Laplace Transform is a powerful mathematical tool used to solve differential equations. In this article, we will discuss how to solve a first-order linear ordinary differential equation using Laplace Transform.
Consider the following differential equation: dy/dt + 2y = 4t, where y(0) = 1. Our goal is to solve this equation using Laplace Transform.
Firstly, let’s transform the equation into the Laplace domain. The Laplace Transform of the derivative of a function is equal to the Laplace Transform of the function multiplied by s, where s is the complex frequency. Applying this rule, we get sY(s) – y(0) + 2Y(s) = 4/s^2, where Y(s) is the Laplace Transform of y(t).
Simplifying the equation, we have (s + 2)Y(s) = 1 + 4/s^2. Now, we solve for Y(s) by isolating it on one side of the equation. Dividing both sides by (s + 2), we get Y(s) = (1 + 4/s^2) / (s + 2).
With Y(s) obtained, we can now find the inverse Laplace Transform to convert it back to the time domain. The inverse Laplace Transform of Y(s) can be found using tables or by partial fraction decomposition. Doing the partial fraction decomposition, we get Y(s) = 1/(s + 2) + 4/s^2.
Using the inverse Laplace Transform table, we find that the inverse Laplace Transform of 1/(s + 2) is e^(-2t), and the inverse Laplace Transform of 4/s^2 is 2t. Therefore, the solution to the differential equation is y(t) = e^(-2t) + 2t.
In conclusion, using Laplace Transform, we were able to solve the given first-order linear ordinary differential equation. By transforming the equation into the Laplace domain, performing algebraic operations, and finding the inverse Laplace Transform, we obtained the solution y(t) = e^(-2t) + 2t. This problem demonstrates the application of Laplace Transform and reinforces the understanding of solving first-order differential equations. 拉普拉斯變換是一個強大的數學工具,用於解決微分方程。在本文中,我們將討論如何使用拉普拉斯變換解決一階線性常微分方程。
考慮以下微分方程:dy/dt + 2y = 4t,其中y(0) = 1。我們的目標是使用拉普拉斯變換解決這個方程。
首先,讓我們將方程轉換為拉普拉斯域。函數的導數的拉普拉斯變換等於該函數的拉普拉斯變換乘以s,其中s是複頻率。應用這個規則,我們得到sY(s) – y(0) + 2Y(s) = 4/s^2,其中Y(s)是y(t)的拉普拉斯變換。
簡化方程,我們得到(s + 2)Y(s) = 1 + 4/s^2。現在,我們通過將Y(s)從方程的一側分離來解出Y(s)。將兩側都除以(s + 2),我們得到Y(s) = (1 + 4/s^2)/(s + 2)。
獲得Y(s)後,我們可以找到逆拉普拉斯變換,將其轉換回時間域。可以使用表格或部分分式分解來找到Y(s)的逆拉普拉斯變換。通過部分分式分解,我們得到Y(s) = 1/(s + 2)+ 4/s^2。
使用逆拉普拉斯變換表格,我們發現1/(s + 2)的逆拉普拉斯變換是e^(-2t),而4/s^2的逆拉普拉斯變換是2t。因此,該微分方程的解為y(t) = e^(-2t) + 2t。
總之,使用拉普拉斯變換,我們能夠解決給定的一階線性常微分方程。通過將方程轉換為拉普拉斯域,進行代數運算,並找到逆拉普拉斯變換,我們獲得了解y(t) = e^(-2t) + 2t。這個問題展示了拉普拉斯變換的應用,並加深了對解一階微分方程的理解。
Laplace Transform is a powerful mathematical tool used to solve differential equations. In this article, we will discuss how to solve a first-order linear ordinary differential equation using Laplace Transform.
Consider the following differential equation: dy/dt + 2y = 4t, where y(0) = 1. Our goal is to solve this equation using Laplace Transform.
Firstly, let’s transform the equation into the Laplace domain. The Laplace Transform of the derivative of a function is equal to the Laplace Transform of the function multiplied by s, where s is the complex frequency. Applying this rule, we get sY(s) – y(0) + 2Y(s) = 4/s^2, where Y(s) is the Laplace Transform of y(t).
Simplifying the equation, we have (s + 2)Y(s) = 1 + 4/s^2. Now, we solve for Y(s) by isolating it on one side of the equation. Dividing both sides by (s + 2), we get Y(s) = (1 + 4/s^2) / (s + 2).
With Y(s) obtained, we can now find the inverse Laplace Transform to convert it back to the time domain. The inverse Laplace Transform of Y(s) can be found using tables or by partial fraction decomposition. Doing the partial fraction decomposition, we get Y(s) = 1/(s + 2) + 4/s^2.
Using the inverse Laplace Transform table, we find that the inverse Laplace Transform of 1/(s + 2) is e^(-2t), and the inverse Laplace Transform of 4/s^2 is 2t. Therefore, the solution to the differential equation is y(t) = e^(-2t) + 2t.
In conclusion, using Laplace Transform, we were able to solve the given first-order linear ordinary differential equation. By transforming the equation into the Laplace domain, performing algebraic operations, and finding the inverse Laplace Transform, we obtained the solution y(t) = e^(-2t) + 2t. This problem demonstrates the application of Laplace Transform and reinforces the understanding of solving first-order differential equations. 拉普拉斯變換是一個強大的數學工具,用於解決微分方程。在本文中,我們將討論如何使用拉普拉斯變換解決一階線性常微分方程。
考慮以下微分方程:dy/dt + 2y = 4t,其中y(0) = 1。我們的目標是使用拉普拉斯變換解決這個方程。
首先,讓我們將方程轉換為拉普拉斯域。函數的導數的拉普拉斯變換等於該函數的拉普拉斯變換乘以s,其中s是複頻率。應用這個規則,我們得到sY(s) – y(0) + 2Y(s) = 4/s^2,其中Y(s)是y(t)的拉普拉斯變換。
簡化方程,我們得到(s + 2)Y(s) = 1 + 4/s^2。現在,我們通過將Y(s)從方程的一側分離來解出Y(s)。將兩側都除以(s + 2),我們得到Y(s) = (1 + 4/s^2)/(s + 2)。
獲得Y(s)後,我們可以找到逆拉普拉斯變換,將其轉換回時間域。可以使用表格或部分分式分解來找到Y(s)的逆拉普拉斯變換。通過部分分式分解,我們得到Y(s) = 1/(s + 2)+ 4/s^2。
使用逆拉普拉斯變換表格,我們發現1/(s + 2)的逆拉普拉斯變換是e^(-2t),而4/s^2的逆拉普拉斯變換是2t。因此,該微分方程的解為y(t) = e^(-2t) + 2t。
總之,使用拉普拉斯變換,我們能夠解決給定的一階線性常微分方程。通過將方程轉換為拉普拉斯域,進行代數運算,並找到逆拉普拉斯變換,我們獲得了解y(t) = e^(-2t) + 2t。這個問題展示了拉普拉斯變換的應用,並加深了對解一階微分方程的理解。
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