Comparison of Beam Element and Shell Element in Analyzing Inherent Vibration of Structures
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摘要: 分别采用ANSYS中的beam188单元和shell63单元对圆筒形结构进行有限元建模,利用APDL语言编制了程序,计算了长径比为4～20的圆筒形结构的自由振动特性,对固有频率和模态进行了分析。结果表明,对于长径比>10的筒形结构,采用ANSYS中以Timoshenko梁为基础的单元基本可以满足要求;对于长径比<6的筒形结构,需根据工程实际,采用更接近结构实际情况的单元(如壳单元或体单元)建立模型,以提高计算结果的准确性。Abstract: Finite element models of tube structures are set up using ANSYS with beam 188 element and shell63 element respectively.The computing programs are written by means of APDL language,the free vi-bration characteristics of tube structures with length-to-diameter ratios of 4~20 are computed.Also,the cor-responding inherent frequencies and modes are analyzed.The results show that as to tube structures with length-to-diameter larger than 10,the beam element of ANSYS based on Timoshenko beam can meet our re-quirements;but as to tube structures with length-to-diameter smaller than 6,in order to improve the accuracy,elements which are more close to real structures such as shell element or solid element should be used ac-cording to practical engineering.
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Key words:
- Tube structure /
- Beam element /
- Shell element /
- Modal analysis /
- Element choosing
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