ME 3455
Spring 2015
Northeastern University
Department of Mechanical and Industrial Engineering
DYNAMICS & VIBRATIONS
(1/15/2015)
Instructor: Professor George Adams, 203 SN, T: 617-373-3826, email: adams@coe.neu.edu
Conference Hours: Tuesday 10:00-12:00 a

Spring 2015 Name: g)o/u 2504
Northeastern University
Department of Mechanical and Industrial Engineering
Dynamics and Vibration (ME 3455): Exam #2
1) (30 pts) A spherical ball (A) with a very small radius weighs 134 N and
is welded to a light vertical rod

Spring 2015 Name: S0 [0 ﬁW/ﬂ
, Northeastern University
Department of Mechanical and Industrial Engineering
Dynamics and Vibration (ME 3455): Exam #1
1) (40 pts) The slider A moves with a constant speed of
3 m/s downward. The wheel rolls without slipping.

Spring 2015 Name: Soluﬁm
Nartheastern University v
Department of Mechanical and Industrial Engineering
Dynamics and Vibration (ME 3455): Final Exam
1) (20 pts) End A of rod AB moves to the right with a constant
velocity of 6 ft/s. In the position shown, d

Homework Assignment #12, Spring 2015
ME 3455: Dynamics and Vibrations
Two Degrees-of-Freedom Forced Vibration
Due Tuesday, April 28th
Extra Credit
1) Consider the two degrees-of-freedom system shown
for which you determined the natural frequencies and
mod

HW#4, Spring 2015
ME3455: Dynamics and Vibrations
Kinetics of Translation and Rotation
Problem 1: The door has a weight of 200 lb and a
center of gravity at G. Determine the constant force
F that must be applied to the door to push it open 12
ft to the ri

Homework Assignment #6, Spring 2015
ME3455: Dynamics and Vibrations
Work & Energy
Problem 1: A T-bar consisting of two uniform bars, each of length
L = 5 ft, is released from rest in the position shown. Neglect bearing
friction and determine the angular v

HW#3, Spring 2015
ME3455: Dynamics and Vibrations
Velocities in Plane Motion
Problem 1:
In the device shown in the Figure, the disk angular velocity is 2 rad/s (constant). Find angular velocity
and angular acceleration of both bars at the instant shown in

Homework Assignment #8, Spring 2015
ME 3455: Dynamics and Vibrations
Free Vibration: With and Without Damping
Due Thursday, March 26th
Problem 1:
The cylinder shown in the Figure is displaced 100 mm
downward from its equilibrium position and released at t

HW#2, Spring 2015
ME 3455: Dynamics and Vibration
General Plane Motion Velocities
Due: Wednesday, January 28, 2015
Problem 1:
In the device shown in the Figure, the disk angular velocity is 2 rad/s. Find angular velocity of both bars
at the instant shown

Homework Assignment #11, Spring 2015
ME 3455: Dynamics and Vibrations
Two Degree-of-Freedom - Free Vibration
Due Wednesday, April 22nd
1) Determine the natural frequencies and modes of
vibration for the system shown.
Partial Answers: 0.755 k / m , 2.02 k

Homework Assignment #10, Spring 2015
ME 3455: Dynamics and Vibrations
Rotational Unbalance and Support Motion
Due Monday, April 13th
1) A lathe is modeled as an electric motor mounted on a steel table. The table plus the motor have a
mass of 50 kg. The ro

Homework Assignment #9, Spring 2015
ME 3455: Dynamics and Vibrations
Forced Vibration
Due Thursday, April 2nd
Problem 1:
Determine the amplitude X of the steady motion of the 10 kg
mass if a) c = 500 Ns/m and b) c = 0.
. = 13.4 , 22.7 .
Problem 2:
The hom

Homework Assignment #5, Spring 2015
ME3455: Dynamics and Vibrations
Kinetics of General Plane Motion
Problem 1: The lawn roller has a mass of 80 kg and a radius of gyration
of 0.175 m about G. It is pushed with a force of 200 N at the 450 angle
as shown.

Homework Assignment #7, Spring 2015
ME 3455: Dynamics and Vibrations
Undamped Free Vibration
Due Thursday, March 19, 2015
Problem 1:
A mass of 100 g rides on a frictionless guide rod. If
the natural frequency of the system consisting of M
with only spring

HW #1, Spring 2015
ME3445: Dynamics and Vibrations
Review problems
Problem 1:
Small steel balls fall from rest through the opening at A at the steady rate of two per second. Find the
vertical separation of the two consecutive balls when the lower one has