tailieunhanh - WIND TUNNELS Part 9

Tham khảo tài liệu 'wind tunnels part 9', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Flow Visualization and Proper Orthogonal Decomposition of Aeroelastic Phenomena 103 Mode 4 a Test 1 b Test 2 c Test 3 d Test 4 Fig. 17. Vector plots of the fourth mode shape for the four different tests relative importance changes between tests. This phenomenon may provide justification for the assertion presented here concerning the higher modes . that modes higher than 3 represent transitional effects. 5. Conclusions The feasibility of applying Proper Orthogonal Decomposition to experimentally measured flows around vibrating structures has been demonstrated. It has been shown that this type of decomposition analysis can provide some very interesting data about the observed flows such as the dominant mode shapes and frequencies. Furthermore it was shown that structural vibrations can be detected by the POD procedure applied on PIV flow visualization data using an output-only approach. By considering the cylinder structural response as a forcing function it is possible to create input-output POD models whereby the generalized coordinates can be obtained from Frequency Response Functions relating the cylinder displacement response to the generalized coordinates themselves. It is shown that such FRFs feature two main frequency components the mean flow frequency . 0Hz and the vortex shedding frequency. Therefore they are independent of the structural response frequency. 104 Wind Tunnels 6. References Cipolla K. M. Liakopoulos A. Rockwell D. 1998 . Quantitative imaging in proper orthogonal decomposition of flow past a delta wing AIAA Journal 36 7 1247-1255. Dowell E. H. Hall K. C. Romanowski M. C. 1998 . Eigenmode analysis in unsteady aerodynamics Reduced order models Applied Mechanics Reviews 50 6 371-385. Hall K. C. 1994 . Eigenanalysis of unsteady flows about airfoils cascades and wings AIAA Journal 32 12 2426-2432. Kim Y. Rockwell D. Liakopoulos A. 2005 . Vortex buffeting of aircraft tail Interpretation via proper orthogonal decomposition AIAA Journal 43 3 .

TỪ KHÓA LIÊN QUAN
crossorigin="anonymous">
Đã phát hiện trình chặn quảng cáo AdBlock
Trang web này phụ thuộc vào doanh thu từ số lần hiển thị quảng cáo để tồn tại. Vui lòng tắt trình chặn quảng cáo của bạn hoặc tạm dừng tính năng chặn quảng cáo cho trang web này.