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22.322 Mechanical Design II
Spring 2013
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Exam #1 Re-do Problem Solutions
Problem 3
N2=35N3=(2.5)(10) = 25N4=55N5=(7)(5)=35N6=(9)(5)=45
+2
+2
+2
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Exam #1 Re-do Problem Solutions
Problem 4
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Rotating parts should be designed to be inherently balanced by their geometry.An unbalance in machines is attributed to irregularities such as machining errors, size variation in bolts, nuts, welds, etc., wear and particle accumulation.To balance a shaft, disk, or gear, we need to determine the size and location of the eccentric mass.Then, to correct the problem we can make the mass distribution symmetrical by adding or removing weightUnbalance in rotating machines occurs when a rotating member does not possess symmetry with respect to massExamples: automobile tire, washing machine
Lecture 18
Balancing
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Lecture 18
w2R
mw2R
V2
R
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Lecture 18
F
kx cx
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Lecture 18
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For a car, tire and rim balancing is necessary from time to time.A static wheel balance entails placing the wheel in a horizontal plane suspended by a cone through its center hole.A bubble level is attached to the wheel and weights are added to the rim until the wheel sits level.This type of balancing is generally no longer done because it neglects the effect of unbalanced moments.
Lecture 18
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Lecture 18
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Lecture 18
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Lecture 18
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To perform a dynamic balance of an automobile wheel, the following setup is typically used:
Lecture 18
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Learning with Purpose March 20, 2013
Lecture 18
Example