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New Trends and Developments in Automotive System Engineering Part 16

Tham khảo tài liệu 'new trends and developments in automotive system engineering part 16', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 588 New Trends and Developments in Automotive System Engineering geometry. A sphere of radius R 0.5 m is excited at a frequency f 300 MHz by a vertical electric dipole located at h 0.02 m above the sphere surface to create a highly inhomogeneous incident near field. Fig. 2 illustrates a large advantage of the obtained adaptive meshes compared to the uniform mesh. Starting with a uniform mesh of 1 620 triangles and BCP errors of SE 55.4 and SH 21.8 at the 2-nd iteration we obtain a mesh with 1 910 triangles and BCP errors of SE 17.40 and SH 11.1 . The same accuracy may be provided by a uniform mesh with 20 170 triangles for BCP-E and 20 720 triangles for BCP-H . Compared to these uniform meshes the calculation time for matrix inversion is lower by a factor of Ge 1 178 and Gh 1 277. Fig. 2. Total BCP errors on a sphere surface for the uniform and adaptive meshes Fig. 3 shows the adaptive meshes obtained for both closed sphere and open square plate geometries. The adaptive sphere mesh obtained at the 3-rd iteration consists of 2 342 triangles and is characterized by BCP errors SE 10.7 and SH 9.8 . Such accuracy cannot be achieved by any uniform mesh with less than 25 000 triangles. For the open geometry 1-m plate is excited by a normally incident plane wave at frequency f 300MHz. The adaptive plate mesh obtained at the 2nd iteration from an initial uniform mesh of 1 800 triangles consists of 3 385 triangles and is characterized by the BCP errors SE 8.0 and SH 7.4 . Such accuracy cannot be achieved by a uniform mesh with less than 10 000 triangles. b gagas SBgagaBsgBHBHsgaga SgEgBgEgEgBgBgaga gBgBgBgEgBgagSgBg agEgBg0gBgBg0gEga gBgEgESEgBgESsgBg EgagBg gsgBgggEgag 535353535353535353 Ả SaaBaE hEhBh i sagaii BhES f. BSaaa BhBSBSS BSBSSSBS k hBhBh 0BhBhE000BhB00hBh agagi sgBgEgEgBgagBgagEg HSgag sEgBgBSEgEgBsSHEgr BgBga BgBgaSsgBgBgagBgBg 3535353535353 asESsgagr 5353535353535 SEgEgBgl iagBgBHBgBgBgE -- - BgagSHigBiagag jSBgBgaSBSaSBSa agagiSagagBSig sõãặõSõããSõậõ .