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Question 1
Please give the mathematical formula of the following concepts.
(a) Damped natural frequency of a SDOF system in terms of undamped frequency and
damping ratio;
(b) Critical damping of a damped SDOF system;
(c) Unit impulse response function h(t-r) of a SDOF damped system;
(d) Duhamel integral of a damped SDOF system;

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