Size of links and loads in the hydraulic system

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    Hydraulic Links System
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Discussion Overview

The discussion revolves around the design considerations of a hydraulic system, specifically focusing on the impact of the cross-sectional area of links (tubes) on fluid transfer and the forces exerted on the system. Participants explore theoretical and practical implications related to fluid dynamics and mechanical stresses within the system.

Discussion Character

  • Exploratory
  • Technical explanation
  • Mathematical reasoning

Main Points Raised

  • One participant questions whether the cross-sectional area of the link affects the force exerted on the walls and expresses uncertainty about the implications of decreasing the area.
  • Another participant clarifies that the link is a tube transferring fluid between cylinders and suggests that the cross-sectional area could influence the rate of fluid transfer and thus the movement speed of the pistons.
  • Further details about the assembly, such as whether the cylinders are fixed, are deemed important for understanding the forces and stresses involved.
  • A participant proposes that simple calculations could provide necessary insights, indicating that full computational fluid dynamics (CFD) analysis may be excessive for the problem at hand.

Areas of Agreement / Disagreement

Participants express varying levels of certainty regarding the effects of cross-sectional area on fluid dynamics and mechanical stresses. There is no consensus on the implications of these factors, and the discussion remains open-ended with multiple viewpoints presented.

Contextual Notes

Participants note the importance of specific design constraints and details about the assembly, which may influence the calculations and conclusions drawn. The discussion lacks definitive answers and relies on assumptions about the system's configuration.

roman9912
I am currently in the process of creating my own design in which every millimeter counts. I have the following question: does the cross-section area of the highlighted link make a difference, and does decreasing the area makes force exerted on the walls greater?

My guess is that cross-section area makes no difference and I know nothing of the second one.

College physics textbook seem to have no answer for either question. Any help from someone who know it?
 

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That 'link' is actually a tube which passes the working fluid from one cylinder to the other ?

Cross sectional area could affect the rate at which fluid is transferred and so control the rate at which the pistons can move . A quite simple calculation is possible but you will have to tell us more about the speeds that you want your pistons to be able to move at .

The forces acting on the tube and any resulting stresses depend on how the actual mechanical parts are arranged . Again quite simple calculations are possible but you will have to tell us more about the details of the assembly . Most significant thing we need to know is whether the cylinders are fixed in place or not .
 
Nidum said:
View attachment 211404

That 'link' is actually a tube which passes the working fluid from one cylinder to the other ?

Cross sectional area could affect the rate at which fluid is transferred and so control the rate at which the pistons can move . A quite simple calculation is possible but you will have to tell us more about the speeds that you want your pistons to be able to move at .

The forces acting on the tube and any resulting stresses depend on how the actual mechanical parts are arranged . Again quite simple calculations are possible but you will have to tell us more about the details of the assembly . Most significant thing we need to know is whether the cylinders are fixed in place or not .
Yes the link is precisely that. What I am trying to do is to transfer motion from one axis to the spring on the other (due to size constraints). I can give it a try and do 3D model + fluid simulation, but I would want to know for sure of the design constraints. All the links and fluid paths will be inside a molded part.

Thanks for your input
 
A small number of back of envelope calculations will tell you all you need to know . Doing full CFD analysis is a bit excessive for this problem !
 

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