8. Response to Harmonic Excitation
The chapter explores the response of structures to harmonic excitation, focusing on linear systems governed by differential equations. It discusses both undamped and damped systems, introducing concepts such as the steady-state response, quality factor, resonance, and transmissibility, with practical applications in earthquake engineering. The analysis of multi-degree-of-freedom systems and the importance of damping for controlling vibrations are also highlighted, along with modern design considerations and computational tools.
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What we have learnt
- Understanding harmonic excitation is crucial for the analysis of dynamic behavior in structures.
- Both undamped and damped systems respond differently to harmonic forces, affecting their stability.
- Damping plays a key role in reducing amplification of vibrations and stabilizing structural responses under dynamic loads.
Key Concepts
- -- Harmonic Excitation
- A type of periodic force that varies sinusoidally with time, essential for analyzing dynamic responses of structures.
- -- Transmissibility
- The ratio of output to input amplitude in terms of force or displacement, important for vibration isolation.
- -- Quality Factor (Q)
- A measure of the sharpness of the resonance peak of a system, indicating damping levels.
- -- Resonance
- The phenomenon where the forcing frequency matches the system’s natural frequency, potentially causing large amplitude vibrations.
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