Dynamic loading on rudder blade

 

NDTRuder

Detec­tion and mea­su­re­ment of defects on a rud­der bla­de by the SE-Sen­sor and dyna­mic loading.

NDTRuder2

Set­up for mea­su­re­ment on a rud­der by dyna­mic loading.

The direct rigid moun­ting of the sen­sor on the rud­der by the suc­tion cups allows out­door mea­su­re­ment even at strong winds with high fle­xi­bi­li­ty. The high qua­li­ty inter­fe­rence fil­ters of the sen­sor per­mits mea­su­re­ment under day light conditions.

 

NDTRuder3   NDTRuder5  NDTRuder4

A: 9,3 kHz                                            B: 7,5 kHz                                           C: 5,5 kHz

Mea­su­re­ment results (time average) showing local vibra­ti­on modes of defects due to redu­ced or inho­mo­ge­ne­ous stiff­ness of the mate­ri­al. Even if a big field of view is selec­ted, it is pos­si­ble to detect small defects. Defect size and type as well as the depth of the defect (dela­mi­na­ti­on) deter­mi­ne the nor­mal modes (reso­nance fre­quen­cy) of the local defect area.