Research Article
Experimental and Computational Modal Analyses for Launch Vehicle Models considering Liquid Propellant and Flange Joints
Table 5
Modal tests and analysis results (filling ratio: 0%).
| | Modes | First bending mode (Hz) | Second bending mode (Hz) |
| | Number of flange joints: 24 | | Modal test | 154.3 | 424.3 | | MSC.NASTRAN | 149.4 | 404.2 | | Error (%) | −3.18 | −4.74 |
| | Number of flange joints: 12 | | Modal test | 151.4 | 420.7 | | MSC.NASTRAN | 140.5 | 395.8 | | Error (%) | −7.20 | −5.92 |
| | Number of flange joints: 6 | | Modal test | 140.7 | 420.0 | | MSC.NASTRAN | 120.5 | 373.9 | | Error (%) | −14.36 | −10.98 |
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