基于临界平面法的试验件随机振动疲劳寿命预测  

Random vibration fatigue life prediction of test parts based on critical plane method

作　　者：邢雪 朱贺 马炳杰 夏兆旺 陈波 XING Xue;ZHU He;MA Bingjie;XIA Zhaowang;CHEN Bo(Shanghai Marine Diesel Engine Research Institute,Shanghai 201100,China;School of Energy and Power,Jiangsu University of Science and Technology,Zhenjiang 212003,China;National Key Laboratory of Marine Engine Science and Technology,Shanghai 201108,China)

机构地区：[1]中国船舶集团有限公司第七一一研究所,上海201100 [2]江苏科技大学能源与动力学院,江苏镇江212003 [3]先进船舶发动机技术全国重点实验室,上海201108

出　　处：《舰船科学技术》2025年第6期1-6,共6页Ship Science and Technology

摘　　要：为对随机振动工况下的船舶结构寿命预测建立数学模型,由于试验条件的限制,以标准试验件为研究对象进行随机振动工况下的疲劳寿命预测,基于临界平面法,结合随机过程谱矩理论以及Minner线性疲劳累积理论,建立了一个随机振动疲劳寿命预测模型。开展了试验件模态试验以及随机振动疲劳试验,得到了试验件在平直谱频段范围均为70~150 Hz,峰值分别为0.15、0.25、0.35 g^(2)/Hz工况下的疲劳寿命。预测模型的计算结果表明,试验件在3种工况下的疲劳寿命试验值与预测值误差分别为1.83倍、1.70倍、1.89倍,均在2.5倍误差带以内,说明了该预测模型在试验件悬臂梁安装形式随机振动工况下寿命预测的可行性,对处于多轴随机振动工况下的船舶结构寿命预测具有一定的借鉴意义。To establish a mathematical model for predicting the service life of ship structures under random vibration conditions,due to the limitations of experimental conditions,a random vibration fatigue life prediction model was established for standard test pieces by combining the critical plane method,the theory of random process spectrum moments,and Minner's linear fatigue accumulation theory.The modal test and random vibration fatigue test of the test piece were carried out.The fatigue life of the test piece was obtained in the straight spectrum frequency range of 70-150 Hz,and the peak values were 0.15,0.25 and 0.35 g^(2)/Hz,respectively.The calculation results of the prediction model show that the error between the experimental value and the predicted value of the fatigue life of the test piece under the three working conditions is 1.83 times,1.70 times and 1.89 times respectively,all within the error band of 2.5 times,which shows the feasibility of the prediction model in the random vibration condition of the cantilever beam installation form of the test piece,It can be used as a reference for the life prediction of marine pressurization pipes and other marine components under multi-axis random vibration conditions.

关 键 词：临界平面法 随机振动 悬臂梁 疲劳寿命预测 

分 类 号：U612.3[交通运输工程—船舶及航道工程]