Fault estimation method for a class of event-triggered transmission time-varying systems based on unknown input observer technology

An event-triggered, unknown input technology, applied in general control systems, control/regulation systems, test/monitoring control systems, etc., can solve problems such as the impact cannot be completely eliminated

Active Publication Date: 2018-06-26
SHANDONG UNIV OF SCI & TECH
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  • Abstract
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  • Application Information

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Problems solved by technology

However, the problems caused by its time-varying nature and the influence of the unknown input hidden in the difference between t

Method used

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  • Fault estimation method for a class of event-triggered transmission time-varying systems based on unknown input observer technology
  • Fault estimation method for a class of event-triggered transmission time-varying systems based on unknown input observer technology
  • Fault estimation method for a class of event-triggered transmission time-varying systems based on unknown input observer technology

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Embodiment 1

[0102] Such as figure 2 As shown, this embodiment is based on the verification of the three-capacity water tank DTS200 experimental equipment in the laboratory. For the three-capacity water tank system, the following system parameters are considered:

[0103]

[0104]

[0105]

[0106] Such as figure 1 As shown, tank 1 and tank 2 of the three-capacity water tank system will be directly affected by the water inlet valve and severe liquid level disturbance, we set d k =sin(k / 10)×10 -5 and D k =[1 0 0] T ;Set closed-loop control in

[0107]

[0108] initial condition X 0 and noise w k , v k are mutually independent Gaussian distribution sequences with variances of 10 -12 I.

[0109] For each possible failure f i，k (i=1,...,n f ), when the i-th fault occurs (f 0，k = 0 means no fault), the specific form of the system is as follows

[0110]

[0111] in,

[0112] This embodiment considers the following leakage faults:

[0113]

[0114] And only c...

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Abstract

The invention discloses a fault estimation method for a class of event-triggered transmission time-varying systems based on an unknown input observer technology. The method comprises establishing a system state space model, and introducing an event trigger signal transmission strategy therein; respectively augmenting an original system state and each possible fault into new state signals, designing filter parameters, recursively solving the least upper bound of an error covariance and minimizing the least upper bound, and calculating the filter gain; utilizing a filter residue corresponding tothe normal situation and a reasonably set threshold to perform fault detection; utilizing a residual matching method to implement fault separation, and taking a fault corresponding component in the corresponding filtered estimation value as a fault estimation value.

Description

technical field [0001] The invention relates to the field of fault diagnosis, in particular to a fault estimation method for solving a class of time-varying systems with event-triggered signal transmission based on unknown input observer technology. Background technique [0002] With the rapid development of science and technology, modern engineering systems are becoming more and more complex and expensive. Once the system fails, it will not only cause economic losses and casualties, but even lead to catastrophic consequences. This requires the system to have higher security and reliability. It goes without saying that fault diagnosis technology is playing an increasingly important role in industrial production, and many researches and production practices have proved that fault diagnosis technology has important practical significance. [0003] In practical applications, due to many unavoidable factors, the existence of unknown inputs in the system is very common. Once th...

Claims

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Application Information

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IPC IPC(8): G05B23/02
CPCG05B23/0243G05B2219/24065
Inventor 周东华刘洋卢晓钟麦英王建东
Owner SHANDONG UNIV OF SCI & TECH
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