An electric motor, of mass (m=100 mathrm{~kg}) and operating speed (=1800 mathrm{rpm}), is fixed at the middle
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An electric motor, of mass \(m=100 \mathrm{~kg}\) and operating speed \(=1800 \mathrm{rpm}\), is fixed at the middle of a clamped-clamped steel beam of rectangular cross section, as shown in Fig. 12.32. Design the beam such that the natural frequency of the system exceeds the operating speed of the motor.
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