噪声与振动控制
譟聲與振動控製
조성여진동공제
NOISE AND VIBRATION CONTROL
2014年
2期
140-143
,共4页
李晓磊%刘建敏%李晓伟%乔新勇
李曉磊%劉建敏%李曉偉%喬新勇
리효뢰%류건민%리효위%교신용
振动与波%柴油机缸盖%Hilbert-Huang变换%阻尼比%模态频率
振動與波%柴油機缸蓋%Hilbert-Huang變換%阻尼比%模態頻率
진동여파%시유궤항개%Hilbert-Huang변환%조니비%모태빈솔
vibration and wave%cylinder head of diesel engine%Hilbert-Huang transform%damping ratio%modal frequencies
实验敲击某型12150柴油机缸盖，采集振动加速度信号。利用经验模式分解提取了振动加速度信号中主要频率成分对应的模态响应衰减分量，对各分量进行希尔伯特变换和最小二乘法拟合，得到了缸盖系统的模态频率及阻尼比。将计算结果用于缸盖系统的瞬态动力学仿真，说明利用该方法计算的缸盖系统模态频率及阻尼比合理，能够满足缸盖系统动力学研究的需要。
實驗敲擊某型12150柴油機缸蓋，採集振動加速度信號。利用經驗模式分解提取瞭振動加速度信號中主要頻率成分對應的模態響應衰減分量，對各分量進行希爾伯特變換和最小二乘法擬閤，得到瞭缸蓋繫統的模態頻率及阻尼比。將計算結果用于缸蓋繫統的瞬態動力學倣真，說明利用該方法計算的缸蓋繫統模態頻率及阻尼比閤理，能夠滿足缸蓋繫統動力學研究的需要。
실험고격모형12150시유궤항개，채집진동가속도신호。이용경험모식분해제취료진동가속도신호중주요빈솔성분대응적모태향응쇠감분량，대각분량진행희이백특변환화최소이승법의합，득도료항개계통적모태빈솔급조니비。장계산결과용우항개계통적순태동역학방진，설명이용해방법계산적항개계통모태빈솔급조니비합리，능구만족항개계통동역학연구적수요。
Hammering test is taken to the cylinder head of a 12150 diesel engine and the acceleration signal of vibration is collected. The attenuation components of modal response corresponding to the main frequency components in the vibration acceleration signal are extracted by EMD. Each component is processed with Hilbert Transform (HT) and least square fitting. Then, modal frequencies and damping ratio of the cylinder head system are obtained. The result is used in transient dynamic simulation of the cylinder head system and good result is gained. It is proved that the modal frequencies and damping ratio of the cylinder head system obtained by this method are reasonable and can meet the need of dynamics research of the cylinder head system.
