摘要
目的:利用计算机仿真技术对CT方舱结构进行模态分析,为方舱结构优化提供指导。方法:利用ANSYS有限元分析平台,以CAD模型为基础,建立CT方舱的结构有限元模型,对模型进行模态分析并研究方舱结构的动力学特性。结果:方舱结构模态避开了底盘系统的固有频率,避免了结构发生整体共振;第3阶和第4阶模态频率与发动机怠速频率接近,容易发生共振;路面不平度激励频率覆盖了舱体前6阶模态频率,建议进一步对CT设备支架采取减振措施。结论:基于有限元基本理论,利用现有的软件平台,可以对方舱舱体结构进行仿真模态分析,分析结果可以为今后方舱结构优化、改善动力学特性提供重要依据。
Objective To perform modal analysis of CT shelter by applying computer simulation technology so as to pro-vide theoretical guidance for CT shelter structure optimization. Methods Based on CAD model, the finite element model of a CT shelter was established with ANSYS simulation platform. Through modal analysis, different-order modal frequency and modal shape of the shelter were computed and the kinetic characteristics were evaluated.Results Low order modal frequency was kept away from the natural frequency range of chassis system resonance to avoid the overall structure reso-nance; the 3rd and the 4th modal frequency and engine idle speed frequency were very close so that local resonance might occur; road roughness excitation frequency covered the first 6 order modal frequencies and the further vibration-re-ducing measures of CT equipment were suggested.Conclusion Based on the theories of finite element method and current software platform, modal analysis of shelter structure can be simulated and the results can provide valuable data for the improvement of kinetic characteristics and structure design.
出处
《医疗卫生装备》
CAS
2015年第9期14-16,30,共4页
Chinese Medical Equipment Journal
基金
国家自然科学基金项目(71173232)
天津市科技计划项目(12ZCZDSF0070)
武警后勤学院博士启动金项目(WHB201413)
关键词
有限元法
CT方舱
模态分析
动力学特性
finite element method
CT shelter
modal analysis
kinetic characteristics
