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Smarter speed bump using non-Newtonian liquid

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Re: Smarter speed bump using non-Newtonian liquid

#91

Post by King-Aaron »

TomMarius wrote: post #48
runeks wrote: post #39

From the first video: > “Whether you respect the speed limit or not, your car will suffer from a speed bump regardless.” Can anyone confirm this? I would assume the suspension can handle speed bumps fine at low speeds. That’s what it feels like from inside the car anyway. Couldn’t it be argued that, as we approach a speed of 0 mph, there exists a speed at which no damage is done to the car whatsoever? And, if we plac…

You still have to brake (brake pads and discs suffer for no reason), gear down (transmission suffers) and potentially move off at a low speed (clutch suffers, your wallet suffers if you go over them frequently). Even at minimal speeds (less than 20 km/h), speed bumps feel very unpleasant and I really don't like sounds my car is doing while riding over them.

Not to mention going over a speed bump unevenly can put uneven loads on ball joints and other suspension components other than just the shock absorbers.

Tie rod ends, bushings, etc can all wear out from uneven suspension load.

Re: Smarter speed bump using non-Newtonian liquid

#93

Post by grzm »

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?

Taken a step further, could LIDAR/RADAR systems detect speed bumps and inform the suspension system?

Re: Smarter speed bump using non-Newtonian liquid

#94

Post by vacri »

agumonkey wrote: post #53

Question I asked myself for years, why not use the idea in car bumpers. Maybe not fully loaded with fluids but non newtonian approach to shock absorption.

More trouble than it's worth. The current style of lightweight rubber or plastic bumper is already elastic for small collisions and absorbs some energy from larger ones, deforming as it goes. Replacing that with a comparitively complex sac of non-newtonian fluid will be more expensive to manufacture, more liable to vandalism, heavier, harder to repair, so on and so forth.

It's also potentially able to make a big mess from a small accident that a regular bumper would shake off. Jam an iron bar into a regular bumper and you'll scuff it. Jam it into a non-newtonian sac, and you might rupture it.

Re: Smarter speed bump using non-Newtonian liquid

#96

Post by saagarjha »

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.

Re: Smarter speed bump using non-Newtonian liquid

#97

Post by ghgr »

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.

Indeed, here is the video: https://www.youtube.com/watch?v=3KPYIaks1UY

Re: Smarter speed bump using non-Newtonian liquid

#98

Post by URSpider94 »

grzm wrote: post #93
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?

Taken a step further, could LIDAR/RADAR systems detect speed bumps and inform the suspension system?

Watch the Bose suspension videos; they include a car vaulting over road obstacles.

Re: Smarter speed bump using non-Newtonian liquid

#99

Post by AstralStorm »

grzm wrote: post #93
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?

Taken a step further, could LIDAR/RADAR systems detect speed bumps and inform the suspension system?

Unless you're driving a truck, suspension doesn't have enough distance to switch to soft and nullify the bump for bumps of reasonable size.

That if it wasn't super hard to change suspension properties on the fly.

Re: Smarter speed bump using non-Newtonian liquid

#100

Post by LoSboccacc »

TeMPOraL wrote: post #90
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…

Not easy to find a video of how it works on the site, but here it is: https://www.youtube.com/watch?v=eRHphB-YqN8 Here are three problems I see: - it has electronics and actuated parts - will be a maintenance issue - it can be overridden remotely - yet another thing in the city to hack for fun or profit - there's a distance between speed measuring zone and the bump zone that's big enough the device might react confus…

the live edge looks like can ding a rim of a poorly inflated tire.
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