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螺旋桨桨叶流固耦合动力分析与试验研究
| 论文题名： | 螺旋桨桨叶流固耦合动力分析与试验研究 |
| 关键词： | 螺旋桨桨叶;流固耦合;耦合震动 |
| 摘要： | The prediction of vibratory excitation forces that are induced by the propeller is one of the most important tasks for tbe ship engineers and researchers. These forces are transmitted to the poop of the hull;the propeller produces the excitation to the hull,so the propeller structure can be regarded as the vibration source. The dynamic characteristics of the propeller should be study at first in the semi-immense water，and especially the hull surface boundary effect. In this thesis,the emphasis on the effect of the ship hull surface acts as the flexibility and rigid boundary, which can influence the fluid-structure coupling vibration result of propeller, relative to the effects of pressure release sea-surface. Both experimental and computational means can be used to assist the client in judging the propeller design to resport to predict its dynamic characteristies. FEM was applied to solve the dynamic characteristics，prior to accepting the FE results as representative of a correct solution useful for design purposes.The finite element(FE) model of the propellel was conducted for natural frequencies computation in air and in water，based on the data measured from model-propeller firstly. And the FE model was utilized to analysisthe dynamic characteristics of the underwater structure in air and in water through FE code ANSYS. The surface of the water was considered as pressm'e free,and the volume of fluid was assumed 10 times larger than the diameter of propeller；while the other surface asvelocity zero.It can be regarded as semi-immense fluid field. The nature frequency of the propeller in water obtained to compare with at in air.This vibration of propeller was affected by the reduced space between the propeller and the stern hull，very evident in hulls with light displacement.For different boundary.based on the location description of propellerand hull plate.the propeller disc is 0.12d forward of the stern waterline at the pointed condition.The rigid hull surface is used to simulate the boundary condition；and then 2 kinds of plate(8mm and 70mm) were used to simulate flexibility hull surface.All the nature frequency results above had been used to comparision to show the effect of hull surface. The numerical result is just one aspect to discuss the problem，while experiment should also provide the other face to aid the numerical result and amend the conclusion，Each node's information used in numerical simulation can be accepted in the test.The DASP system was introduced to analysis the vibration mode of the propeller structure. In most vibration problems，however，mode shape of the structure was interested primarily.The modes in airwere tested using the DASP instrument,comparison with the numerical result as the otherstand proof. The numerical results and experiment data can be used to discuss the water influence to the propeller blade,and also the different boundary condition.The conclusion or principle will be offered to aid the engineering usage.The frequency values of the semi-immense fluid field have already computed before. |
| 作者： | 娄本强 |
| 专业： | 船舶与海洋结构物设计制造 |
| 导师： | 赵德有 |
| 授予学位： | 硕士 |
| 授予学位单位： | 大连理工大学 |
| 学位年度： | 2008 |
| 正文语种： | 中文 |
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