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Smarter speed bump using non-Newtonian liquid

badennova.es

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Re: Smarter speed bump using non-Newtonian liquid

#121

Post by Torkel »

Torkel wrote: post #43

Speaking to a founder to a competing company ( https://www.edeva.se/en/ ) I found out that there has been many attempts at solving the problems of speed bumps: - Everybody gets bumped, not only high speed vehicles - Emergency vehicles need to slow down - Bus drivers and others can get back problems from speed bumps Most solutions break down because the forces and the wear and tear is so tremendous. The solution from…

Here's some additional information on Edeva's first export order:

https://www.highways.today/2017/09/08/dynamic-speed-bumps-cr...

David saw a surge in web-traffic and traced it back to this HN thread, and then pinged me about this :)

Re: Smarter speed bump using non-Newtonian liquid

#123

Post by celticninja »

taneq wrote: post #88
will_hughes wrote: post #85

Earlier quoted context omitted.

It's supposed to be like a rock at 40km/h anyway. You're supposed to slow down to 5-10km/h

The point was temperature dependence, not the specific made-up numbers.

The difference though would be minimal at the recommended speeds which is why it probably is not a factor. If they were designed to keep speeds at 40mph then it probably would be.

Re: Smarter speed bump using non-Newtonian liquid

#124

Post by celticninja »

bfung wrote: post #24

Can someone enlighten me on why we need a smarter speed bump? If cars going too fast are going to be damaged either way, there's no benefits on that end. If the motivation is that cars can go slightly faster overall over the bump to reduce traffic... then don't put a bump there!?!? Slow traffic will still be slow?

If this encourages everyone to drive at a similar speed then it will improve traffic throughput overall. hard braking by someone speeding can have a wave effect miles down the road.

Re: Smarter speed bump using non-Newtonian liquid

#126

Post by KozmoNau7 »

julius wrote: post #105

Mercedes has a neat solution for speed bumps as well. "Two cameras located at the top of the windscreen scan the streets and setup the suspension to absorb the bumps." https://www.youtube.com/watch?v=RQsMfHg6jIE

The Citroën C6 and the current generation C5 with hydropneumatic suspension senses the bump with the front wheels and sets up the rear suspension to absorb the bump almost completely.

Slightly more low-tech, but it works amazingly well in practice.

Re: Smarter speed bump using non-Newtonian liquid

#127

Post by ainiriand »

alex_duf wrote: post #125

I stopped watching the video when they put a sexy lady dipping a finger in the liquid. Seriously it's 2017, you're trying to sell technology and you still objectify women.

Welcome to Spain, my friend. Wait until you see what we do to animals.

Re: Smarter speed bump using non-Newtonian liquid

#128

Post by KozmoNau7 »

saagarjha wrote: post #96
smilekzs wrote: post #92

Purely out of curiousity: Is it physically possible for a sufficiently smart active suspension system defeat a conventional (i.e. solid bump on the road) speed bump?

If I remember correctly I saw a Bose demo where they were able to roll their car over speed bumps and it would stay completely level. I’m not sure if that completely negated their impact, but it looked like it from the video.

It only worked so well because they rigged the tests. The suspension was tuned for exactly each demonstration, it wouldn't work under normal mixed conditions. The system was also extremely heavy and used a boatload of power for the actuators.

A well-setup conventional suspension system works nearly as well for anything you would encounter in the real world, and it's a lot less expensive. Even Citroën (the kings of hydropneumatic active suspension) will be going with traditional suspension only from their next generation C5, despite being stalwarts of active suspension tech since the 1950s.

Having driven a C3 through southern Germany on vacation recently, I see their point. That silly little car was significantly more comfortable than my older, larger Peugeot sedan, and more comfortable than even the 1st-gen C5 my parents drive.

Conventional suspension tech has come a long, long way.

Re: Smarter speed bump using non-Newtonian liquid

#130

Post by Cthulhu_ »

ChuckMcM wrote: post #60
Torkel wrote: post #43

Speaking to a founder to a competing company ( https://www.edeva.se/en/ ) I found out that there has been many attempts at solving the problems of speed bumps: - Everybody gets bumped, not only high speed vehicles - Emergency vehicles need to slow down - Bus drivers and others can get back problems from speed bumps Most solutions break down because the forces and the wear and tear is so tremendous. The solution from…

I've always wondered what it would look like to tie one of those roadside speed monitoring trailers (they have a sign telling you the speed limit, and your speed) which were in contact with a 'speed bump' filled with hydraulic fluid. The faster you go over the limit, the harder and taller the speed bump :-) If you did this with a camera system you could avoid penalizing emergency vehicles.

Speed cameras, they earn themselves back easily. If they add warnings that there will be a speed camera it'll have the same slowing effect as speed bumps. Doesn't need to be a real camera even.
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