基于试验模态法的直驱式超高压泵动态特性研究

On the Dynamic Characteristics of Direct-Driven Super Pressure Pumps Based on an Experimental Modal Analysis

为得到直驱式超高压泵的动态特性参数,采用试验模态分析方法,对超高压水射流直驱式超高压泵的整体结构进行分析。在试验数据的基础上对频响函数进行优化,利用单模态参数识别法对直驱泵进行参数识别,获取整机固有频率、阻尼比和相应的振型。研究结果表明:直驱式超高压泵的固有频率集中在低频段(49.90,100.21,149.13,175.93 Hz)和高频段(高阶模态频率大于1 000 Hz);薄弱环节主要集中在泵头阀部分;直驱式超高压泵在工作过程中,电机速度应避开981.8,2 004.2,2 982.6 r/min附近的3个速度范围。

To obtain the dynamic parameters of direct-driven super pressure pumps, an experimental modal analysis has been made of the overall structure of direct-driven pumps. The frequency response function is optimized based on the analysis of the experimental data, and a single-mode parameter identification method has been adopted to identify the parameters of direct-driven pumps, thus obtaining the machine inherent frequencies, damping ratio, and the corresponding mode shape. The research results show that the inherent frequency of super pressure direct-driven pump mainly concen-trate in the low frequencies （49.90, 100.21, 149.13, 175.93 Hz） and high frequency （with a high mode frequencies above 1 000 Hz）;while the weak links mainly concentrate on the valves. During the operating process of direct-driven super pressure pumps, three ranges of speed, 981.8, 2 004.2, and 2 982.6 r/min should be avoided by the motor speed.