Explain what do we mean by free,forced and resonant vibrations, with examales of each
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Answer:
Explanation:
Limit state design (LSD), also known as load and resistance factor design (LRFD), refers to a design method used in structural engineering. A limit state is a condition of a structure beyond which it no longer fulfills the relevant design criteria.[1] The condition may refer to a degree of loading or other actions on the structure, while the criteria refer to structural integrity, fitness for use, durability or other design requirements. A structure designed by LSD is proportioned to sustain all actions likely to occur during its design life, and to remain fit for use, with an appropriate level of reliability for each limit state. Building codes based on LSD implicitly define the appropriate levels of reliability by their prescriptions.
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Forced vibrations occur when the object is forced to vibrate at a particular frequency by a periodic input of force. Objects which are free to vibrate will have one or more natural frequency at which they vibrate, ... The amplitude of the resonance peak decreases and the peak occurs at a lower frequency.