org.opentrafficsim.core.value.conversions

Class Calc

java.lang.Object

org.opentrafficsim.core.value.conversions.Calc

public final class Calc
extends Object

Copyright (c) 2013-2015 Delft University of Technology, PO Box 5, 2600 AA, Delft, the Netherlands. All rights reserved.
BSD-style license. See OpenTrafficSim License.

$LastChangedDate: 2015-07-26 01:01:13 +0200 (Sun, 26 Jul 2015) $, @version $Revision: 1155 $, by $Author: averbraeck $, initial version Jul 4, 2014

Author:

Peter Knoppers

Method Summary

Modifier and Type	Method and Description
static DoubleScalar.Rel<SpeedUnit>	accelerationTimesTime(DoubleScalar.Abs<AccelerationUnit> acceleration, DoubleScalar.Rel<TimeUnit> time) Speed is acceleration times time.
static DoubleScalar.Rel<LengthUnit>	accelerationTimesTimeSquaredDiv2(DoubleScalar.Abs<AccelerationUnit> acceleration, DoubleScalar.Rel<TimeUnit> time) Distance is 0.5 times acceleration times time squared.
static DoubleScalar.Abs<AccelerationUnit>	deltaSpeedDividedByTime(DoubleScalar.Rel<SpeedUnit> speedDifference, DoubleScalar.Rel<TimeUnit> timeDifference) Acceleration is speed difference divided by time difference.
static DoubleScalar.Rel<TimeUnit>	speedDividedByAcceleration(DoubleScalar<SpeedUnit> speed, DoubleScalar.Rel<AccelerationUnit> acceleration) Time is speed divided by acceleration.
static DoubleScalar.Rel<LengthUnit>	speedSquaredDividedByDoubleAcceleration(DoubleScalar<SpeedUnit> speed, DoubleScalar.Abs<AccelerationUnit> acceleration) (Braking) distance is speed squared divided by two times the acceleration.
static DoubleScalar.Rel<LengthUnit>	speedTimesTime(DoubleScalar.Abs<SpeedUnit> speed, DoubleScalar.Rel<TimeUnit> time) Distance is speed times time.
static DoubleScalar.Rel<LengthUnit>	speedTimesTime(DoubleScalar.Rel<SpeedUnit> speed, DoubleScalar.Rel<TimeUnit> time) Distance is speed times time.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

speedTimesTime

public static DoubleScalar.Rel<LengthUnit> speedTimesTime(DoubleScalar.Rel<SpeedUnit> speed,
                                                          DoubleScalar.Rel<TimeUnit> time)

Distance is speed times time.
s(t) = v * t

Parameters:

speed - DoubleScalar.Rel<SpeedUnit>; the speed

time - DoubleScalar.Rel<TimeUnit>; the time

Returns:

DoubleScalar.Rel<LengthUnit>; the resulting distance

speedTimesTime

public static DoubleScalar.Rel<LengthUnit> speedTimesTime(DoubleScalar.Abs<SpeedUnit> speed,
                                                          DoubleScalar.Rel<TimeUnit> time)

Distance is speed times time.
s(t) = v * t

Parameters:

speed - DoubleScalar.Rel<SpeedUnit>; the speed

time - DoubleScalar.Rel<TimeUnit>; the time

Returns:

DoubleScalar.Rel<LengthUnit>; the resulting distance

accelerationTimesTimeSquaredDiv2

public static DoubleScalar.Rel<LengthUnit> accelerationTimesTimeSquaredDiv2(DoubleScalar.Abs<AccelerationUnit> acceleration,
                                                                            DoubleScalar.Rel<TimeUnit> time)

Distance is 0.5 times acceleration times time squared.
s(t) = 0.5 * a * t * t

Parameters:

acceleration - DoubleScalar.Rel<AccelerationUnit>; the acceleration

time - DoubleScalar.Abs<TimeUnit>; the time

Returns:

DoubleScalar.Rel<LengthUnit>; the resulting distance

accelerationTimesTime

public static DoubleScalar.Rel<SpeedUnit> accelerationTimesTime(DoubleScalar.Abs<AccelerationUnit> acceleration,
                                                                DoubleScalar.Rel<TimeUnit> time)

Speed is acceleration times time.
v(t) = a * t

Parameters:

acceleration - DoubleScalar.Rel<AccelerationUnit>; the acceleration

time - DoubleScalar.Rel<TimeUnit>; the time

Returns:

DoubleScalar.Rel<SpeedUnit>; the resulting speed

speedDividedByAcceleration

public static DoubleScalar.Rel<TimeUnit> speedDividedByAcceleration(DoubleScalar<SpeedUnit> speed,
                                                                    DoubleScalar.Rel<AccelerationUnit> acceleration)

Time is speed divided by acceleration.
t = v / a

Parameters:

speed - DoubleScalar.Rel<SpeedUnit>; the speed

acceleration - DoubleScalar.Rel<AccelerationUnit>; the acceleration

Returns:

DoubleScalar.Rel<TimeUnit>; the time it takes to accelerate using the given acceleration from 0 to the indicated speed

speedSquaredDividedByDoubleAcceleration

public static DoubleScalar.Rel<LengthUnit> speedSquaredDividedByDoubleAcceleration(DoubleScalar<SpeedUnit> speed,
                                                                                   DoubleScalar.Abs<AccelerationUnit> acceleration)

(Braking) distance is speed squared divided by two times the acceleration.
t = v / a

Parameters:

speed - DoubleScalar.Rel<SpeedUnit>; the speed

acceleration - DoubleScalar.Rel<AccelerationUnit>; the acceleration

Returns:

DoubleScalar.Rel<TimeUnit>; the time it takes to accelerate using the given acceleration from 0 to the indicated speed

deltaSpeedDividedByTime

public static DoubleScalar.Abs<AccelerationUnit> deltaSpeedDividedByTime(DoubleScalar.Rel<SpeedUnit> speedDifference,
                                                                         DoubleScalar.Rel<TimeUnit> timeDifference)

Acceleration is speed difference divided by time difference.
a = dv / dt

Parameters:

speedDifference - DoubleScalar.Rel<SpeedUnit>; the speed difference

timeDifference - DoubleScalar.Rel<TimeUnit>; the time difference

Returns:

DoubleScalar.Abs<AccelerationUnit>; the average acceleration needed to match the given inputs