Shaking table presentation 31-10-2014 - lecture.pdf
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Transcript of Shaking table presentation 31-10-2014 - lecture.pdf
REALIZATION OF A PROTOTYPEREALIZATION OF A PROTOTYPE OF MONODIMENSIONAL
SHAKING TABLE
Politecnico di Torino – Sede di Alessandria
Student:Testa Claudio
Project goals:
• Create a monodimensional prototype that• Create a monodimensional prototype that can replicate an earthquake
• Create a prototype that can multi task
• Create a prototype that can be further developed in the futuredeveloped in the future
Multi task of the shaking table
• Simulate an earthquake on a structure, or a b ildinga building
• Simulate an earthquake on a bridge
• Execute “hybrid” test
Test on a bridge
Model
Electrical motor
Model table 1
Model table 2
Electrical motor
Mounting holes allow for mounitng different model sizes
Phases of realization• 3D Mechanical design
External sensors
Frame standard sizes
welded reinforcing rib
• Optimization of the project wherever possible, standard components already present on the market and are cheaper.
Electrical drive2 linear electrical engines PS 01 48x240‐C of LinMOT.g
Max force: 585 NMax force: 585 NMax stroke: 330 mmMax speed: 1,7 m/s
Stator Motor axle
Motor support
Control panel Power supply Engine controlsPower supply
Power supply for engine
t l
Engine controls
control
National Accelerometer InstrumentsConverters
data acquisition
Electrical devices protection
Structure of the control
1. The accelerograms inputes the values of acceleration as a function of time with a random signal frequency (coresponding to an earthquake).
2 T i th l ti f th i ’ ti i d th2. To improve the resulotion of the engine’s motion, we increased the resulotion of the acceleration signal to 200 units per second.
3. The electrical engines are controlled by signals of position. For this reason we need to integrate the values of acceleration to obtain the equivalent values of position.
4. This value is passed to a National Instruments analogic/digital converter.4. This value is passed to a National Instruments analogic/digital converter.
5. The converter outputs a voltage value that it is proportional to the value of displacement.
6. The electrical engines read this value of voltage and moves to a coresponding displacement.
It is possible to check the real value of acceleration using accelerometers
Future developmentD l th t t ith th l f i l ti lDevelop the prototype with the goal of simulating a real earthquake in all directions (multi‐axel set up)
In the future if we use more motors we can simulate a real earthquakeearthquake