Recent content by magicfrog

Let’s say it would be worth designing, even though such a system can already be found in many other applications. I would have the opportunity to build equipment to simulate this phenomenon and study it experimentally.

I’ll try to attach a sketch. It’s the simplest one I could think of, but it does represent what I’d like to model in physical terms. It shows a hydraulic circuit set in motion by an external force (spring, motor or ‘human power’). By pulling the piston to the right, I move the fluid from the...

Could you help me write out the system of equations?

I should rewrite and simplify the continuity and momentum equations for the case at hand, probably reducing it to a two-dimensional problem. I do not have the relevant ready-to-use equations in front of me, so I would need to sit down and derive them myself :)

The goal is to design the damper. But in order to do that, I first need to clearly understand what it actually implies, and above all the physics behind it. My basic idea was to describe the relationships governing this phenomenon and to generalize them, not only for this specific case study...

I mean software that allows me to carry out fluid dynamics analyses as CFD analyses.

Isn’t the use of simulation software or other computational methods sufficient on its own to derive an initial value to be tested subsequently using the prototype?

So, if I’ve understood correctly, I should first build a fairly realistic prototype without the hydraulics, test it, and then, once I’ve added the hydraulic components, assess the system’s deceleration and, based on that, determine a damping value?

Yes, I would like to develop a mathematical model that can describe the behaviour of a hydraulic damper with an adjustable nozzle, and that I can verify both through testing (if only I could figure out how – I’m thinking of measuring deceleration, or how time varies with and without damping, or...

Hi everyone, I’ve tried searching the forum for similar topics but I don’t think I’ve found anything relevant to my specific situation. That’s why I’m here to start this new thread. I am currently studying a hydraulic brake. The spring-operated system is capable of varying its speed (e.g...

I probably didn't express myself clearly, and I apologise for that. Everything will be managed by an external action. For example, I pull the stem to accumulate and store energy, disengage the stem and continue my run. I push the stem to engage it again, recover the stored energy and express it.

I was thinking about a nested system of cylindrical cams. At least two driven by the same linear stroke of the rod. The outer one would rotate the collar and position it in a stop position relative to the spring thrust, and an inner one would decouple the rod in a second consecutive moment. In...

Yes, I thought about something like that too. But how would you rotate the key? With an external action? Or always with a mechanism linked to its single linear stroke? Basically, it should be something reversible, in the sense that what happens on the forward stroke must also happen on the...

The rod can only translate linearly by a given number of millimeters. However, nothing prevents adding a collar that can rotate while the rod translates, so you can engage and disengage the mechanism. Were you thinking of a barrel cam?

I think that kind of mechanism is a push/pull mechanism. To enable the free travel, I need to push in one direction to release it in the other. Unfortunately, in my case I only have a linear stroke, with no possibility to implement a push/pull mechanism.