Method and apparatus for measuring the load bearing capacity of a platform
First Claim
1. Method for continuously measuring the stiffness of a transport infrastructure road level and industrial floors, wherein it comprises the following steps of:
- rolling on the road level a wheel of mass Mr suspended beneath a chassis of mass Mc, subjecting the wheel to vertical vibrations by means of an unbalanced member rotating about the axis of the wheel and subjected to a centrifugal force Fc, measuring as a function of time the vertical acceleration Gr of the wheel and the vertical acceleration Gc of the chassis by means of acceleration sensors mounted on the wheel and on the chassis, measuring as a function of time the angular phase φ
between the direction of the centrifugal force Fc of the unbalanced member and the vertical by means of a sensor, calculating as a function of time the vertical component FTA of the force applied by the wheel on the road level, calculating as a function of time the vertical deformation d undergone by the road level from the measurement of the vertical acceleration Gr of the wheel, establishing for each cycle of vibration the loop of the vertical component FTA with respect to the deformation d, calculating at each cycle of vibration the gradient of the loop in the branch of the ascending vertical components in order to obtain the stiffness of the road level.
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Accused Products
Abstract
The invention relates to a method and an apparatus for measuring the lift of a transport infrastructure road level and industrial floors. The apparatus comprises a wheel borne by a chassis pivotally mounted on a trailer towed by a vehicle. An unbalanced member causes the wheel to vibrate. The vertical acceleration of the chassis and of the wheel and the angle of the centrifugal force of the unbalanced member with the vertical, are continuously measured. The total force applied by the wheel, the chassis and the unbalanced member is calculated from the measurements of the accelerations, as is the deflection of the road level by double integration of the acceleration of the wheel.
19 Citations
9 Claims
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1. Method for continuously measuring the stiffness of a transport infrastructure road level and industrial floors, wherein it comprises the following steps of:
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rolling on the road level a wheel of mass Mr suspended beneath a chassis of mass Mc, subjecting the wheel to vertical vibrations by means of an unbalanced member rotating about the axis of the wheel and subjected to a centrifugal force Fc, measuring as a function of time the vertical acceleration Gr of the wheel and the vertical acceleration Gc of the chassis by means of acceleration sensors mounted on the wheel and on the chassis, measuring as a function of time the angular phase φ
between the direction of the centrifugal force Fc of the unbalanced member and the vertical by means of a sensor,calculating as a function of time the vertical component FTA of the force applied by the wheel on the road level, calculating as a function of time the vertical deformation d undergone by the road level from the measurement of the vertical acceleration Gr of the wheel, establishing for each cycle of vibration the loop of the vertical component FTA with respect to the deformation d, calculating at each cycle of vibration the gradient of the loop in the branch of the ascending vertical components in order to obtain the stiffness of the road level. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
a towable trailer resting on wheels for rolling over the ground, a chassis of mass Mc mounted on the trailer so as to be able to pivot about a transverse axle, a wheel of mass Mr equipped with an unbalanced member and suspended beneath the chassis, means for rotating the unbalanced member, a first acceleration sensor mounted on the chassis, a second acceleration sensor mounted on the wheel, a sensor detecting the angle of the unbalanced member, means for calculating the vertical deformation undergone by the road level, as a function of time, means for establishing, upon each cycle of vibration, the loop of the vertical component with respect to the deformation, and means for calculating the stiffness of the road level upon each cycle of vibration.
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Specification