9. Fourier Integrals
Fourier Integrals are essential for handling non-periodic functions in engineering applications, particularly in Civil Engineering contexts. This chapter discusses the derivation of Fourier Integrals, their formulas, applications in various engineering problems, and how they differ from Fourier Series. Key concepts include the properties of the Fourier Transform and the significance of Fourier Integrals in solving heat conduction and vibration problems, making it critical for understanding transient phenomena.
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What we have learnt
- Fourier Integrals extend the Fourier Series to non-periodic functions.
- A function must be piecewise continuous and absolutely integrable for Fourier Integral representation.
- Fourier Integrals are used in various civil engineering applications, including heat conduction and vibration analysis.
Key Concepts
- -- Fourier Integral
- A mathematical representation that expresses a non-periodic function as a continuous superposition of sine and cosine functions.
- -- Fourier Transform
- The process of converting a function into its frequency components, often expressed in complex form for simplification.
- -- Dirichlet Conditions
- Conditions that a function must satisfy to ensure convergence of its Fourier series and integrals, including piecewise continuity and absolute integrability.
- -- Parseval's Theorem
- A theorem that relates the energy of a signal in the time domain to that in the frequency domain.
- -- Heat Kernel
- The fundamental solution to the heat equation, illustrating how temperature diffuses through materials.
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