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Vibration Measurement

Operation mode analysis on a mobile phone during vibration alert

Nokia3

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Ref­er­ence coor­di­nates and con­tour of the mobile phone.

 

 

 

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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.

Nokia

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.

 

Nokia2

Vibration Analysis of a Brake Disc

Bremsen1 Bremsen2
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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.

Bremsen3

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.