How does a 390 know when to tilt?

[LUKAnorthwest]

It's a question that has popped into my mind a few times. I was watching a 'how do they do it?' Episode which described how the mechanism works but didn't say how it knows when to.

Is it programmed into the unit? Or is there a tool that measures the curve in the track?


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[driver9000]

Track equipment known as a Balise transmits information to the train telling it to tilt and by how much.

 

[Strathclyder]

On the train itself, two electromechanical actuators on each car are used on each car to achieve the desired tilting angle on curved stretches of track.

 

[LUKAnorthwest]

Track equipment known as a Balise transmits information to the train telling it to tilt and by how much.

Thankyou very much, the right information i wanted.


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[Bald Rick]

Thankyou very much, the right information i wanted.


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IIRC the balises simply tell the train it is permitted to tilt. What tells the train to actually tilt is a combination of GPS and accelerometers on the vehicles, with each vehicle using the accelerometer into e vehicle in front to help it. Except the leading vehicle, where the ride is therefore not quite as good.

 

[LUKAnorthwest]

Ah so using my knowledge of roller coaster engineering. (Used to work at Alton Towers/thorpe park) balises are just like what we called permit plates. On Sonic Spinball, they have clip bars that switch a mechanism in the car to open the spin mechanism, it's then up to physics in the car to do the rest. Yea I get it. A balise is like a permit plate it's just the electronics in the train to do the tilting


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[HarleyDavidson]

It's a system called TASS.

Tilt Authorisation & Speed Supervision.

Train approaches the balise, it reads it and then the on board computers work it all out and do the actuators at just the right time.

You get speed boards on WCML with EPS on them Enhanced Permissible Speeds, where 390's are allowed to go faster than conventional stock.

 

[swt_passenger]

I understand that another key feature of the information from the balise is the distance to the next one, so each message only lasts that long, and if the next sequential balise cannot be read at the due time/distance the train defaults to no tilt.

There's a Railway Group Standard that describes the features of the system here: http://www.rgsonline.co.uk/Railway_...gnalling/Codes of Practice/GERC8517 Iss 1.pdf

Not exactly an easy read, but it covers all the points in the thread so far...