中间曲柄 meaning in Chinese

center crank

( 2 ) the crack compares with one depth with the first steps and the second steps natural frequency vibration , crack position near crank arm and main shaft transition round natural frequency little place under crankshaft ; with the third steps and the fourth steps natural frequency vibration , the smaller close to the second crank arm of crankshaft and round place natural frequency of the main shaft transition the position is
( 2 )裂纹同一深度比以第1阶和第2阶固有频率振动，裂纹位置越靠近曲轴中间曲柄臂与主轴过渡圆处固有频率越小；以第3阶和第4阶固有频率振动，位置越靠近曲轴第二个曲柄臂与主轴过渡圆处固有频率越小。