees of freedom
active interface.
The Active Damping & Steering Interface consists of a stiff active six degree-of-freedom
hexapod (Stewart platform with cubic architecture). Each leg consists of a linear
piezoelectric actuator, a collocated force sensor and flexible tips for the connection to the
base plates.
The hexapod can be used as damping interface connecting arbitrary structures,
microvibration isolator, or high precision pointing mechanism. Optionally, the legs can be
provided with strain or elongation sensors, so that the hexapod can be used as an interface
with infinite stiffness at low frequency.
The maximum axial stroke is 90µm and the maximum tilt is 0.4 mrad.
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Main Advantages
The simple and compact design provides:
- 6 Degree-Of-Freedom
- Uniformity of control capability in all directions
- High resolution force sensors
- Programmable stiffness in all directions
- Simple kinematic and dynamic analysis
- High guiding precision and zero backlash
- Easy integration of custom configurations and requirements
- Low voltage piezoelectric actuators
Applications
Interferometry
Optical delay lines, fast steering mirrors
Electronic industry
High accuracy, high stiffness positioning device
Robotics
Active damping of flexible appendages
Machine Tools
Cutting or clamping tool stabilization
Optics
Vibration Isolation
Publications
Generic Active
Damping and Pointing Interface based on a Steward Platform
(Ir. A. Abu Hanied, Prof. A. Preumont - Université
Libre de Bruxelles)
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Specifications
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Size :
Weight : 3 Kg
Stroke :
- Tx: 60 µm - Rx: 0.4 mrad
- Ty: 60 µm - Ry: 0.4 mrad
- Tz: 90 µm - Rz: 0.3 mrad
Resolution :
- Translation: 5 nmrms
- Rotation: 70 nradrms
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Maximum load : 100N / 4Nm
Force resolution : 0.1mNrms
Bandwidth : 200Hz
Stiffness :
- Translation: 1.5N/ mm
- Rotation: 10Nm/mrad
Inputs : 6 x 0/10V or –5/+5V
Outputs : 6 x –10/+10V
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The control unit includes 6 low noise charge amplifiers, 6 voltage
amplifiers for the piezoelectric actuation, as well as connections
for control electronics.
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