Identification of real translational and rotational displacements of six-axial shakers with only six measured linear accelerations

Qualification tests on the vibrations of on-board equipment depend ability shaker used to reproduce as precisely possible excitation profiles stipulated by standards, given that real operational conditions are generally multiaxial. Using a set six measured linear accelerations original method proposed permits determining six-axial displacements combining three translations and rotations. Thus, this method, named REDEAT (REal Displacement from Experimental Acceleration with inverse Technique), is useful for introducing these in numerical simulation view experimentally validating dynamic behavior model equipment. Moreover, evaluates deviation between intended forced displacements. Its principle resides solving system nonlinear time-differential equations expressed, resorting integration Newmark Newton–Raphson schemes. In order overcome classical divergence issue inherent use integration, data processing tools employed, consisting application successive high pass filters window functions. The applied hydraulic 6-DOF equipped accelerometers gyroscopes, through combination two harmonic rotations full random motion. addition, influence method’s parameters input accelerograms chosen twelve investigated.