ass日本风韵熟妇pics男人扒开女人屁屁桶到爽|扒开胸露出奶头亲吻视频|邻居少妇的诱惑|人人妻在线播放|日日摸夜夜摸狠狠摸婷婷|制服 丝袜 人妻|激情熟妇中文字幕|看黄色欧美特一级|日本av人妻系列|高潮对白av,丰满岳妇乱熟妇之荡,日本丰满熟妇乱又伦,日韩欧美一区二区三区在线

By the influence of the environmental loads and the material characters, propagations of mechanical components' fatigue cracks usually have stage act. In each stage, the cracks propagate with different behavior features. For studying the behavior features and getting a method to predicting the stage transition, time series analysis method was utilized to process the vibration acceleration data, which were recorded to make identification and prediction for the fatigue crack growth behavior patterns in the fatigue test of engine crankshafts. By comparing with the test results of crack growth rate, the prediction capability of the time series analysis method for crack growth behavior pattern was verified.