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本文对Q-485柴油机缸体三维振动动态特性的分析,选用有限元数值计算和试验模态分析两套方案:前者运用子空间迭代法计算特征值和特征向量;后者则分别用频域分析中的单模志多项式曲线拟合法,多模态线性优化迭代法和多模态多项式曲线拟合法,以及时域分析中的复指数法进行参数识别。在0—800Hz频率范围内识别出了6个模态,建立了离散系统的模态模型,得到了较满意的结果。
In this paper, the three-dimensional dynamic vibration characteristics of Q-485 diesel engine cylinder are analyzed. Two schemes of finite element numerical calculation and experimental modal analysis are selected: the former uses subspace iteration method to calculate eigenvalues and eigenvectors; the latter uses frequency domain analysis respectively. The single-mode polynomial curve fitting method, the multi-modal linear optimization iteration method and the multi-modal polynomial curve fitting method, and the complex exponential method in the time domain analysis are used for parameter identification. Six modalities were identified in the 0-800Hz frequency range, and a modal model of the discrete system was established. Satisfactory results were obtained.