The shape optimization is studied by adopting the domain integrated method which is based on the calculus of variations during the shape design sensitivity analysis. A new method of improving the efficiency of the de...The shape optimization is studied by adopting the domain integrated method which is based on the calculus of variations during the shape design sensitivity analysis. A new method of improving the efficiency of the design velocity field analysis and the quality of the finite element method (FEM) mesh is put forward. The sensitivity analysis which is based on the calculus of variations is used in the shape optimization. The design velocity field is solved by Herrmann method. An example shows that both the quality of the FEM mesh and the efficiency of the computing of the design velocity field are improved by Herrmann method. So the effect and the efficiency of the shape optimization are guaranteed. If using sensitivity analysis which is based on the calculus of variations in the shape optimization, the sensitivity analysis can be a relatively independent module. The efficiency of computing the design velocity field and the quality of mesh will be improved by using Herrmann method.展开更多
In the paper a little known large 4-folio map of the territory of the later US states Virginia and Maryland is introduced. The map, which was surveyed and composed between 1660 and 1670, is exceptional from several po...In the paper a little known large 4-folio map of the territory of the later US states Virginia and Maryland is introduced. The map, which was surveyed and composed between 1660 and 1670, is exceptional from several points of view: the vast impenetrable territory covering a strip of land of about 700 × 400 km was mapped by one man, Augustin Herrman “Bohemian” (as he called himself) and by his crew during 10-year surveying and trigonometric measurements. It seems that this extraordinary map belongs among the first geodetically surveyed maps of the American territory. In 1960 altogether 5 copies of the map, complete in four parts, were known in British, French and American Libraries and map collections.展开更多
文摘The shape optimization is studied by adopting the domain integrated method which is based on the calculus of variations during the shape design sensitivity analysis. A new method of improving the efficiency of the design velocity field analysis and the quality of the finite element method (FEM) mesh is put forward. The sensitivity analysis which is based on the calculus of variations is used in the shape optimization. The design velocity field is solved by Herrmann method. An example shows that both the quality of the FEM mesh and the efficiency of the computing of the design velocity field are improved by Herrmann method. So the effect and the efficiency of the shape optimization are guaranteed. If using sensitivity analysis which is based on the calculus of variations in the shape optimization, the sensitivity analysis can be a relatively independent module. The efficiency of computing the design velocity field and the quality of mesh will be improved by using Herrmann method.
文摘In the paper a little known large 4-folio map of the territory of the later US states Virginia and Maryland is introduced. The map, which was surveyed and composed between 1660 and 1670, is exceptional from several points of view: the vast impenetrable territory covering a strip of land of about 700 × 400 km was mapped by one man, Augustin Herrman “Bohemian” (as he called himself) and by his crew during 10-year surveying and trigonometric measurements. It seems that this extraordinary map belongs among the first geodetically surveyed maps of the American territory. In 1960 altogether 5 copies of the map, complete in four parts, were known in British, French and American Libraries and map collections.
