共查询到10条相似文献，搜索用时 250 毫秒
1.
秦冲 《漯河职业技术学院学报》2014,(5):19-21
使用ANSYS对印制电路板装配体进行了模态分析、模态叠加法谐响应分析和PSD分析,得出了印制电路板的前四阶阵型,并结合谐响应分析结果找出与模态分析固有频率存在差异的原因,通过PSD分析得出在结构的共振点存在位移峰值,这些结论为进一步分析和优化设计提供了重要的理论依据。 相似文献
2.
获取机床结构的动态特性是确保精密加工的重要手段之一.基于有限元分析软件ANSYS Workbench 12.0,在Pro/E软件中建立机床主轴、主轴箱三维模型,进而将其导入ANSYS Workbench 12.0中进行有限元建模和模态分析,获得了固有频率和振型;在此基础上,分析了振型图中的最大变形区域,评价了共振薄弱点并提出了相应的结构修改建议. 相似文献
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采用有限元方法对K5206NM压缩机机体进行了模态分析和振动响应分析,不仅获得了机体的固有频率和振型,还得出机体在动态工况下的位移、应力、速度及加速度变形云图,找到了机体结构的薄弱环节,并提出了相应的改进方案,为机体的结构设计改进提供理论依据. 相似文献
4.
A dynamic finite element method combined with finite element mixed formula for contact problem is used to analyze the dynamic characteristics of gear system. Considering the stiffness excitation, error excitation and meshing shock excitation, the dynamic finite element model is established for the entire gear system which includes gears, shafts, bearings and gearbox housing. By the software of I-DEAS, the natural frequency, normal mode, dynamic time-domain response, frequency-domain response and one-third octave velocity grade structure borne noise of gear system are studied by the method of theoretical modal analysis and dynamic response analysis. The maximum values of vibration and structure borne noise are occurred at the mesh frequency of output grade gearing. 相似文献
5.
为了获取某四驱汽车防滑差速器壳体的固有振动特性和验证所建有限元模型的正确性,以某四驱汽车防滑差速器壳体为研究对象,首先基于Abaqus软件对其进行模态仿真分析,得到了防滑差速器前6阶固有特性参数及其振型;然后运用锤击实验对防滑差速器进行模态分析实验,测取其振动情况;最后将两种方法获取的差速器壳体前6阶振型及振动频率进行对比。结果发现两种方法获取的各阶振型基本一致,固有频率误差在5%以内。这种以模态仿真分析为前提,模态实验为补充,仿真结果与实验结果相对比的分析方法有效地验证了有限元模型的正确性,为防滑差速器的有限元分析提供了有效的参考依据。 相似文献
6.
用有限元计算桥梁结构的前几阶固有频率和振型等模态参数,在此基础上进行现场动态测试,将动测信号进行频谱分析,可识别出桥梁结构的固有频率等参数.综合分析表明,该桥梁结构动力特性的计算值与动测识别值两者是一致的,因此,该大桥动力特性达到了设计要求.这种计算和现场测试相结合的方法,能可靠得到桥梁结构的动力特性,借此,可检验大桥的施工质量和确定大桥的实际承载能力. 相似文献
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The seismic analysis of a rigid-framed prestressed concrete bridge in Tianjin Light Railway is performed. A 3-D dynamic finite element model of the bridge is established considering the weakening effect caused by the soft soil foundation. After the dynamic characteristics are calculated in terms of natural frequencies and modes, the seismic analysis is carried out using the modal response spectrum method and the time-history method, respectively. Based on the calculated results, the reasonable design values are finally suggested as the basis of the seismic design of the bridge, and meanwhile the problems encountered were also analyzed.Finally, some conclusions are drawn as ：1 ) Despite the superiority of rigid-framed prestressed concrete bridge,the upper and lower ends of the piers of the bridge are proved to be the crucial parts of the bridge, which are easily destroyed under designed earthquake excitations and should be carefully analyzed and designed; 2) The soft soil foundation can possibly result in rather weakening of the lateral rigidity of the rigid-framed bridge, and should be paid considerable attention; 3) The modal response spectrum method, combined with time-history method, is suggested for the seismic analysis in engineering design of the rigid-framed prestressed concrete bridge. 相似文献
9.
Zhi Chao Ong Hong Cheet Lim Shin Yee Khoo Zubaidah Ismail Keen Kuan Kong Abdul Ghaffar Abdul Rahman 《浙江大学学报(A卷英文版)》2017,18(2):92-105
The impact-synchronous modal analysis (ISMA), which uses impact-synchronous time averaging (ISTA), allows modal testing to be performed during operation. ISTA is effective in filtering out the non-synchronous cyclic load component, its harmonics, and noises. However, it was found that at operating speeds that coincide with the natural modes, ISMA would require a high number of impacts to determine the dynamic characteristics of the system. This finding has subsequently reduced the effectiveness and practicality of ISMA. Preservation of signatures during ISTA depends on the consistency of their phase angles on every time block but not necessarily on their frequencies. Thus, the effect of phase angles with respect to impact is seen to be a very important parameter when performing ISMA on structures with dominant periodic responses due to cyclic load and ambient excitation. The responses from unaccounted forces that contain even the same frequency as that contained in the response due to impact are diminished with the least number of impacts when the phase of the periodic responses is not consistent with the impact signature for every impact applied. The assessment showed that a small number of averages are sufficient to eliminate the non-synchronous components with 98.48% improvement on simulation and 95.22% improvement on experimental modal testing when the phase angles with respect to impact are not consistent for every impact applied. 相似文献
10.
张江林 《邢台职业技术学院学报》2010,27(1):61-65
应用有限元方法在机体结构模态分析的基础上,对某四缸内燃机曲轴各主轴承在曲轴轴颈作用力激励下的结构振动进行了计算,得到了曲轴各主轴承在不同方向上的结构振动响应曲线,并对其响应特征进行了分析。在此基础上,对轴承结构动力响应与机体结构模态特征间的关系以及主轴承结构振动与机体结构振动和噪声辐射之间的关系也作了进一步的讨论。结果表明作用在主轴承上的径向力可以激起主轴承的轴向往复振动,该轴向振动传播到机体裙部并产生噪声辐射。 相似文献