Operation mode analysis on a mobile phone during vibration alert



Refe­rence coor­di­na­tes and con­tour of the mobi­le phone.






This artic­le descri­bes the mea­su­re­ment and ana­ly­sis of the ope­ra­ti­on deflec­tion shapes and rigid body vibra­ti­on moti­ons of a mobi­le pho­ne exci­ted by its vibra­ti­on alert. The mear­ur­e­ment is done, using a non cont­act, 3D, full-field, high speed ste­reo image cor­re­la­ti­on sys­tem in com­bi­na­ti­on with the new Vic-3D FFT modu­le ana­ly­zes the recor­ded defor­ma­ti­on data in the fre­quen­cy domain by pha­se-sepa­ra­ti­on method.


The mea­su­red defor­ma­ti­ons and dis­pla­ce­ments during the vibra­ti­on alert are eva­lua­ted against the refe­rence sta­te for each ste­reo image pair. In this case the recor­ding time covers about 5,5 seconds with 1000 FPS cor­re­spon­ding to about 5500 sin­gle measurements.

The fol­lo­wing figu­re show the avera­ge vibra­ti­on ampli­tu­de U.



Vibration Analysis of a Brake Disc

Bremsen1 Bremsen2
Auto­mo­bi­les are sub­ject to many forces using ope­ra­ti­on. Vibra­ti­ons from the engi­ne or the road-sur­face trans­mit through the vehicle’s chas­sis and sus­pen­si­on to the most essen­ti­al mecha­ni­cal com­po­nent of the vehic­le, the bra­ke system.


In this exam­p­le, a 14” dia­me­ter bra­ke disc from a hea­vy­du­ty truck was exci­ted using a small ham­mer to mea­su­re the vibra­ti­on shapes of the rotor. The three-dimen­sio­nal ope­ra­tio­nal deflec­tion shapes were easi­ly iden­ti­fied and mea­su­red using the Vic-3D™ HS Vibra­ti­on Ana­ly­sis Sys­tem. Ampli­tu­des as small as 40 nano­me­ters were mea­su­red at a fre­quen­cy of appro­xi­m­ate­ly 2,000 Hz.