This document discusses forced vibrations, which occur when a system oscillates due to an external periodic driving force rather than its own internal restoring force. It provides the equation of motion for forced vibrations, which is a non-homogeneous differential equation. The document also notes that the general solution can be found by solving the particular solution and matching it to the homogeneous solution. It states that if the frequency of the driving force matches the natural frequency of the system, resonance will occur, causing the amplitude of oscillations to become very large or even infinite without damping. Two example problems on forced vibrations of a car suspension and pendulums driven by an oscillating beam are also included.
Composition force is the method in which we are finding out the resultant force of a number of forces acting simultaneously on the body. ... Resolution of Forces is the method in which the process of breaking a force into the two components, basically horizontal and vertical components.
Resolution of a force. (Mech.) the separation of a single force or motion into two or more which have different directions, and, taken together, are equivalent for the single one; - the opposite of composition of a force. See also: Resolution.
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Learn Online Courses of Subject Engineering Mechanics of First Year Engineering. Clear the Concepts of Engineering Mechanics Through Video Lectures and PDF Notes. Visit us: https://ekeeda.com/streamdetails/subject/Engineering-Mechanics
A system of forces is said to exist when there is more than one force acting on an object or at a point simultaneously. It is important to acquaint ourselves with the various systems of forces. Copy the link given below and paste it in new browser window to get more information on System of Force:-
http://www.transtutors.com/homework-help/civil-engineering/fundamental-concepts/system-of-force.aspx
Vibration? Do you know what is vibration and how it is important and unimportant for us. What are the different types of vibration,where vibration effects are desirable and where not. What are the useful effects of the vibration and how it can make useful. How vibration can be eliminated or reduced to some extent. Different terminology or fundamentals of vibration is discussed briefly. So find the easy and simple description about vibration.
this slide deals with the basic concepts related to mechanical vibrations for more information you can go through any mechanical vibration book available for engineering students
Composition force is the method in which we are finding out the resultant force of a number of forces acting simultaneously on the body. ... Resolution of Forces is the method in which the process of breaking a force into the two components, basically horizontal and vertical components.
Resolution of a force. (Mech.) the separation of a single force or motion into two or more which have different directions, and, taken together, are equivalent for the single one; - the opposite of composition of a force. See also: Resolution.
http://bit.ly/2PIOIQM
Learn Online Courses of Subject Engineering Mechanics of First Year Engineering. Clear the Concepts of Engineering Mechanics Through Video Lectures and PDF Notes. Visit us: https://ekeeda.com/streamdetails/subject/Engineering-Mechanics
A system of forces is said to exist when there is more than one force acting on an object or at a point simultaneously. It is important to acquaint ourselves with the various systems of forces. Copy the link given below and paste it in new browser window to get more information on System of Force:-
http://www.transtutors.com/homework-help/civil-engineering/fundamental-concepts/system-of-force.aspx
Vibration? Do you know what is vibration and how it is important and unimportant for us. What are the different types of vibration,where vibration effects are desirable and where not. What are the useful effects of the vibration and how it can make useful. How vibration can be eliminated or reduced to some extent. Different terminology or fundamentals of vibration is discussed briefly. So find the easy and simple description about vibration.
this slide deals with the basic concepts related to mechanical vibrations for more information you can go through any mechanical vibration book available for engineering students
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5. FORCED VIBRATIONS
Free vibrations are those in which when a system is displaced
slightly from its mean position and then it vibrates with its own
force.
It is an ideal case. As mass spring system , simple pendulum
Forced vibrations are those vibrations in which a system
oscillates with the action of some external driving force or forces
that continue to act on after t = 0 . Force should be periodic in
nature.
6. EQUATION OF MOTION FOR FORCED VIBRATIONS
Forced vibrations are frequently seen in many mechanical systems .
In some cases these are called mechanical vibrations because there is mechanical
force behind it. Which is periodic
as example.
Running engine of car
Washing Machine
So equation of forced vibrations looks like
A
Where K → constant P → amplitude and w is frequency of force.
This is also known as general periodic function.
The above equation is a non-homogenous function.
7. SOLUTION:
The general solution for this equation can be found by solving
a particular solution.
This general solution corresponds to a particular solution of a
homogenous equation
We will guess a solution of this homogenous equation as:
→it’s a homogenous
deferential equation
1
8. by putting the respective derivatives of 1 in eq. A
If then blow up (destroy). Here is
magnification factor
9. GRAPHICAL EXPLANATION
If the system is in resonance then amplitude becomes infinite.
In real case amplitude does not goes infinite because there are
some damping forces.
10. PROBLEM NO. 1
1. A 1000 KG car carrying four 82 KG of each person travels over washboader
dirt road with corrugation 4.o m apart. The car bounces with maximum
amplitude when its speed is 16 km/h. when car stops and peoples get out
of car, how much does the car rise on its suspensions.
11.
12. PROBLEM# 2
.
Hanging from a horizontal beam are 5 pendulums of following
lengths a)0.10 m b) 0.30 c)0.40 d)0.80 e)1.2m suppose beam
goes under horizontal oscillations with angular frequencies in
range of 2.0 rad/s to 4.0 rad/s. which pendulum have large
amplitude?