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Mathematics Undergraduate

画像の4.2の問題の解き方を教えてください。

106 K M X(T) M. F sin (NT) (1)X 100 -100 ( XImax 80 0 0 4 Dimensional Scaling Analysis + KX = F sin (2T), X(0) = Xo, 1 n 2 10 T 3 Fig. 4.1 The elementary problem of a mass on spring with an applied force: (Left) dimensional parameters, (Right) solutions X(T) for various parameters and (Inset) the amplitude in relation to the forcing frequency ada 4.2 The governing equation for the linear mass-spring system shown in Fig. 4.1 is d²X dT² dX dT\T=0 20 = Vo, where X(T) [m] is the position of the mass as a function of time with mass M [kg], and spring coefficient K [N/m], magnitude of the applied force, F [N], forcing frequency, 2 [s], as well as general initial conditions, Nondimensionalize and select length- and time-scales L, T to normalise the coef- ficients of the terms on the left side of the ODE and the initial condition for position. Write and solve the scaled problem, and identify the dimensionless parameter for the ratio of the forcing frequency to resonant frequency, where the solution's amplitude grows without bound, as shown for 22 in Fig. 4.1. 4.3 Consider the initial value problem for a damped driven nonlinear oscillator:
Unresolved Answers: 0
Mathematics Undergraduate

画像の問題を教えてください！

106 K M X(T) M. F sin (NT) (1)X 100 -100 ( XImax 80 0 0 4 Dimensional Scaling Analysis + KX = F sin (2T), X(0) = Xo, 1 n 2 10 T 3 Fig. 4.1 The elementary problem of a mass on spring with an applied force: (Left) dimensional parameters, (Right) solutions X(T) for various parameters and (Inset) the amplitude in relation to the forcing frequency ada 4.2 The governing equation for the linear mass-spring system shown in Fig. 4.1 is d²X dT² dX dT\T=0 20 = Vo, where X(T) [m] is the position of the mass as a function of time with mass M [kg], and spring coefficient K [N/m], magnitude of the applied force, F [N], forcing frequency, 2 [s], as well as general initial conditions, Nondimensionalize and select length- and time-scales L, T to normalise the coef- ficients of the terms on the left side of the ODE and the initial condition for position. Write and solve the scaled problem, and identify the dimensionless parameter for the ratio of the forcing frequency to resonant frequency, where the solution's amplitude grows without bound, as shown for 22 in Fig. 4.1. 4.3 Consider the initial value problem for a damped driven nonlinear oscillator:
Unresolved Answers: 0
Mathematics Undergraduate

波線を引いた式の導出がよく分かりません。u~²を展開して整理するとたしかに1-e²/2は出てくるのですが、eφsinφなどはどうしたら出てくるのでしょうか？

To see this, recall from Appendix C that the Newtonian orbit equation (d'u/dp?)+ u= M/L? has à = helion at p = 0. The hypotheses imply r> L»M SO this is close to the relativistic solution. To obtain a more refined approximation, we use ü in (M/L")(1 + e cos φ) as solution with peri- the relativistic correction term thus 代人 (d'u/dp?) + u = (M/L?) + 3Mz?. A routine computation gives 3m3 (1+e cos p)+ L e? e? 1+ 2 M cos 2p + ep Sin p 6 u= L? as the solution with perihelion at φ = 0. To find the next perihelion we need 3M°ele p+ L* du Me sin L? sin 2p + sinφ+p cos φ 3 dp

Resolved Answers: 1
Mathematics Undergraduate

2枚目にある2行目の「ここで(6.1.2)式は〜」のところと、次の段落の「さて今の場合〜」と書いてあるところがよくわかりません どなたか教えてください🙇‍♂️

系の運動を解くとは 万一0 となるよう なIT る. に 5.3 節で紹介した 記(9,選のり のタイ プの了母関数の場合 の条件は 9 EC NG り = (61.2) 目(5.3.18) 式よ り 刀"=0 2 が の7 > 9g!「 2 9た 2 と書ける. この式の解となる 瓦(9,選おは, ハミルトンの主関数(Hamilton's principal fanction) と呼ばれ, 9 と書かれることが多いので, 通常は (6.1.2) 式を 99 85 ーー INONまCN当 3 (< 8 り 0 (6.1.3) と書き, ハミルトン-ヤコビ方程式 (Hamilton-Jacobi equation) と呼ぶ. (6.1.3)5共は二91 NONSUNのODNGNAわ (だ 十1) 個の変数をもつ関数ぐに 対する 1 階偏微分方程式である. したがって, その人解は
Resolved Answers: 1
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