Based on an appropriate uncertainty description, a new robust reliability method for stability issue of dynamic systems is developed to deal with bounded uncertainties. The presented methods provide necessary and sufficient conditions quadratic stabilization uncertain are suitable both cases where the bounds parameters known they unknown. Using this method, measure parametric can be provided, maximum robustness such that system stable obtained. design controller stabilizing carried out by...

Active vibration control of uncertain structures is an attractive issue and essentially a complicated multidisciplinary problem. In this research, the author focuses on dealing with parametric uncertainties actively controlled dynamic systems from viewpoint reliability. An efficient non-probabilistic robust reliability methodology for mixed H 2 /H ∞ presented systematically by describing parameters as interval variables. The static output controller design carried out solving...

This paper studied the influence of high and low combined fatigue (CCF) on compressor blade performance. We investigated coupling between cycle (LCF) loading from centrifugal force with (HCF) vibration determined disc frequency using static analysis at maximum rotational speed. designed constructed a test rig, CCF tests were performed TC6 to analyze life characteristics. Results showed that could significantly shorten compared pure LCF larger HCF caused more significant reduction. Fatigue...

Achieving balance between robustness and performance is always a fundamental challenge we are faced with in control design of systems the presence uncertainties. H ∞ robust theory has been extensively used to deal problems stabilization disturbance attenuation uncertain systems. However, traditional control, most frequently method for dealing uncertainties adopting assumption norm-bounded perturbations arbitrary structure about nominal plant techniques based on deterministic worst-case...

Summary An efficient robust reliability method for non‐fragile control design of dynamic system with bounded parametric uncertainties is presented systematically, in which the existing controlled plant and controller realization are taken into account simultaneously an integrated framework. Reliability‐based optimization uncertain systems carried out by optimizing H 2 ∞ performances closed‐loop system, constraints on reliabilities. The obtained may possess a coordinated optimum performance...

An efficient nonprobabilistic robust reliability method for H∞ controller design of parametric uncertain systems is presented by describing the parameters as interval variables. Design optimization carried out solving a based problem, which disturbance attenuation, control cost, and can be taken into account simultaneously. By method, measure an system satisfying required performance obtained, robustness bounds such that cost guaranteed provided. The formulations are in framework linear...

Considering that uncertainty is inherent and unavoidable in engineering practice the available information about uncertain parameters always not sufficient, paper tries to carry out nonprobabilistic vibration reliability analysis so as avoid resonance on structure with bounded parameters. The input uncertain-but-bounded are treated interval variables, an model adopted describe uncertainties. Then a theory of introduced, which dimensionless index system defined. In order investigate failure...

Structural reliability theory stems from the nature of randomness, fuzziness, characteristic and some other uncertainties in process engineering structural design, construction employment. With rapid development science technology industry, many departments have realized importance problem its potential economic benefits. Solving has quickly become an important issue field academic research. Because complexity structure harsh working environment which lead to a complex problem, traditional...

By using an appropriate uncertainty description, a new robust reliability method is presented in the paper for performance analysis and design optimization of guaranteed cost controller linear parametric uncertain systems. method, measure controlled system satisfying required can be obtained, robustness bounds parameters provided. The optimal control carried out by based optimization, which makes it possible to make strategies that take both with respect uncertainties into account...

This paper investigates steel alloy stator blade flexural vibration characteristics and fatigue properties analytically using tests. First, life data reliability is analyzed theoretical strain endurance limit ΔεC deficiencies are assessed. A model from the literature used to predict test for four alloys derive an extended estimation expression limit. The proposed three-parameter models can be applied estimate in practical working environments.

In the reliability assessment of structures, a situation we frequently encounter is that by means available information some parameters involved can be depicted accurately their probability distributions and others only described bounds or ranges variations. So, it meaningful to construct model which probabilistic nonprobabilistic uncertainties treated reasonably in an integrated framework. The main purpose this paper establish strictly mathematical foundation unified framework for...

Uncertainty of the parameters in control system was described by interval variables, and some idea nonprobabilistic reliability method that we proposed previous papers used for robust performance analysis synthesis uncertain systems. A new method, called presented H/sub /spl infin// feedback controller design linear systems with parameters. By measure an satisfying a specified can be obtained, robustness bounds provided. The optimal strategies were derived minimizing disturbance attenuation...