Simple Hydraulic System Working and simulation
Вставка
- Опубліковано 27 лип 2014
- This video will explain about a simple hydraulic system working with animated simulation.
You can clearly understand various stuffs related to control valves, rate of build up of pressure, many other visualizations.
Music:
License machinimasound.com/license/
Intro: GBOYSTUBE
Remaindered easily with this simple and effective explanation. Thanks
One of the best channels. Coming from an electrical POV, this is very helpful. More videoes please!
The best explanation i jave gotten that not even my teacher came even rometly close to making me understand. Thank you very mich Sir!
So close, it's an amazing visual and made me understand hydraulics clearly like none of the other vids I watched, but I gotta say the first thing I learned when I looked into it all this is that liquids don't compress. So... not sure how you got so far as you did. Totally informative otherwise 👍
Since liquid are incompressible... The piston should remain as it is when raised... And not come down by it self when all ports are closed.
In piston and cylinder block, I think the piston must be settled on a level above the lower orifice port not in line with it, so as allow fluid to enter the cylinder below the piston and push it up in the case of lifting.
I appreciate the explanation. It really helped.
Very nice presentation. It would nice to bring out the next version of this video where the rate of hydraulic fluid flow could be controlled to move the load at a specified acceleration.
Very well made, thank you!
Do hydraulic pump systems currently have a variable power output mechanism, like a 'transmission' at the pump body, so that a faster response could be used in a light weight load, while full power (slower extension) could be applied to heavy loads? The one shortcoming of hydraulics currently for robotics is that they seem to be "all-or-none" regarding piston extension/retraction, and also that they are without an acceleration / deceleration phase in their movement.
For the "all-or-none" solution, I'd propose the pump body being matched to a variable CVT type of transmission, allowing either very quick fill with light loads (fast movements) while also allowing full power though slower movement for heavy loads.
For the acceleration / deceleration solution, I'd propose a valve that turns to allow a small flow, increasing as the valve opens, then decreasing again as the valve turns into closure.
Simple method of explanation.. Very useful
Krishnakumar Cheruparambath Thanks. do watch the other videos in the series
very well made it is a excellent programme on hydralic system basic function
The explanation in itself is rather good, but I did notice one thing which other users have as well: Liquids cannot be compressed, and so, even under load the cylinder should stay in the same position.
This can also be seen in cranes mounted on lorries, where the main arm (that is, the first one after the hinge with the base) will stay at the same position when the crane is lifting a load, even when this is several meters away from the cylinder.
The reason is rather simple: To extend or retract a cylinder, an amount of liquid is pumped into one end of the cylinder. When the valves are closed, the liquid is effectively "captured" in the cylinder, and so, the cylinder will stay in the position it reached when liquid was moving it.
This is the example of load holding system so there should be a pressure sequence valve and flow control valve too at the rod side of the cylinder to control the speed of the cylinder during the lowering of the cylinder.
hi bro, could you tell me what the software to make above simulation !?
hehe am learning this system in 45 mins , before my job interview , thanks very usefull video helped me alont ! :D
Did you get the job? :P
that is not perfect broo that system will fail the prematurely and overheat the system
Good video other than what others have already stated where can I learn more about "pressure sequence & control valve"???? Thanks for the video
One of the best video basic hydraulic explanation bro
Very shocked how informative this video was. Thank you
The big flaw in this presentation is that you should never use a closed center contol valve with a fixed displacement pump. In neutral position, when no work is done, the pump create full flow at full pressure over the relief valve all the time. This creates heating of the oil and the system, consumes a lot of unnecessary energy and wears out the pump.
With an open center control valve the oil has free passage from the pump through the valve to the tank. This is how this system is realized in practice.
Great demonstration
Informative simulation... Nice sir
thank you for the useful information, can i ask what is the software used in designing thi system
Very well explained. Thank you.
hi, great video, probs the closest i've gotten so far in my project apart from it's too much for my project XD
my project is an elevated king size bed. the frame would be made from scratch mainly wood and metal brackets and extra shelves for extra support.
my main goal is that i want the mattress elevated from a button when not in use as i'm planning to have my computer etc underneath. so essentially it's like a low down bunk bed but king size.
my question is what hydraulic arms called and is there a way to have them push and retract from a push of a button and where can i get them?
many thanks in advance :)
thank you..very helpful
I've modified the simulation a little and made another video to explain thing better ua-cam.com/video/8JVuJQb5H08/v-deo.html . On the compressibility of oil point, we do normally say oil is incompressible, most calculations are based on this. However, when designing systems we need to keep pipe lengths short to ensure the system is stiff enough to be virtually incompressible. In reality, oil is slightly compressible and this does greatly affect the design of high-performance systems. In the simulation, we had exaggerated the compressibility to show its effects, but it was not really intended to explain much in this model. For example the spool centre condition is wrong and there is no load control either.
which software i can use to do like this simulation ?
Really useful information. Thanks.
VERY GOOD ! AND VERY CLEAR
the oil is liquid, and liquid suppose to be a (non compressible ) so that means that oil escape through the valves to the tank, or somewhere else
+medo sam . I agree oil is non compressible.
The oil go back to the reservoir tank using the return line
Well spotted. Not compressible as accurate positioning may be required by the system.. up to 10% of leaks are expected as the viscosity of the oil changes with temperature. Hydraulics is one of my areas as a mechanical engineering student
Sir awesome explanation. Please add your videos on tamil also...by that subject will havr been very clarity than this.
Nicely Explained
Good articulated👍
but you forgot to show relief valve in place while returning from piston.
Fluid is incompressible
name of program I simulate on it !
what if the Piston cylinder is drifting in roll clamp
So basically what creates the pressure are the fans ?
could you post the link of the program , thanks in advance
very useful very good explanation
that's a nice good video, what is the software that you use to create this animation?
Sir.. The video was awesome... Best xplanatory untill that liq compressing statement came..
Though good work... Appreciate💕
Excellent!
Good presentation, except for the claim that the load will lower because the fluid below is compressed. Elementary fluid mechanic laws broken right there. What will occur is hydraulic lock until direction of flow is switched.
what application did you use to make that animation ?
Awesome explanation bro,,,
I want to fix a point that you said in 8.13. It can easily come down, that is correct but not by gravity. dropping time of a body is independent of mass. For example, there are two bodies which have different mass. but they have same level high. so, when we drop these in the same time, than we will see that two bodies to fall on the ground at same time ..
Hi, there are two things I do not understand.
1. The piston falling with closed valves: shouldn't the oil be practically uncompressible? How is it possible that it compresses and expands so much? I though the slow falling was due to leaks for the excessive pressure on valves
2. The arrows at 4m2s: are they actual pipes, or do they just point a direction? If they are not specific pipes, I see no reason why oil should press under the piston: the pressure is lower in the pipe going back to the tank, bottom left, so I expect the oil to flow out freely from there, instead of increasing the pressure inside the tank.
Anyone could give me a hint?
thank u.. u help me a lote :)
thanks for info
Thanks!
Thank you.
Very nice content...! Clear explanation..! More videos to come..
But you should never use a closed center contol valve with a fixed displacement pump. In neutral position, when no work is done, the pump creates full flow at full pressure over the relief valve all the time. This creates heating of the oil and the system, consumes a lot of unnecessary energy and wears out the pump.
With an open center control valve, in neutral position, the oil has free passage from the pump through the valve to the tank. This is how this system is realized in practice.
machine... thanks for sharing this knowledge..
your spool valve is wrong this is a gear pump and needs to have p linked to t in the neutral position or the relief valve will be blowing off all the time
Gear pump is running opposite according to the diagram in the video
thank u very much
Thanks got to understand the solenoid... ✌
other than that.. it shouldn't be compressing...unless there are leaks...
simple and nice .....,
Very nice job
thank you
Resistance to flow is pressure as we learned in mechatronics
sir,i want to pursue my career in hydrauclics i.e drives and control by hydraulics and fluids.Can u guide me regarding the same ie the future,etc
Nicely presented but a fluid is uncompressable, so when the piston starts lowering it is due to leakage
Can u give 5 components on the circuit hydraulic
thank you soo much sir
my dear how the liquid will compressd? and if you are right then we can fill 20 liter water in a 10 liter can .
+sajjad hussain Are you a professor in hydraulics or have business in this area? can we talk sir.
+sajjad hussain Cannot agree more with you. Coming down the load is mostly due to the cylinder internal leakage not fluid compression.
Yaser Maddahi i m agree with u... thankyu
Mr.Yaser sajjad hussain is trying to say there is no more compressed after control valve stop. Cylinder start to come down due to internal leakage. Oil is already compressed during push the cylinder pushed up.
Yaa.. fluids are non compresible
You can compress liquid.
ITS EXCELENT
Oil is non compressible but can go through the valves that's how a plane works for its gears as well
"Circute"???
As far as i know, hydraulic oil is incompressible. This is the main principle behind hydraulic systems. But in this video of yours, at 6:00 the piston is at top position. How come it compresses down the hydraulic oil? And don't tell me that the oil above the piston is being expanded.
no hydraulic fluid is non compressible but there are leaks in almost any system this is also a simulation that cant capture all of those small leaks, seals and piston rings are not perfect
7:15 the piston is rising but still it shows the fluid is passing through to the relief valve
The relief valve doesn't open fully immediately. At the limit pressure only a part of the oils flows through the valve. As an example: If the relief valve is set to 3000psi it starts to open at maybe 2900 psi and opens fully at maybe 3100psi.
why your cylinder piston comes down if neutral position... that is no good
Your system will overheat the hydraulic oil because the pressure at neutral is too high you make it an open center control valve
Good wrk ..
It should have been more smart to show the rod up side down, then you can show that the whole area of the cylinder can be used. Now in this example a part of the cylinder is 'occupied' by the rod.hence less surface (you have to subtract the surface of the rod), hence less power
Dear Sir..........I have single acting a cylinder with a bore of 18 mm and a rod of 10 mm and a stroke of 300 mm. I want to know what is the pressure if my cylinder presses 1 mm ........... Please advise and provide a solution with the formula
Engineering Adventures
9 months ago
Sriram has NO copyright to use this simulation. It is an old version with the R/V set to low so giving a false output. the assumption is wrong and I've asked him to remove it. I've now modified the simulation and made another video to explain things better ua-cam.com/video/8JVuJQb5H08/v-deo.html . On the compressibility of oil point, we do normally say oil is incompressible, most calculations are based on this. However, when designing systems we need to keep pipe lengths short to ensure the system is stiff enough to be virtually incompressible. In reality, oil is slightly compressible and this does greatly affect the design of high-performance systems.
verry nice
Thankyou sir for such clear video and the concept.. but may i know how we can we un lift the heavy equipment gradually. The rapid falling of ram could damage the good. The ram may fall vigorously if it is allowed to fall under the force of gravity
+Pravat Devkota There are valves that can be partially opened. :-)
may i know what type valve do we use here?
and thanks for your reply.. hope to hear your ans :)
+Pravat Devkota Different systems will have different valve mechanisms. To give you example, a simple butterfly valve if made of suitable size and provided controls can be effectively used. There are p-valves, (p for proportioning) too, that can be used. Exact valve will depend on the machine and you may check from their websites.
Software kon sa hai
Nice
Thanks
thanks...
bur I'm sure that gear pump is turning in the wrong direction...?
+Andre Vorster it's not turning in the wrong direction.
+Andre Vorster it`s correct direction!
No the relief valve is not the way oil is returned to tank while spool valve is in centre position, if this was the case you would be replacing pumps all the time as well as every o ring in the system constantly, oil has to return to tank under zero pressure when valve is in centre position
Right on brother. You should be teaching the class!!!!
Relief valve to tank equals heat. Prints don’t like heat. Plus you’d grenade your gear pump instantly
Orings don’t like heat sorry
Its a horrid idea! The fixed displacement pump isn't the pump for this at all! That or you should put a tandem center so Pressure goes back to tank with no restriction. however you would still have alot of wasted energy. Variable pumps are so much more efficient. Using the relief valve will heat it up from energy transfer and youll destroy the relief so quickly it isnt funny! I sell relief valves at work and you'd be buying them and pumps left and right trying to replace them because the DCV is using the wrong center. If that relief valve ever failed to open youd blow the seals on the Closed Center and your pump would die. Oil has to go from tank back to tank and if you block that flow its going to build and build like a shook soda can until at some point it finds a way out on its own!
that is correct broo i have pitty with the student of this instructor learning in a wrong way
Its good
5:47 What is the theory behind the piston dropping? We assume the seals are all intact and the valve working correctly. You can't compress a liquid (I don't think?) so where is the excess liquid going? Not criticising you video, just learning.
All seals in a hydraulic system leak a little even if they're intact. Of course not as fast as this. It can take days, weeks and even months before a piston "falls down". But it doesn't happen in a few minutes.
good
This was a good video until you mentioned that oil compresses, which kinder got me questioning your level of expertise in hydraulics
😄😄😄True...
tp avec commandes
This video is not correct. It uses, without permission or copyright notice, a simulation from e4training.com where the r/v was set too low and is leaking. We have a correct version on our site and have asked for this to be taken down.
Looks like you have a bad seal or a leak buddy.
Sounds like alister overeem!
This is misleading! In combination with a fixed displacement pump like this you should always use an open center contol valve. It means that when the valve is in the middle non-working position the oil flow is free between the pump and the tank. That means the oil can flow free and almost no pressure is created, the pump can run idle. The release valve is only needed when the piston reaches the ends of the cylinder or to limit the power of the piston. This is how most common simple hydraulic systems work in practice. A closed center control valve, like the one in this video, should only be used in combination with pressure compensated variable displacement pumps.
all explanations are good but fluids are incompressible substance how you using that word ....
KRISHNA KUMAR Singh liquids not fluids. air is also a fluid and air is compressible
KRISHNA KUMAR
A fluid is any substance that FLOWS. It could be a gas or liquid. All gases and liquids are fluids.
Before you think of making another video, you should think about a better microphone so we can hear you.
CANOT HEAR ANYTHING
it's simple
Oil is getting compressed? Seriously
You can not compress a liquid. !
Everything can be compressed. All you need is extremely high pressure and no loss of mass. This is all theoretical. But at a certain point the molecules will desintegrate and your material will change. At this point we talk about nucleair science.
Can not compress liquids, That is a fact!
You can compress fluids. It takes alot of pressure, but you can.
Hydraulic oil has properties that make it not compress, but it does, just very little.
You need to go back to school. Fluids CANNOT COMPRESS
Speak up, Johnny!