REALIZATION OF A PROTOTYPE REALIZATION OF A PROTOTYPE OF - PowerPoint PPT Presentation

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 Model d l Model table Linear guide 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 Motor axle Stator Motor support

Control panel Emergency button Start button

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

Position sensor M Magnetic drive ti d i M d l Model table bl 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. To improve the resulotion of the engine’s motion, we increased the 2 T i th l ti f th i ’ ti i d th 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 development D Develop the prototype with the goal of simulating a real l th t t ith th l f i l ti l 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