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REALIZATION OF A PROTOTYPE REALIZATION OF A PROTOTYPE OF MONODIMENSIONAL SHAKING TABLE

Politecnico di Torino – Sede di Alessandria

Student: Testa Claudio

Acknowledgments

• Eng Franchini Fausto
• Eng. Franchini Fausto
• Eng. Pallavicini Enrico

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 future developed in the future

Multi task of the shaking table

• Simulate an earthquake on a structure, or

a b ilding a building

• Simulate an earthquake on a bridge
• Execute “hybrid” test

Test on a structure

d l Model Linear guide Model table Electrical engines Frame Frame

Test on a bridge

Model Electrical motor Model table 1 Model table 2 Electrical motor Mounting holes allow for mounitng different model sizes

“Hybrid” test

Vertical position of engine can be adjusted Model Model table is locked in place

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.

Phases of production of the machine

Painting and assembling

Electrical drive

2 linear electrical engines PS 01 48x240‐C of LinMOT. g Max force: 585 N Max force: 585 N Max stroke: 330 mm Max speed: 1,7 m/s

Stator Motor axle Motor support

Control panel

Emergency button Start button

Control panel

Power supply Engine controls Power supply Power supply for engine t l Engine controls control National Accelerometer Instruments Converters data acquisition Electrical devices protection

Position sensor

M d l bl M ti d i Model table Magnetic drive Position sensor Sensor support

Different methods for testing

Parallel electrical drive Single electrical drive

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 th

• 2. 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
• f 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 development

D l th t t ith th l f i l ti l Develop 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 earthquake earthquake

Thank you y