7. Free Vibration of Single Degree of Freedom (SDOF) System
The chapter provides a comprehensive overview of the Free Vibration of Single Degree of Freedom (SDOF) systems, emphasizing foundational concepts such as the definition and equations of motion, solutions to these equations, natural frequency, and the impacts of mass and stiffness on vibration behavior. It also explores real-world applications in earthquake engineering and the significance of understanding both undamped and damped systems in structural design.
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What we have learnt
- Free vibration occurs without external forces after initial disturbance, governed by the mass-spring system dynamics.
- Natural frequency and time period are fundamental properties influencing system oscillation in free vibration.
- Real-world structures often experience damping, which alters vibration behavior critical to earthquake-resistant design.
Key Concepts
- -- Free Vibration
- The motion of a mechanical system allowed to vibrate naturally after an initial disturbance, without external forces.
- -- Natural Frequency
- The frequency at which a system naturally oscillates, determined by the mass and stiffness in an SDOF system.
- -- Damping
- The effect of energy dissipation in a system that leads to a decrease in the amplitude of oscillation.
- -- Resonance
- A phenomenon where a system vibrates with maximum amplitude at its natural frequency, often resulting in structural failure.
- -- Logarithmic Decrement
- A measure of damping in systems that quantifies the rate of amplitude decay over time.
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