Question

The output from a model for the vibration of the tip of a beam is shown in the following figure. 0.8 0.6 0.4 0.2 -0.2 -0.4 0.
This behaviour can be reduced to an expression for the displacement as a function of time: 2(t) = e-kt cos(2nft), where k = 0
The output from a model for the vibration of the tip of a beam is shown in the following figure. 0.8 0.6 0.4 0.2 -0.2 -0.4 0.6 -0.8 10 time (s)
This behaviour can be reduced to an expression for the displacement as a function of time: 2(t) = e-kt cos(2nft), where k = 0.5 s-1 and f = 2 Hz. Calculate the values of t in the interval t = 0 to t = 1 for which the amplitude of z(t) is zero. Hint consider values at which a cosine function is zero and also consider whether the exponential function can be zero. (6 marks) b. Differentiate f(t) = e-kt and g(t) cos(2nft) with respect to t (4 marks) c. Differentiate the function z(t) to show that the expression for the velocity of the tip of the beam as a function of time can be written as u(t) =-e-kt (k cos(2nft) + 2r/ sin(2rft)) . (4 marks) d. Calculate the value of t after the start at which the velocity of the tip first becomes zero. Hint: the expression for velocity is given in question (c) and remember to consider again if the exponential function can be zero.) (4 marks) e. Calculate the value of t when f(t) = e-kt falls to 10% of its maximum value. (Hint: the maximum of f (t) is at t 0 and it is 1.) (2 marks)
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니 -kt 2.0.1283 -kヒ kヒ

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