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Glossary of terms you will come across during your Phase 2 training.


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L

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Leading Hull Artificer, a rank in the Irish Naval Service.

Read more about ranks in the Naval Service here

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In the context of diesel engines, the lag stage is the time between when atomised fuel is injected into the combustion chamber and the time when this fuel begins to burn. During this time, the fuel absorbs heat from the compressed air in the cylinder. No burning, and therefore no temperature or significant rise in pressure occurs during this period. The shorter this period of time, the less diesel knock there is in the engine.

This period is more commonly referred to as delay period.

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λ A letter from the Greek alphabet, often used in automotive engineering. When used in connection with tuning a petrol engine, when Lambda = 1, this represents stoichiometric, or chemically correct air to fuel ratio of 14.7: 1. The figure for diesel is approximately 14.5:1.

The Greek Alphabet

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Laminar Flow, Turbulent Flow:

  • Laminar flow describes when a fluid moves smoothly in a system.
  • Turbulent flow describes when fluid flow is unsettled and disturbed.

Read more here.

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A laminated iron coreIron is ferrous, and it is often used to concentrate magnetic lines of force into areas where they can do the most work.

For example, in igntion coils, both the primary windings and the secondary windings are wound around a laminated iron core. Likewise the armature windings in a starter motor are wrapped around a laminated iron core.

It is important to note that there is no electrical contact whatsoever between the soft iron core and the windings. The function of the core is to concentrate the magnetic lines of force in the vicinity of the windings. The windings themselves are insulated, and the soft iron core is insulated from the windings.

The reason why the core is laminated is that, besides concentrating magnetic lines of force into areas where they do useful work, these same lines of force inevitably move across the soft iron, thus iducing electricity in the soft iron.

This induced electricity will have its own magnetic field which will always oppose the magnetic field that induced it in the first place (Lenz's Law). These magnetic fields are known as eddys or eddy current.

This magnetic opposition can have undesirable effects - it can slow down the rate of collapse of the magnetic field around primary coil windings, causing a weak spark, or it can cause significant drag in motors.

In order to minimise the effect of these eddy currents, instead of using one solid mass of soft iron to concentrate magnetic flux, we use thin strips of soft iron laminated together.

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Local Area Network: A network of computers all inter-connected. The term 'local' suggests that whilst the machines are all connected to each other (either by means of a wireless or ethernet hub or access point), they are not connected to the internet.

If you check your network connection status on your machine, it will say 'local' or 'local and internet'.

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From page to page, file downloads may be offered. For example, there is a workshop manual available for the TS400 consaw. This file is around 14 Mb., which is relatively large - the link is shown as an example below:

Workshop manual for a Stihl TS400 consaw. (Workshop manual in PDF format, large download, about 14 Mb.)

It is a large document, so the large file size is unavoidable. The reason why the 'Large download' warning is put beside the download link is that files of this size can take a little time to download.

The speed of download depends on the speed of your internet connection, so it can take from 20-30 seconds up to a couple of minutes. There is nothing wrong with the link, it just takes a little time for the file to download.

Keyword(s):
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This refers to delay time. For example, a node on a CAN bus wanting to transmit a low priority message must wait until all higher priority messages have been transmitted. This waiting time, or delay time is called latency time.
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  • Latent means 'hidden'.
  • Latent heat is heat energy which does not change the temperature of a substance, does change the state of the substance. For example, if you heat water until it boils, the temperature will rise to 1000C. As you continue to heat the water, it boils and turns to steam. The temperature remains the same. This is latent heat.
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A force is simply a push or a pull, and a lateral force is a push or a pull that comes from the side. For example, each time you sit in a vehicle whilst cornering, you experience lateral forces.

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Please note, if you want to contact the main Training Centre in Baldoyle, you need to ring 01-8167400.


If you want to contact the CP Fitters' Section, you can Contact Us by email, admin@cpfitters.info, or by telephone: 00 353 1 8167543 This number gets you through to the CP Fitters' Section, Baldoyle Satellite Unit.

Our Address is : Construction Plant Fitters' Section, Unit 116, Grange Way, Baldoyle Industrial Estate, Baldoyle, Dublin D13 CA48.
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