由路面引起的汽车振动能量耗散特性频域分析

针对行驶过程中由路面引起的汽车振动能量耗散问题，提出了基于汽车振动二自由度单轮模型的能量耗散特性频域分析方法。采用汽车振动二自由度单轮模型推导了模型的频率响应，确定了能量耗散振动响应量及其频率响应。将路面激励功率谱密度与振动响应量的功率谱密度和均方根值相结合，建立了能量耗散振动响应量统计特性和振动能量耗散平均功率的表示。采用Matlab开发了汽车振动二自由度单轮模型的能量耗散特性频域分析仿真程序，通过3种分析方案研究了由路面引起的汽车振动能量耗散特性。结果表明，汽车振动能量耗散平均功率与速度和路面等级相关，受到路面等级的影响较大；在以B级路面为主的国内城市行驶工况下，由路面引起的汽车振动能量耗散平均功率比较低。     

Improving the fatigue life of large offshore foundations

Offshore foundations are subject to fatigue due to wind and wave loads during their lifetime. Post-weld treatment is a group of techniques well known to improve the fatigue life. This study investigates how this is applicable for large structures, i.e. a 2.4 meter jacket T-node. A large scale empirical study was performed and results were obtained from a SN-diagram based on three repetitions and supported by a theoretical background. The as welded samples performed as expected and on the safe side of the category 56 line. Unexpectedly, the burr grinded samples showed no improvement and had an evidently larger variance. Both ultrasonic impact treatment and especially pneumatic impact treatment showed improvements, but did not reach the expected category 125 line. The results were substantiated with strain-gauge measurements for hot spot analysis. The obtained results on fatigue life improvements give rise to apply post weld treatment in an industrial scale for offshore construction. However, it also brings up the discussion of the necessity to redesign structures in order to automate the treatment in a cost efficient manner.     

基于AVEVA Marine二次开发的舱室绝缘快速建模方法

为提升三维环境舱室绝缘的建模效率，提出舱室曲面绝缘及型材绝缘快速建模的二次开发方法，基于造船及海工设计系统(AVEVA Marine, AM)平台，运用可编程宏语言(PML)进行二次开发，通过拾取模型计算三维坐标点，简化重复性建模工作和操作流程，实现绝缘快速建模，方便设计人员使用。通过开发的绝缘快速建模功能与原生建模功能的对比，验证二次开发的高效性。     

试验水池造流剖面数值仿真

为评估试验水池造流剖面流速分布，采用计算流体力学(CFD)软件对试验水池主体的造流剖面进行二维模拟和三维模拟。结果显示，射流倾角与流道高度对试验区水流流态具有关键性的影响。分层开启流道和不同流量配比工况可分段满足工艺指标要求的流切变，且横向水流的偏差不大于10.0%。二维模拟和三维模拟的结果存在一定差异，但整体趋势基本相同。因此，二维模拟可用于前期方案优化。