1. Consider the simplified model we discussed in class about a car on a bumpy road. The car has a mass m supported by stiffness k and damping c. The road gives a displacement excitation R(t) to the car. The transfer function from R(t) to the car displacement y(t) is Hy(s) - Y(s) R(s) cs + k ms² + cs+k (1) (a) Determine the driving point impedance ZR(s), which is the ratio of the velocity R(t) to the force acting on the wheel from the road. (b) Engineer X is testing the car in the Vehicle Dynamics Lab of a start-up company GF.com. Because of insufficient cash flow, Engineer X only has the equipment to mea- sure ZR(s), and identify the zeros and poles of ZR(s). But eigineer X wants to find the poles of Hy(s). To do so, should Engineer X use the zeros or poles of ZR(s) instead? Explain why? m y(t) R(t) Figure 1: A simple model of a car on a bumpy road
1. Consider the simplified model we discussed in class about a car on a bumpy road. The car has a mass m supported by stiffness k and damping c. The road gives a displacement excitation R(t) to the car. The transfer function from R(t) to the car displacement y(t) is Hy(s) - Y(s) R(s) cs + k ms² + cs+k (1) (a) Determine the driving point impedance ZR(s), which is the ratio of the velocity R(t) to the force acting on the wheel from the road. (b) Engineer X is testing the car in the Vehicle Dynamics Lab of a start-up company GF.com. Because of insufficient cash flow, Engineer X only has the equipment to mea- sure ZR(s), and identify the zeros and poles of ZR(s). But eigineer X wants to find the poles of Hy(s). To do so, should Engineer X use the zeros or poles of ZR(s) instead? Explain why? m y(t) R(t) Figure 1: A simple model of a car on a bumpy road
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
Problem 1.1MA
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Question

Transcribed Image Text:1. Consider the simplified model we discussed in class about a car on a bumpy road. The car has
a mass m supported by stiffness k and damping c. The road gives a displacement excitation
R(t) to the car. The transfer function from R(t) to the car displacement y(t) is
Hy(s)
-
Y(s)
R(s)
cs + k
ms² + cs+k
(1)
(a) Determine the driving point impedance ZR(s), which is the ratio of the velocity R(t) to
the force acting on the wheel from the road.
(b) Engineer X is testing the car in the Vehicle Dynamics Lab of a start-up company
GF.com. Because of insufficient cash flow, Engineer X only has the equipment to mea-
sure ZR(s), and identify the zeros and poles of ZR(s). But eigineer X wants to find the
poles of Hy(s). To do so, should Engineer X use the zeros or poles of ZR(s) instead?
Explain why?
m
y(t)
R(t)
Figure 1: A simple model of a car on
a bumpy road
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