Consider the dynamics of a rotating disk modeled as second-order system IÖ + b,ė +k,0 = u(t) with mass moment of inertia I = 0.025 kg/m², bearing friction br = 12 N-m/(rad/s), and torsional spring constant kr = 90 Nm/rad. The disk is driven by an oscillating torque input u(t) = P sin wt with magnitude P = 100 N-m at an input frequency of w = 10 rad/s. = • Derive an expression for the steady-state output Oss (t). Hint: first find the transfer function G(s) (s)/U(s) and then the sinusoidal transfer function G(iw) along with the gain |G(iw) and phase = LG(iw). The expression for the steady-state output in response to a sinusoidal input U(s) was derived in Lecture 18. • When is this steady-state output is achieved after the system is started from rest? Assume that transients have decayed after 4 time constants.

Elements Of Electromagnetics
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Consider the dynamics of a rotating disk modeled as second-order system
IÖ + b,ė +k,0 = u(t)
with mass moment of inertia I = 0.025 kg/m², bearing friction br = 12 N-m/(rad/s), and
torsional spring constant kr = 90 Nm/rad. The disk is driven by an oscillating torque input
u(t) = P sin wt with magnitude P = 100 N-m at an input frequency of w = 10 rad/s.
=
• Derive an expression for the steady-state output Oss (t). Hint: first find the transfer function
G(s) (s)/U(s) and then the sinusoidal transfer function G(iw) along with the gain
|G(iw) and phase = LG(iw). The expression for the steady-state output in response to
a sinusoidal input U(s) was derived in Lecture 18.
• When is this steady-state output is achieved after the system is started from rest? Assume
that transients have decayed after 4 time constants.
Transcribed Image Text:Consider the dynamics of a rotating disk modeled as second-order system IÖ + b,ė +k,0 = u(t) with mass moment of inertia I = 0.025 kg/m², bearing friction br = 12 N-m/(rad/s), and torsional spring constant kr = 90 Nm/rad. The disk is driven by an oscillating torque input u(t) = P sin wt with magnitude P = 100 N-m at an input frequency of w = 10 rad/s. = • Derive an expression for the steady-state output Oss (t). Hint: first find the transfer function G(s) (s)/U(s) and then the sinusoidal transfer function G(iw) along with the gain |G(iw) and phase = LG(iw). The expression for the steady-state output in response to a sinusoidal input U(s) was derived in Lecture 18. • When is this steady-state output is achieved after the system is started from rest? Assume that transients have decayed after 4 time constants.
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