I Built an Adjustable Dyno to Properly Test Piston Engines Under Load!
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- Опубликовано: 9 окт 2024
- In this episode we are back in Gearblocks building a variable load dyno that will allow us to test piston engines under different conditions!
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"I'm pretty sure the whole setup would work better with heavier weights and bigger gearing"
- Not me, 3 hours ago
Anyways, try this setup:
Engine -> Centrifugal Clutch -> solid block
Then to operate it:
1. Set clutch disengage RPM at engine idle RPM.
2. Set clutch engage RPM at engine throttle cutoff RPM.
3. Set clutch torque to some torque value.
4. Throttle the engine until RPM stabilizes.
5. Note down the clutch RPM and torque while in the stable state (in an Excel sheet).
6. Repeat 3-5 for different values of clutch torque.
(Make sure you note down the current RPM and torque when stable, not the maximum torque setting!)
Your previous testing using large weights to load the engine is also a type of dyno called an inertia dyno. Basically you're able to calculate the rotational inertia of the weight and then you just need to measure the RPM as the engine spins up the weight. Its RPM will rise at some curve defined by the instantaneous torque on the weight at some moment in time.
What you have created in this video is basically a load with an adjustable rotational inertia. Cool video as always.
It doesn't really matter how you do the load. All that matters is being able to log both the torque and the RPM at the same point in time. There are a zillion different ways you could do that... even spinning up a heavy weight, as long as it happens slowly enough for you to log the numbers. I can't remember which creator it is, but they actually use a heavy disc to dyno quadcopter motors. But using microcontrollers, they can log torque and RPM very quickly. In your case, just use a heavy enough weight to allow logging at a much slower speed.
It would be cool if you live-streamed the building process of some of your projects, like the tank track project
Your design is genius but I think using a very high input smoothing on a brake would both work great and give you as wide a graph as you theoretically want in conjunction with the graphing script, with numbered values you can then match and graph to give you a super detailed analysis. Anyways happy building o/
11:18 couldn't stop laghing
Wouldn't the easiest way be to just have multiple brakes on an axle each set to a different torque value? That way, depending on the combination of brakes applied, you can vary the load on the engine. Like 100n, 200nm, 400nm, 800nm, 1600nm brakes, and you can apply a load all the way up to 3100nm. You will need to have 5 separate brake buttons to set/unset brake.
This is what I was thinking. I’ve never played this game but watched a bit of it. Seems like you can control torque as an input a a lot easier than you can receive it as an output. So I’d just pick my torque values I wanted to measure, and record the rpm’s instead. A little backwards but might be much simpler.
The main issue with torque measurement is that in combustion engines you want dynamic torque and not static .Static torque is really easy to measure ( a scale at the end of a lever )
Dynamic torque on the other hand is hard. A lot of these methods use the torsion of the axle (and all the ways of measuring torque this way ) to measure it ,while measuring the rpm of the shaft. Another really easy way is applying a brake to the engine shaft with some torque (you can calculate how much torque you're putting on the brake ,thus on the shaft ).When the rpm stabilises you know you're in equilibrium and the engine is outputting the same torque as the brake .
You can sort of replicate this with a clutch aswell ,i think some dude here on the comments explained it pretty well
We got the motor,
we got the tank tracks,
IT IS TIME!!!
the gun: am i a joke to you?
Super excited for this video my senior design project is to design and build a water brake Dyno super complex hard to do analysis and sims are a pain in the butt also the reason it's our project is they don't make water brake Dynos for outboard motors
Still early in the video but in theory you could have a brake engage with a numerically input number like 100 (usually max 1) making it take a long time to fully engage when either activated or deactivated. otherwise using analog control is an option.
p.s. not a dyno expert but going off of your basic teachings heh
Can't wait to see what optimal engine setup you guys find.
I feel like you had the right idea with the electric engine but the torque was set higher than the engine could produce, try it again with it set to 100nm and it should load the engine without killing it. Just adjust from there
you need to measure how fast you can spin a weight up with a known inertia.
I think… i think this is the earliest ive EVER watched a video after uploading on youtube
The water load is you take a water valve and start closing it of for more back pressure to control your load
Can you make a propellor with variable pitch? Would the engine respond appropriately if you made it try to move more air?
On a water brake dyno adjusting the load is as simple as restricting the water flow. It takes more power to push the same amount of water through smaller hole.
I mean, isn't that obvious? I've never even heard about such contraption before you explained it and I don't have practical experience or education about fluid systems either, but I still got it immediately.
shutup
Wouldn't a better way to do this be to just have a wheel with a brake hooked up to a transmission? Since changes in gear ratios inherently apply different loads to the engine and the brake on the wheel could be set to a constant strength guaranteeing the momentum won't reduce the load. Then you could just just change between the different gear ratios in the transmission to get a consistent and constant change in load.
You can always have different cluches that connect to a beam that has a weight on it and each weight is different
First time driving a manual… I shattered a piston rod (engine needed to be rebuilt anyways) when I accidentally dropped the clutch while I was not rev matched enough (I was trying to go to 1st from second… I was very uncoordinated, still am at times)
btw the second dyno that you demonstrated is not a dyno its a governer like the one a stationary steam engine
why not using centrifugal clutch 3x? i mean, you don't need to use that hole connector to attach clutch to axle (just make it more compact)
please build a dyno for the chasis that you put your first enige on
WOW HE IS BUILDING A DYNO-SAUR lol...
i hate you
Railroads Online? Derail valley with hyce? When again? I'm getting nervous!
I'm sure it will happen :p
Couldn't you just plug it into a brake and set the brake torque? Or even 8 brakes in a row, where each brake has twice the torque of the previous, so you have 256 loads controlled by a binary number?
If you used an electric motor not to turn against it but to turn with it and set max rpm to what ever reading you want, say 2000rpm and turn the electric motors torque way up would the engine then turn the motor past that or would the electric motor with really hight torque basically force it to not go past that by it's torque creating drag holding it at the set rpm? If so you could set multiple motors at different rpms all linked to an input shaft with clutches so you can press a key to select the rpm you want then log the bhp and torque at that rpm
stalling doesnt damage engines if it did they would break apart just from running as the pistons can only exert so much force onto the crankshaft and at full throttle they are at their max power output and its fine for the engine so stalling cant hurt it
It's not *good* for the engine, but it's much more likely to break other parts first.
Watch a few truck pulling competitions, stalling isn’t the worst, but it’s still not good.
cant hurt it in the way kan said*
Look up Steve Morris engines breaks dyno
Build a manual transmission and put it on a car I managed to make one very similar to the real thing I’m now working on a dual clutch transmission one
epic!
hi
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early
Day 14 of asking Kan to play grasslands hide & seek map
day idk of asking kan to build a rear engine ride lawn mower
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