Homework Set 4

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University of Florida *

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3344

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Mechanical Engineering

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Oct 30, 2023

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Problem Set 4 Problems Completed: 6.24, 8.3, 8.4, 8.10, 9.5, 9.6, S1
Problem 6.24 In control systems analysis, transfer functions are developed that mathematically relate the dynamics of a systems input to its output. A transfer function for a robotic positioning system is given by ?(𝑠) = ?(𝑠) 𝑁(𝑠) = 𝑠 3 + 9𝑠 2 + 26𝑠 + 24 𝑠 4 + 15𝑠 3 + 77𝑠 2 + 153𝑠 + 90 where G(s) = system gain, C(s) = system output, N(s) =system input, and s = Laplace transform complex frequency. Use MATLAB to find the roots of the numerator and denominator and factor these into the form ?(𝑠) = (𝑠 + ? 1 )(𝑠 + ? 2 )(𝑠 + ? 3 ) (𝑠 + ? 1 )(𝑠 + ? 2 )(𝑠 + ? 3 )(𝑠 + ? 4 ) where -ai and -bi =the roots of the numerator and denominator, respectively. Solution: MATLAB Code: see file: EGM3344_HW4_624.m Output: There for the system gain function is : ?( 𝑠) = (𝑠 + 4 ) (𝑠 + 3 ) (𝑠 + 2 ) (𝑠 + 6 ) (𝑠 + 5 ) (𝑠 + 3 ) (𝑠 + 1 )
Problem 8.3 Write the following set of equations in matrix form: 50 = 5𝑥 3 − 6𝑥 2 2𝑥 2 + 7𝑥 3 + 30 = 0 𝑥 1 − 7𝑥 3 = 50 − 3𝑥 2 + 5𝑥 1 Use MATLAB to solve for the unknowns. In addition, use it to compute the transpose and the inverse of the coefficient matrix. Solution: Matrix form: [ 0 −6 5 0 2 7 −4 3 −7 ] [ 𝑥 1 𝑥 2 𝑥 3 ] = [ 50 −30 50 ] MATLAB code: see file: EGM3344_HW4_83.m Output: x 1 = -17.0192 x 2 = -9.6154 x 3 = -1.5385
Problem 8.4 Three matrices are defined as ? = [ 6 −1 12 8 −5 4 ] , ? = [ 4 0 0.5 2 ] , ? = [ 2 −2 3 1 ] (a) Perform all possible multiplications that can be computed between pairs of these matrices. (b) Justify why the remaining pairs cannot be multiplied. (c) Use the results of (a) to illustrate why the order of multiplication is important. Solution: MATLAB Code: see file: EGM3344_HW4_84.m Output: (a) (b) B*A and C*A cannot be multiplied because their inner dimensions do not match. (c) The order of multiplication is important because they can result in different values. For instance, B*C results do not equal C*B.
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