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Sổ tay tiêu chuẩn thiết kế máy P14

Tham khảo tài liệu 'sổ tay tiêu chuẩn thiết kế máy p14', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | CHAPTER 11__ MINIMIZING ENGINEERING EFFORT Charles R. Mischke Ph.D. P.E. Professor Emeritus of Mechanical Engineering Iowa State University Ames Iowa 11.1 INTRODUCTION 11.2 11.2 REDUCING THE NUMBER OF EXPERIMENTS 11.3 11.3 SIMILITUDE 11.7 11.4 OPTIMALITY 11.9 11.5 QUADRATURE I 11.13 11.6 CHECKING 11.15 REFERENCES 11.21 NOMENCLATURE a Distance range number bilaterial tolerance b Width range number C Constant D Helix diameter dim Dimensional operator E Young s modulus En Error using n applications of Simpson s rule e The ith exponent f Function i The zth derivative of function f F Fundamental dimension of force fractional reduction of interval of uncertainty g Function h Function ordinate spacing i Index I Second area moment value of integral Approximate value of integral using i applications of Simpson s rule k Spring rate 11.1 11.2 STANDARD HANDBOOK OF MACHINE DESIGN K Exponent of fundamental dimension in row i of parameter j in dimensional matrix L Fundamental dimension of length Span left In Natural logarithm m Mass subscript of model n Number N Number of experiments to establish a robust functional relationship among n parameters number of function evaluations N Number of experiments to establish a robust functional relationship among dimensionless parameters Na Number of active turns in a spring N. Number of pi terms in a complete set p Number of points necessary to establish a robust functional relationship between two parameters P Load Q Fundamental dimension of charge r Rank of dimensional matrix right s Scale factor the ratio of model over prototype dimension T Fundamental dimension of time x Location parameter x Abscissa of extreme of a function xe xr Range numbers on left and right respectively y Transverse beam deflection A Tolerable error 0 Fundamental dimension of temperature n The th pi term Location in Simpson s rule application interval where error term is exact 11.1 INTRODUCTION The old carpenter s admonition Measure twice cut once reminds