In this paper measurement of vibrations on a test case, a simple typical bending beam on an electro dynamical exciter, are performed by using a high resolution and sufficiently fast thermocamera. Excitation of the beam has been performed by band-limited noise and response is measured in terms of temperature time history on its surface by the recorded thermal film. Temperature time evolution on the beam surface is also related to stress time evolution according to the thermoelastic principle. By developing a special data processing software of the thermal film the possibility to get the operational deflection mode shapes of the beam is clearly demonstrated. The possibility to measure a new proposed transfer function named stressance (ratio between exciting force and resulting stress) on the different point of the beam surface is proposed.
Thermoelastic modal stress analyis
MARSILI, Roberto;MORETTI, MICHELE;ROSSI, Gianluca
2008
Abstract
In this paper measurement of vibrations on a test case, a simple typical bending beam on an electro dynamical exciter, are performed by using a high resolution and sufficiently fast thermocamera. Excitation of the beam has been performed by band-limited noise and response is measured in terms of temperature time history on its surface by the recorded thermal film. Temperature time evolution on the beam surface is also related to stress time evolution according to the thermoelastic principle. By developing a special data processing software of the thermal film the possibility to get the operational deflection mode shapes of the beam is clearly demonstrated. The possibility to measure a new proposed transfer function named stressance (ratio between exciting force and resulting stress) on the different point of the beam surface is proposed.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
