Belts
Highlights of the topic covered till 24.01.2009
1. Velocity ratio
2. Length of the belt : open belt drive, crossed belt drive
3. Ratio of tensions , flat belt, V belt , rope drive
4. Angle of lap should be in radians
5. value of Alpha varies for open and cross belt drive
6. Power transmitted = product of velocity and difference in tensions
7. centrifugal tension = mass X square of velocity of belt
8. Maximum tension = centrifugal tension + tight side tension
9. Conditions for maximum power
10. Initial tension
11. Derivation for length of belt for open and crossed belt drive
12. slip, creep , stresses in belts
Problems in finding the power transmitted
Steps:
1. Find out the tensions .T1.T2 ,Centrifugal tension ,Maximum tension
2. For finding these tensions you need to calculate the mass and velocity and the angle of lap
3. For finding the angle of lap you need to calculate the value of Alpha.
4. If mass is not given directly , find it out using the value of density and assume the length as 1m.
Refer the formulae chart and the assignment problems
Students are advised to submit the problems [ 1 to 10 ] before 30.01.2009 , [ 11
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