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On a program manifold’s stability of one contour automatic control systems

  • S. S. Zumatov EMAIL logo
Published/Copyright: December 29, 2017
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Open Engineering
From the journal Open Engineering Volume 7 Issue 1

Abstract

Methodology of analysis of stability is expounded to the one contour systems automatic control feedback in the presence of non-linearities. The methodology is based on the use of the simplest mathematical models of the nonlinear controllable systems. Stability of program manifolds of one contour automatic control systems is investigated. The sufficient conditions of program manifold’s absolute stability of one contour automatic control systems are obtained. The Hurwitz’s angle of absolute stability was determined. The sufficient conditions of program manifold’s absolute stability of control systems by the course of plane in the mode of autopilot are obtained by means Lyapunov’s second method.

Keywords: absolute stability; one contour systems; automatic control; program manifold; Lyapunov function

1 Introduction

The problem of construction of all set of the systems of differential equations represented by an integral curve, as well as problems of construction of systems of differential equations in different aspects were considered by N.P. Erugin, A.S. Galiullin, I.A. Mukhametzyanov, R.G. Mukharlyamov and others. It should be noted that in the process of solution of these problems, being one of basic problems of theory of stability, the problems of construction of the steady systems on a given program manifold grew into an independent theory. A great number of works is devoted to the construction of systems of equations on the given program manifold, possessing properties of stability, optimality and establishment of estimations of indexes’ quality of transient in the neighborhood of a program manifold and to solving of various inverse problems of dynamics (see [1, 11]). The detailed reviews of these works are shown in [2, 4, 9, 11]. The large number of the nonlinear systems of automatic control can be presented as one contour system consisting of two parts: linear part and nonlinear element [12]. The analysis of such systems shows that at the nonlinear elements of certain kind, transients in them can be similar, that allows to generalize the results of private experiment.

The given program Ω (t) is exactly realized only if the initial values of the state vector satisfy the condition ω(t0, x0) = 0. However, this condition cannot always be exactly satisfied. Therefore, in the construction of systems of program motion, the requirement of the stability of the program manifold Ω (t) with respect to the vector function ω should also be taken into account.

The study of these problems is due to the existence of a number of the inverse dynamics problems.

In this paper we study the problem of stability of one contour automatic control system in the neighborhood of a program manifold.

Let the differential equation

η˙=−Qη,(1)

where η is n -dimension vector, Q (n × n) is some matrix, possesses by a (n − s)-dimension smooth manifold Ω (t), with given the vector equation

ω(t,x)=0,(2)

where ω is s ≤ n dimension vector.

On the basis of the criterion that Ω (t) is integral for the system (1), we have

ω˙=∂ω∂t+∂ω∂ηη˙=F(t,η,ω).(3)

The purpose is the construction of one contour systems on the given manifold.

We will notice that at the construction of the systems, except a condition (3), one of the basic requirements is the conditions of stability of the manifold Ω (t) in relation to some given function. The given program Ω (t) is exactly realized only if the initial values of the state vector satisfy the condition ω(t, x) = 0. However, this condition cannot always be exactly satisfied. Therefore, in the construction of systems of program motion, the requirement of the stability of the program manifold Ω (t) with respect to the vector function ω should also be taken into account.

Together with equation (1), we will consider the system of kind

η˙=−Qη−kf(σ),σ˙=lTPTω−ρn+1σ,(4)

where η, k and l are n-dimensions vector -columns:

ηT=∥η1,…,ηn∥,σ=ηn+1;kT=∥α1,0,…,0∥;

and P (s × n), Q (n × n) are constant matrices:

Q=ρ100…00−α2ρ20…000−α3ρ3…00⋅⋅⋅⋅⋅⋅000…−αnρn(5)

Nonlinear characteristic f (σ) is continuous on σ and satisfies the conditions

f(0)=0;k1σ2≤f(σ)σ≤k2σ2∀σ≠0.(6)

where k1 and k2 are positive constants.

We will notice that a function f (σ) is essentially a control function on deviation from the program and at ω = σ = 0, and by virtue of conditions (6), the system (4) takes the form of (1). Consequently Ω (t) is integral for the system (4) also.

If

xi=ηi,σ=xn+1,ρi=Ti−1>0∧αi=γiTi−1=γiρi>0∀i1n+1,(7)

then we will get one contour system consisting of n + 1 aperiodic links, closed by a nonlinear feedback connection. Aperiodic links can serve engines of different types (electric, hydraulic, pneumatic etc.), electric generator of direct-current, reservoir with gas etc. [13]. Usually processes in such system are described by equations [14]:

(T1p+1)x1=−γ1f(xn),(Tip+1)xi=γixi−1,∀i2n+1,(8)

where ρ=ddt;

Ti, γi are positive constants:

Ti>0∧γi>0∀i1n+1.(9)

We will suppose that F = -Aω, (-A (s×s)) is Hurwitz matrix, then differentiating a manifold (2), by virtue of the system (4), we will get

ω˙=−Aω−∂ω∂ηkσ,(10)
σ˙=lTPTω−ρn+1σ.

Definition 1

A program manifold Ω (t) is called absolutely stable with respect to a vector-function ω, if it is asymptotically stable on the whole on the solutions of the system (10) at any ω (t0, η0) and function f (σ) satisfying conditions (6).

We will consider the linearized system

ω˙=−Aω−bhσ,lT=∥0,…,0,αn+1∥,σ˙=cTω−ρn+1σ,(11)

which is derived from (10)f (σ) = hσ, b=∂ω∂ηk,

c = Pl. We will suppose that it is asymptotically stable at∀ h:

k1−ε≤h≤k2+ε,(12)

where ɛ is how pleasingly small positive constant.

Asked, whether a program manifold Ω (t) of the system (10) will be asymptotically stable on the whole with respect to a vector-function ω for any function ∀f (σ) ϵc[k1,k2].

2 Necessary conditions of stability and determination of Hurwitz’s angle

Theorem 1

For absolute stability of program manifold Ω (t) of the system (10) with respect to a vector-function ω in Hurwitz’s angle [k1, k2], it is necessary that the system (1) was asymptotically stable at the condition (12)

Characteristic equation of the system (11) looks like

Δ(h,λ)=Q+λEhbcTρn+1+λ=∑m=0s+1as(h)λs+1−m=0.(13)

We compose the Hurwitz matrix by means of coefficients of characteristic equation

Γm(h)==a1(h)10…00a3(h)a2(h)a1(h)…00⋅⋅⋅⋅⋅⋅……am−1(h)am−1(h)…0am(h),∀m1s+1(14)

We will introduce the following denotations:

ξm=infξm(h)∀m1s+1,(15)
ξm(h)=detΓm(h)∀m1s+1,(16)

then, by virtue of the Hurwitz theorem for asymptotic stability of program manifold Ω (t) with respect to a vector-function ω on the whole it is necessary the inequality

ξm>0∀m1s+1.(17)

Thus a Hurwitz’s angle is determined as crossing on a line

[k1−ε,k2+ε]=⋂m=1s+1ξs(h)>0∀h.(18)

Thus, for determination of a Hurwitz’s angle it is necessary calculations of polynomials ξm (h).

3 Algorithm of calculation of coefficients am (h)

We will define

det∥Q+λE∥=∑τ=0n−1qτλn−1−τ(q0=1);(19)
det∥Q+λE∥(ρn+λ)=∑s=0namλn−m(a0=1);(20)
Q(λ)=∑γ=0n−2Qmλn−2−γ,(21)

where Q (λ) is the added matrix for ‖ Q + λE‖, coefficients qm and am are determined as:

q1=∑i=1n−1ρi;q2=ρ1ρ2+⋯+ρn−2ρn−1;…;qn−1=∏i=1n−1ρi;a1=∑i=1n−1ρi;a2=ρ1ρ2+⋯+ρn−1ρn;…;an=∏i=1nρi=T−1,T=∏i=1nTi.

and a multiplier Δ (h, λ) from (13) we will transform to the kind

Δ(h,λ)=|Q+λE|[(ρn+λ)+hlT(Q+λE)m−1]==|Q+λE|(ρn+λ)+hlTQ(λ)b.(22)

By definition of the revers matrix, we have

∥Q+λE∥Q(λ)=Δ(h,λ)E,(23)

where E is unit matrix of dimension (n - 1) x (n - 1).

On the basis of formulas (20) - (22) from (23) after equating the coefficients at identical degrees λ, we will get a recurrent formula for determination of matrix- coefficients:

Qm=−QQm−2+qmE∀m1n−2(Q−1=0;Q0=E),(24)

what is more

QQn−2=qn−2E.(25)

On the basis of (13), (22) and (23) we will determine all the coefficients of the polynomial Δ (h, λ):

am(h)=am+hdm∀m1n,(26)
ds=lTQs−2(Q−2=Q−1=0;Q0=E).(27)

Thus, a Hurwitz’s angle (18) is determined by virtue of correlations (14) - (16) and (26). From (4) and (5) we will get the simplified expression:

lTQ(λ)b=∥0,…,0,αn∥×∥Qij∥×∥α1,0,…,0∥T=∏i=1nαi.(28)

Consequently, we have

d1=d2=…=dn−1=0;dn=∏i=1nαi=γ/T>0;(29)
γ=∏i=1nγi>0∧T>0.(30)

From (26) taking into account inequalities (9)(29), and (30) we obtained

as(h)=as>0∀s1n−1;an(h)=an+h⋅γ/T=T−1(1+hγ)>0.(31)

As it is seen from inequalities (31), the necessary coefficient conditions of absolute stability are performed, if constants to time Ti and γi are positive. It remains only to require the inequality (17) by virtue of correlations (31).

4 Algebraic criterion of stability

For the system (10), we build the Lyapunov function of the form

V=ωTLω+β∫0σf(σ)dσ,(32)

where L = LT > 0; β is parameter, and we find

−V˙=ωTCω+2ωTgf+βρn+1σf,(33)

where C is symmetrical three diagonal matrix

C=ATL+LA,g=Lb−(β/2)cT(34)

Supposing h (σ) = f (σ) /σ from (33), we get

−V˙>0,−V˙=ωTCω+2ωTgh(σ)+βρn+1h(σ)σ2.(35)

For that -V̇ > 0, it is necessary and sufficiently performing of a generalized Silvester’s inequality:

G[h(σ)]=Cgh(σ)gTh(σ)βρn+1(σ)≥ε>0,(36)

where ɛ is a small enough positive number. As is generally known, if -A is a Hurwitz’s matrix, then C > 0, consequently, for performing of condition (36), it is enough to require that the inequality

βρn+1−hgTC−1g≥ε(37)

subject to condition h (σ) > ɛ. We will set a matrix C = ∥cij∥1m>0 so that hold next correlations:

det∥cij∥1m∀m1s.(38)

Then sufficient conditions of absolute stability C > 0 is equivalent to the necessary conditions (17).

We will define now, that

inf(βρn+1−hgTC−1g)=gs.(39)

Thus, if correlation L = LT > 0 ∧ β > 0, is hold subject to condition (38), (39), then on the basis of Zubov's method of the seeming linearizing is valid

Theorem 2

If –Q is a Hurwitz’s matrix and there exists L = LT > 0 ∧ β > 0, so that the equality (39) hold, then absolute stability of program manifold (2) of system (10) with respect to vector-function ω in angle (18) follows from asymptotical stability of the system (11) in the same angle.

A parameter β is determined from a condition (39). Putting the value of g in (39), we get a quadratic equation in relation to this parameter

τ1β2−2τ2β+τ3≠0,(40)

where

τ1=h4(cTC−1c)>0;τ2=12(LcTC−1b+ρn+1).(41)

For existing of β > 0, it is necessary and sufficiently performing of inequality

τ2>0∧τ22−τ1τ3>0.(42)

We suppose, that L = diag ‖L1,…, Ls‖ > 0,

A=ρ100…00−α2ρ20…000−α3ρ3…00⋅⋅⋅⋅⋅⋅000…−αsρs,(43)

then we have

C=ATL+LA=c11−c210…00−c21c22−c32…000−c32c33…00⋅⋅⋅⋅⋅⋅000…cs−1,s−1−cs,s−1000…−cs,s−1cs,s.

Here

cii=2ρiLi;cij=αiLj.(44)

We put

c11=2ρ1L1;|cij|12=g1−α2L1−α2L12ρL2=g2;
|cij|13=g1−α2L10−α2L12ρL2−α3L20−α3L22ρ3L3=g3;…;|cij|1s=gs.(45)

From here, a recurrent formula is easily set for the coefficients of the matrix L:

Li=(gi+gi−2αi2Li−12)/2ρigi−1∀i1s(g−1=0;g0=1),(46)

where gi determine by the formula (45).

We calculate a vector g from (34) taking into account (45). We have

gT=∥α1H1,0,…,0,−αnβHn−12−1∥.(47)

Theorem 3

Let a function (32), L is diagonal, and a matrix A has a structure (43) and condition (42) is valid. Then a matrix C is determined from (44), (45)and the program manifold (2) of system (10) is absolute stable with respect to vector-function ω in angle (18).

5 Program manifold’s absolute stability of control systems by the course of plane

We will consider now the equations of motion of control system the course of plane in the mode of autopilot [15]:

T2ψ¨+Uψ˙+kψ=0;μ˙=fT(σ)σ=aω+Eω˙+G2ω¨−l−1μ,(48)

that possessing by smooth manifold Ω (t), given by equation

ω(τ,ψ)=0.(49)

Here constant T2 characterizes the inertness of regulating object, U is the natural damping, k characterizes the action of restorative force, a, E, G2, l are constants of regulator.

Statement of the problem: to determine the condition of stability for the program manifold (49).

Differentiating a program manifold (49) on τ, by virtue of the system (48) we get

ω¨=∂2ω∂τ2+2∂2ω∂τ∂ψψ˙+∂2ω∂ψ2ψ˙2+∂ω∂ψ˙−UT2ψ˙−μT2.(50)

We suppose, that [7]

∂2ω∂τ2+2∂2ω∂τ∂ψψ˙+∂2ω∂ψ2ψ˙2+∂ω∂ψ−UT2ψ˙−kT2ψF(τ,ψ,ω,ω˙),F(τ,ψ,ω,ω˙)=−α1ω˙−α2ω.(51)

Then we have

ω¨+α1ω˙+α2ω+∂ω∂ψμT2=0μ˙=fT(σ)σ=aω+Eω˙+G2ω¨−l−1μ(52)

Let ∂ω∂ψ=h is const. Introducing denotations

ω=η1;ω˙=rη2;μ=iξ,t=τr,r=ii=lT2T2+lG22h;φ(σ)=α2r;a2=−α2rp1=a−α2G2;p2=(E−α1G2)r.(53)

we reduce the system (52) to the normalized form in dimensionless variables

η˙=−Aη−δξξ˙=φ(σ)σ=pTη−ξ,(54)

where

η=∥η1η2∥;A=∥0−1a2a1∥;δ=∥01∥;p=∥p1p2∥;φ(σ)∈C(o,k).

We transform the system (52) by means of substitute z1 = ɳ2, z2 = -a2ɳ1 - ɳ2 -ξ, to the form

z˙=−Az−δφ(σ)ξ˙=φ(σ)σ=CTz−γζ.(55)

Here

CT=∥−P1a1a2+p2,p1a2∥;γ=1+p1a2.

A matrix L determine as the following [4]:

l1=c2+c1a12a2+c2a1+c12a1;l2=c12a2;l3=c22a1+c12a1a2

Theorem 4

Let (-A) be a Hurwitz’s matrix.

Then for absolute stability of program manifold (49) of the system (48) it is sufficiently performing of the following conditions

γ>0∧c>0,c2a1+c1a1a2+p1a2=0∧c1a2−p1a1a2+p2=0.

Theorem 5

For absolute stability of program manifold (49) of the system (48) on the angle (0, k] it is sufficiently performing of the following inequality

π(μ,q)=k−1+γq+cT(A2+μE)−1(A+qμE)δ>0∀μ≥0.

6 Conclusion

The conditions of stability of the one contour automatic control systems are obtained in the neighborhood of program manifold by means of construction of Lyapunov function. These results may be use for construction of stable one contour automatic control systems with respect to zero positions of equilibrium and will be developed for one contour systems with nonlinearity on type backlash, by the zone of insensitivity, satiation.

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Received: 2017-8-10
Accepted: 2017-11-14
Published Online: 2017-12-29

© 2017 S. S. Zumatov

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

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https://doi.org/10.1515/eng-2017-0051
Keywords for this article
absolute stability; one contour systems; automatic control; program manifold; Lyapunov function
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