MACHINE DESIGN  An
3201
PROBLEM 320
Statement:
Assume that the load of paper rolls in Problem 318 will slide sideways at a truck speed of 20
mph on the curve in question.
Estimate the impact force of the cargo against the trailer wall.
The
forcedeflection characteristic of the trailer wall has been measured as approximately 400 lb/in.
Given:
Weight of paper
W
p
44415
lbf
.
Weight of trailer
W
t
14000
lbf
.
Speed of tractor/trailer
v
t
20
mph
.
Radius of curve
r
50
ft
.
Trailer width
w
8
ft
.
Paper roll length
L
38
in
.
L
3.167
ft
=
Trailer wall stiffness
k
400
lbf
in
Assumptions:
1. The paper rolls act as a monolith since they are tightly strapped together with steel bands.
2. The worst case will result if friction between the floor and the paper is neglected.
Solution:
See Figure P38 and Mathcad file P0320.
1.
Calculate the distance that the rolls will slide before impacting the wall.
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This note was uploaded on 04/26/2010 for the course MAE 3242 taught by Professor N/a during the Spring '10 term at University of TexasTyler.
 Spring '10
 N/A
 Machine Design

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