飞机疲劳试验工程优化方法

相关系数法是一种有效的飞机疲劳试验载荷处理方法。通过对某型飞机后机身设计弯矩图和试验弯矩图的比较 ,说明了这一方法的工程合理性     

民机复材机翼项目准全尺寸盒段静力试验成功

民机复材机翼项目准全尺寸盒段静力试验2．5G工况破坏试验在中航工业飞机强度研究所长安基地取得成功。 该试验是“民用飞机复合材料机翼基础和关键技术研究项目”中l项标志性试验,也是复合材料机翼积木式验证中的最后一环。试验的圆满完成,标志着强度所在民机复合材料机翼试验验证方法上完成了1次新的探索,为复合材料在民机主承力结构上的应用提供了重要的技术支持。     

Dynamic assets allocation based on market microstructure model with variable-intensity jumps简

In order to characterizc large fluctuations of the financial markets and optimize financial portfolio, a new dynamic asset control strategy was proposed in this work. Firstly, a random process item with variable jump intensity was introduced to the existing discrete microstructure model to denote large price fluctuations. The nonparametric method of LEE was used for detecting jumps. Further, the extended Kalman filter and the maximum likelihood method were applied to discrete microstructure modeling and the estimation of two market potential variables： market excess demand and liquidity. At last, based on the estimated variables, an assets allocation strategy using evolutionary algorithm was designed to control the weight of each asset dynamically. Case studies on IBM Stock show that jumps with variable intensity are detected successfully, and the assets allocation strategy may effectively keep the total assets growth or prevent assets loss at the stochastic financial market.