| 1. | Provided that the submarine structure strength is met , noise is vital to submarine battle ability
在保证潜艇结构强度的前提下，安静性和隐身性对提高潜艇的战斗力至关重要。 |
| 2. | With finite element method , a series of stability analysis for a cylindrical shell , which is similar to the real construction of a submarine hull is carried out
模拟实际潜艇结构、装载、安装的设备、制造公差及腐蚀等进行了一系列的计算和实验验证。 |
| 3. | The numerical simulation method based on the strip - yield method has begun to be used in the air space structures , but not used in the fatigue questions in the submarine
基于带状屈服模型的数字仿真方法在航空航天结构上已经开展运用，但尚未用于潜艇结构疲劳断裂问题。 |
| 4. | Comparing with the model test data the result of the calculation is more close to that from the formula in " design and calculation standard for submarine structure ( gjb ) "
与实验数据进行比较，其计算结果比利用gjb 《潜艇结构设计计算规则》的计算结果更接近于真实值。 |
| 5. | The using rules about the fatigue strength in " design and calculation standard for submarine structure " is worked out according to the standard that the ultimate time of submergence is less than 500
现行的“潜艇结构设计计算规则”中关于疲劳强度的设计，是按照极限下潜次数不超过500次的标准进行校核。 |
| 6. | With the using of high strength steel and the development of the structure design , the fatigue strength becomes more and more prominent and the rules of design can no longer meet the demand of the design nowadays
由于新的高强度钢材料的使用，和结构设计发展的需要，潜艇结构的疲劳强度问题更加突出，现行设计规范已经不能满足设计的要求。 |
| 7. | This paper is aimed to provide a computational method of sound radiation from the pressure and non - pressure hulls of submarines subjected to harmonious point forces . it is significant for reducing vibration and sound radiation of the submarine hull , guiding the optimization design of submarine and enhancing its battle ability
本文寻求潜艇耐压和非耐压船体结构受激振动辐射噪声的计算方法，分析潜艇结构辐射噪声的影响因素，对降低艇体振动和辐射的噪声，以及潜艇结构进行隐身优化设计、提高其战斗力具有十分重要的理论指导意义。 |
| 8. | The submarine noise detected by sonar consists of two parts : propeller - generated hydro - dynamical noise , which can be greatly reduced by improving the submarine rear shape ; radiated noise from the submarine structure excited by the centrifugal forces ( moments ) of rotatory machine , which is more complicated and influenced by many factors
声纳所探测的潜艇噪声包括两部分，一是螺旋桨运转带来的水动力噪声，二是潜艇主机工作时产生的不平衡力和力矩引起潜艇结构振动，带动流场振动从而辐射噪声。通过改进潜艇尾部线型设计，已将水动力噪声降到比较低的程度，而结构噪声则复杂得多，与许多因素有关。 |
| 9. | The numerical simulation technique is used to study on the fatigue properties of submarine with high strength steel . the numerical simulation model is established and its feasibility is validated . at last , the possibility of establishing a kind of calculation and design methods of fatigue life in submarine structure is primarily analyzed
本文把疲劳裂纹闭合模型通过切片合成法引入到潜艇结构疲劳强度计算上来，建立了潜艇结构疲劳强度的数字仿真计算的数学模型，分析该方法在潜艇结构疲劳强度计算上应用的可行性，为建立一套计算和设计潜艇结构疲劳强度的方法作了初步的探讨。 |
| 10. | The opening stress and the life of crack growth is calculated and compared with the test results and the experience formula . the feasibility of the newman theory of opening stress used in the high strength steel is validated . then through the slice synthesis method , the three dimension surface crack of the weld joint of cone - cylinder is decomposed into many plane through cracks
本文将基于裂纹闭合现象建立的带状屈服模型，用在平面贯穿裂纹中，计算此时的裂纹张开应力和疲劳裂纹扩展寿命，与试验结果和经验公式比较，验证newman裂纹张开应力理论在高强钢中的可行性；然后，用切片合成法，把潜艇结构凸锥柱结合壳焊缝处的三维表面裂纹分解成平面贯穿裂纹，用带状屈服模型的理论来分析平面贯穿裂纹，得到裂纹沿深度方向的扩展速率，进而得到潜艇结构的疲劳寿命。 |
