# Thread: Damping Factor of Conveyor Belts

1. Dereck Guest

## damping factor the belts

I need to know values of the factor of damping "c", of the belts reinforced with steel cables that are used for the material transport in the mining ones. I have a denomination that is 21CV1.
If somebody has this value of "c"(damping factor) and he could give it serious very good for my.
thank you.

2. Explain what your damping factor represents. Is this a vibratory factor? Is it longitudinal, transaxial, impact?

What is the application?

Are you trying to do elastic transient dynamic tension or shock wave analysis?

Is the factor you seek time, velocity or accelereation dependent?

Lawrence Nordell
Conveyor Dynamics, Inc.

3. Dereck Guest
The factor or coefficient is a vibratory factor, one can obtain from the belt when carrying out a rehearsal of free vibrations.
This coefficient, commonly denominated "C" it intervenes in the answers dynamic transientes.
I need this coefficient to be able to evaluate their importance in the dynamic tensions that take place in the belts conveyors reinforced with steel cables during the detentions of a system transporter.
I need the value of this coefficient to include it in the matrix damping of a system of differential equations of second order.This is to evaluate the longitudinal answers of the system.

4. I asume you are refering to the C in:

F(t) = Mdx^2 + Cdx + Kx + Gx + H(dx,x); where C= velocity dep.
from our paper:Transient Belt Stresses During Starting & Stopping
Nordell, Ciozda in Bulk Solids Handling Vol. 4 No. 1 March 1984.

Unfortunately, C is not single valued. This C damping property varies with belt construction, idlers, idler spacing, belt load crossection, and belt tension all along the conveyor's carry and return strands. Furthermore, the damping is a property of core gum and cover rubbers used and steel cord and/or fabric construction. Also the steel cord varies with cable construction, rubber penetration in the cable matrix and factory cable pretensioning.

A lot of research has evolved on these points and certainly differs between specialist in this field. Conveyor Dynamics, Inc. developed the basic formulation structure in 1980-1983 and published this concept as noted above. We continue to enhance its details. Others have also made reference to the complexities in BSH in later issues. Refer to our latest publication for more field measurements demostrating the dynamic shock wave non-linearity in Bulk Solids Handling:
"The Power of Field Measurements - Part I"
Lodewijks, Kruse BSH Vol. 18, No. 3 July/September 1998

Good Luck,
Lawrence Nordell
Conveyor Dynamics, Inc.
web site: www.conveyor-dynamics.com
emails: nordell@conveyor-dynamics.com
phone: USA-360-671-2200

5. Dereck Guest

## Nordell

Thank you for their answers. But in their carried out works and their experiences the order of magnitude that level is approximately (I need to know that order is, you that it depends on several factors, but you imagines that he has some data of its works carried out in those that I can index this order of magnitude for the elements that compose this matrix of damping). for example... .10,100,1000 or but.
The factor "C" it is measured in Kg/s by what I have understood.