To provide a fatigue damage evaluation device that can accurately evaluate fatigue damage of components of a mobile crane.SOLUTION: A fatigue damage evaluation device AA comprises: a moment measuring device 41 that measures a falling moment acting on a boom; a turning angle measuring device 42 that measures a turning angle of the boom; and an arithmetic unit 40 to which measured values of the moment measuring device 41 and the turning angle measuring device 42 are input. The arithmetic unit 40 obtains a stress amplitude ratio which is a ratio of a fluctuation range of stress generated in an evaluation object portion to the total amplitude of rated stress on the basis of the measured values of the falling moment and the turning angle, for each work from the lift-off to the landing of a suspended load, obtains a one-work fatigue damage value from the stress amplitude ratio, integrates the one-work fatigue damage value in a predetermined period, and obtains a cumulative fatigue damage value.SELECTED DRAWING: Figure 5
【課題】移動式クレーンの構成部材の疲労損傷を精度よく評価できる疲労損傷評価装置を提供する。【解決手段】疲労損傷評価装置AAは、ブームに作用する倒伏モーメントを測定するモーメント測定器41と、ブームの旋回角を測定する旋回角測定器42と、モーメント測定器41および旋回角測定器42の測定値が入力される演算装置40とを備える。演算装置40は、吊荷の地切から着地までの一作業ごとに、倒伏モーメントおよび旋回角の測定値に基づき評価対象部位に生じる応力の変動幅の定格応力全振幅に対する比率である応力振幅比を求め、応力振幅比から一作業疲労損傷値を求め、所定期間における一作業疲労損傷値を積算して累積疲労損傷値を求める。【選択図】図5
DEVICE, PROGRAM, AND METHOD FOR EVALUATING FATIGUE DAMAGE OF MOBILE CRANE
移動式クレーンの疲労損傷評価装置、疲労損傷評価プログラムおよび疲労損傷評価方法
2021-12-13
Patent
Elektronische Ressource
Japanisch
IPC: | B66C Krane , CRANES / G01H MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES , Messen von mechanischen Schwingungen oder Ultraschall-, Schall- oder Infraschallwellen / G01M TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES , Prüfen der statischen oder dynamischen Massenverteilung rotierender Teile von Maschinen oder Konstruktionen |
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