1. ANOTHER WAY OF UNDERSTANDING THE PHYSICAL BASIS OF THE
ELASTICITY OF A BODY IN MOTION
Until now, when we wanted to measure the elasticity of a body (bending-torsion) we could do so only by
taking fixed or stationary points as reference of measurement; in other words, we took the Earth
(terrestrial soil) as reference of measurement through specific points of support.
The simplest way is to take two points of support such as in Fig. 1, where the base of the supports is the
terrestrial ground or an extension of this (by e.g.: a table or high points of support). In the case of Fig. 2 we
only take one point of support which would correspond to a cantilever structure or a beam recessed into
wall.
= point of support
Terrestrial Soil
Rotation Angle
Fig. 2
However such supports are not fixed since the Earth is not stationary in space. Up today we are told that
Earth has 5 movements, where the best known and important are the rotation and translation. Therefore,
the Earth in its movement of translation in space moves just like any aircraft in flight within the Earth's
atmosphere or as a spaceship out of the atmosphere; so, any aircraft’s point can be considered a fixed or
support point as reference for its structural elasticity measurement.
Given the above, the Fig. 1 and 2 demonstrate that two SEMS sensors are sufficient for the elasticity
measuring of an aerial structure in its movement, as for example: the wing of an aircraft according to Fig. 3
next.
SEMS sensor SEMS sensor
Likewise happen with the movement of any vessel, vehicle or body, since the action of gravity is always
present regardless of the medium used for moving: air, water or ground.
Miguel Cabral Martín
Fig. 3
Wall
Beam or Structure
Load
Fig. 1