Mechanical vibrations are severe phenomena of the physical world. These oscillations may become undesirable and cause temporary even irreversible damage to system. There several techniques minimizing these vibration effects ranging from passive methods use controllers with smart materials. In this sense, study aims analyze a control system installed in structure that simulates two‐floor buildings. This based on incorporation one SMA‐SE ( Superelastic Shape Memory Alloys ) coil springs...

The classic monitoring methods for detecting faults in automotive vehicles based on on-board diagnostics (OBD) are insufficient when diagnosing several mechanical failures. Other sensing techniques present drawbacks such as high invasiveness and limited physical range. work presents a fully noninvasive system fault detection isolation internal combustion engines through sound signals processing. An acquisition was developed, whose data transmitted to smartphone which the signal is processed,...

The digital era has brought a number of significant changes in the world communications. Although technological evolution allowed creation new social event platforms to disclose events, it is still difficult know what happening around location. Currently, large events are created and promoted on networks. With massive quantity information these systems, finding an challenging because sometimes data ambiguous or incomplete. One main challenges classification related incompleteness ambiguity...

This work presents an experimental study related to the mechanical performance of a special design spring fabricated with superelastic shape memory alloy (SMA-SE). For testing, was coupled in rotor machine, aiming attenuate vibration when system went through natural frequency without any external power source. It verified that reduction instabilities stemmed from better distribution force proposed device, as well damping capacity material. These findings showed application M-Shape device...

The application of Shape Memory Alloys with superelastic behavior (SMA–SE) to reduce vibrations in rotor systems has been studied recent years. However, the current SMA damper device design does not prioritize improving distribution applied force due vibration levels. In this sense, paper aims study (theoretical and experimentally) two different types passive devices made a Ni-Ti SMA–SE be incorporated system order mechanical vibrations. Two physical situations were analyzed new designs (A...

In the forward flight, wind loads affect helicopters and cause vibration. This paper analyzes behavior of a helicopter prototype composed by two blades when subjected to front load, similar forwarding flight condition. An Artificial Neural Network (ANN) processes experimental data in order identify pattern its dynamic behavior. The tests led Vibration analysis for different speeds. Also, indicates that vibration amplitude increases are fundamental frequency first harmonic on conducted...

One of the main applications shape memory alloy (SMA) concerns vibration control, especially superelastic SMA (SMA-SE), which presents a significant stress hysteresis and can work as damper while adding minimal weight to structure. In helicopters, is phenomenon inherent their operation, although cannot be eliminated, must minimized acceptable levels safety comfort. this context, paper aims present design, testing, dynamic behavior new device entitled smart pitch link, with material for...

Fundamento A avaliação da área valvar mitral por meio reconstrução multiplano na ecocardiografia tridimensional é restrita a softwares específicos e à experiência dos ecocardiografistas. Eles precisam selecionar manualmente o frame do vídeo que contenha de abertura máxima valva mitral, dimensão fundamental para identificação estenose mitral. Objetivo Automatizar processo determinação aplicação Processamento Digital Imagens (PDI) em exames ecocardiograma, desenvolvendo um algoritmo aberto com...

Background: The evaluation of mitral valve area through multiplanar reconstruction in 3-dimensional echocardiography is restricted to specific software and the experience echocardiographers.They need manually select video frame that contains maximum opening area, as this dimension fundamental identification stenosis.Objective: To automate process determining application digital image processing (DIP) tests, developing an open algorithm with reading avi format.Method: This cross-sectional...

<title>Abstract</title> The vertical roller mill used in the cement industry is a large piece of equipment that works without interruption and essential production. Due to occurrence several breakdowns its components, mainly ends caused production stops, idea analyzing vibrations identify possible defect pattern arose. Sound analysis was performed during period terminal failures. application signal processing techniques such as FFT, multiresolution analysis, SAC-DM (chaos theory) allowed...

Currently, the evolution of technology allows to find which events occurs around us at any given location.Social networks are one reasons this trend and new applications emerging aiming finding disclosing events.This paper proposes a platform event searching.In particular, we propose architecture that uses machine learning classify with tags.An experimental evaluation different types algorithms was done using Facebook as source dataset events.