Abstract
The natural frequencies of a portable rotay cutter with an electric motor were calculated using the following simplified models.
(A) Double beam system which consists of two beams connected with each other at 5 points by springs.
(B) Double beam system connected by 3 supporting points and fixed with each other at the ends of the second beam.
Results obtained are as follows;
(1) The finite element method reqired considerably longer calculation time than the Myklestad method or Transfer Matrix method in this case, but it seemed to be convenient for analysis of complicated structure like tree limbs.
(2) Some of models in Fig. 1 or partially amended model may serve for predicting natural frequencies or for vibration analysis of such portable rotary cutters as one with an electric motor.
