Research ambitions in experimental mechanics Department of Applied - - PowerPoint PPT Presentation
Research ambitions in experimental mechanics Department of Applied Physics and Mechanical Engineering Division of Experimental Mechanics Chair: Professor Mikael Sjdahl, mikael.sjodahl@ltu.se Research areas Applications Physically based
Research ambitions in experimental mechanics
Department of Applied Physics and Mechanical Engineering Division of Experimental Mechanics Chair: Professor Mikael Sjödahl, mikael.sjodahl@ltu.se
Research areas
Applications Physically based estimation Robust field information extraction 3D and 4D metrology Other methods
Research area: 3D and 4D metrology
Research challenge: how to fill the (k,ω) space to reach a sufficient resolution and reliability in (x,t) space without being prone to environmental disturbances
Phase objects (1)
Quantitative laser ablation, 835 ns after interaction
Challenges: mapping
( ) ( ) ( )
ω ω ω , , , ˆ x x x ik n n + =
Tools:
Contact Per Gren and Eynas Amer for more information
Particles (2) Laser
Particle distance > Airy spot size Challenges:
Tool: Digital holography
Multiple scattering objects / imaging w ithin opaque objects (3)
Tools:
Contact Erik Olsson for more information
Surfaces / 2.5D (4)
Challenges:
Methods:
Contact Sara Rosendahl and Emil Hällstig for more information
Research area: Robust field information extraction
Research challenge: set up a general framework in which distributed optical complex signals may be analysed in a robust way without deteriorating the resolution in the signals acquired
”FEM” – approach 1, 2 , 3 D
Example 1D deformation
200 400 600 800 1000 1200
0.5 1 1.5 2 Piecewise Chebyshev polynomials, marked interval centres Position [pixels] Displacement [pixels] 200 400 600 800 1000 1200
0.5 1 1.5 2 Estimated piecewise Chebyshev polynomials, marked interval centres Position [pixels] Displacement [pixels]
200 400 600 800 1000 1200 Separating medium and information Digital filter
Reference noise Measured phase Plate variation Noise
Contact Henrik Lycksam for more information!!!!
Research area: Physically based estimation
Research challenge: How to combine observables with verified physical relations to
Tools:
Example: Laser ablation – point explosion model
Contact Per Gren and Eynas Amer for more information
Example: Friction estimation
The plot to the left shows a comparison between estimated road friction based on a forward looking
friction. Contact Johan Casselgren for more information
Automatic comparison betw een CAD model and measurement
surface defects, angles, … Contact Sara Rosendahl for more information