This paper presents an approach of inverse damage detection and localization based on model reduction. The problem is formulated as where optimization algorithm used to minimize the cost function expressed normalized difference between a frequency vector tested structure its numerical model. A finite element bi-dimensional monolithic composite beam reinforced by graphite-epoxy define in which different scenarios are considered stiffness Then, calculations made reduced built technique proper...

This paper presents a new damage detection and localization technique based on the changes in vibration parameters using BAT Particle Swarm Optimization algorithm. The finite element method is used to apply at specific element(s) of considered beams. represented by reduction Young's modulus identification formulated as an optimization problem objective function Modal Scale Factor natural frequencies. A procedure for detecting locating beam-like structures algorithm used. approach that can be...

The detection techniques based on non-destructive testing (NDT) defects are preferable because of their low cost and operational aspects related to the use analyzed structure. In this study, we used genetic algorithm (GA) for detecting locating damage. finite element was diagnostic beams. Different structures considered may incur damage be modelled by a loss rigidity supposed represent defect in structure element. Identification is formulated as an optimization problem using three objective...

An important proportion of the cost machined mechanical elements emanates from cutting tools inserts. A large part these costs is due to improper maintenance decisions. In this paper, we demonstrate use a gamma process tool wear simulation for providing lifetimes at several speeds. We show survival model (Cox Proportional Hazards model) on turning inserts, using speed as covariate. Contrary other approaches, not used produce parameters reliability model, but Mean Up Time rather computed...

Different approaches on the detection of damages based dynamic measurement structures have appeared in last decades. They were based, amongst others, changes natural frequencies, modal curvatures, strain energy or flexibility. Wavelet analysis has also been used to detect abnormalities shapes induced by damages. However majority previous work was made with non-corrupted noise signals. Moreover, damage influence for each mode shape studied separately. This paper proposes a new methodology...

Structural defect detection based on finite element model (FEM) updating is an optimization problem by minimizing the discrepancy of responses between and measurement. Researchers have introduced many methods to perform FEM for structures. A popular approach adopt particle swarm (PSO) algorithm. In this process, fitness function a critical factor in success PSO‐FEM approach. Our objective compare performances four functions natural frequencies using standard detection. paper, definition PSO...

In the pioneer CAE stage, life assessment is essential part to make product meet requirement. Commonly, lives of flexible structures are determined by vibration fatigue which accrues at or close their natural frequencies. However, existing PSD damage estimation methods have two prerequisites for use: behavior mechanical system must be linear and probability density function response stresses follow a Gaussian distribution. Under operating conditions, non-Gaussian signals often recorded as...

This study focused on numerical analysis of the parameters influencing oil mist flow (MQL) outside a rotating tool, in non-contact configuration. approach was mandatory step for parameter optimizations before taking into account material removing. The optimization inner canalization geometries to milling tool performed transfer mist. Reynolds Average Navier Stokes (RANS) and Lagrangian equations were used simulate inside canalizations by integrating standard k-ε turbulence model with STAR...

This paper presents an experimental evaluation of cutting tool wear based on vibration signals to study the development insert in order increase machining performance.To achieve this purpose, life tests according ISO standard 3685 have been performed turning operation under dry conditions.The was studied for thirty inserts selected from same production batch, and used strictly identical conditions a statistical study.The signatures acquired during processes analysed contrasted using three...

The machining industry raises an ever-growing concern for the significant cost of cutting tools in production process mechanical parts, with a focus on replacement policy these inserts. While early maintenance induces lower tool return investment, scraps and inherent costs stem from late replacement. framework this paper is attempt to predict inserts Mean Up Time, based solely value parameter (the speed particular turning application). More specifically, use Cox Proportional Hazards (PH)...

Health surveillance in industries is an important prospect to ensure safety and prevent sudden collapses. Vibration Based Structure Monitoring (VBSHM) being used continuously for structures machine diagnostics industry. Changes natural frequencies are frequently as input parameter VBSHM. In this paper, the frequency shift coefficient (FSC) assessment of various numerical damaged cases. An FSC-based algorithm employed order estimate positions severity damages using only healthy unknown...

Optimal conditions for milling carbon/epoxy composite material were established by response surface methodology. The combination of cutting parameters such as speed (Vc) and chip thickness (h) was set at various design points a central design. Significant regression models describing the changes vibration level, delamination composite, force, workpiece temperature developed with coefficient determination greater than 0.90. Results suggested that beyond threshold vibration, occurrence is...

In the past few decades, vibration-based structural damage detection (SDD) has attracted widespread attention. Using response data of engineering structures, researchers have developed many methods for localization and quantification. Adopting meta-heuristic algorithms, in which particle swarm optimization (PSO) is most widely used, a popular approach. Various PSO variants also been proposed improving its performance SDD, they are generally based on Global topology. However, addition to...