Video 3.4.6 The main issues with onboard electronics

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Из курса от партнера Universitat de Barcelona

Strategies for winning. Meteorology in a round the world regatta

45 оценки

Universitat de Barcelona

Strategies for winning. Meteorology in a round the world regatta

45 оценки

In this course you can learn about the mechanics of global weather, the foundations of ocean meteorology, predictive modeling and how sailors receive data via satellite and use high-performance navigation software. This course looks at oceanic meteorology and climatology through the lens of the sport of sailing. You will gain a basic knowledge of meteorology needed by sailors to take part in a regatta such as the Barcelona World Race, the only double-handed, round the world regatta with no stops. You will learn about the strategies employed during a round the world regatta and how these are put to use on board the latest ocean racing yachts.

Из урока

The sailor as meteorologist

In this module you will learn how sailors use meteorology to sail around the world and to win round the world regattas. All of their interest is focussed on the wind and they need theoretical, but above all practical, knowledge to help them to take the correct decisions at sea. Remember you can access to the help forum. If you are experiencing difficulty learning or accessing course content, or if you simply want more information.

Video 3.4.1 The mast3:53

Video 3.4.2 Onboard electronics1:26

Video 3.4.3 Satellite communications3:45

Video 3.4.4 The autopilot3:47

Video 3.4.5 The central computer3:38

Video 3.4.6 The main issues with onboard electronics5:18

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Tomàs Molina

[MUSIC]

When we talk about the installations,

weather from the electrical environment,

I mean battery power that feeds

the different systems, or we talk about electronic systems,

through sensors, processors, et cetera, et cetera.

When we talk about all this in a boat that will be submitted

to conditions at sea, it widely known

that the sea eats everything.

And so the electronics and all the components of

interconnection of systems, are greatly affected by these conditions.

When we proceed to install of all these equipments in a

boat, basically in our head we always have several aspects.

One is the electrical insulation, that is,

that there are no cuts in the cables, et cetera, et cetera.

Second, the issue of sulfation,

is perhaps the point of the biggest concern for the whole boat.

It is amazing to see the ability of sea water to sulfate a cable.

In 2 days a cable that has been subjected to a contact with salt water

loses its qualities, hardens

and has an important increase of resistance to transmit electricity.

And this can have an impact on electricity,

but in electronics it is frankly more important.

A variation in a resistance of a cable, makes the data that you transfer,

that pass through this cable, are totally wrong.

Therefore, we are very careful, very dedicated to

communication systems, interconnection of cables is totally isolated,

weather by using systems to cover the connections,

or to put them in totally watertight boxes where you have to,

when you have to make a crossing of different cables,

Many times we put it inside an IP67 box, which is a code

that indicates that you have an almost total isolation from water and humidity,

and you there make all the connections, et cetera, et cetera.

And, and a very important issue is the whole mechanical issue.

These boats will not stop moving, getting shaken,

blows, et cetera, et cetera.

Therefore when the entire installation is done,

We take into account all the subjects of mechanical traction, that is to say,

put the cables in a place where they are not susceptible of being cut,

look for locations or coverages that allow you to increase resistance,

but also that they do not serve as condensing the water, because if you put them

in a very closed tube, at the moment that the humidity, taking into account that a

boat like this will spend weeks with humidity rates of 100%,

condensation acts negatively on all systems.

Therefore, we also take great care in the issue of damp insulation.

and if all this was not enough, we try to install the lightest parts possible.

That is, if we take all the precautions for isolation,

either mechanical, either humidity,

we began to put a lot of weight on the boat.

And automatically when somebody sees the boat is like...

Can not you get rid of some of this weight?

Therefore, and at the summary level, to make an installation in

a vessel of this type, on the one hand you have to look for a type of wiring that is

sufficiently resistant to sulphation, many times

that means using stuff from aeronautical environment where they have wiring

of a very small section and therefore resist low weight,

very strong tensile strength, and we try to protect it

of a thing that is not so habitual that is the sulfation in this type of cases.

That is, we try to balance security with risk and weight.

And above all, when we design a whole

as we will locate all the wiring in the boat, we look for point 1,

which are as centered as possible so that the weights are balanced,

and above all that the lengths of cables are the shortest.

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