Abstract: For verifing ROPS (Roll-Over Protective Structure) meeting the performance requirements of ISO-3471 if a machine is rolled, over. The Laboratory tests are carried out. According tests results, a new plastic method are developed to determining the ROPS's defelection during side load. After making a comparative examination of its estimates with the experimental results, the new method is recognized to be very effective. That is, the performance of energy absorbing can be predicted by the new method with high accuracy on a design stage.

Key words: Earth-moving machinery, Plastic analysis, Roll-over