True or False and why a) If the time duration of a general loading, say a shock

Question

True or False and why

a) If the time duration of a general loading, say a shock load, is very small, Duhamel integral cannot be used to evaluate the response.

b) If a system is damped, a general periodic but non-harmonic input force cannot be modelled and represented by Fourier series for the response analysis.

c) Dynamic stresses in a beam under a harmonic load are more sever that dynamic stresses due to an impact load.

d) When a steel beam yield and becomes weaker the damping will decrease

e) For a damped system as the damping ratio increases, the free vibration response

shows a higher period.

f) For any type of harmonic load, the magnification factor for a SDOF system approaches zero as the frequency ratio becomes very large.

Explanation / Answer

(a)Answer:- False

Duhamel integral can be used to evaluate the response, if the time duration of general load is very small.

(b) Answer:- False

If a system is damped, a general periodic but non harmonic input force can be modelled and represented by Fourier series for the response analysis.

(c) Answer:- True

(d) Answer:- False

(e) Answer:- False

(f) Answer:- True  

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