FORFARANDE FOR PROVNING AV LOPHJUL HOS FLEKTAR

摘要

A method of testing fan impellers for strength in which dynamic loads are repeatedly applied to the impeller by inducing torsional vibrations of 5 &cirf& 10<-3> to 5 &cirf& 10<-1>s in period and 2 to 10 DEG in amplitude. The impellers are subjected preferably to a continuous torque to more nearly simulate their loading during normal operation. The test is an improvement on the test in which the impellers are repeatedly started and stopped.