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when a current is passed through a conductor a magnetic field is created in its surroundingswe can represent this magnetic field by drawing
notation for body axesthe standard notation for the body axis sytem for aircraft dynamics this sectionexplains the signicance of the term body axis
electric drives is a term used to describe dc and ac electric motors that provide continuous rotarmotion they are often controlled by electronic
representing vectors in different axesall positions velocities momentums and accelerations are really relative positions relative velocities
the terms roving and yarn are widely used a roving is a collection of untwisted strands wound together a yarn is a generic term for a continuous
unidirectional fabrica unidirectional ud ply is one in which all of the fibres run in one direction only a small amount of fibre or other material
modern complex systems are normally constructed by interconnecting sub-unitstherefore the systems engineer is often not too concerned about the
the conflict between too hot and too cold or too slow and too fast can be resolved using dont care statesdont care states are used wheni the
biscuits move on a conveyer through an oven where they are cooked two sensors h and c measure the temperature of the oven h 1 if the oven
1 all squares containing a 1 must be grouped2 the largest possible groups must be formed3 groups can overlap if this allows larger groups to be
installing fluent on a mws machine fluent was originally developed on unix and graphical output was provided by calls to the x windows graphics
essentially the strategy of cfd is to replace the continuous problem domain with a discrete domain using a grid domain with a discrete domain
more complicated logic circuits can be made byconnecting a number of simple logic gateshow do we decide how to connect the gates togive a particular
when designing a logic circuit with multipleoutputs it is usual to treat it as several circuitseach with one output so for our example wewould design
any function can be expressed in a truth tablea truth table lists all possible combinations ofinputs and gives the output produced in eachcasetruth
a circuit can be designed to perform manydifferent functions ega circuit has 3 inputs a b and c and 3 outputsoutput x is logic level 1 or high if one
at a particular moment in time the output of a combinational logic circuit depends uponthe inputs to the circuit at the same instantunlike sequential
digital circuits also manipulate logicalexpressioneg if account is in credit then allow phoneto make callsso a digital circuit must determine if
computers manipulate numbers - but decimalnumbers with digits 0 1 2 3 4 5 6 7 8 9 cannot be represented using two states of a digitalcircuitinstead
circuits can be designed to implement a specifictaskeg a simple circuit could compare two inputvoltages and give a high output if they matched anda
all digital devices are made from circuits whichcan be switched between two possible statesthese two states are represented by a voltagelevel at the
we now have some idea about what models are available to simulate the flow over an aerofoil andalso how to use the hanley package to apply these
it is recommended that if possible you should buy a copy of this book it will prove useful for the new fourth year configurational aerodynamics