CN109144087A - A kind of calm method of the adaptive set time posture of rigid aircraft considering actuator constraints problem - Google Patents
A kind of calm method of the adaptive set time posture of rigid aircraft considering actuator constraints problem Download PDFInfo
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D1/00—Control of position, course or altitude of land, water, air, or space vehicles, e.g. automatic pilot
- G05D1/08—Control of attitude, i.e. control of roll, pitch, or yaw
- G05D1/0808—Control of attitude, i.e. control of roll, pitch, or yaw specially adapted for aircraft
- G05D1/0816—Control of attitude, i.e. control of roll, pitch, or yaw specially adapted for aircraft to ensure stability
- G05D1/0825—Control of attitude, i.e. control of roll, pitch, or yaw specially adapted for aircraft to ensure stability using mathematical models
Abstract
A kind of calm method of the adaptive set time posture of rigid aircraft considering actuator constraints problem, for with external disturbance, rotary inertia is uncertain, the rigid aircraft attitude stabilization problem of actuator saturation and failure, using sliding-mode control, in conjunction with adaptive technique, nonsingular set time adaptive controller is devised;The design of nonsingular set time sliding-mode surface not only guarantees the set time convergence of system mode, but also solves singular value problem;It is not always known in addition, adaptive updates rule is used to estimating system, therefore always uncertain upper bound information is not necessarily to be known in advance.For the present invention in external interference, rotary inertia is uncertain, under the factor of actuator saturation and failure, realizes the control of the set time uniform ultimate bounded of system mode.
Description
Technical field
The present invention relates to a kind of calm sides of adaptive set time posture of rigid aircraft for considering actuator constraints problem
Method is especially in the presence of external disturbance, and moment of inertia matrix is uncertain, and the rigid aircraft posture of actuator saturation and failure is calm
Method.
Background technique
Rigid aircraft attitude control system reliably plays important angle in movement in the health of rigid aircraft
Color.In complicated space environment, rigid aircraft attitude control system will receive various external disturbances and rigid aircraft
In long-term continuous task, failures such as existing aging and failure etc. influence.In order to effectively maintain the performance of system, need to make it
There is stronger robustness to external disturbance and actuator failures;In addition, rigid aircraft there is also moment of inertia matrix not
It determines, therefore controlling saturation is also the frequent problem of aircraft.In conclusion rigid aircraft in the task of execution, needs
Want a kind of makes system stable convergence, high-precision fault tolerant control method in a short time.
Sliding formwork control is considered as an effective robust control side in terms of solving systematic uncertainty and external disturbance
Method.Sliding-mode control has algorithm simple, fast response time, excellent to extraneous noise jamming and Parameter Perturbation strong robustness etc.
Point.TSM control is a kind of improvement project of traditional sliding formwork control that stability in finite time may be implemented.However, existing
Finite time technology estimation convergence time need to know the initial information of system, this is difficult to know for designer.Closely
Nian Lai, set time technology are widely used, set time control method and existing finite-time control method phase
Than, have without knowing the initial information of system, also can conservative estimation system convergence time superiority.
Self adaptive control refers to the dynamic that controller can correct itself control parameter to adapt to system itself with external disturbance
Characteristic makes system be optimal control to obtain satisfied dynamic property.This method is not only suitable for linear system, is also applied for
Nonlinear system is controlled mainly for the uncertainty of system.The research object of self adaptive control is that have to a certain degree
The uncertain and easy system by external environmental interference.For these reasons, many self-adaptation control methods are used to control
Spacecraft system.
Therefore, set time sliding formwork control technology and self-adaptation control method are effectively combined, reduce external disturbance and
The set time control of rigid aircraft posture is realized in influence of the system parameter uncertainty to system control performance.
Summary of the invention
In order to overcome the problems, such as unknown nonlinear existing for existing rigid aircraft attitude control system, the present invention provides one
Kind considers the calm method of the adaptive set time posture of rigid aircraft of actuator constraints problem, there is external do in system
It disturbs, rotary inertia is uncertain, in the case where actuator saturation and failure, realizes the set time uniform ultimate bounded of system mode
Control.
In order to solve the above-mentioned technical problem technical solution proposed by the present invention is as follows:
A kind of calm method of the adaptive set time posture of rigid aircraft considering actuator constraints problem, including it is following
Step:
Step 1, the kinematics and dynamics modeling of rigid aircraft system is established, system mode and control ginseng are initialized
Number, process are as follows:
The kinematical equation of 1.1 rigid aircraft systems are as follows:
Wherein qv=[q1,q2,q3]TAnd q4The respectively vector section and scalar component and satisfaction of unit quaternionq1,q2,q3Respectively it is mapped in rectangular coordinate system in space x, y, the value in z-axis;It is q respectivelyvAnd q4's
Derivative;For qvTransposition;Ω∈R3It is the angular speed of rigid aircraft;I3It is R3×3Unit matrix;It indicates are as follows:
The kinetics equation of 1.2 rigid aircraft systems are as follows:
Wherein J ∈ R3×3It is the rotator inertia matrix of rigid aircraft;It is the angular acceleration of rigid aircraft;u∈
R3With d ∈ R3It is control moment and external disturbance;D=diag (D1,D2,D3)∈R3×3It is 3 × 3 symmetrical diagonal actuator efficiency
Matrix meets 0 < Di(t)≤1, i=1,2,3;Sat (u)=[sat (u1),sat(u2),sat(u3)]TIt is generated for actuator
Practical control moment, sat (ui) it is the actuator with saturated characteristic, it is expressed as sat (ui)=sgn (ui)min{umi,|ui|,
umiFor the control moment that maximum provides, sgn (ui) it is sign function, min { umi,|ui| be both minimum value;In order to more square
Just expression control constraints, sat (u) are expressed as sat (u)=Θ (u) u, Θ (u)=diag (Θ1(u),Θ2(u),Θ3(u))
∈R3×3For 3 × 3 symmetrical diagonal matrix, Θi(u) it indicates are as follows:
Meet 0 < ξ≤min (DiΘi(u))≤1, min (DiΘiIt (u)) is minimum value, i=1,2,3, ξ be unknown normal
Number;Ω×It indicates are as follows:
1.3 rotator inertia matrix Js meet J=J0+ Δ J, wherein J0With Δ J respectively indicate J nominal section and uncertain portion
Point, then formula (4) is write as again:
Further obtain:
1.4 pairs of formulas (1) carry out differential, obtain:
Wherein ΩTFor the transposition of Ω;For qvSecond dervative;For J0It is inverse;It indicates are as follows:
Respectively q1,q2,q3Derivative;
Step 2, for external disturbance is had, rotary inertia is uncertain, the rigid aircraft system of actuator saturation and failure
System, the sliding-mode surface of design, process are as follows:
Select nonsingular set time sliding-mode surface are as follows:
Wherein, With sgn (qi) it is sign function, λ1> 0, λ2> 0, a2> 1, For qiLead
Number, i=1,2,3;
Step 3, nonsingular adaptive set time controller is designed, process is as follows:
3.1 design set time controllers are as follows:
Wherein S=[S1,S2,S3]T,Γ=diag (Γ1,Γ2,Γ3)∈
R3×3For 3 × 3 symmetrical diagonal matrix;K1=diag
(k11,k12,k13)∈R3×3For 3 × 3 symmetrical diagonal matrix, K2=diag (k21,k22,k23)∈R3×3It is symmetrical diagonal for 3 × 3
Matrix, K3=diag (k31,k32,k33)∈R3×3For 3 × 3 symmetrical diagonal matrix, k11,k12,k13,k21,k22,k23,k31,k32,
k33For normal number,Respectively c1,c2,c3, the estimation of ξ;ηs>=1, c1,c2,c3For unknown normal number;
The more new law of 3.2 design auto-adaptive parameters:
Wherein η1,η2,η3,η4,ε1,ε2,ε3,ε4For normal number;RespectivelyDerivative;ForTwo norms,ForTwo norms, | | Ω | | be Ω two norms;
Step 4, set time stability proves that process is as follows:
4.1 prove that all signals of rigid aircraft system are all uniform ultimate boundeds, and design liapunov function is such as
Lower form:
WhereinSTIt is the transposition of S;
Derivation is carried out to formula (18), is obtained:
Wherein k3min=min { k31,k32,k33, min { } indicates minimum
Value;For the derivative of S;δ1,δ2,δ3,δ4For normal number;
Then determine that all signals of rigid aircraft system are all uniform ultimate boundeds;
4.2 prove set time convergence, and design liapunov function is following form:
Derivation is carried out to formula (20), is obtained:
Wherein
γ2It is greater than zero upper dividing value for one;
Based on the above analysis, rigid aircraft system mode is in set time uniform ultimate bounded.
For the present invention in external interference, rotary inertia is uncertain, under the factor of actuator saturation and failure, with adaptive solid
Posture of fixing time is calmed method, realizes system stability contorting, guarantees that system mode realizes set time uniform ultimate bounded.This hair
Bright technical concept are as follows: for external disturbance is contained, rotary inertia is uncertain, the rigid aircraft system of actuator saturation and failure
System, devises nonsingular adaptive set time controller in conjunction with self adaptive control using sliding-mode control.It is nonsingular
The design of set time sliding-mode surface not only guarantees the set time convergence of system mode, but also solves singular value problem.In addition,
It is restrained based on designed adaptive updates, it is not necessary that total uncertain upper bound information is known in advance.The present invention exists extraneous in system
Under interference and the uncertain situation of rotary inertia, the control method of the set time uniform ultimate bounded of system mode is realized.
The invention has the benefit that designed set time sliding-mode surface effective solution singular value problem;It is being
There are external interferences for system, and rotary inertia is uncertain, in the case where actuator saturation and failure, realize the set time of system mode
Uniform ultimate bounded, and convergence time is unrelated with the original state of system.
Detailed description of the invention
Fig. 1 is rigid aircraft attitude quaternion schematic diagram of the invention;
Fig. 2 is rigid aircraft angular speed schematic diagram of the invention;
Fig. 3 is rigid aircraft sliding-mode surface schematic diagram of the invention;
Fig. 4 is rigid aircraft control moment schematic diagram of the invention;
Fig. 5 is rigid aircraft parameter Estimation schematic diagram of the invention, wherein (a) is parameter c1,c2,c3Estimation;(b)
For the estimation of parameter ξ;
Fig. 6 is control flow schematic diagram of the invention.
Specific embodiment
The present invention will be further described with reference to the accompanying drawing.
- Fig. 6 referring to Fig.1, a kind of adaptive set time posture of rigid aircraft considering actuator constraints problem are calm
Method the described method comprises the following steps:
Step 1, the kinematics and dynamics modeling of rigid aircraft system is established, system mode and control ginseng are initialized
Number, process are as follows:
The kinematical equation of 1.1 rigid aircraft systems are as follows:
Wherein qv=[q1,q2,q3]TAnd q4The respectively vector section and scalar component and satisfaction of unit quaternionq1,q2,q3Respectively it is mapped in rectangular coordinate system in space x, y, the value in z-axis;It is q respectivelyvAnd q4's
Derivative;For qvTransposition;Ω∈R3It is the angular speed of rigid aircraft;I3It is R3×3Unit matrix;It indicates are as follows:
The kinetics equation of 1.2 rigid aircraft systems are as follows:
Wherein J ∈ R3×3It is the rotator inertia matrix of rigid aircraft;It is the angular acceleration of rigid aircraft;u∈
R3With d ∈ R3It is control moment and external disturbance;D=diag (D1,D2,D3)∈R3×3It is 3 × 3 symmetrical diagonal actuator efficiency
Matrix meets 0 < Di(t)≤1, i=1,2,3;Sat (u)=[sat (u1),sat(u2),sat(u3)]TIt is generated for actuator
Practical control moment, sat (ui) it is the actuator with saturated characteristic, it is expressed as sat (ui)=sgn (ui)min{umi,|ui|,
umiFor the control moment that maximum provides, sgn (ui) it is sign function, min { umi,|ui| be both minimum value;In order to more square
Just expression control constraints, sat (u) are expressed as sat (u)=Θ (u) u, Θ (u)=diag (Θ1(u),Θ2(u),Θ3(u))
∈R3×3For 3 × 3 symmetrical diagonal matrix, Θi(u) it indicates are as follows:
Meet 0 < ξ≤min (DiΘi(u))≤1, min (DiΘiIt (u)) is minimum value, i=1,2,3, ξ be unknown normal
Number;Ω×It indicates are as follows:
1.3 rotator inertia matrix Js meet J=J0+ Δ J, wherein J0With Δ J respectively indicate J nominal section and uncertain portion
Point, then formula (4) is write as again:
Further obtain:
1.4 pairs of formulas (1) carry out differential, obtain:
Wherein ΩTFor the transposition of Ω;For qvSecond dervative;For J0It is inverse;It indicates are as follows:
Respectively q1,q2,q3Derivative;
Step 2, for external disturbance is had, rotary inertia is uncertain, the rigid aircraft system of actuator saturation and failure
System, the sliding-mode surface of design, process are as follows:
Select nonsingular set time sliding-mode surface are as follows:
Wherein, With sgn (qi) it is sign function, λ1> 0, λ2> 0, a2> 1, For qiLead
Number, i=1,2,3;
Step 3, nonsingular adaptive set time controller is designed, process is as follows:
3.1 design set time controllers are as follows:
Wherein S=[S1,S2,S3]T,Γ=diag (Γ1,Γ2,Γ3)∈
R3×3For 3 × 3 symmetrical diagonal matrix;K1=diag
(k11,k12,k13)∈R3×3For 3 × 3 symmetrical diagonal matrix, K2=diag (k21,k22,k23)∈R3×3It is symmetrical diagonal for 3 × 3
Matrix, K3=diag (k31,k32,k33)∈R3×3For 3 × 3 symmetrical diagonal matrix, k11,k12,k13,k21,k22,k23,k31,k32,
k33For normal number,Respectively c1,c2,c3, the estimation of ξ;ηs>=1, c1,c2,c3For unknown normal number;
The more new law of 3.2 design auto-adaptive parameters:
Wherein η1,η2,η3,η4,ε1,ε2,ε3,ε4For normal number;RespectivelyDerivative;For
Two norms,ForTwo norms, | | Ω | | be Ω two norms;
Step 4, set time stability proves that process is as follows:
4.1 prove that all signals of rigid aircraft system are all uniform ultimate boundeds, and design liapunov function is such as
Lower form:
WhereinSTIt is the transposition of S;
Derivation is carried out to formula (18), is obtained:
Wherein k3min=min { k31,k32,k33, min { } indicates minimum
Value;For the derivative of S;δ1,δ2,δ3,δ4For normal number;
Then determine that all signals of rigid aircraft system are all uniform ultimate boundeds;
4.2 prove set time convergence, and design liapunov function is following form:
Derivation is carried out to formula (20), is obtained:
Wherein
γ2It is greater than zero upper dividing value for one;
Based on the above analysis, rigid aircraft system mode is in set time uniform ultimate bounded.
For the validity for verifying proposed method, this method carries out simulating, verifying for rigid aircraft system.System is initial
It is as follows to change parameter setting:
The initial value of system: q (0)=[0.3, -0.2, -0.3,0.8832]T, Ω (0)=[1,0, -1]TRadian per second;Turn
The nominal section J of dynamic inertial matrix0=[40,1.2,0.9;1.2,17,1.4;0.9,1.4,15] kilogram * square metres, the moment of inertia
Uncertain portion's Δ J=diag [sin (0.1t), 2sin (0.2t), 3sin (0.3t)] of battle array;External disturbance d (t)=[0.2sin
(0.1t),0.3sin(0.2t),0.5sin(0.2t)]T* meters of ox;The parameter of sliding-mode surface is as follows: λ1=1, λ2=1, a1=1.5, a2
=1.5;The parameter of controller is as follows:K1=K2=K3=I3;More new law parameter is as follows: ηi=0.1, εi=
0.001, i=1,2,3,4, ηs=30,Maximum control moment umi
=25 Ns * meters, the selection of actuator efficiency value are as follows:
Wherein i=1,2,3.
The attitude quaternion of rigid aircraft and the response schematic diagram difference of angular speed are as depicted in figs. 1 and 2, it can be seen that
Attitude quaternion and angular speed can converge in zero domain of equalization point at 7 seconds or so;The sliding-mode surface of rigid aircraft is rung
Answer schematic diagram as shown in Figure 3, it can be seen that sliding-mode surface can converge in zero domain of equalization point at 5 seconds or so;Rigidity flight
The control moment of device is as shown in Figure 4, it can be seen that control moment clipping is in 25 Ns * meters;Parameter Estimation responds schematic diagram difference
As shown in Fig. 5 (a) and Fig. 5 (b).
Therefore, the present invention designs set time sliding-mode surface effective solution singular value problem;Exist in system extraneous
Interference, rotary inertia is uncertain, in the case where actuator saturation and failure, realizes that the set time of system mode unanimously finally has
Boundary, and convergence time is unrelated with the original state of system.
Described above is the excellent effect of optimization that one embodiment that the present invention provides is shown, it is clear that the present invention is not only
It is limited to above-described embodiment, without departing from essence spirit of the present invention and without departing from the premise of range involved by substantive content of the present invention
Under it can be made it is various deformation be implemented.
Claims (1)
- A kind of method 1. adaptive set time posture of rigid aircraft for considering actuator constraints problem is calmed, feature exist In: it the described method comprises the following steps:Step 1, the kinematics and dynamics modeling of rigid aircraft system is established, system mode and control parameter are initialized, Process is as follows:The kinematical equation of 1.1 rigid aircraft systems are as follows:Wherein qv=[q1,q2,q3]TAnd q4The respectively vector section and scalar component and satisfaction of unit quaternionq1,q2,q3Respectively it is mapped in rectangular coordinate system in space x, y, the value in z-axis;It is q respectivelyvAnd q4's Derivative;For qvTransposition;Ω∈R3It is the angular speed of rigid aircraft;I3It is R3×3Unit matrix;It indicates are as follows:The kinetics equation of 1.2 rigid aircraft systems are as follows:Wherein J ∈ R3×3It is the rotator inertia matrix of rigid aircraft;It is the angular acceleration of rigid aircraft;u∈R3And d ∈R3It is control moment and external disturbance;D=diag (D1,D2,D3)∈R3×3It is 3 × 3 symmetrical diagonal actuator efficiency matrix, Meet 0 < Di(t)≤1, i=1,2,3;Sat (u)=[sat (u1),sat(u2),sat(u3)]TThe practical control generated for actuator Torque processed, sat (ui) it is the actuator with saturated characteristic, it is expressed as sat (ui)=sgn (ui)min{umi,|ui|, umiFor most The control moment provided greatly, sgn (ui) it is sign function, min { umi,|ui| be both minimum value;For more easily table Show that control constraints, sat (u) are expressed as sat (u)=Θ (u) u, Θ (u)=diag (Θ1(u),Θ2(u),Θ3(u))∈R3×3For 3 × 3 symmetrical diagonal matrix, Θi(u) it indicates are as follows:Meet 0 < ξ≤min (DiΘi(u))≤1, min (DiΘiIt (u)) is minimum value, i=1,2,3, ξ be unknown normal number;Ω× It indicates are as follows:1.3 rotator inertia matrix Js meet J=J0+ Δ J, wherein J0With Δ J respectively indicate J nominal section and uncertain part, Then formula (4) is write as again:Further obtain:1.4 pairs of formulas (1) carry out differential, obtain:Wherein ΩTFor the transposition of Ω;For qvSecond dervative;For J0It is inverse;It indicates are as follows:Respectively q1,q2,q3Derivative;Step 2, for external disturbance is had, rotary inertia is uncertain, the rigid aircraft system of actuator saturation and failure, if Sliding-mode surface needed for meter, process are as follows:Select nonsingular set time sliding-mode surface are as follows:Wherein,With sgn (qi) it is sign function, λ1> 0, λ2> 0, a2> 1, For qiDerivative, i=1,2,3;Step 3, nonsingular adaptive set time controller is designed, process is as follows:3.1 design set time controllers are as follows:Wherein S=[S1,S2,S3]T,Γ=diag (Γ1,Γ2,Γ3)∈R3×3 For 3 × 3 symmetrical diagonal matrix;0 < r1< 1, r2> 1, K1=diag (k11, k12,k13)∈R3×3For 3 × 3 symmetrical diagonal matrix, K2=diag (k21,k22,k23)∈R3×3For 3 × 3 symmetrically to angular moment Battle array, K3=diag (k31,k32,k33)∈R3×3For 3 × 3 symmetrical diagonal matrix, k11,k12,k13,k21,k22,k23,k31,k32,k33 For normal number,Respectively c1,c2,c3, the estimation of ξ;ηs>=1, c1,c2,c3For unknown normal number;The more new law of 3.2 design auto-adaptive parameters:Wherein η1,η2,η3,η4,ε1,ε2,ε3,ε4For normal number;RespectivelyDerivative;ForTwo Norm,ForTwo norms, | | Ω | | be Ω two norms;Step 4, set time stability proves that process is as follows:4.1 prove that all signals of rigid aircraft system are all uniform ultimate boundeds, and design liapunov function is following shape Formula:WhereinSTIt is the transposition of S;Derivation is carried out to formula (18), is obtained:Wherein k3min=min { k31,k32,k33, min { } indicates minimum Value;For the derivative of S;δ1,δ2,δ3,δ4For normal number;Then determine that all signals of rigid aircraft system are all uniform ultimate boundeds;4.2 prove set time convergence, and design liapunov function is following form:Derivation is carried out to formula (20), is obtained:Wherein γ2It is greater than zero upper dividing value for one;Based on the above analysis, rigid aircraft system mode is in set time uniform ultimate bounded.
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CN110244747A (en) * | 2019-08-02 | 2019-09-17 | 大连海事大学 | Heterogeneous fleet fault-tolerant control method based on actuator fault and saturation |
CN112180960A (en) * | 2020-09-29 | 2021-01-05 | 西北工业大学 | Unmanned aerial vehicle fault-tolerant flight method and flight system for actuator faults |
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KR101434310B1 (en) * | 2013-05-22 | 2014-08-26 | 현대로템 주식회사 | Stabilization enhancement method of drive unit mounted on moving equipment and system, that moving equipment |
CN105843240B (en) * | 2016-04-08 | 2019-01-22 | 北京航空航天大学 | A kind of spacecraft attitude Integral Sliding Mode fault tolerant control method considering actuator failures |
CN106406086B (en) * | 2016-05-26 | 2019-05-07 | 北京航空航天大学 | A kind of flexible spacecraft interference compensation method based on sliding formwork interference observer |
CN109564406B (en) * | 2016-08-03 | 2021-06-15 | 孟强 | Self-adaptive terminal sliding mode control method |
CN106774373B (en) * | 2017-01-12 | 2019-11-05 | 哈尔滨工业大学 | A kind of quadrotor drone finite time Attitude tracking control method |
CN106886149B (en) * | 2017-02-23 | 2019-10-22 | 哈尔滨工业大学 | A kind of spacecraft robust finite time saturation Attitude tracking control method |
CN107450584B (en) * | 2017-08-29 | 2020-06-30 | 浙江工业大学 | Aircraft self-adaptive attitude control method based on fixed time sliding mode |
CN107703952B (en) * | 2017-08-29 | 2020-10-30 | 浙江工业大学 | Nonsingular fixed time self-adaptive attitude control method for rigid aircraft |
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CN110244747A (en) * | 2019-08-02 | 2019-09-17 | 大连海事大学 | Heterogeneous fleet fault-tolerant control method based on actuator fault and saturation |
CN112180960A (en) * | 2020-09-29 | 2021-01-05 | 西北工业大学 | Unmanned aerial vehicle fault-tolerant flight method and flight system for actuator faults |
CN112180960B (en) * | 2020-09-29 | 2021-09-14 | 西北工业大学 | Unmanned aerial vehicle fault-tolerant flight method and flight system for actuator faults |
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