液压能源系统振动引起的管路失效问题突出,严重威胁飞机液压系统的可靠性。为了深入研究液压系统振动特性的优化控制,考虑了频率相关摩擦模型的传递矩阵法计算流体管路的频率特性,同时采用面向对象的编程思想,在Visual Studio 2010/MFC软件开发平台上,自编基于流程图的飞机液压能源系统振动特性仿真软件(HCAD-1.0),为液压系统振动特性分析提供了方便、快捷的途径。对国内某型飞机液压能源系统振动特性进行仿真对比分析,结果验证了缓冲瓶和支管对压力脉动的优化控制作用,为液压能源系统振动特性优化控制提供了科学依据。
A method for encoding and compressing finite element models is proposed. Themodel may be various non-simple topological structures and contain any combinations of beams,triangular elements and quadrilateral elements. First the model is subdivided into simple meshesthat are orientable and manifold. Based on the Edgebreaker algorithm, 13 labelled pairs areintroduced for quadrilateral meshes and five other labelled pairs are introduced for triangles. Thenthe connectivity information of mixed triangle/quadrilateral meshes is coded in a direct manner.Two other bits are used to record the wireframe information. For the pure wireframe model, Taubin'smethod is extended to compress it. The compression algorithm is implemented and evaluated.Experiments with several models show that the method achieves excellent compression ratios.
文章采用孔挤压的修理工艺,对材料为30Cr Mn Si Ni2A结构的模拟试件进行处理,使孔表面产生一定的残余应力。对未处理的30Cr Mn Si Ni2A试件和处理后的试件进行疲劳试验,对比疲劳寿命及裂纹扩展速率,研究孔挤压对30Cr Mn Si Ni2A疲劳性能的影响。结果证明经过孔挤压强化后试件的疲劳寿命比未处理的试件增加了47%。
