拉床工作模态参数分析

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研究了LG51SH立式拉床工作模态参数,以考察拉床机械结构对其动态特性的影响。在拉床主要结构上布置测点,进行拉刀工作激励下的模态试验,利用LMS振动测试设备SCADAIII-105,获得实测的频响数据。采用多参考最小二乘复频域（PolyMAX）法,分析拉床工作模态参数。给出了模态识别稳态图,以及前10阶典型振型、模态阻尼比和固有频率等拉床工作模态参数。分析结果表明,LG51SH拉床整机模态中有38Hz、192Hz的固有频率,与6Hz的拉削力基频的整数倍很接近,应合理安排拉削速度,避免出现激励固有频率的拉削力基频。 Modal parameters for LG51SH broaching machine from operational responses is studied to examine the dynamic properties of mechanical structure.The operational modal is analyzed using PolyMAX method w ith responsive data of key point in broaching machine,w hich is excited in practical broaching operation and tested by LMS SCADAIII-105 system.The identified steady state modal、representative modal shape、modal damping ratio and natural frequency in broaching are presented.The test and analysis result show s that there are natural frequency of 38Hz and 192Hz,w hich are close to multiple of the fundamental frequency of cutting force in broaching,6Hz,therefore,reasonable cutting velocity should be adopted to void producing fundamental frequency of cutting force in broaching.