tailieunhanh - Standard Handbook of Machine Design P7

CHAPTER 5 COMPUTATIONAL CONSIDERATIONS Charles R. Mischke, ., RE. Professor Emeritus of Mechanical Engineering Iowa State University Ames, Iowa INTRODUCTION / AN ALGORITHMIC APPROACH TO DESIGN / ANALYSIS TASKS / MATHEMATICAL TASKS / STATISTICAL TASKS / OPTIMIZATION TASKS / SIMULATION / REFERENCES / NOMENCLATURE a A allow b B c C d dhole drod D e E fom f(x) F FI Fs Range number Spring wire strength constant, cross-sectional area, Jacobian matrix Diametral allowance Range number Bushing diameter Distance to outer fiber, radial clearance Spring index Did Wire diameter Hole. | CHAPTER 5 COMPUTATIONAL CONSIDERATIONS Charles R. Mischke . . Professor Emeritus of Mechanical Engineering Iowa State University Ames Iowa INTRODUCTION AN ALGORITHMIC APPROACH TO DESIGN I ANALYSIS TASKS I MATHEMATICAL TASKS STATISTICAL TASKS OPTIMIZATION TASKS SIMULATION I REFERENCES NOMENCLATURE a A allow b B Range number Spring wire strength constant cross-sectional area Jacobian matrix Diametral allowance Range number Bushing diameter c C d hole drod D Distance to outer fiber radial clearance Spring index Did Wire diameter Hole diameter Rod diameter Helix diameter journal diameter e E fom f x F F Fs Eccentricity Young s modulus Figure of merit Function Spring force cumulative distribution function function Spring working load Spring load at closure soliding STANDARD HANDBOOK OF MACHINE DESIGN G Shear modulus h Ordinate spacing in Simpson s rule i Subscript k Spring rate successive substitution convergence parameter Length o Free length j Solid length L Length Lo Free length Ls Solid length m Spring wire strength parameter n Number factor of safety ns Factor of safety at soliding N Normal or gaussian distributed N Number of turns Na Number of active turns N Total number of turns OD Outside diameter of spring coil p Probability P Load probability Q Spring dead coil correction Q Spring dead coil correction for solid height r Residual radius R Richardson s correction to Simpson s first rule estimate Sut Engineering ultimate tensile strength Ssu Engineering ultimate shear strength Sy Engineering percent yield strength in tension Sv Engineering percent yield strength in shear u Uniform random number U Uniform distributed W Weibull distributed x Variable y Variable end contraction of a spring z deviation in 7V 0 1 y Weight density T Factor of safety 0 Weibull characteristic parameter angle i Population mean E Fractional overrun to closure ys yi yi p Link length COMPUTATIONAL .