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down force

Engenharia Mecânica
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Contexto: "The results further provide an insight into the differences between high-speed cars effected by aerodynamics and low-speed cars where aerodynamics makes little or no difference to performance (1). Formula One cars are the fastest road course racing cars in the world due to very high cornering speeds and amounts of aero dynamic down force. Currently, Formula one car race at speeds of up to 360 km/h (220 mph) with engines, limited in performance to a maximum of 15,000 RPM. The cars are capable of lateral acceler ation in excess of five ‘G’ in corners. The performance of the cars is very dependent on electronics control and other driving on aerody namics, suspension and tyres."
Fonte: References (1) D. Andrew, C. David, Fundamental parameter design issues which determine race car performance, in: Proceedings of the SAE Motorsports Engineering Conference & Exposition, Dearborn, Michigan, 2000, p. 361. (2) D. Hull, A unified approach to progressive crushing of fibre reinforced composite tubes, Compos. Sci. Technol. 40 (1991) 377–421. (3) G.L. Farley, R.M. Jones, Crushing characteristics of continuous fiber-reinforced composite tubes, J. Compos. Mater 26 (1992) 37–50. (4) H. Saito, E.C. Chirwa, R. Inai, H. Hamada, Energy absorption of braiding pultrusion process composite rods, Compos. Struct. 55 (2002) 407–417. (5) E. Mahdi, A.M.S. Hamouda, B.B. Sahari, Y.A. Khalid, Effect of material and geometry on crushing behavior of laminated conical composite shells, Appl. Compos. Mater. 9 (2002) 265–290. composite tubes: experimental, Compos. Struct 63 (2004) 347–360. (7) C.M. Kindervater, A.F. Johnson, D.L. Kohlgrüber, M. Eutzenburger, N. Pentecote, Crash and impact simulation of aircraft structures-hybrid and FE based approaches, in: Proceedings of the European Congress on Computational Methods in Applied Sciences and Engineering, 2000, pp. 1–24. (8) S.J. Beard, F.K. Chang, Energy absorption of braided composite tubes, Int. J. Crashworthiness 7 (2002) 191–206. (9) A.N. Mellor, Impact testing in formula one, Int. J. Crashworthiness 7 (2002) 475–486. (10) Krzysztof Wloch, Peter J. Bentley, Optimising the performance of a formula one car using genetic algorithm, International Conference on Parallel Problem Solving from Nature- PPSN VIII (2004) 702-711. (11) Emre Kazancioglu, Guangquan Wu, Jeonghan Ko, Stanislav Bohac, Zoran Filipi, S. Jack Hu, Dennis Assanis, Kazuhiro Saitou, Robust optimization of an automobile valve train using a multi objective genetic algorithm. Proc. of ASME 2003 Design Engineering Technical Conferences Chicago (2003) Illinois. (12) J.P. Leiva, L. Wang, S. Recek, B. Watson, Advances in optimization tecnologies for product design, in: Automobile Design Using the GENESIS Structural Optimization Program, Na fems Seminar, Chicago, USA, 2001, pp. 22–23. (13) P.J. Bentley, J.P. Wakefield, Generic evolutionary design, in: P.K. Chawdhry, R. Roy, R.K. Pant (Eds.), Soft Computing in Engineering Design and Manufacturing, Springer Verlag London Limited, 1997, pp. 289–298, Part 6.

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Definição: "The effect of mechanical process parameters such as down force and rotation speed on friction behavior and material removal rate (MRR) was investigated during chemical mechanical polishing (CMP) of sapphire substrate. It was found that the increase in both rotation speed and down force can enhance the MRR and friction force almost linearly depends on the down force and rotation speed. The coefficient of friction (COF) decreases with increasing rotation speed under a fixed down force but keeps constant regardless of variation in down force under a fixed rotation speed. Moreover, the relationship between friction force and MRR was obtained. MRR was proportional to friction force with increasing down force whereas converse proportional to that with increasing the rotation speed. In addition, MRR data are fitted to the Preston equation in the sapphire CMP."
Fonte: References (1) H.L. Zhu, L.A. Tessaroto, R. Sabia, V.A. Greenhut, M. Smith, D.E. Niesz Appl. Surf. Sci., 236 (2004), pp. 120-130 ArticleDownload PDFView Record in Scopus (2) X. Hu, Z. Song, Z. Pan, W. Liu, L. Wu Appl. Surf. Sci., 255 (2009), pp. 8230-8234 ArticleDownload PDFView Record in Scopus (3) S. Zhou, S. Liu Appl. Surf. Sci., 255 (2009), pp. 9469-9473 ArticleDownload PDFView Record in Scopus (4) X.H. Niu, Y.L. Liu, B.M. Tan, L.Y. Han, J.X. Zhang, J.X. Zhang Trans. Nonferr. Metal. Soc., 16 (2006), pp. S732-S734 (5) Y.Z. Wang, S.L. Liu, G.L. Peng, S.M. Zhou, J. Xu J. Cryst. Growth, 274 (2005), pp. 241-245 ArticleDownload PDF (6) H.L. Zhu, D.E. Niesz, V.A. Greenhut, R. Sabia J. Mater. Res., 20 (2005), pp. 504-520 View Record in Scopus (7) L.Y. Wang, K.L. Zhang, Z.T. Song, S.L. Feng J. Electrochem. Soc., 154 (2007), pp. H166-H169 View PDFCrossRefView Record in Scopus (8) Z. Zhang, L. Yu, W. Liu, Z. Song Appl. Surf. Sci., 256 (2010), pp. 3856-3861 ArticleDownload PDFView Record in Scopus (9) Z. Zhang, W. Liu, Z. Song Microelectron. Eng., 87 (2010), pp. 2168-2172 ArticleDownload PDFView Record in Scopus (10) A. Philipossian, S. Olsen Jpn. J. Appl. Phys., 42 (2003), pp. 6371-6379 View Record in Scopus (11) W.J. Patrick, W.L. Guthrie, C.L. Standley, P.M. Schiable J. Electrochem. Soc., 138 (1991), pp. 1778-1784 View PDFCrossRefView Record in Scopus (12) Y. Homma, K. Fukushima, S. Kondo, N. Sakuma J. Electrochem. Soc., 150 (2003), pp. G751-G757 View Record in Scopus (13) A.K. Sikder, F. Giglio, J. Wood, A. Kumar, M. Anthony J. Electron. Mater., 30 (2001), pp. 1520-1526 View PDFCrossRefView Record in Scopus (14) B. Park, H. Lee, Y. Kim, H. Kim, H. Jeong Jpn. J. Appl. Phys., 47 (2008), pp. 8771-8778 View Record in Scopus (15) N. Belkhir, D. Bouzid, V. Herold Tri. Lett., 33 (2009), pp. 55-61 View PDFCrossRefView Record in Scopus (16) W.-T. Tseng, J.-H. Chin, L.-C. Kang J. Electrochem. Soc., 146 (1999), pp. 1952-1959 View Record in Scopus (17) S.R. Runnels, L.M. Eyman J. Electrochem. Soc., 141 (1994), pp. 1698-1701 View PDFCrossRefView Record in Scopus (18) Z.F. Zhang, H. Lei Microelectron. Eng., 85 (2008), pp. 714-720 ArticleDownload PDFView Record in Scopus (19) F.W. Preston J. Soc. Glass Tech., 11 (1927), pp. 214-247

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