# Absolute stability of nonlinear control systems by Xiao-Xin Liao

By Xiao-Xin Liao

Following the hot advancements within the box of absolute balance, Professor Xiaoxin Liao, along side Professor Pei Yu, has created a moment variation of his seminal paintings at the topic. Liao starts with an advent to the Lurie challenge and the Lurie keep an eye on approach, prior to relocating directly to the easy algebraic enough stipulations for absolutely the balance of self sustaining and non-autonomous ODE structures, in addition to numerous designated sessions of Lurie-type structures. the focal point of the booklet then shifts towards the recent effects and study that experience seemed within the decade because the first variation used to be released. This contains nonlinear keep watch over structures with a number of controls, period keep an eye on structures, time-delay and impartial Lurie keep watch over platforms, structures defined via sensible differential equations, absolutely the balance for neural networks, in addition to purposes to chaos regulate and chaos synchronization.

This booklet is geared toward undergraduates and academics within the components of utilized arithmetic, nonlinear keep an eye on structures and chaos regulate and synchronisation, yet can also be precious as a reference paintings for researchers and engineers. The booklet is self-contained, although a simple wisdom of calculus, linear method and matrix concept, and traditional differential equations is needed to realize an entire knowing of the workings and methodologies mentioned inside of.

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**Extra info for Absolute stability of nonlinear control systems**

**Example text**

There exist constants ci > 0 (i = 1, 2, . . , m), c j ≥ 0 ( j = m + 1, . . , n), ε > 0 such that ε Im×m 0 B(bi j )n×n + 0 0 n×n is negative semi-deﬁnite, where ⎧ i = j = 1, 2, . . , m; ⎨ − ci |aii |, bi j = 1 ⎩ − (ci ai j + c j a ji ), i = j, i, j = 1, 2, . . , n. t. the partial variable y. Proof. t. the partial variable y: n V (x) = ∑ ci i=1 xi 0 fi (xi ) dxi . 31, and is thus omitted. 36. 18) satisfy the following conditions: 1. fi (xi ) xi < 0 for xi = 0 aii > 0, i = m + 1, m + 2, . . , n, and fi (xi )xi ≤ 0, aii ≥ 0, i = 1, 2, .

3. 2) is negative deﬁnite. 2) is absolutely stable. 3 is correct, which was the earliest original method used to study the absolute stability of Lurie controls systems. 5). ) (x, f (σ )) , and hoped to ﬁnd the condition of (x, f (σ )) satisfying Sylvester condition to overcome the difﬁculty. However, this failed. 2) to obtain x˙ = A x + b f (σ ), σ˙ = cT A x + cTb f (σ ). 6) We only need to consider a special case by choosing f (σ ) = σ from which the failure can be seen immediately. 6) becomes x˙ = A x + b σ , σ˙ = cT A x + cT b σ .

N, ⎪ ⎪ ⎪ ⎪ ⎩ ±∞ 0 Fii (xi ) dxi |Fii (xi )| ≤ | fii (t, xi )|, 3. The matrix A(ai j (t, x))n×n + 0<ε i = 1, 2, . . , m, = +∞, i = 1, 2, . . , n; ε Im×m 0 0 0 is negative semi-deﬁnite, where n×n 1, and ⎧ −1, i = j = 1, 2, . . , n, ⎪ ⎪ ⎪ ⎨ 1 fi j (t, x j ) f ji (t, xi ) ai j (t, x) = + , xi x j = 0, i, j = 1, 2, . . , n, ⎪ 2 Fj j (x j ) Fii (xi ) ⎪ ⎪ ⎩ 0, xi x j = 0, i, j = 1, 2, . . , n. t. the partial variable y. Proof. t. y: n V (x) = ∑ i=1 0 xi Fii (xi ) dxi . 34 2 Principal Theorems on Global Stability Then m xi V (x) ≥ ∑ i=1 0 Fii (xi ) dxi := ϕ (y).