v2.01.104 SDLD104 - Extrapolation of local measurements on a complete (discrete) model#
Summary:
It is a discrete linear dynamics test.
The aim is to test command PROJ_MESU_MODAL in the case of a discrete system. This command makes it possible to project experimental dynamic transient responses at a certain number of points on a modal basis of numerical modeling.
This test contains 2 models where the projection is based on a concept such as [mode_meca], the difference being given by the way in which this concept is manufactured.
For the 2 models, the experimental measurements provided are identical and make it possible to test the search for nodes facing each other, the taking into account a local orientation and the treatment of a sampling in constant time or not, for measurements while moving.
In both cases, the reference solution is determined analytically (by Maple); the projection is carried out in the favorable configuration where the number of modes is equal to the number of measurements.
The displacement responses obtained after projection are identical to the reference movements provided in data.
The values of the speeds and accelerations deduced from the displacements obtained after projection are close to those obtained analytically. The slight differences observed are due to the approximation errors caused by the determination of velocities and accelerations via a linear time diagram.