固定结合面不同位置刚度参数对机床动态特性的影响
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摘要
框中框式结构机床中以固定结合面联接的床身、立柱为研究对象,通过拉格朗日方程的方法建立床身、立柱的动力学理论模型,不同位置采用不同的结合面刚度参数来研究结合面法向刚度和切向刚度对系统各阶模态频率的影响;然后基于多学科优化设计软件iSIGHT,搭建整机动态特性分析优化系统框架来验证计算结果的正确性。结果表明,结合面切向刚度相比较于法向刚度对系统模态频率的影响较小;刚度参数增加,系统各阶模态频率趋于稳定;不同位置结合面刚度值大小影响不同阶次的模态频率值。
Taking bed and column coupled by fixed joints in the box-in-box construction machine tool as the object, dynamics theory model of bed and column was established by the method of Lagrange equation, and for research the joint surface normal stiffness and the tangential stiffness in different position influence on the modal frequencies of the system, different joint stiffness parameters were used in different positions. Based on multidisciplinary optimization software iSIGHT, the framework of dynamic characteristic analysis and optimization system for machine tool was constructed to verify the correctness of the results.The results show that the joint surface tangential stiffness compared with normal stiffness less effect on the system modal frequencies; With the increase of stiffness parameters, the modal frequencies of the system tend to be stable; Different location joint stiffness value affect different orders of modal frequency value.
Taking bed and column coupled by fixed joints in the box-in-box construction machine tool as the object, dynamics theory model of bed and column was established by the method of Lagrange equation, and for research the joint surface normal stiffness and the tangential stiffness in different position influence on the modal frequencies of the system, different joint stiffness parameters were used in different positions. Based on multidisciplinary optimization software iSIGHT, the framework of dynamic characteristic analysis and optimization system for machine tool was constructed to verify the correctness of the results.The results show that the joint surface tangential stiffness compared with normal stiffness less effect on the system modal frequencies; With the increase of stiffness parameters, the modal frequencies of the system tend to be stable; Different location joint stiffness value affect different orders of modal frequency value.
引文
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[2] Shamine D M,Hong S W,Shin Y C. Experimental identification of dynamic parameters of rolling element bearings in machine tools[J]. Journal of Dynamic Systems,Measurement,and Control,Trans ASME,2000,122:95-101.
[3]武友德,伍晓亮,朱超.机床典型结合部参数优化识别[J].机械设计与研究,2015(2):147-150.
[4] Mao Kuanmin, Li Bin, Wu Jun Shao, et al. Stiffness influential factors-based dynamic modeling and its parameter identification method of fixed joints in machine tools[J]. International Journal of Machine Tools and Manufacture,2010,50(2):156-164.
[5]覃文洁,左正兴,刘玉桐,等.机床整机的动态特性分析[J].机械设计,2000,17(10):24-26.
[6] ZhaoYong-sheng,Yang Cheng,Cai Li-gang. Surface contact stress-based nonlinear virtual material method for dynamic analysis of bolted joint of machine tool[J]. Precision Engineering,2016,43:230-240.
[7] Padmanabhan K K,Murty A S R. Damping in structural joints subjected to tangential loads[J]. Tribology International Proc Instn,1991,205:121-129.
[8]吴志坚,贾宝贤,刘永红.固定结合面参数的计算机模拟计算[J].石油大学学报,2000,24(2):82-85.
[9]李奎,汪慧芬,刘婷婷.数控机床动态特性优化[J].机械设计,2011,28(5):75-79.
[10]刘阔. VMC0540d机床床身和立柱结构的谐响应分析[J].机械设计与制造,2011(12):162-164.
[11]赵胜辉.精密卧加T型床身三点支撑优化设计[D].天津:天津大学, 2014.
[12]牛文铁,田建伟.基于iSIGHT的机床整机结构方案设计与集成优化[J].天津大学学报:自然科学与工程技术版,2016,49(2):120-127.
[13] Park J S. Optimal latin-hypercube designs for computer experiments[J]. Journal of Statistical Planning&Inference,1994,39(94):95-111.