Package org.opentrafficsim.road.gtu.lane.tactical.following

Class SequentialFixedAccelerationModel

    • Constructor Detail

      • SequentialFixedAccelerationModel

        public SequentialFixedAccelerationModel​(DEVSSimulatorInterface.TimeDoubleUnit simulator,
                                        Acceleration maximumSafeDeceleration)
        Construct a SequentialFixedAccelerationModel with empty list of FixedAccelerationModel steps.
        Parameters:
        simulator - DEVSSimulatorInterface.TimeDoubleUnit; the simulator (needed to obtain the current simulation time)
        maximumSafeDeceleration - Acceleration; specified maximum safe deceleration

      • SequentialFixedAccelerationModel

        public SequentialFixedAccelerationModel​(DEVSSimulatorInterface.TimeDoubleUnit simulator,
                                        Acceleration maximumSafeDeceleration,
                                        Set<FixedAccelerationModel> steps)
        Construct a SequentialFixedAccelerationModel and load it with a list of FixedAccelerationModel steps.
        Parameters:
        simulator - DEVSSimulatorInterface.TimeDoubleUnit; the simulator (needed to obtain the current simulation time)
        maximumSafeDeceleration - Acceleration; specified maximum safe deceleration
        steps - Set<FixedAccelerationModel>; the list of FixedAccelerationModel steps.

    • Method Detail

      • addStep

        public final SequentialFixedAccelerationModel addStep​(FixedAccelerationModel step)
        Add one FixedAccelerationModel step to this SequentialFixedAccelerationModel.
        Parameters:
        step - FixedAccelerationModel; the step to add
        Returns:
        SequentialFixedAccelerationModel; this modified SequentialFixedAccelerationModel

      • size

        public final int size()
        Retrieve the number of FixedAccelerationModel steps in this SequentialFixedAccelerationModel.
        Returns:
        int; the number of steps in this SequentialFixedAccelerationModel

      • get

        public final FixedAccelerationModel get​(int index)
        Retrieve one FixedAccelerationModel step.
        Parameters:
        index - int; the index of the retrieved FixedAccelerationModel step
        Returns:
        FixedAccelerationModel

      • timeAfterCompletionOfStep

        public final Time timeAfterCompletionOfStep​(int index)
        Retrieve the simulation time at the end of the Nth step of this SequentialFixedAccelerationModel.
        Parameters:
        index - int; the step
        Returns:
        Time

      • computeAcceleration

        public final Acceleration computeAcceleration​(Speed followerSpeed,
                                              Speed followerMaximumSpeed,
                                              Speed leaderSpeed,
                                              Length headway,
                                              Speed speedLimit)
        Compute the acceleration that would be used to follow a leader.
        Specified by:
        computeAcceleration in interface GTUFollowingModelOld
        Parameters:
        followerSpeed - Speed; the speed of the follower at the current time
        followerMaximumSpeed - Speed; the maximum speed that the follower is capable of driving at
        leaderSpeed - Speed; the speed of the follower at the current time
        headway - Length; the net headway (distance between the front of the follower to the rear of the leader) at the current time, or the maximum distance we can cover at the current time, e.g. as the result of a lane drop
        speedLimit - Speed; the local speed limit
        Returns:
        Acceleration; the acceleration (or, if negative, deceleration) resulting from application of the GTU following model

      • computeAcceleration

        public final Acceleration computeAcceleration​(Speed followerSpeed,
                                              Speed followerMaximumSpeed,
                                              Speed leaderSpeed,
                                              Length headway,
                                              Speed speedLimit,
                                              Duration stepSize)
        Compute the acceleration that would be used to follow a leader.
        Specified by:
        computeAcceleration in interface GTUFollowingModelOld
        Parameters:
        followerSpeed - Speed; the speed of the follower at the current time
        followerMaximumSpeed - Speed; the maximum speed that the follower is capable of driving at
        leaderSpeed - Speed; the speed of the follower at the current time
        headway - Length; the net headway (distance between the front of the follower to the rear of the leader) at the current time, or the maximum distance we can cover at the current time, e.g. as the result of a lane drop
        speedLimit - Speed; the local speed limit
        stepSize - Duration; given step size, which can be longer or shorter than the provided step size in the algorithms.
        Returns:
        Acceleration; the acceleration (or, if negative, deceleration) resulting from application of the GTU following model

      • getMaximumSafeDeceleration

        public final Acceleration getMaximumSafeDeceleration()
        Return the maximum safe deceleration for use in gap acceptance models. This is the deceleration that may be enforced upon a new follower due to entering a road or changing into an adjacent lane. The result shall be a positive value. In most car following models this value is named b.
        Specified by:
        getMaximumSafeDeceleration in interface GTUFollowingModelOld
        Returns:
        Acceleration; must be a positive value!

      • getStepSize

        public final Duration getStepSize()
        Return the standard step size of this GTU following model.
        Specified by:
        getStepSize in interface GTUFollowingModelOld
        Returns:
        Duration; the standard step size of the GTU following model

      • getName

        public final String getName()
        Return the name of the car-following model.
        Specified by:
        getName in interface CarFollowingModel
        Returns:
        name of the car-following model

      • getLongName

        public final String getLongName()
        Return the complete name of the car-following model.
        Specified by:
        getLongName in interface CarFollowingModel
        Returns:
        complete name of the car-following model

      • setA

        public final void setA​(Acceleration a)
        Set value of acceleration parameter.
        Specified by:
        setA in interface GTUFollowingModelOld
        Parameters:
        a - Acceleration; value to set

      • setT

        public final void setT​(Duration t)
        Set value of desired headway.
        Specified by:
        setT in interface GTUFollowingModelOld
        Parameters:
        t - Duration; desired headway

      • setFspeed

        public final void setFspeed​(double fSpeed)
        Set value of desired speed factor.
        Specified by:
        setFspeed in interface GTUFollowingModelOld
        Parameters:
        fSpeed - double; desired speed factor

      • desiredHeadway

        public final Length desiredHeadway​(Parameters parameters,
                                   Speed speed)
                            throws ParameterException
        Determines the desired headway in equilibrium conditions, i.e. no speed difference with the leader.
        Specified by:
        desiredHeadway in interface DesiredHeadwayModel
        Parameters:
        parameters - Parameters; parameters
        speed - Speed; speed to determine the desired headway at
        Returns:
        desired headway
        Throws:
        ParameterException - if parameter exception occurs

      • followingAcceleration

        public final Acceleration followingAcceleration​(Parameters parameters,
                                                Speed speed,
                                                SpeedLimitInfo speedInfo,
                                                PerceptionIterable<? extends Headway> leaders)
                                         throws ParameterException
        Determination of car-following acceleration, possibly based on multiple leaders. The implementation should be able to deal with:
        • The current speed being higher than the desired speed.
        • The headway being negative.
        Specified by:
        followingAcceleration in interface CarFollowingModel
        Parameters:
        parameters - Parameters; parameters
        speed - Speed; current speed
        speedInfo - SpeedLimitInfo; info regarding the desired speed for car-following
        leaders - PerceptionIterable<? extends Headway>; set of leader headways and speeds, ordered by headway (closest first)
        Returns:
        car-following acceleration
        Throws:
        ParameterException - if parameter exception occurs