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Assume we have a conveyor scales. Which consists of scales, and motor with conveyor belt placed above, so that the boxes can be measured (weight) while moving above. What I want is to create the model of the oscillations of that scale. The equation of the oscillations of the spring is well known for everybody. How to include the influence of the motor, conveyor and other important effects to the system? Is there any papers (articles) about this thema? I think that the influence of the motor in simle case can be modelled as the force: $F(t) = A sin(\Omega t)$ Where $A$ is a constant and $\Omega$ is the parameter which depends on the motor (frequency), which is also constant (depending on the speed of the motor). How to add the ocsillations created by conveyor belt and may be some other oscillations such as box moving above can create additional vibrations?

EDIT 1: I want to crate the model. I have created one for a scales, but without conveyor and motor. It seems that they do not match. The data of the model and the real data of the conveyor with scales. So there sems to be a big influence of a motor, conveyor belt etc. And what I want is to identify what has a big influence and include it inside the system. So that my model will match the real system. I don't care of some influences which do not make big difference. It is difficult to identify what makes a big influence. And It is more difficult to model for example the moving of the conveyor with or without a box above. How to do it?

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It seems more engineering than physics to me. –  Henning Makholm Oct 31 '11 at 10:25
    
The question is a little unclear (so maximus, if you could clarify the setup and specify exactly what effects of the motor and conveyor belt you're looking to model, that would be great), but if I'm understanding it correctly I think this is fine here. It's basically about mathematical modeling of a physical situation, which is just what physics is all about. If it were asking how to build this device, for example, then it would be an engineering-type question and therefore off topic. –  David Z Oct 31 '11 at 19:13
    
@David Zaslavsky: Not engineering. I asked it on math exchanged, they suggested physics exchange... I updated the question. Please refer. –  maximus Nov 1 '11 at 2:03
    
yes, I was pointing out, in response to Henning's comment, why your question (as originally written) was not an engineering question. (Honestly, I liked the original version better - I don't think your edit really adds much of anything constructive to the question) –  David Z Nov 1 '11 at 2:18
    
@David Zaslavsky: Ok, but what kind of specific information has to be added here? I want understand how to include the other effects in general. Of course there is a speed of the motor, the length of the conveyor belt etc. But the simple model of just a spring is not sufficient here, because moving of the box makes some effects to oscillations. I can't understand how to model it, suppose that I have to add motor vibrations as a external force, and something more to make my model fit the real data. –  maximus Nov 1 '11 at 17:32
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