Whenever the vehicle is allowed to pass over the dome, it gets pressed downwards. As the springs are attached to the dome, they get compressed and the rack, which is attached to, the bottom of the dome moves down in the reciprocating motion. Since rack has teeth connected to gear there is a conversion of the reciprocating motion of rack into rotary motion of gears, but the two gears rotate in opposite direction. So that shafts will rotate with certain RPM these shafts are connected through a chain drive to the stepper motor, which converts the mechanical energy into electrical energy.
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