News on China's scientific and technological development.
- Thread starter Quickie
- Start date
Pretty sure I saw a spiked club in one of the ancient battle parts so this should go in the Ladakh thread.
Yeah I was referring to eddy currents.
I mentioned China using its rare earths production position as a key way of controlling the Anglos, it appears the Chinese gov. may be looking into options:
Here is the difference between the Chinese superconducting Maglev by CRRC and Japanese SCMaglev:
Here is a , at about 4:10 there is a demonstration of "flux pinning" where the simulated car (block) travels upside down under the twisted track.
- CRRC use "flux pinning", SCMaglev does not. With flux pinning, the car is locked to a fixed position above the track.
- Within its load limit it will not touch the track, nor will it be pushed off the track.
- Within its speed limit, it will not be throw off the track at turn or wind or vibration.
- CRRC is high temperature (liquid Nitrogen) superconducting, SCMaglev use low temperature (liquid Helium) superconducting. Liquid Nitrogen is much abundant and cheaper to use than Helium.
- CRRC use permanent magnet (on the track I guess), while (superconducting) electrical magnet on the car. SCMaglev uses electrical magnet on both. Permanent magnet will further save the electric bill.
- SCmaglev use magnetic repulsion on the walls of the track to keep the car from going off track. The continuous coils on the wall will emit strong EM field into the car when the coils on the car (only about 1/3 of length) moved away (breaking the closed loop). This is something certainly not friendly to the passengers.
Here is a , at about 4:10 there is a demonstration of "flux pinning" where the simulated car (block) travels upside down under the twisted track.
Last edited:
Exactly as I thought, China will start playing hardball with Biden because the blows will hurt him. Trump was impervious to this because of his cult of personality and depraved indifference to America's fate - there's no way to hurt someone who cares less about what you're hurting than you do.
That's all that need be said about this project. Zero commercial viability.
Building the track network for either will be a real headache and you'd need to plan and design for sabotage as well or at least unintentional damages caused. I suppose the Chinese one using permanent magnet tracks is harder to sabotage than the Japanese tracks. I'm surprised to learn liquid nitrogen is still the go to for superconducting. Wonder how they store it and ensure chambers are protected from damage. Must've worked out some acceptable solution but the track networks will take many, many years to build even if everything has the go ahead and goes smoothly.
As far as i know this is a university lab project unconnected with CRRC which has its own maglev roadmap based on a more conservative design.
The track (China) is using permanent magnet in ambient temperature. It is the magnet in the car being super-conducting magnet where storage and refrigeration is not a problem.
I don't get why it is a surprise. The higher temperature the better. Liquid nitrogen is the better way to go than liquid helium. So far temperature at liquid nitrogen is the highest one can get in practical terms.
You apparently did not watch the video to the end. What does the logo say?
Besides, at the every beginning, it says that this is a "engineering prototype" ready for road testing, not merely lab experiment. The car in the video is 12 tonnes in full size.
Also, remember that Southwest Jiaotong (交通) University is not just any university. Together with Beijing Jiaotong and Shanghai Jiaotong they are essentially part of China Railway (before it became a company).
