CN106406095A - Trajectory tracking control method for input-output asymmetrically limited full-drive surface ship - Google Patents
Trajectory tracking control method for input-output asymmetrically limited full-drive surface ship Download PDFInfo
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- G—PHYSICS
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- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B13/00—Adaptive control systems, i.e. systems automatically adjusting themselves to have a performance which is optimum according to some preassigned criterion
- G05B13/02—Adaptive control systems, i.e. systems automatically adjusting themselves to have a performance which is optimum according to some preassigned criterion electric
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Abstract
The invention relates to a trajectory tracking control method for an input-output asymmetrically limited full-drive surface ship. The trajectory tracking control method comprises the steps of: conducting error calculation according to a given trajectory expected tracking value; then conducting trajectory kinematic control calculation according to a trajectory kinematical equation, so as to obtain a virtual control law; approximating an uncertain item in a surface ship model by utilizing a neural network, designing an auxiliary control system to solve the saturation problem of actuating mechanisms, and then acquiring a control quantity based on a surface ship kinematical equation; and finally applying the control quantity to the surface ship model. In practical application, state quantities such as trajectory and speed of the surface ship are measured by sensors, and the control quantity obtained through calculation by adopting the trajectory tracking control method is transmitted to the actuating mechanisms such as a steering engine and a propeller, thus a trajectory tracking control function of the surface ship resisting the uncertain item, resisting disturbance and resisting asymmetric saturation problem of the actuating mechanisms can be realized.
Description
Technical field
The present invention provides a kind of asymmetric limited full driving surface vessel Trajectory Tracking Control method of input and output, and it is
Input and output are subject to the full driving unmanned water surface naval vessel of asymmetric restriction, provide a kind of tracking expectation rail of suppression external disturbance impact
The new control method of mark, belongs to automatic control technology field.
Background technology
In recent years, the motor control research for unmanned water surface naval vessel is more and more.Wherein, Trajectory Tracking Control is as one
Individual typical motor control, the work for aspects such as navigation, intelligence exploration and intelligence investigations is all of great importance.So we
Need the controller with high performance tracking trajectory capacity a kind of for unmanned water surface ship design, thus realizing surface vessel
Accurate reference track or virtual objects.But it may appear that inputting the problem of saturation, thus leading to performance in real application systems
Degeneration, lead-lag, generation undersuing or even system are unstable.Simultaneously as the propeller of surface vessel can only export
Positive power, or when executor's effectiveness partial loss, asymmetric input saturated conditions all can occur.Additionally, working as water surface warship
When a narrow river is advanced, the flight path of ship is strictly limited it is therefore desirable to consider limited by output ship by the two sides in river course
Problem.When flight path be not river course middle when, system output restriction be also asymmetrical.
Therefore invention " a kind of input and output asymmetric limited full driving surface vessel Trajectory Tracking Control method " is handle
Problem above is as point of penetration, and proposes targetedly, to solve the surface vessel that input and output are subject to asymmetric restricted problem
Trajectory Tracking Control is theoretical.Introduce bounded liapunov function, hyperbolic tangent function and Nussbaum function solution time-varying non-
The problem that symmetry inputs and outputs limit;Estimate indeterminate and the external disturbance of bounded using adaptive algorithm;Meanwhile, utilize
Instruction wave filter avoids the derivative operation of complexity.This method solve the asymmetric limited problem of input and output it is ensured that system
Asymptotic Stability, can achieve reliable track following, be that surface vessel Trajectory Tracking Control engineering provides one kind and efficiently may be used
The design meanses of row.
Content of the invention
(1) purpose:It is an object of the invention to provide a kind of asymmetric limited full driving surface vessel rail of input and output
Mark tracking and controlling method, controls engineer can to realize surface vessel in the method and resist not while with reference to actual parameter
Determine item, disturbance rejection, anti-input and output be subject to asymmetric restriction Trajectory Tracking Control.
(2) technical scheme:The present invention " the asymmetric limited full driving surface vessel Trajectory Tracking Control side of input and output
Method ", its main contents and step are:First Error Calculation is carried out by given track expectation pursuit gain;Then moved according to track
Equation carries out track kinesiology control and is calculated virtual controlling rule;Approached in surface vessel model not using neutral net
Determine item, Design assistant control system solves the problems, such as damp constraint, be subsequently based on surface vessel kinetics equation and controlled
Amount processed;This controlled quentity controlled variable is used for surface vessel model the most at last.In the middle of practical application, the state such as the track of surface vessel, speed
Amount is obtained by sensor measurement, and will be transmitted to the actuators such as steering wheel and propeller by the calculated controlled quentity controlled variable of the method,
Can achieve the anti-indeterminate of surface vessel, disturbance rejection, the Trajectory Tracking Control function of the asymmetric saturation problem of anti-actuator.
The present invention " the asymmetric limited full driving surface vessel Trajectory Tracking Control method of input and output ", its concrete steps
As follows:
Step one gives expectation pursuit path:Given desired plane position (xd,yd);Given expectation yaw angle ψd;Expect with
Track track is expressed as ηd=[xd,yd,ψd]T.
Step 2 track following Error Calculation:Calculate error z between actual path and desired trajectory1=η-ηd.
Step 3 is processed to input saturation part:Introduce smooth piecewise functionApproximate description executor's model.
Step 4 virtual controlling amount α10Calculate:Calculate virtual needed for the error eliminating between desired trajectory and actual path
Controlled quentity controlled variable α10.
Step 5 virtual controlling amount α20Calculate:Calculate virtual needed for the error eliminating between desired speed and actual speed
Controlled quentity controlled variable α20.
Step 6 system design of control law:Calculate needed for the error eliminating between executor's desired output and reality output
Controlled quentity controlled variable φ.
Wherein, the given expectation pursuit path described in step one includes:Expect that pursuit path is ηd=[xd,yd,ψd
]T, three representation in components implications are:(xd,yd) represent desired plane position, ψdRepresent expectation yaw angle.
Wherein, the computational methods of the track following error described in step 2 are as follows:
z1=η-ηd
η is actual path under inertial coodinate system for the surface vessel, η=[x, y, ψ]T, wherein, (x, y) represents water surface warship
The position of ship, ψ represents yaw angle.
Wherein, input saturation part is processed described in step 3, its computational methods is as follows:
With reference to the accompanying drawings 1, initially set up the inertial coodinate system shown in figure and body coordinate system.Thus can get surface vessel
Three Degree Of Freedom Nonlinear Equations of Motion:
Wherein, η=[x, y, ψ]TIt is the actual path on naval vessel under inertial coodinate system, (x, y) represents the position of surface vessel
Put, ψ represents yaw angle.υ=[u, v, r]TFor velocity under body coordinate system for the naval vessel, u, v, r are respectively velocity edge
The decomposition amount of hull coordinate system, represents pace, lateral velocity and yaw rate respectively.R (ψ) is spin matrix, meets
R-1(ψ)=RT(ψ):
M is nonsingular, symmetrical positive definite inertial matrix.C (υ) is centripetal matrix, and D (υ) is damping matrix.Three's table respectively
Show as follows:
B (t)=[b1(t) b2(t) b3(t)]TFor indeterminate, including not modeling indeterminate and unknown time-varying
Interference volume.Output for saturation executor and the input of system.Executor's input is defeated
The relation going out may be expressed as:
Wherein,It is the controlled quentity controlled variable not considered under executor's saturation, the input of saturation executor can be regarded as.WithIt is τ respectivelyiBound.But now input and the relation curve of output are rough it is impossible to be entered using Backstepping
Row design.Therefore define a smooth piecewise functionCarry out approximate representation executor input
Output relation.
Then the equation of motion of surface vessel is rewritable is
Wherein, It is the functional vector of a bounded,C > 0, φ are for it
Need the control law designing afterwards.
Wherein, calculating virtual controlling amount α described in step 410, its computational methods is as follows:
1) calculate the error of actual path and given desired trajectory:z1=η-ηd.
2) give asymmetric export-restriction:kcT () is system bottoming, kdT () exports the upper limit for system, then in output
Lower limit and the difference of given desired trajectory
kαi=ηdi-kci, kbi=kdi-ηdi, (i=1,2,3).
3) calculate z1Derivative:
4) design virtual controlling amount α10:
Wherein k1=diag (k11,k12,k13) for positive definite symmetrical matrix;kα1> 0, p >=0 is positive integer,
Q=diag (Q1,Q2,Q3), and
e1For the state of aid system, it is expressed as
Wherein,For the constant of a very little, ke1> 1, γ1> 0,
Δα1=α1-α10.By differential tracking filter as shown in Figure 2, can be by αi0(i=1,2) obtain αiAnd
Its derivative value
Thus the derivative operation of complexity can be avoided.
Wherein, calculating virtual controlling amount α described in step 520, its computational methods is as follows:
1) calculate the error of actual speed and desired speed:z2=v- α1.
2) calculate z2Derivative:
3) design virtual controlling amount α20:
Wherein, kα2> 0,e2With e1Similar, it is a state variable of aid system, be expressed as
Wherein,For the constant of a very little, ke2> 1, γ2> 0,
Δα2=α2-α20.
4) adaptive law design:Design adaptive lawBy the indeterminate in model with
And external disturbance passes through adaptive algorithm approximate evaluation,
Wherein γf,γσ> 0, ρ ∈ R+.
Wherein, the system design of control law described in step 6, its method for designing is as follows:
1) reality output of executor and the error of desired output are calculated:
2) calculate z3Derivative:Wherein Θ=diag (θ1,θ2,θ3),By
Extreme difficulties can be brought to design and analysis in the Θ of time-varying, introduce Nussbaum function battle array N=diag (N1(χ1),N2(χ2),N3
(χ3)),
3) design controlled quentity controlled variable φ:
Wherein k3=diag (k31,k32,k33), it is the symmetrical matrix of positive definite.
(3) advantage and effect:
The present invention " the surface vessel Trajectory Tracking Control method of the asymmetric saturation of executor ", compared with the prior art, it is excellent
Putting is:
1) this method avoids model linearization, may be directly applied to nonlinear model, and step is succinctly efficient, and can guarantee that and be
Gradually the stability of system;
2) this method can effectively solve the problem that the asymmetric saturation problem of executor, significantly improves non-due to actuator
The adverse effect that symmetrical saturation problem causes for system stability and various aspects of performance;
3) this method, by carrying out asymmetric restriction to output, can make surface vessel when narrow river is advanced, can
The track reference flight path leaning on;
4) using adaptive algorithm good inhibit the model uncertainty and external disturbance interference effect to system;
5) this method algorithm structure is simple, and fast response time is it is easy to Project Realization.
In application process, control engineer can according to actual requirement give surface vessel any desired track with corresponding
Input and output limit, and actuator will be directly transferred to by the calculated controlled quentity controlled variable of the method and realize Trajectory Tracking Control
Function.
Brief description
Fig. 1 is surface vessel illustraton of model of the present invention.
Fig. 2 is the composition frame chart of median filter of the present invention.
Symbol description is as follows:
ηdηd=[xd,yd,ψd]TFor expecting surface vessel travel track, wherein (xd,yd) represent desired plane position, ψd
Represent yaw angle.
η η=[x, y, ψ]TActual path for surface vessel;
υ υ=[u, v, r]TFor the velocity of surface vessel, u, v, r be respectively velocity along hull coordinate system point
Xie Liang;
α10α10For designed virtual controlling amount;
α20α20For designed virtual controlling amount;
α1α1For the desired speed of surface vessel, can be by α10Obtained by wave filter;
α2α2For the desired output of executor, can be by α20Obtained by wave filter;
z1z1For the error between desired trajectory and actual path;
z2z2For the error between desired speed and actual speed;
z3z3For the error between desired speed and actual speed;
B b (t)=[b1(t)b2(t)b3(t)]TFor indeterminate, including the interference not modeling power and unknown time-varying
Amount;
For not considering the system input quantity under executor's saturation;
Output for saturation executor and system input;
For a smooth piecewise function, for approximate representation executor's saturation
Model;
For a bounded function;
B B be model indeterminate b withSum;
kc(t) kcT () is the minimum export-restriction of system;
kd(t) kdT () is that the maximum output of system limits;
φ φ is system control amount;
The minima being limited by system input quantity;
The maximum being limited by system input quantity;
e1,e2e1,e2The state variable of aid system;
Estimated value for indeterminate;
Specific embodiment
Below in conjunction with the accompanying drawings, technical scheme is described further.
The present invention " the asymmetric limited full driving surface vessel Trajectory Tracking Control method of input and output ", its concrete steps
As follows:Step one:Given expectation pursuit gain
1) as shown in figure 1, with a fixing point as initial point, x-axis points to the north, y-axis points to east, sets up inertial coordinate
System;With the construction geometry center in surface vessel model as initial point, x-axis points to the head on naval vessel, and y-axis, perpendicular to x-axis, sets up body
Coordinate system.
2) desired trajectory giving is ηd=[xd,yd,ψd]T, three representation in components implications are:(xd,yd) represent that expectation is flat
Face position, ψdRepresent yaw angle.
Step 2:Calculate track following error z1
z1=η-ηd
Step 3:Input saturation part is processed
With reference to the accompanying drawings 1, initially set up the inertial coodinate system shown in figure and body coordinate system.Thus can get surface vessel
Three Degree Of Freedom Nonlinear Equations of Motion:
Wherein, η=[x, y, ψ]TIt is the actual path on naval vessel under inertial coodinate system, (x, y) represents the position of surface vessel
Put, ψ represents yaw angle.υ=[u, v, r]TFor velocity under body coordinate system for the naval vessel, u, v, r are respectively velocity edge
The decomposition amount of hull coordinate system, represents pace, lateral velocity and yaw rate respectively.R (ψ) is spin matrix, meets
R-1(ψ)=RT(ψ):
M is nonsingular, symmetrical positive definite inertial matrix.C (υ) is centripetal matrix, and D (υ) is damping matrix.Three's table respectively
Show as follows:
B (t)=[b1(t)b2(t)b3(t)]TFor indeterminate, including not modeling the dry of indeterminate and unknown time-varying
The amount of disturbing.Output for saturation executor and the input of system.Executor's input and output
Relation may be expressed as:
Wherein,It is the controlled quentity controlled variable not considered under executor's saturation, the input of saturation executor can be regarded as.WithPoint
It is not τiBound.But now input and the relation curve of output are rough it is impossible to use Backstepping
It is designed.Therefore fixed
An adopted smooth piecewise functionCarry out approximate representation executor's input and output to close
System.
Then the equation of motion of surface vessel is rewritable is
Wherein, It is the functional vector of a bounded,C > 0, φ are for it
Need the control law designing afterwards.
Step 4:Calculate virtual controlling amount α10
1) calculate the error of actual path and given desired trajectory:z1=η-ηd.
2) give asymmetric export-restriction:kcT () is system bottoming, kdT () exports the upper limit for system, then in output
Lower limit and the difference of given desired trajectory
kαi=ηdi-kci, kbi=kdi-ηdi, (i=1,2,3).
3) calculate z1Derivative:
4) design virtual controlling amount α10:
Wherein k1=diag (k11,k12,k13) for positive definite symmetrical matrix;kα1> 0, p >=0 is positive integer,
Q=diag (Q1,Q2,Q3), and
e1For the state of aid system, it is expressed as
Wherein,For the constant of a very little, ke1> 1, γ1> 0,
Δα1=α1-α10.By differential tracking filter as shown in Figure 2, can be by αi0(i=1,2) obtain αiAnd
Its derivative value
Thus the derivative operation of complexity can be avoided.
Step 5:Calculate virtual controlling amount α20
1) calculate the error of actual speed and desired speed:z2=v- α1.
2) calculate z2Derivative:
3) design virtual controlling amount α20:
Wherein, kα2> 0,e2With e1Similar, it is a state variable of aid system, be expressed as
Wherein,For the constant of a very little, ke2> 1, γ2> 0,
Δα2=α2-α20.
4) adaptive law design:Design adaptive lawBy the indeterminate in model with
And external disturbance passes through adaptive algorithm approximate evaluation,
Wherein γf,γσ> 0, ρ ∈ R+.
Step 6:Design system control law
1) reality output of executor and the error of desired output are calculated:
2) calculate z3Derivative:Wherein Θ=diag (θ1,θ2,θ3),By
Extreme difficulties can be brought to design and analysis in the Θ of time-varying, introduce Nussbaum function battle array N=diag (N1(χ1),N2(χ2),N3
(χ3)),
3) design controlled quentity controlled variable φ:
Wherein k3=diag (k31,k32,k33), it is the symmetrical matrix of positive definite.
Claims (6)
1. a kind of asymmetric limited full driving surface vessel Trajectory Tracking Control method of input and output it is characterised in that:Specifically
Step is as follows:
Step one gives expectation pursuit path:Given desired plane position (xd,yd);Given expectation yaw angle ψd;Expect to follow the tracks of rail
Trace description is ηd=[xd,yd,ψd]T;
Step 2 track following Error Calculation:Calculate error z between actual path and desired trajectory1=η-ηd;
Step 3 is processed to input saturation part:Introduce smooth piecewise functionApproximate description executor's model;
Step 4 virtual controlling amount α10Calculate:Calculate the virtual controlling needed for error eliminating between desired trajectory and actual path
Amount α10;
Step 5 virtual controlling amount α20Calculate:Calculate the virtual controlling needed for error eliminating between desired speed and actual speed
Amount α20;
Step 6 system design of control law:Calculate the control needed for error eliminating between executor's desired output and reality output
Amount φ.
2. the asymmetric limited full driving surface vessel Trajectory Tracking Control method of input and output according to claim 1,
It is characterized in that:The computational methods of the track following error described in step 2 are as follows:
z1=η-ηd
η is actual path under inertial coodinate system for the surface vessel, η=[x, y, ψ]T, wherein, (x, y) represents the position of surface vessel
Put, ψ represents yaw angle.
3. the asymmetric limited full driving surface vessel Trajectory Tracking Control method of input and output according to claim 1,
It is characterized in that:Input saturation part is processed described in step 3, its computational methods is as follows:
Initially set up inertial coodinate system and body coordinate system;Thus can get the Three Degree Of Freedom Nonlinear Equations of Motion of surface vessel:
Wherein, η=[x, y, ψ]TIt is the actual path on naval vessel under inertial coodinate system, (x, y) represents the position of surface vessel, ψ table
Show yaw angle;υ=[u, v, r]TFor velocity under body coordinate system for the naval vessel, u, v, r are respectively velocity and sit along hull
The decomposition amount of mark system, represents pace, lateral velocity and yaw rate respectively;R (ψ) is spin matrix, meets R-1(ψ)=
RT(ψ):
M is nonsingular, symmetrical positive definite inertial matrix;C (υ) is centripetal matrix, and D (υ) is damping matrix;Three represents such as respectively
Under:
B (t)=[b1(t) b2(t) b3(t)]TFor indeterminate, including the interference not modeling indeterminate and unknown time-varying
Amount;Output for saturation executor and the input of system;Executor inputs
The relation of output may be expressed as:
Wherein,It is the controlled quentity controlled variable not considered under executor's saturation, the input of saturation executor can be regarded as;WithIt is τ respectivelyiBound;But now input and the relation curve of output are rough it is impossible to be carried out using Backstepping
Design;Therefore define a smooth piecewise functionCarry out approximate representation executor input defeated
Go out relation;
Then the equation of motion of surface vessel is rewritable is
Wherein, It is the functional vector of a bounded,C > 0, φ are to need afterwards
Control law to be designed.
4. the asymmetric limited full driving surface vessel Trajectory Tracking Control method of input and output according to claim 1,
It is characterized in that:Calculating virtual controlling amount α described in step 410, its computational methods is as follows:
1) calculate the error of actual path and given desired trajectory:z1=η-ηd;
2) give asymmetric export-restriction:kcT () is system bottoming, kdT () exports the upper limit for system, then export bound
Difference with given desired trajectory
kαi=ηdi-kci, kbi=kdi-ηdi, (i=1,2,3);
3) calculate z1Derivative:
4) design virtual controlling amount α10:
Wherein k1=diag (k11,k12,k13) for positive definite symmetrical matrix;kα1> 0, p >=0 is positive integer,
Q=diag (Q1,Q2,Q3), and
e1For the state of aid system, it is expressed as
Wherein,For the constant of a very little, ke1> 1, γ1> 0,Δ
α1=α1-α10;By differential tracking filter, can be by αi0(i=1,2) obtain αiAnd its derivative value
5. the asymmetric limited full driving surface vessel Trajectory Tracking Control method of input and output according to claim 1,
It is characterized in that:Calculating virtual controlling amount α described in step 520, its computational methods is as follows:
1) calculate the error of actual speed and desired speed:z2=v- α1;
2) calculate z2Derivative:
3) design virtual controlling amount α20:
Wherein, kα2> 0,e2With e1Similar, it is a state variable of aid system, be expressed as
Wherein,For the constant of a very little, ke2> 1, γ2> 0,
Δα2=α2-α20;
4) adaptive law design:Design adaptive lawBy the indeterminate in model and outward
Adaptive algorithm approximate evaluation is passed through in portion's disturbance,
Wherein γf,γσ> 0, ρ ∈ R+.
6. the asymmetric limited full driving surface vessel Trajectory Tracking Control method of input and output according to claim 1,
It is characterized in that:System design of control law described in step 6, its method for designing is as follows:
1) reality output of executor and the error of desired output are calculated:
2) calculate z3Derivative:Wherein Θ=diag (θ1,θ2,θ3),Due to when
The Θ becoming can bring extreme difficulties to design and analysis, introduces Nussbaum function battle array N=diag (N1(χ1),N2(χ2),N3
(χ3)),
3) design controlled quentity controlled variable φ:
Wherein k3=diag (k31,k32,k33), it is the symmetrical matrix of positive definite.
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