Understanding the Principle of Dampening in Hydrostatic Systems

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Discussion Overview

The discussion revolves around the principle of dampening in hydrostatic systems, particularly focusing on the role of spring-shaped pipes traversed by oil. Participants explore the physical principles, governing laws, and applications related to dampening in flowing fluids, as well as the context of hydrostatic technology in machining.

Discussion Character

  • Exploratory
  • Technical explanation
  • Conceptual clarification
  • Debate/contested

Main Points Raised

  • One participant notes that the helical pipe's length and lack of sharp corners contribute to energy dissipation due to the viscosity of the oil, which dampens movement.
  • Another participant questions the governing law for this behavior, suggesting the Navier-Stokes equations.
  • A different participant proposes the Darcy–Weisbach equation as relevant to the discussion.
  • Concerns are raised about the terminology, with one participant pointing out that "hydrostatics" typically refers to non-moving fluids, questioning if the discussion is more about dampening motion in flowing fluids.
  • Speculation arises regarding the application of the hydrostatic system, with one participant suggesting it may be related to static fluid support for heavy materials, indicating a potential focus on hydraulic damping.
  • Another participant inquires about the specific use of the table, asking for details about its application in optics, machining, or metrology.
  • A participant mentions that the table is used for machining and highlights vibration dampening as a key advantage of hydrostatic technology.
  • There is a question about the visibility of the coils in a provided image related to the hydrostatic system.

Areas of Agreement / Disagreement

Participants express various viewpoints regarding the principles and applications of dampening in hydrostatic systems. There is no clear consensus on the governing laws or the implications of hydrostatics in this context, indicating multiple competing views and unresolved questions.

Contextual Notes

Participants express uncertainty regarding the terminology and the specific physical principles at play, as well as the exact application of the hydrostatic system being discussed. There are also references to different equations that may govern the behavior of fluids in this context, but no agreement on which is most applicable.

Andrea Vironda
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Hi,
In some hydrostatic tables I can see many spring-shaped pipes that are traversed by oil.
Spring is responsible for a kind of dampening that I ignore how to deal with.
Do you have any idea of the physical principle behind it?
 
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Andrea Vironda said:
Do you have any idea of the physical principle behind it?
The "spring" = helical pipe, has a great length without sharp corners. The viscosity of the oil flowing in the long thin pipe wastes energy, and so damps movement.
 
Thanks Baluncore.
What's the law governing this behavior? Navier-Stokes?
 
I was confused by the title, since "Hydrostatics" implies that the fluid is not moving. Is this more about how to damp motion in a flowing fluid? I can change the thread title if that would help to make it more descriptive. :smile:

https://en.wikipedia.org/wiki/Hydrostatics
 
@berkeman
I am also guessing wildly here, which certainly makes it interesting.

I suspect it is a static fluid support for a large and heavy slab of material, such as a granite precision surface plate. I think it is hydraulic damping of the static position, so maybe only stress reduction?

@Andrea Vironda
What is the table used for. Is it optics, machining or metrology ?

We need a manufacturer and model number, or a link on the web, to a picture of a similar table, with coils of tubing between supporting bladders?
 
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This table is used for machining. I have this marketing image in with you can see a general layout (column is around 6m tall).
1601903634285.png

The main advantage in using hydrostatic technology is vibration dampening.
The hydrostatic rotary tables are the 2 scrolling on the blue bases
 
Are the mentioned coils visible in that image?
 

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