Silencers | How do they work?

[@SALESENGLISH2020]

It is called silencer in British English and muffler in American English, the same thing. What I like about Lesics videos is that they make you realize the problem, understand the fundamental causes, and then show you step-by-step how to find a practical solution. This is the best way to start teaching science and engineering. Of course, the details must be learned from textbooks and other references, but the concept must be clear first. A big thank you to Lesics Team.

[@laurisikio]

Yup, your last point is the most important. Learn engineering doesn't even try to teach us calculation forms (or whatever they are called), actual numerical values or complicated theories. No one would watch these videos if such things were involved. The point of Learn engineering is to teach us the engineering principles and basics of certain actual real-life items, and it succesfully does so.

[@coontent-tv]

silencer itself means something, muffler is also meant by scarf muffler

[@nickharrison3748]

Schools and Colleges clutter us with Formulas & Maths...instead of the phenomenon

[@jaakkotahtela123]

@@coontent-tv silencer means that it is completely silent

[@coontent-tv]

@@jaakkotahtela123 silencer means the device which silences the loud sound but different varieties of silencers varies the sound level same applies on firearms UK people call is silencer and US people call it suppressor

[@yaswanthkadiri8870]

when you realize they animated it soo relevantly and precisely. .that the air molecules shown at 0:29 has N -- Nitrogen and O -- Oxygen written on them in 3 : 1 ratio. . !!! 🤯🤯🤯 keep up the good work. . .👍👍👍

[@dam78]

L + ratio

[@hupa1a]

haha that is so detailed!

[@fallinglxght]

🥵

[@Phyjix]

when you realise that this is completely wrong...(completely inaccurate analogy) Air particals never stays at same position neither they want to come back at same position, Air particals always move in different directions and collide with other Air particals, their movement will always be random to observer, the sound is just more collisions in a perticular area, the collision then collide with nearby surrounding particals in all directions and since there are countless other particals these collisions fades out after a while, meaning collisions transfer to more and more particals.

[@playerscience]

@@Phyjix You're absolutely right! But still gotta admit that they've put a lot of details in video. A lot of the anologies in physics are very inaccurate, but still we use them, because those anologies helps us understand these phenomena easily.

[@Fivizzz]

I liked the part where you push children towards concrete walls. Engineering is fun! :D

[@vinayakhuracan5182]

Broken knees🤣🤣🤣

[@JonMartinYXD]

@@vinayakhuracan5182 Yeah look at the middle kid, legs like toothpicks. Would snap even against the rubber wall.

[@vinayakhuracan5182]

@@JonMartinYXD 🤣🤣

[@farihareza6464]

Me too. It brings the concentration in an interesting way!

[@aryonugroho8711]

I wanna find out if that really happened correctly in real life

[@JessiOz2k07]

As an Acoustic Engineer (1 out of only 5 in Australia), who designs silencers for super large mining dump trucks n dozers, I really enjoyed this video. However, this video is more about generation of noise and much less about ‘how muffler or silencer’ works. Also the description about how fibreglass works in absorbing sound waves is wrong. Plus the video only talks about one type of muffler and that too the simplest form. The one you explained is a simple ‘dissipative’ type. Most cars n motorcycles dont even have these. Fibreglass doesnt last long enough to be used in vehicle mufflers. Reactive mufflers are used instead.

[@MelloCello7]

"Also the description about how fibreglass works in absorbing sound waves is wrong. " Care to elaborate on what he mightve gotten wrong??:o

[@pepe6666]

yeah sound guy here too. know about sound but not mufflers. i felt that the explanation of the muffler was a bit short. the animation drawed what looks like a tesla valve or something - with sound going backwards & cancelling itself. my thought was that yes most of the sound would go straight through & out the hole. is that right?

[@Phyjix]

@@pepe6666 thats not how sound works, (see last part) i m not an engineer but i think muffler sould make air particals collide more and more randomly with flexible material which absorbs these collisions which sould produce more heat since heat is also just collisions. these should work much more like the triangular fome that sound studios use. [ about Sound ] "they used completely inaccurate analogy Air particals never stays at same position neither they want to come back at same position, Air particals always move in different directions and collide with other Air particals, their movement will always be random to observer, the sound is just more collisions in a perticular area, the collision then collide with nearby surrounding particals in all directions and since there are countless other particals these collisions fades out after a while, meaning collisions transfer to more and more particals."

[@niewyimaginowany87]

About sound they just simplified things to understand, also usually that air particians stay more or less in place (example with speaker) and that generalization is accurate enough. Its like a people on concert, they are moving and staying under scene at the same time ;)

[@jstone1211]

Roughly 20+ years ago, I worked on the Liebherr super haul truck to develop a muffler to reduce the 3500 HP engines noise as the mining site was near a housing community. The muffler was successful...significantly reduced the noise...the government was happy I guess....now your government has gone mad...

[@OperationDarkside]

Seems like some neighbors replaced their fibreglass with solid rock.

[@AceroCarbono]

Nah, they used air

[@guitarsandexplodingdinosau7821]

Boo hoo. My nieghbor has freedom to do things I dont enjoy.

[@DanielinLaTuna]

Interestingly enough, most internal combustion motors require some level of back pressure to operate correctly. I, and my friends, learned this in high school when we removed the mufflers (“silencers”) from our hot rods in order to get more horsepower, and instead saw diminished power…

[@jirislavicek9954]

That's why there is so much fuss about tuned exhausts in high performance engines / racing industry.

[@siontheodorus1501]

what is the reason we need back pressure, i mean it just makes the exhaust gas back to the cylinder. i believe the reduce in power when you removed the mufflers was because you also reduce the exhaust scavenging, and therefore the exhaust gas from a combustion that happens from another combustion didn't get sucked completely

[@DanielinLaTuna]

If there's no back pressure, the fresh air and fuel will not only sweep out the exhaust gasses, but they will also begin to exit with the exhaust gas, resulting in a loss of fuel and air which reduces efficiency. If the back pressure is too high, the exhaust gasses can't all be removed by the fresh charge.

[@techalyzer]

Dunno about that, my muffler opened up because rust ate away the metal sheet it's made of (2006 car) and now the car flies... definitely an obvious power increase.

[@DanielinLaTuna]

@@techalyzer most likely you’re still getting the choking effects from the catalytic converters. Reducing back pressure is a winning strategy, in many cases; that’s why large bore exhaust systems with properly tuned mufflers work. In your case I suspect the factory exhaust was very restrictive, for better emissions and cheaper manufacturing.

[@umeshsatapathy8953]

Precisely elaborated... I didn't even have to replay ... just in one go... Thank you making this complex phenomenon so simple to understand.

[@wildking7300]

88777ĺlllllllllllll

[@JuicyJenitals]

This world is rapidly passing away and I hope that you repent and take time to change before all out disaster occurs! Belief in messiah alone is not enough to grant you salvation - Matthew 7:21-23, John 3:3, John 3:36 (ESV is the best translation for John 3:36) if you believed in Messiah you would be following His commands as best as you could. If you are not a follower of Messiah I would highly recommend becoming one. Call on the name of Jesus and pray for Him to intervene in your life - Revelation 3:20. Contemplate how the Roman Empire fulfilled the role of the beast from the sea in Revelation 13. Revelation 17 confirms that it is in fact Rome. From this we can conclude that A) Jesus is the Son of God and can predict the future or make it happen, B) The world leaders/nations/governments etc have been conspiring together for the last 3000+ years going back to Babylon and before, C) History as we know it is fake. You don't really need to speculate once you start a relationship with God. Can't get a response from God? Fasting can help increase your perception and prayer can help initiate events. God will ignore you if your prayer does not align with His purpose (James 4:3) or if you are approaching Him when "unclean" (Isaiah 1:15, Isaiah 59:2, Micah 3:4). Stop eating food sacrificed to idols (McDonald's, Wendy's etc) stop glorifying yourself on social media or making other images of yourself (Second Commandment), stop gossiping about other people, stop watching obscene content etc. Have a blessed day!

[@Gameplayery]

love how that last "THANK YOU" was passive-aggressive, as to tell the BIKERS to NOTBE SO LOUD

[@Ginto_O]

i remember disassembling muffler on my scooter and i think there were no fiberglass. Also the design was different. If i remember correctly, there were couple chambers inside connected with the small pipes.

[@sepg5084]

Then your muffler is of the chambered type. Glass pack type mufflers are the ones that have fiberglass on them.

[@qq84]

That's the design with the cambers, that is used in suppressors for guns. The advantage is that it lasts much longer and it's much more sturdy (that's why its used for guns). On the downside it's heavier and needs more volume, that's why it's usually not used on motorcycles anymore. * He should have also explained that. * Furthermore ("sport") mufflers for motorbikes are often created to break partially down after a short period of time and make much more noise then they're supposed to. That's much harder with the sturdy design.

[@cereal-killer4455]

@@Styrofo4m because motorcycle are hobby objects and not ubiquitous every machines like cars

[@JessiOz2k07]

Yes. Those are called reactive type mufflers. They work by reflecting the sound waves back towards the sound source not by absorbing them.

[@SaveThePurpleRhino]

@@cereal-killer4455 Except in S.E Asia, South Asia and Africa. There, they are the main transport means for the masses

[@horizonr639]

Make videos on these topics 1 how Hydrolic power steering works 2 How cylinder lubrication works in 4 stroke engine so efficiently 3 how Anti sway bar or anti role bar works 4 how EVAP system works 5 how electric FI system works 6 how two stroke diesel engine works

[@laurisikio]

Exactly what I've been asking, too!

[@siontheodorus1501]

i believe they already did the power steering including the EPS one, if not then there are others who made the animation too

[@dannyr2976]

To be honest I did think this was about weapon silencers.

[@riba2233]

Similar tech

[@slimxshady6111]

Me too lol

[@ExtendedDelta]

Same

[@slipknnnot]

@@riba2233 not even close

[@riba2233]

@@slipknnnot similar principle (breaking sound waves) but different execution

[@গুপ্তচর-ণ৬ঠ]

best engineering channel in the world node out..... every completed topic explanation was so easy...

[@sushilgharat2264]

We only heard the silencer sound but the physics behind it is very much intresting... Great engineering..👍

[@melody3741]

The fact that the exhaust is what makes the Extremely Loud engine noise and not the actual explosions happening in the engine is completely mind blowing. I would have never even thought that was the case.

[@peeqo]

Well no, the exhaust makes the explosions happening in the engine quieter, so therefore running it without one or a straight pipe is just the natural non dampened sound of the engine

[@dovilacus]

@@peeqo either you didn't understand the guy or you didn't understand the video. Exhaust pulses are caused by the difference in pressure between the cylinder and the exhaust duct, not the combustion process itself. Since a good part of the thermal energy released is used as work, exhaust sound compounds a small portion of the energy that is rejected by the engine.

[@captainotto]

It's worth mentioning that a significant portion of the sound energy is radiated through the engine. Those combustion pulses do propagate through the walls of the engine, especially when it comes to air cooled engines. This is immediately obvious when you put an exhaust duct into a bucket of water. The remaining noise observed is now mostly due to radiation directly from the cylinder block and head, which themselves are vibrating just like the air, albeit in a much lesser form.

[@ebinmaine]

​@@captainotto Excellent point and thanks for bringing it up.

[@ebinmaine]

​@@dovilacus The video is correct by strict definition. But.... It doesn't take into account that most camshafts create a scavenging effect by getting the exhaust valve open during the last of the ignition stroke. Some of the noise we hear IS actual burning fuel escaping the exhaust system.

[@mrED123]

Summarizing sound waves, engine combustion, and material properties all in one video! And in less than 7 minutes! That’s why I love this channel

[@joshuahernandez698]

Im

[@okithdesilva129]

Thank you so much for this video and all your videos which helped me a lot to learn engineering by myself and inspiring me to become a engineer

[@BryanTorok]

When I saw the title, "Silencers..." I thought you were referring to the type that are attached to the muzzle of a firearm, also known a suppressor. And, while glass pack mufflers are used on some automobiles (and possibly motorcycles) they generally have less sound suppression and longevity than those that use baffles and chambers to capture, slow, and even out the high pressure pulses in sounds.

[@kevinfernandez9999]

American right?

[@BryanTorok]

@@kevinfernandez9999 Well, yes.

[@sudhirravuri5623]

Thank you Lesics for explaining the subject with general example. Very much understood.

[@jhonnythejeccer6022]

4:00 explains energy propagation with children slamming their feet into each others backs lol

[@BariumCobaltNitrog3n]

This explains glass packs, and without you knowing it, gun suppressors. This video is actually about the ones you put on guns, not mufflers on an infernal combustion engine. Most silensers (in the UK and AUS, their spelling too) or mufflers use baffles and chambers to make them quieter. Imagine a very crowded room, and suddenly a group of people rush in one door and try to get out another. There are no exit signs and the doors are not in sight. As the group bumps into all these people already in the room, they lose all their initiative, and start chatting up the good looking people. That's a muffler. Oh they find their way out eventually, with the help of security.

[@kkhalifah1019]

Stock silencers are always the baffle type as it is the quietest because it doesn't provide a direct flow for the exhaust. The exhaust and sound get bounced around the different baffled compartments before they exit. This absorption type is always the preferred aftermarket replacement since it allows a direct, straight path to the exit for the exhaust, increasing flow and noise while reducing weight through its simpler construction.

[@mikesgenerators2068]

If you were a lecturer in my university level, trust me by now I would be a PhD level holder, you have a true teaching spirit and that's the reason I always enjoys your teachings more and more. Kindly seek how you can attach mpesa payment process on your support program scheme

[@suhaybxasan7725]

I dont know how i thank to you my teacher,please can you imaging how much brains you made larger and bright and built please keep going and work for your people the history will write you

[@okithdesilva129]

It's amazing how silencers work

[@Humongous_Pig_Benis]

Thank you for this great video, as always. It would be nice to see you exploring the phenomena behind car's mufflers and the way they use phase opposition to reduce noise. Please consider this suggestion, thank you!

[@adityaraj8512]

No words to explain how great it was

[@supportChildren-g8b]

My favorite educative channel, it has content.

[@ravijangid1512]

This is not possible to transfer energy by swinging at last point of contact Velocity tends to zero and kinetic energy change into pendulums potential energy So transfered energy is veri low Utherwise your all of videos are great I love to see them Great explanation

[@victox63]

I was looking for this comment, I had to pause the video and think this to myself

[@farihareza6464]

How well and interestingly it’s described! Wonderful!

[@brotha.b]

the children on the swing analogy is CRAZY

[@arjumandvillagelife]

interesting❤❤👍 thank you😊 love&respect from Gilgit-Baltistan😊

[@TheCuriousOrbs]

"So if your bike has gotten noisy, it's time to replace the children in the muffler"

[@AreebKhan_7720]

Best Channel for the knowledge of Physics

[@neodygaming2979]

6:40 Oh No !! thank you !!

[@dipankarchatterjee8809]

Thanks all of you for such simple presentation.

[@Nathan-fl6is]

Placing a concrete wall in front of swinging children made me laugh harder than it should have

[@pankajkaurav3155]

You content is always outstanding

[@LifeStraws]

Respect Sir, Top class explanation, great work. I hope that I can learn from you whenever I get a chance. Thank You So Very Much

[@rajchoudhary4349]

Nice narration..!! Amazing engineering for the problem statement

[@123_thenumber5]

Great video 💪 Could you also do a video about reflection silencer, please?

[@amansgangwar]

This channel is so much informative and its free

[@yuremendes1]

Rapaz...aqui eu aprendo inglês e como as coisas funcionam! Este canal é muito bom!

[@zayar7]

Thank you very much.This video animation made me to understand all this easily

[@G0j0_S4TUR0]

Please make a video about - how a pendulum clock works... 🙏🙏

[@aipy5147]

Outstanding visual explanation! Great going!

[@foureyedchick]

I thought you were going to discuss gun silencers, not mufflers.

[@piyak.4774]

The best explanation as i can see.

[@prasadmarkad605]

Thank you for such a amazing video.

[@user-lj6gk4lv9s]

Cheap noisy aftermarket mufflers are made like this, all modern mufflers use 3 chamber noise cancelling designs, that send the noise on different paths so the high pressure can collide with the low pressure zones.

[@josephmarsh8235]

Very interesting design for motorcycles. Do some cars use this too? Especially noisy straight piped hyper cars like Lamborghini's or Ferrari's!

[@androiduberalles]

All of them do. Cars that are straight piped do not come like that from the factory.

[@abysswalker2403]

surprisingly enough the muffler in a lamborghini aventador is massive compared to many other cars mufflers, yet they are still much louder because of the engine

[@svause]

In the vernacular with which I am most familiar, muffler is for a vehicle (or cold neck), and silencer is for something that fires projectiles.

[@mickyguy157]

i think both use a similar technique to reduce sound

[@argentosebastian]

Idk but for me the best type of muffler is the straight pipes 😂

[@betruly7894]

Best video i saw that explain this so well. I'm a subscriber now 👍 the robotic voice is so perfect , please keep up the good work Now back to your explanation i found an error that all rider agree with me. So when the exhausts pipes start making noises (Potato Potato) it is time for fun and definitely not the time to replace them 🤣🤣

[@gauravspehia8653]

Now this is called great content creation by Indians.

[@JuicyJenitals]

This world is rapidly passing away and I hope that you repent and take time to change before all out disaster occurs! Belief in messiah alone is not enough to grant you salvation - Matthew 7:21-23, John 3:3, John 3:36 (ESV is the best translation for John 3:36) if you believed in Messiah you would be following His commands as best as you could. If you are not a follower of Messiah I would highly recommend becoming one. Call on the name of Jesus and pray for Him to intervene in your life - Revelation 3:20. Contemplate how the Roman Empire fulfilled the role of the beast from the sea in Revelation 13. Revelation 17 confirms that it is in fact Rome. From this we can conclude that A) Jesus is the Son of God and can predict the future or make it happen, B) The world leaders/nations/governments etc have been conspiring together for the last 3000+ years going back to Babylon and before, C) History as we know it is fake. You don't really need to speculate once you start a relationship with God. Can't get a response from God? Fasting can help increase your perception and prayer can help initiate events. God will ignore you if your prayer does not align with His purpose (James 4:3) or if you are approaching Him when "unclean" (Isaiah 1:15, Isaiah 59:2, Micah 3:4). Stop eating food sacrificed to idols (McDonald's, Wendy's etc) stop glorifying yourself on social media or making other images of yourself (Second Commandment), stop gossiping about other people, stop watching obscene content etc. Have a blessed day!

[@whirvis]

This is truly a compressed air moment

[@phitrantruong3125]

Illustration is so empressive

[@NAYAN-t3e]

No one had ever explained the such indepth critical insights about this topic on youtube ❤️🙏.

[@HavokTheorem]

"Higher the exhaust pressure, more will be the movement" This sentence is wrong or at least awkward in English. I would rewrite it as: "The greater the exhaust pressure, the greater the movement." When making comparisons, keep the structure of each example the same to not confuse the listener.

[@丁日光]

this voiceover is an american and the writer is indian so maybe only wrong in your dialect

[@cr7savage709]

From that first analogy at 0:27 I understood it sll without a word

[@suhaibahmad05]

The Animation🔥🥵💖

[@bharathvigneshsaichannel3758]

Your content are just fabulous❤️🤩🤩🤩💯

[@GururajBN]

Very instructive video and lucid explanation. I regret that I didn’t attempt to understand such a common place device. Many thanks. Is the silencer any different in a car? I had read something about Standing Wave formed in the exhaust pipe, though I can’t recall the specifics. I shall be grateful for some explanation on the standing wave.

[@Zalethon]

Those metaphors with the kids on swings were wild

[@misusatriyo]

3:44 ah yes, my favorite type of medieval torture. Death by decibels.

[@leoseries]

This concentrates on the sound deadening properties of a silencer only. When I used to mess about with these things years ago. All of the silencers that I used made an engine perform better than having no silencer at all.

[@greatalberto_tech]

Also on point. Thanks so much Lesics, I like your style of teaching Engineering. Good job!!!!

[@scienco-gratia]

Good keep uploading this type of stufg

[@saikondavarada289]

My Mind was blown away when he tells the example of swing. Excellent explanation 👌 👏 👍 😍😍😍😍

[@Alexxx95_H]

Simple and effective design!

[@ZackWolfMusic]

A SILENCER ON A GENERATOR WOULD BE NICE!

[@rockets4kids]

Most generators do have silencers. The problem is that the ones fitted to most small generators aren't very good. But the reason those mufflers aren't very good is because the block itself also generates considerable noise. This is because portable generators need to be light. If the engine block was thicker it would be quieter, but then it would be heavier. And also more expensive. You could put the entire generator inside of a soundproof box, but then you would need to tap energy from the generator to drive a fan to keep the inside of the box cool. So now you are adding weight, and cost, and reducing efficiency. Then there are even more complicated issues such as needing to maintain a constant RPM regardless of load in order to maintain 60 Hz output frequency. You could add an inverter here, but again that adds cost and limits peak power output.

[@techmaster6587]

Nice Animation.. I understood everything.. Thnxx

[@okithdesilva129]

Imagine the automobile world without the silencer

[@gezzapk]

Thailand

[@educhan3909]

@@gezzapk awowkwok, good description

[@freddonald8210]

*It requires money to make money this is the best secert I have ever heard we don’t make money we make multiple money..*

[@ericsonbooker8026]

Take it from one who has it and buy a house in Missouri and dream Wrangler with forex trade profits. I started with Mr Ben Harris of financial education and he has been my handler and guider for the past years

[@Deepblue744]

This was very interesting and informative. I just learned something new today. 👍

[@wiskifrac]

Main explanation is wrong: Sound reduction works exactly because sound pressure wave DO NOT travel with the fluid, but better they travel into it and way faster than it. As sound waves enter the muffler they start to expand also into the rockwool part and bounce everywhere at 550 m/s (speed of sound at 500 °C). The multiple swirls the air does into the rockwool cavities and passages "activates" the viscosity of the air, this way in part sound cancels out and in part transfer its kinetic energy to the rockwool fibers. As consequence sound is absorbed and dissipated in its propagation through the silencer. This causes the overall sound reduction.

[@abdullaharslan3655]

Or, in a furnished room, the sound does not echo, but the bath also echoes. In the same way, wool is placed on the back of a speaker so that the sound pressure at the rear does not affect the front.

[@yoyo_corona_gaming4658]

Please make a video on gun silencer

[@ApurvaKhartad]

Very well explained. Thanks.

[@shreesha3586]

Children's example was very easy to understand

[@allankyamanywa2904]

Interesting and well described

[@noamgottfeld1237]

Thank you so much for this very good video ...helps me alot..

[@rasifnur]

fantastic analogy

[@mbonuchinedu2420]

love you. Clean description. 😝❤❤❤💙💙

[@ak123-k6d]

Great i doesn't have words to say really amazing keep going ♥️♥️♥️🔥🔥🔥

[@aliali-cv4xg]

Best channel ever❤️

[@fullStackInKannada]

Very nice, interesting, thank you so much for the video.

[@regiltube7932]

That's why 4 valves; 2 Intake 2 Exhaust in 1 Cylinder is very important as it offers more intake outake output to improve engine performance.

[@caovodat1456]

Thanks for making such a great video. It's pretty easy to understand. I'll start modifying my bike accordingly now :v

[@tallen917]

Excellent presentation. Short, concise, and to the point. Nice work!

[@jvitor.csantos]

Like always, another great video. Thank you.

[@mitukumar6066]

Amazing vedio ,and explanation, thanks lesics for such type of informative vedio

[@hupa1a]

Great one! Thanks a lot for those pretty animations and explanation

[@ThunderWolfUE]

Exactly what I was looking for

[@RonakDhakan]

Related to this and a bit more advanced is the catalytic converter.

[@BagusBangets]

It sounds good indeed.

[@juperrr]

Very good video. You should think about doing one about Hidraulic Tappets.

[@prasenjitpaul9036]

Pretty cool explanation

[@anjanaimesh3258]

Please make a video about how radio signal controlling works 😍

[@guitarsandexplodingdinosau7821]

I like how they are calling a scooter a motorcycle.

[@gustavoguti27]

Sadly my neighbor thinks it's cool to remove it from his motorbike