共查询到18条相似文献,搜索用时 140 毫秒
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为研究泡沫铝材料填充方钢管结构的动态减振性能,分别对空方管、无粘胶和有粘胶的泡沫铝填充方管3种形式的阻尼性能进行实验和仿真研究,并分析其阻尼作用机制。结果表明,泡沫铝材料的填充能显著提高空方管的阻尼性能,采用粘胶的连接方式对于阻尼性能的提高是有限的,无粘胶(配合连接)的连接方式更为有利。 相似文献
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机床床身是机床的重要部件,它起着支撑立柱、工作台等部件的作用,其性能的好坏直接影响到机床的加工精度。在对HX7910五面加工中心床身结构动态优化设计过程中,建立HX7910五面加工中心床身的有限元模型,分析了其前六阶模态。根据分析结果确定筋板为优化对象,采用灵敏度优化法首先对床身内部筋板结构参数进行动态灵敏度分析。在灵敏度分析基础上,进行结构优化设计,得到了较优的结构参数,提高了加工中心床身的动态特性,从而提高床身的性能。 相似文献
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为了在摩擦条件下获得数控机床系统的动态性能指标,利用系统建模与仿真的方法对数控机床的X-Y工作平台进行研究,建立了数控机床伺服系统动态性能的仿真模型,分析伺服系统动态特性,应用ADAMS和Matlab/Simulink软件实现对整个系统的动态性能仿真,可迅速地为数控机床伺服系统的调试提供可靠依据。 相似文献
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Yingchun Liang Wanqun Chen Qingshun Bai Yazhou Sun Guoda Chen Qiang Zhang Yang Sun 《The International Journal of Advanced Manufacturing Technology》2013,69(1-4):237-244
This paper presents the design and dynamic optimization of an ultraprecision diamond flycutting machine tool for producing flat half-meter-scale optics. A novel tool holder is designed, which can achieve micron-level axial feeding and tool angle accurate adjustment, and new technology is also used to allow alignment of the spindle axis to the horizontal-slide travel. The design and characteristic analyses of this machine tool are presented, including the static, modal, harmonic, and rotor dynamic analysis for predicting its static and dynamic performance. A prototype is built based on the analysis and FE model considering the joint parameters. The machining test shows that this machine tool can successfully produce 415?×?415-mm surfaces on aluminum and crystalline optics, with 1.3-μm flatness and 2.4-nm rms roughness. Moreover, the differences of design concepts are discussed between the ultraprecision machine tool for optical parts machining and the conventional machine tool. 相似文献
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Bartosz Powa?ka Tomasz Okulik 《The International Journal of Advanced Manufacturing Technology》2012,59(1-4):1-7
The work presents a new technology for the assembly of ball guideway systems which involves the use of a thin layer of a casting compound. The experimentally verified simulation research presented in the work indicates that the use of the casting compound between the guide rail and the bed of the machine tool positively influences the dynamics of the system. The paper is concerned with the comparison between the new solution with the guide rail assembly technology presently in use on the basis of a guideway system consisting of a body and a milling table. The dynamics was compared with the use of a frequency response function which had been determined in an impulse test. The proposed solution is characterised by a higher dynamic stiffness, which may directly influence the precision of the machined surfaces. 相似文献
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建立数控机床整机系统有限元模型,对于预估和优化机床的性能有着重要的意义。但是,由于整机系统结构复杂以及存在各种形式的结合面,因而很难直接建立反映实际的有限元计算模型。文中以沈阳机床集团某立式加工中心为例,研究了数控机床整机系统有限元建模方法。首先,在保证力学关系不变的情况下,对整机系统进行了物理模型的简化。其次,在有限元模型的固定和滑动结合部中引入接触区域分布设置弹簧来模拟结合面的法向和切向刚度。最后,以测试的模态参数为基准,修正不准确的有限元模型,使模型的频率误差小于15%,得到可以反映实际动态特性的有限元模型。 相似文献