共查询到16条相似文献,搜索用时 218 毫秒
1.
艇体变形是影响轴系校中质量的重要因素。以深水潜器为研究对象,通过建立潜器的三维有限元模型,提出利用弹簧约束调节潜器重力与浮力平衡的方法,计算潜器处于正浮状态时,在重力和静水压力作用下的艇体变形,得出潜器轴系各个轴承的位移数据,并进一步分析了轴承位移造成的轴承负荷变化。为艇体变形影响下的潜器轴系校中提供依据。分析结果表明:耐压艇体内的轴承位移要小于耐压艇体外,支撑轴承的艇体结构差异会导致轴承位移大小的不同,从而导致各个轴承负荷变化也不一样,耐压艇内液舱的不对称布置会导致位于该液舱上轴承产生较大的横向位移和负荷。 相似文献
2.
考虑艇体变形影响的轴系合理校中 总被引:1,自引:0,他引:1
为提高潜器推进轴系校中计算的准确度,使计算结果与实际情况更为接近,必须考虑艇体变形对轴承变位的影响,并将其作为轴系校中计算的初始边界条件。通过三维有限元计算,分析模型潜器的整艇湿表面结构在重力和水压作用下的变形情况,由此获得艇体艉部的结构变形数据。提出“共线程度”的概念和计算方法,将艇体结构变形数据转化为轴系各轴承相对变位数据,作为潜器推进轴系合理校中计算轴承的初始变位。利用轴系合理校中计算程序,在考虑艇体变形和轴承刚度的条件下,对模型潜器的轴系布置进行优化计算。结果表明:安装时,1#、2#、3#轴承位于理论中心线上,4#轴承变位为理论中心线向上0.4 mm能够获得合理的轴系校中状态。 相似文献
3.
4.
5.
[目的]为了研究水下航行体推进轴系在多种状态下的变形及轴承负荷变化规律,[方法]以某水下航行体为研究对象,通过建立的轴系及水下航行体混合有限元模型,对该模型在船台、码头、水下3种工况下施加符合实际情况的载荷,以及设置相应的边界条件,计算航行体结构的变形,分别提取不同工况下的轴承位置变形和轴承负荷,并以轴承1和轴承3的连线为参考线,得到各工况下轴承位置处的相对变形。[结果]结果表明,针对该水下航行体,从船台工况到码头工况再到水下工况,轴系中心线的相对变形及其大小、轴承负荷的改变趋势均有差异;对船台工况的轴系轴承2预设向上0.090 9 mm的初始变形值,可达到轴系在水下工况处于理想状态的目的。[结论]研究结果可为水下航行体后续的轴系校中提供参考。 相似文献
6.
7.
8.
9.
10.
11.
船舶推进轴系引起的船体振动问题日益突出,为了减小推进轴系传递给船体的振动,从改变振动传递路径的角度提出一种轴系整体弹性支撑方案。建立有限元模型,改变支撑平台结构刚性和隔振器刚度分别计算轴承基座间相对位移和轴承载荷。所选取的平台方案中,在重力下轴承基座间最大相对位移为1.216 mm。推力作用下当推力大于500 kN时,采用1阶弯曲频率在18.2 Hz及以上的平台方案时,轴承基座间最大相对位移小于0.3 mm,隔振器刚度变化则对轴承载荷影响不大。通过调整平台刚度和隔振器刚度,可以将弹性支撑系统对轴系影响控制在标准范围内,保证轴系安全运行。 相似文献
12.
13.
Ship hull deformation is one of the most significant influences on propulsion shafting alignment. Based on the calculation fundamentals of ship hull deformations, a new method of shafting alignment considering ship hull deformations is proposed in this paper. Ship loadings, wave loads and environment temperature differences in some extreme conditions, as well as elastic constraints, are simulated and applied to the finite element model of 76,000 DWT product oil tanker, so that ship hull deformations can be solved. Then, the deformations of the double bottom are converted to bearing offsets, which behave as boundary constraints for shafting alignment calculations. Taking the condition of light ship in calm water as a reference, the impact of hull deformations on shafting alignment is analyzed and optimized shafting alignment considering ship hull deformations is realized. 相似文献
14.
[Objective]The propulsion shafting system is an important part of a ship, and the bearing load directly affects its operating state and service life. In this paper, bearing load under hull deformation is studied using grey system theory. [Method] First, according to the empirical formula of the relative displacement of each bearing caused by the deformation of the hull of a 57 000 DWT oil tanker, the relative displacement of each bearing is calculated and input into a finite element model, and the load value of each bearing is output. On this basis, grey relationship analysis of grey system theory is introduced to study the influence degree of stern bearing displacement on the load of each bearing, and the relative change of the load of each bearing caused by the displacement of the stern bearings is analyzed. A GM (1,1) prediction model is then established for the bearing load considering the bearing displacement conditions, and the hull deformation-fitting and prediction of each bearing load are made. [Results]The results show that grey relationship analysis can effectively reflect the influence of hull deformation on bearing load. The GM (1,1) prediction model has high accuracy and prediction errors less than 6.0%, and the model test indexes can represent the accuracy of the prediction. [Conclusion]Grey system theory is effective and practical in research on propulsion shaft load. It can accurately predict bearing load under bearing displacement, giving it certain reference value for research on bearing load under actual sailing conditions. © The Author(s) 2022. 相似文献
15.