Concept of centrifugal tension, Mechanical Engineering

Concept of centrifugal tension:

Explain concept of centrifugal tension in any belt drive. What is main consideration for taking maximum tension?

Sol: The belt continuously runs over both the pulleys. In tight side and slack side of belt tension is increased because of presence of centrifugal Tension in belt. At lower speeds centrifugal tension can be ignored but at the higher speed its effect is considered.

The tension caused in the running belt by the centrifugal force is known as centrifugal tension. Whenever particle of mass 'm' is rotated in circular path of radius 'r' at uniform velocity 'v', a centrifugal force is acting outward radially and its magnitude is equal to mv2/r

i.e.,        Fc = mv2/r

The centrifugal tension in belt can be computed by considering forces acting on an elemental length of the belt(that is length MN) subtending an angle dq at the center as shown in the given figure

Let

v = Velocity of belt in m/s

r = Radius of pulley over which belt run. M = Mass of elemental length of belt.

m = Mass of belt per meter length

T1 = Tight side tension

Tc = Centrifugal tension acting at points M and N tangentially

Fc = Centrifugal force acting radially outwards

The centrifugal force R which is acting radially outwards is balanced by components of Tc acting radially inwards. The elemental length of belt is

MN = r. δθ

Mass of belt MN = Mass per meter length X Length of MN M = m X r X δθ

Centrifugal force = Fc  = M X v2/r = m.r.δθ.v2/r

Now by resolving force horizontally, we get

Tc.sinδθ/2  + Tc.sinδθ/2 = Fc

Or       2Tc.sinδθ/2 = m.r.δθ.v2/r

At the angle δθ is very small, thus = sinδθ/2 = δθ/2

Then above equation becomes as

2Tc.δθ/2 = m.r.δθ.v2/r or  

Tc= m.v2

Posted Date: 10/19/2012 6:46:23 AM | Location : United States







Related Discussions:- Concept of centrifugal tension, Assignment Help, Ask Question on Concept of centrifugal tension, Get Answer, Expert's Help, Concept of centrifugal tension Discussions

Write discussion on Concept of centrifugal tension
Your posts are moderated
Related Questions
Wave motion takes place all throughout nature, from the waves of the ocean to the electromagnetic waves that comprise visible light. Though different types of waves involve differe

Figure aside shows a belt conveyors which consists of endless belt. It has a power driven pulley at one end which moves the belt or downward flow of materials. General

Time Dilation The measurement of time involves the concept of clocks attached at each position co-ordinate of a Lorentz frame. As a consequence of Lorentz transformations, it i

open die closed die

limitations of DNC

Create Visual Basic function ffactor(Re, rr) that calculates the Darcy-Weisbach friction factor in a pipe or duct, where Re is the Reynolds No. and rr is the relative roughness, us

Q. Why we need additives explain? Additives are the materials added in small quantities to the moulding sand in order to enhance its exiting properties and to impart to it spec

application of optiz

give some best names

A simple Rankine cycle works between pressures 0.06 bar and 28 bar, the initial condition of steam being dry saturated. Determine the cycle efficiency, specific steam consumption a