ah listen carefully. don't lahardo sympathy you miss to the girl. ah, feel the magic discover the world around you. subscribe to dw documentary on youtube. b. ah, noise is everywhere and noise is making a sick. wrenched under all i can hear are the trans. we can sound proof as much as we like your voice. many people can't get away from the clamor. is

william evans. i'd also like to see cheaper rental units making use of could solutions like these them come. the natural world can also inspire effective solutions. i'm here guns, guns where we can really see here is that the entire bird is covered with down. and that also makes the system really quiet. alkali that our world has gotten too loud, but what can we do about it? on that quote, christian plot could be described as a noise whisper. he and his colleague honor the read one to free cities from noise . they work on behalf of local authorities and property developers. doncaster, thanks that's now calibrated to peak level. ah,

street noise in hamburg is part of daily life. more than 70 decibels of the moon. on the main roads, tens of thousands of residents were exposed to excessive noise levels. leaving here is stressful dilemma, not article of the bar let the noise reverberates in the vacant building lots. that means you can't sleep with the window open. if you want to stay healthy here, you only do have to keep all the window shut. it is of the sound penetrates deep between the rows of houses. noise is measured in decimals. the medical recommendations are a maximum of 65 decimals during the day and 55 at night. here it's 71. well beyond levels considered healthy this because noise makes this sick too much noise leads to insomnia,

high blood pressure and cardiovascular disease. acoustics, expert christian pop, wants to help reduce noise levels on main roads. but in them, but in as far as noise goes, yet in the case of people who have less money to go to live in places where rents and property prices are lower, these people are stuck and can't get out on miss. i want to make their situation more bearable and also get that message across to policy makers in a way they'll understand it. so come on. it's here. after all, leticia hold the purse strings. the critics experts are also hoping to reduce the planet at this junction. emerson will need to see if we can close this gap to quieten things down in the rear courtyard of the building. just looking out on to the street that just one day, they would really benefit resident photo. presumably the trees will have to go, but we'll managers, let's work out some castings. yes. the noise reserve rates between 2

apartment blocks entered the re court yard for 30 years christian pop in his company, lamb contour have been developing solutions for quite a life. his idea then gone to the floor plan of the adjacent building allows for it . we can erect a structure in betraying that will also incorporate apartments one apartments, the face, the interior courtyard, or the quiet side logins either sound insulation and new apartments. here, noise prevention could deliver to benefits at once christian pop is called in as a consultant to advise on similar problems elsewhere in series. for example, here, cargo, trans rumble directly past times. how can these apartment blocks be protected from rail noise or that's loud?

yeah, very loud. under his boss ard is an internationally recognized acoustics expert from siri. he's us christian pop for some help. now they're joining forces to fight the noise. zurich is a key transport up is a lot of movement and lots of noise primarily in the industrial zone to the west of the city. hello. did you hear it? short? it was loud enough from there to there and all the way up until his lost heart has been working for the count on a zurich for years. his job is to protect residents from rail noise and i'll do it again. oh, oh. what i knew was surfaces, i see around here. those are surfaces to left. they reflect, you can hear it. a cargo train is approaching soft and 2 passenger trains. yeah, that's crazy. other signs, almost within touching distance,

whom listen to how these low frequencies coming from this monster so close by, dominate the scene like a sy fy movie stain abashed. k, as in yes, those are low frequencies that can't be absorbed anywhere they reverberate along these waters. and ventilator can return from behind, like a store from the side foundation noise on the minute. every minute is the 17 meter train sides create waves of sound. it's like a wave puller mountains of noise coming through and building up again in this passage. i get even louder back there than they are here. loud noise is a registered, subjectively, glitchy, lighter sound, the more intrusive it's going to be more so at night when you're sleeping, then during the day building modifications may help you too. but what about the trains themselves?

as it was, had a credit of up to him, i must take a closer look at the sawyer. and there were many options there. the wheel track noise, for example, guns really important as a nash. in other words, on the tracks i need to have wheels that are perfectly round tracks that are really smooth and drive systems that are well soundproofed. there's potential that had been quieter trains are already a reality. and up in it, things are changing too. when planes take off, the moon is deafening. but when an olive sauce silence was her the i'll fly. so slowly and quietly that his prey,

taken completely by surprise, was as a yan dills and his colleague michelle here want to know why otto is able to fly so quietly. the to work at the gemini aerospace center in branch like they're involved in a project to make planes quieter. and new inspiration comes from nature running in hunter i for unseen a lot of holes mumps. i can hear guns got what we can see very well here. is that the entire bird is covered with down flowers. it's really, really soft all over the sun under the wings as well. went out and he's such a charmer. i'm from her an air here when he lets his feathers hang down like this on it. we can make out

a front edge structure with tiny little teeth that shouldn't be, that's something we aerodynamic engineers would call it turbulence generators. it means we can fly extremely slowly and to prevent stall. and that also makes the system really quiet our lives feathers and down. the researchers are also particularly interested in the soft trailing edge of the als, when i sticking on a brush like edge research is try and softened the rear side of an airplane link. previous experiments with the surrounded edge like this, produced a similar effect. he'll evaluate kennedy le, we're familiar with this. the rated edge solution must come. what more can we expect from the brush hoffman? therefore, the advantage of the brush is that it's actually directly aligned with the direction of flow, which more or less, eliminates the edge. in the wind tunnel is blown over the prepaid edge. it 14 meters per 2nd. the microphones record the exact points when

noise is created on the wing. the difference between the wing with and without the brush is calculated in the monitoring lab. colors make the noise differential visible bread, his lout his in him. any contour it is foolish on and a hint account we're seeing here is the contour of the wing and on the rear edge, the source of the sound in the original, where we've not yet applied a brush dodson. and now the difference, when we apply the bratia, we should see a clear reduction, and indeed you see that everything that was read before has gone away. or in other words, we've significantly reduce this sound source. you can see it very clearly. the brush itself has been very effective on the brush on the wing edge reduces sound by a 3rd research breakthroughs. light is brought to life in the hanger at the

aerospace center. together with his team professor dealt is found way to apply the soft trailing edge principal to the landing flap of the plane wing. yet some via the land to do this vice. now we've learned that by softening the transition from trailing edge to free flow, we can reduce the sound. in this instance, we haven't used brushes, or other things. we've implemented it with a material that's permeable to air flow blessing natalie are sort of sponge, but made of metal that significantly reduces noise creation on this trailing edge. so as long as i found against oddly, mina, this modification alone reduces noise by 20 percent with the potential for much more across the entire plane. there are many cool is an edges the research is can target islam then via ella marson. we think if we took all the measures together, we'd reach between $4.00 and $5.00 decibels for the entire plane. i. and that's

a considerable amount as a shrine, anesthetic ocean, a plane taking off without moore's reduction. and in comparison, a simulated takeoff with all noise which is measures class plans are possible. how cargo trains are also extremely loud. the noise is making people in the middle, ryan valley sick. boykin, schmitz, nice on his wife brita, a sound proofing. the house is again, it's her ex radio. honda low chair of the volume is really quite extreme here mostly at night. when you get those ancient cargo trains going past that squeak and rumbles you, it's really unpleasant. they said cyril noggin, in which light,

as i've had insomnia for years. when i'm lying awake in bed, all i can hear are the trains that we can sound proof as much as we like. it doesn't make any difference. your boy bought part in the middle rhine valley lies on the north south axis between rotterdam and genoa. the picturesque middle ryan valley is the eye of the needle on this rail freight corridor. every day, full 100 trains, speed through villages on both sides of the rhine. residence a demanding of 50 kilometer per hour, speed limit and night time ban and quiet. at freight trains nearly impossible targets for germany's national railway company deutsche a bon high speed passenger trains run on the same tracks as the cargo trains. and freight volumes is set to increase its slope the so called whisper breaking. provide some relief over the past 2 decades. deutscher bon has invested 220000000

euros in the retrofit. thanks to the whisper break the running surfaces of the we'll stay smooth before that become rough with every break application. this means that the wheel and the track, the quieter train, researches in switzerland are already step ahead and developing innovations beyond that with the break here, research is being carried out from the train. we'll. the future with laces incomplete is using dash from the actual will. research is designed, digital models, simulations and new quite wheels created on the computer. that's right there. a christy's expert christian pop is a frequent guest here. the project to develop

a new super train will is happening it swiss lab known as emp. located music does the jaws it looks like a loud speaker that moves. that's essentially what it is. what you starting with. we want to make models of the wheel vibrations that are as precise as possible with a base of up to now further development tended to follow the trial and error principle. and it was really time consuming on the basis of our models. we are aiming for precisely targeted optimization to, to market the advantage of this purely virtual method. it helps researchers save time and money in their quest to invent the quiet train of the future mess. you can only measure what already exists and we want to develop something that doesn't exist yet to see the vibe writing. now. that's a disc, is it? yes. versus what if you pers coach on it? that's, it is certainly better, but not as robust guy. yes, there are

a few other constraints, but sure a spoke will would be better than a full surface deflection opens yet i'm sure you'll get them and we'll be back in 2 years with pleasure. before a stout wheel makes its way to the track, this much want to be done. but already there are effective ways to further reduce rail noise. the whisper break has been the standard for years in switzerland. but for some people here, that doesn't go far enough at this factory sight, just over the board room, the northern italian town of boosters easier. thousands of we'll set a service repaired and stored. here work is underway to further improve the interplay of wheel and brake solution. disc brakes for freight trains. director leonardo for go explains people toyota device. how does that work and left breaking

the carriages with the latest innovation. avelo nick, we've got a set of wheels, but with an access it has to disc brakes on there and the carriage brakes on these desks with the brake pads need the the blanks beleaguered. the described wheel is currently the best and above all the quietest available on the market. this is because the wheel isn't break on the trade by a brake block, but on the extra discs, this is jennifer on the wheels. keeping them smooth. with disk breaks, noise is reduced by another 30 to 40 percent compared with the so called whisper break. the following simulation shows the audible difference between whisper and disparate the noise reduction is clear. refitting cargo trains. yet again,

this time changing with the brakes to describe would be the best solution right now . but it's expensive. hope from the e. u. is it too, and she'll all rally companies get on board, nor meet their hi me here will be this is only going to benefit the railway if we have a european solution. i love it. otherwise, it'll just be nice and small scale, not a europe wide solution. and that's a shame that this child disgrace, the quietest solution, fitted a. that is, until the eventual development of the even quieter spoke. we'll come by the button behind us. staples nice cause to handbook students to come up with a completely different approach to reducing noise. is up a lift above the fish market and it was always loud. come to british, i grew up in a village and i just wanted to sleep the windows open and that didn't work full

time yet the fish market got on my nerves every sunday. while at hamburg technical university, the 2 worked on further developing a system to reduce noise and founded a starter full years ago. fox and elling is an electrical engineer. he wants to make construction vehicles quieter for the people who work in them. his partner is c, e o. lucas hinkle. as tomar gloved, the 2 inventors experiment with what's known as active noise cancellation guns. analog simply explained. we cancelling out noise with counter noise. imagine it is 2 waves in the ocean hitting each other. not at that precise point where they made a particular frequencies. it's quiet until their noise cancelling system aimed to

protect construction workers from noise without headphones. one of her baby usually cries now her 3rd exactly canal the um, i guess spy large critical to loudspeakers in each of the chambers. several microphones here on the surface behind the grid and, and on the reverse. and we've got the processing unit which calculates the noise reduction signal, abolition in milli seconds. the unhealthy noise is altered less industry. and essentially we're creating a quiet zone around here where the drivers left and right is are, and within this quiet zone we're able to reduce low frequencies. and since a little c on the system aims to reduce noise by 50 percent which could make his life easier. michael shipment operates this kind of machinery after 8 hours a day that the ears take a real beating on a evening. you're toast 100 plus it's time to try out the device at

a testing site for construction machinery instruction at a moran most reduction without head fights, which are practical on construction sites. wearing them too often can result in ear infections. machine operator micro stigma is going to test the prototype under normal conditions on on. and then i just like you to go for it. just do what you always do. what links a nice big holes and use the bucket a bit. ok, we'll do about super of you go have fun. can the pounding ra produced by this 25 ton machine really be canceled out? the answer at to push the button. i mean this is how's the shot? so it's switched off at the moment or more. you can hear the muffled droning of the

engine. i shot that as soon as you switch it on. the droning has gone gone. you can still hear a bit of background noise, but this invasive droning that's gone. the sin significantly quieter. ah, well, on money you can hear the difference. that muffled droning. yeah. that humming. that's exactly what we're trying for. the low frequencies under 500 hertz, a canceled out because this machine works at very low frequencies. the spherical radius is especially large at 30 centimeters. that means if you lean forward slightly, you should still feel in effect if you lean this far forward, you won't be able to hear it any more. if you lean back again, you'll notice how the frequencies gradually fall away

on better we the without the device with the device you can leave it installed. great and thank you very much. take care to really in the we've been able to help the driver like that's not, that's exactly what we're aiming for. genuine feedback from the people who be using the device. the test was the success next year, the to entrepreneurs plan to sell their 1st noise cancelling systems at $4000.00 euro apiece. one is the best solution for reducing traffic. noise has become a reality for christian pop, a residential moist berry at this major intersection in hamburg v christy expert and his colleague oliver rick assist you glass wall. he closes off the corridor between the old and new buildings. the wall keeps noise out

in the interior courtyard, quiet order. they used a special camera similar to how well it works. oh yeah. mm hm. this little one of them are coming up. let's see if we can capture it with the camera. oh, we can hear it, especially when cars drive past the acoustic camera makes sound visible. it's used to test whether the wall is properly sealed. yellow and purple spots signal gaps in the sound barrier. the wall largely as its job with a few weeks, but it chills the courtyard from noise coming from both main roads. here we're where this structure now stands on this side that used to be the street with sidewalk parks and such the older building was unprotected.

lofty lashed klauser, the building on that street now protects this old buildings and these walls, or create a tranquil in a courtyard at the noise barrier has also created living space. 62 tenants have moved in kitchens and bathrooms faced the road with living rooms and bedrooms at the rear a quiet time even for those who live on land, city streets and can't afford a house in the country. that's when a christian pops main goals. so like as far as attack years, a lot with traffic as loud as we are experiencing a currently langer's death. while we do have good solutions here on these are privately funded and not cheap. this can, i'd also like to see cheaper rental units making use of good solutions like these are, wouldn't rosamond and for income more piece at last.

something many people are looking for then to make it happen there a whole host of innovative ideas. we can make the world a quieter place. ah ah, ah ah, [000:00:00;00]

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