tailieunhanh - Handbook of Industrial Automation - Richard L. Shell and Ernest L. Hall Part 3

Tham khảo tài liệu 'handbook of industrial automation - richard l. shell and ernest l. hall part 3', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | and becomes - Ề - -l dx or dv f- V 1 dx This is a first-order linear equation for which we have a general formula for the solution. We have here P x 1 and Q x 1. Hence y 1 V e ex dx c - V 1 1 1 Ce x y V 1 y 1 Ce-X ex c Cf-xfi- 12 1 ax and y 2 X c2 If p 1 - V .VC - 1 dx and if X 0 y Cje- 2 2 X c2 If X 0 y -Ci e x2 2 X c2 Independent Variable Absent The procedure is to take y to be the independent variable and let y be the new dependent variable. Dependent Variable Absent Example 8 xy 2 _ k 1 0 The dependent variable y is absent. Let p y then p y and the equation becomes xp x2 - l p - 1 0 p X 0 p -1 dp A X---I dx 0 X p X - Ỉ 0 or p 1 X In p 11 In x c m ị c I x 2 f c x fi 2 where Cj 0 x p - 1 C xc If p 1. ặ Cj x e p 2 1 dx If X 0 y y X c2 If X 0 Example 9. yy y Ỷ 1 0. Let y p. Then dp _dp dy _ dp dx dy dx dy The equation becomes dp 2 yp i . p1 1 0 dy dp 1 p 0 dy p dp dy 0 p Vp y pdp dy_ f . p 1 y lln p2 1 In 1 1 c ln 2 1 In y2 c ln 2 l 2 c 1 fli y r2 - ị - - y where K ec 0 y2 y2 p yK - y2 dx p y dx - K - y2 1 2 X c Copyright 2000 Marcel Dekker Inc. K y2 x C 2 I 2 K x C 2 In the preceding pages we have given a sampling of the many ingenious techniques which have been developed to study particular classes of first-order differential equations. More complete discussions including extensions of the techniques we have described and other techniques can be found in standard textbooks. There is an excellent discussion in Ref. 5 Chap. 1. Very extensive and thorough treatments are given in Refs 68. Each of these references presents a large number of ordinary differential equations and then solutions. Reference 8 is a more extensive compilation than Refs 6 or 7 but Refs 6 and 7 contain more theory and references. Figure 1 A GEOMETRICAL APPROACH We have been describing methods for obtaining explicit formulas for solutions of differential equations. There are however other ways of obtaining useful information about solutions. A geometrical approach yields a .

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.