Hydraulics & Pneumatics: Controlling pressure is key to motion and force control, but there is little understanding of how pressure is controlled. A common misconception is that pressure is “resistance to flow,” or that pressure is controlled by servo valves using the pressure gain curves. It is time to take a closer look at exactly what happens when a hydraulic system operates.
1 comment:
Oh fluid mechanics, how I have not missed you. All jokes aside, I actually really like keeping up with hydraulics and these posts because they offer useful insights and refreshers on key systems that we interact with all the time in the theatrical world. This article really doesn't get too technical, but does provide a good quantitative analysis of pressure changes in static and dynamic systems. Some of the equations are a bit unclear and not described nearly to the level that I would hope, but in the end you get an equation that, as the author notes, can be thrown into an excel spreadsheet. There are ultimately many factors that aren't considered in these models, but it really doesn't matter when it comes to control systems and sampling rates, since the numerical methods used are pretty straight forward and adapt. I'm curious to see how the author continues discussing this topic in their next article, which actually covers this exponential behavior of these systems.
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