| 1. | The disadvantageous effect should be considered when the deflection between the structural mass center and stiffness center exists
摘要结构刚度中心与质量中心偏差较大时，应考虑扭转的不利影响，将高层建筑结构等效为悬臂杆，从顶至底依次选取脱离体。 |
| 2. | In the second optimization model , the first mode frequency is decreased to let it below the frequency of brunt load and cut down greatly the structural mass
在第二个优化模型中，考虑减小泵车的一阶频率，尽量低于油缸冲击载荷的频率，同时可使结构质量有较大幅度下降。 |
| 3. | The structural optimization based on noise attenuation is studied , in which the thickness of each link is taken as the design variable , and the weighting sum of structural mass and measure of the structural acoustic performance is taken as the synthesis performance index
选取机构杆件厚度为设计变量，以机构质量和声辐射性能量度的加权和为目标函数，应用改进了的变尺度优化算法对优化问题进行了求解。 |
| 4. | On the basis of the study of the characteristics of diffracted wave produced during the vibration propagation along the fissures , in association with practical example , the paper introduces the features of prospecting the depth of fissures of structural mass by using the seismic method
该文在研究振动沿裂缝传播时所产生绕射波的特征基础上，结合实例，介绍了运用地震法探测结构体裂缝深度的方法特点。 |
| 5. | Abstract : on the basis of the study of the characteristics of diffracted wave produced during the vibration propagation along the fissures , in association with practical example , the paper introduces the features of prospecting the depth of fissures of structural mass by using the seismic method
文摘:该文在研究振动沿裂缝传播时所产生绕射波的特征基础上，结合实例，介绍了运用地震法探测结构体裂缝深度的方法特点。 |
| 6. | The structural optimization based on noise attenuation is studied , in which the thickness of each link is taken as the design variable , and the weighting sum of structural mass and measure of the structural acoustic performance is taken as the synthesis performance index
采用结构优化的方法对机构声辐射控制问题进行了研究。选取机构杆件厚度为设计变量，以机构质量和声辐射性能量度的加权和为目标函数，应用改进了的变尺度优化算法对优化问题进行了求解。 |
| 7. | In upper level optimization , the thickness and geometry factors of composite skins and webs as well as other structural dimensions are taken as design variables . then , considering the behavior constraints and the side constraints , the structural mass is minimized by the mathematical programming technique . in lower level optimization , the mathematical programming technique or the genetic algorithm ( ga ) is used to search the practical stacking sequence of composite skins and webs to realize the given thickness and geometry factors from upper level optimization
底层优化设西北工业大学博士学位论文计以复合材料蒙皮和腹板等层合板各分层的厚度(或铺层数) 、铺层角和铺层顺序为设计变量，以层合板的几何因子与顶层优化设计给出的最优几何因子之间的误差最小为目标，考虑层合板厚度和制造工艺性约束，采用数学规划方法或遗传算法( geneticalgorithm ，简称ga )求出底层最优设计变量。 |
