Researchtopics in Structural Dynamics at...
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Vibrations and Acoustics 2019-2020 10. Research Topics
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Research topics in Structural Dynamics at ULB
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Mechanical Engineering Civil Engineering
Prof A. DeraemaekerProf C. Collette
• Develops instrumentation and strategies for actively measuring and controlling the vibrations of structures.
• Internationally renown expertise in high precision control of large instruments dedicated to experimental physics:• gravitational wave detectors• particle colliders• segmented ground and space telescopes• satellites and light sources
Prof C. ColletteProf A. Deraemaeker
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Vibrations and Acoustics 2019-2020 10. Research Topics
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Active isolation Active Damping
𝐹 Actuator
Sensor
Tools and methods
Numercialmechatronic
s models
Design and fabrication of prototypes
Vibration testing
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𝐹 Actuator
Sensor
Source of disturbance: drone
System to be stabilized: camera
Drone
CameraQuality of the images captured affected by the
vibrations from the drone
Solution: Active isolation
Image to be captured
Conventional system uses passive isolation
Passive isolation degrades the high frequency performance
Active isolation of drone cameras
[Mohit Verma]
• Single-axis isolation system (1 dof) • Multi-axis isolation system (6 dof)
Active isolation of drone cameras
[Mohit Verma]
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Active isolation in gravitational wave detectors
Gravitational waves
Principle of a gravitational wave detector
6 dofs isolation system developed
[Jennifer WatchiBinlei DingGuoying Zhang]
High precision / Low frequency sensors
Commercial sensor PML sensor
- High precision interferometer- Under vacuum (low damping)- Low resonant frequency
[Binlei Ding]
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Vibrations and Acoustics 2019-2020 10. Research Topics
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Translation/tilt gravity decoupling
laser postion detector
(laser spot motion)
laser source
Beam splitter
Tilted surface
Original reflecting surface (tilting angle)
[Binlei Ding]
• Disturbances from rotations/translations
• Active hexapod to reject disturbances
Active rejection of disturbances at a nano-metric level
[Thomas Dehaeze]
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Vibrations and Acoustics 2019-2020 10. Research Topics
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Damping of bladed structures
Light weight/low dampingVibrations -> Fatigue / noise radiation
Active vibration damping
Optimal control laws for linear systems
[Ahmad Paknejab,Guoying Zhao]
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Vibrations and Acoustics 2019-2020 10. Research Topics
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Optimal control laws for non-linear systems
[Ahmad Paknejab,Guoying Zhao]
Non-linear active control
Linear active conrol
Hybrid vibration control
[Ahmad Paknejab,Guoying Zhao]
• Failsafe• Low power consumption
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Optimisation of mechatronics systems
• Sensors and actuator types/positions ?• Control strategy ?
• Integrated mechatronics models• Robust optimisation strategies
[Shashank Pathak,Dimitri Piron]
Develops instrumentation and strategies for wave-based structural health monitoring of concrete structures and vibration damping with special emphasis on :
• Numerical modeling of piezoelectric structures• Piezoelectric transducers development• SHM data processing and decision algorithms• Design of tuned mass dampers
Prof A. Deraemaeker
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Tools and methods
Numercialmodels
Design and fabrication of prototypes
Testing
Piezoelectric module co-developed with SDTools (E. Balmès)
3D elements Multi-layer plate elements
The Structural Dynamics Toolbox (under Matlab)
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The Structural Dynamics Toolbox (under Matlab)
Complex models(1 million+ DOFS.)
Embedded piezoelectric transducers
Modeling of embedded piezoelectric transducers for concrete monitoring
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Modeling of embedded piezoelectric transducers for concrete monitoring
• Improved transducers (patent)• Development of shear wave transducers• Improvement of wave propagation models in concrete
Structural Health Monitoring
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Structural Health Monitoring
Structural Health Monitoring
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Structural Health Monitoring
Wave-based Structural Health Monitoring
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Wave-based Structural Health Monitoring
Application in the Rogier Tunnel in Brussels
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Application in the Rogier Tunnel in Brussels
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Tuned vibration absorbers
Variability due to the environment (T°, humidity)• Effect on performance of TMD ?• Robust design of TMD ?
Other criteria for optimisation• Response spectra• Realistic input spectra (wind, earthquake)
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