Oversættelse af Tekniske Tekster - OpenArchive@CBS

Low-speed motors are unattractive because they are large, and therefore expensive. It
is usually much better to use a high-speed motor with a mechanical speed reduction
(Hughes 97: 36)
NB: Motor vs engine. I faglig sammenhæng angiver motor en electric motor, dvs. en
bevægemekanisme, der kan sammenlignes med et relæ, hvor ankeret aldrig når slutstillingen;
engine angiver en egentlig kraftmaskine; i daglig tale kan engine omtales som motor.
126
NB: pump speed [pumpens rotationshastighed] vs. pumping speed [rate of flow [volume or
mass flow rate]]. Det fortælles, hvor meget af et medium, der strømmer gennem et rør [rate of
flow] [hvor hurtigt det strømmer [velocity of flow], se under rate of til sidst i dette afsnit]:
The rig incorporates a four-stage pump that can be run at various speeds to correctly
represent the conditions encountered on site by a pump with a larger number of stages.
Sand erosiveness is monitored and adjusted in relation to pump speed as necessary,
without the need to stop the pump BIN 91
Over 10 cubic metres in volume, this incorporates a high pumping speed to simulate
space conditions (LPS) BIN 89
Opblødning speed vs. Velocity
Selv i formelle sammenhænge er forholdene dog ikke altid så afklarede som beskrevet
ovenfor. Velocity ses benyttet som en skalar, speed:
Velocity …
In precise technical usage velocity and speed are clearly distinguished, the former only
being used when the direction of motion is specified.
…
The term velocity is however often used loosely to mean speed (Illingworth 91: 511)
Her er der så en stilistisk forskel mellem speed og velocity.
Der ses endvidere eksempler på hvordan den numeriske værdi (speed) af velocity (her the
velocity of light) indsættes i en formel, hvor det ikke er aktuelt at holde rede på
vektorstørrelser:
Mass-energy equivalence (Phys.). Confirmed deduction from relativity theory, such
that E = mc 2 , where E = energy, m = mass, and c = velocity of light. Also Einstein
energy (Chambers: Dictionary of Science and Technology XX)
Lysets hastighed c optræder her blot som en konstant uden retningsindhold, formlen angiver
energimængde.