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[分享] CosmosWorks算法验证文件 7 (Mode-frequency Analysis )

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发表于 2007-11-7 17:43:04 | 显示全部楼层 |阅读模式 来自: 中国上海

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提示:如果分析得出第一阶频率接近72.059就可以了,因为CosmosWorks(2006)在频率分析时没有办法设置旋转刚度软化的影响,所以不会得到后面那个target值。0 ]2 n6 I, d$ J. i; q4 P  V
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Title      Vibration of a Rotating Cantilever Blade9 K/ L4 D$ D) [- G
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Overview, Y: s' Z$ z+ F' }0 D9 M$ @1 M: k+ \1 N
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Reference:W. Carnegie, “Vibrations of Rotating Cantilever Blading”, Journal Mechanical Engineering Science, Vol. 1 No. 3, 1959, pg. 239
Analysis Type(s):Static Analysis ' ?0 M  S, j8 _0 ]) @. Z
Mode-frequency Analysis
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A blade is cantilevered from a rigid rotating cylinder. Determine the fundamental frequency of vibration of the blade, f, when the cylinder is spinning at a rate of Ω .3 n9 `; H: u4 w; t- [

8 m6 q* _4 f! Y4 ?( a* y% P1 {Figure 54.1  Rotating Cantilever Blade
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Material Properties
E = 217 E9 Pa
ρ = 7850 kg/m3
υ = 0.3
Geometric Properties
r = 150 mm
l= 328 mm
b = 28 mm
t = 3mm
Loading
Ω = 100π rad/sec
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Analysis Assumptions and Modeling NotesThe problem is solved in two different ways:
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  • Using Elastic Shell Elements (SHELL63)
  • Using 3-D Solid Shell Elements (SOLSH190)
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Spin (centrifugal) softening is used. Since the cylinder is rigid, the base of the blade has its displacements constrained. A static prestress analysis is performed to include the inertial effects resulting from the rotation of the cylinder.* U7 m" @# _* K5 i5 P. }. ~, t' F* v
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Results Comparison6 k. C5 r' i1 D
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TargetANSYSRatio
SHELL63
f, Hz52.7552.010.986
SOLSH190
f, Hz52.7551.800.982
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5 a7 Q" j4 A0 e[ 本帖最后由 tigerdak 于 2007-11-9 15:25 编辑 ]
 楼主| 发表于 2007-11-7 17:45:55 | 显示全部楼层 来自: 中国上海
都不考虑旋转刚度软化的情况下,在偶的机器上CosmosWorks是72.059,ANSYS是72.060。
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