engineering recuitment HPCL Engineer Mock Test 2024 Mechanical Vibrations Undamped Free Vibration Resonance and Whirling
According to Dunkerley’s empirical equation, the frequency of the transverse vibration of the system of several loads attached to the same shaft is
1
\(\frac{{1}}{{f_n}}=\frac{{1}}{{f_{n_1}}}~+~\frac{{1}}{{f_{n_2}}}~+~\frac{{1}}{{f_{n_3}}}~+~...+\;\frac{{1}}{{f_{n_s}}}\)
2
\(\frac{{1}}{{f_n^2}}=\frac{{1}}{{f_{n_1}^2}}~+~\frac{{1}}{{f_{n_2}^2}}~+~\frac{{1}}{{f_{n_3}^2}}~+~...+\;\frac{{1}}{{f_{n_s}^2}}\)
3
\(f_{n} =f_{n_1}+f_{n_2}+f_{n_3}+.....+f_{n_s}\)
4
None of the above