The Study of Quality Monitoring and Control for Laser Cutting Based on Pulse-Induced Acoustic Sound

2012 ◽  
Vol 182-183 ◽  
pp. 422-426 ◽  
Author(s):  
Hui Juan Hao ◽  
Guang He Cheng ◽  
Ji Yong Xu
Keyword(s):  
Adaptive Control ◽  
Laser Cutting ◽  
Cutting Speed ◽  
Processing Parameters ◽  
Wavelet Denoising ◽  
Quality Monitoring ◽  
Monitoring And Control ◽  
Time Frequency ◽  
And Control ◽  
The Impact

In this paper, the pulse-induced acoustic sound in laser cutting is collected, and the data processing is performed with wavelet denoising and time-frequncy analyzing. The impact of laser processing parameters on the acoustic signal is discussed; and further analysis of the effect of cutting speed is conducted. The corresponding relationship between the best velocity and the maximum time-frequency energy density is got; also the plan of adaptive control in laser cutting is designed. The results in this paper can provide important parameters for adaptive control of laser cutting.

Diagnosis and Modelling of Nonlinear Dynamics in Laser Cutting, Welding and Drilling

2004 ◽  
Vol 850 ◽  
Author(s):  
W. Schulz
Keyword(s):  
Laser Cutting ◽  
Modulation Frequency ◽  
Processing Parameters ◽  
Industrial Applications ◽  
Beam Power ◽  
Monitoring And Control ◽  
Laser Beam Power ◽  
Monitoring And Control Systems ◽  
And Control

ABSTRACTLaser cutting and welding are well established industrial applications. To maintain productivity and to guarantee product quality the industry tries to introduce monitoring and control systems. The long term goal is the autonomous laser machine. Signal assessment is advancing by monitoring and simulation of the dynamical processes. Applying the advanced results about diagnosis and modelling broadens the potentials to cope with productivity and quality features in drilling, trepanning and fine cutting.As result, in cutting two mechanisms for the formation of adherent dross are revealed theoretically, identified by the monitoring system and can be avoided by modulation of the laser beam power. In welding, the dynamic model predicts the formation of pores sets in or is suspended depending on modulation frequency for the laser power. In drilling the mechanisms governing the maximum depth of the drilled hole – still showing efficient melt removal – are identified experimentally and can be related to the processing parameters theoretically

scholarly journals Using a classifier ensemble for proactive quality monitoring and control: The impact of the choice of classifiers types, selection criterion, and fusion process

2018 ◽  
Vol 99 ◽  
pp. 193-204 ◽  
Author(s):  
Philippe Thomas ◽  
Hind Bril El Haouzi ◽  
Marie-Christine Suhner ◽  
André Thomas ◽  
Emmanuel Zimmermann ◽  
...  
Keyword(s):  
Selection Criterion ◽  
Fusion Process ◽  
Classifier Ensemble ◽  
Quality Monitoring ◽  
Monitoring And Control ◽  
And Control ◽  
The Impact

scholarly journals On Adaptive Control for Electrical Discharge Machining Using Vibroacoustic Emission

Technologies ◽  
2018 ◽  
Vol 6 (4) ◽  
pp. 96 ◽  
Author(s):  
Yury Melnik ◽  
Mikhail Kozochkin ◽  
Artur Porvatov ◽  
Anna Okunkova
Keyword(s):  
Adaptive Control ◽  
Control System ◽  
Electrical Discharge ◽  
Electrical Discharge Machining ◽  
Hard Alloys ◽  
Monitoring And Control ◽  
Working Zone ◽  
Conductive Ceramics ◽  
And Control ◽  
Adequate Data

The article is related to the research of the parameters of vibroacoustic emission for development of the monitoring and adaptive control system for electrical discharge machining. The classical control system based on a response of electrical parameters does not give an adequate data in the cases of a new class of materials processing as conductive ceramics reinforced by conductive nano additives and carbon nanotubes and whiskers. The idle pulses, which are working on the destruction of the erosion products in the gap, count as working pulses. The application of the monitoring and control tools based on vibroacoustic emission gives adequate data about conditions in the working zone. The developed system is available to count only impulses involved in working on the destruction of the workpiece. The experiments were conducted on the samples of materials with a low melting point as austenitic steel and aluminum alloy, and hard alloys. The records of vibroacoustic signals were analyzed for detection of the monitoring and adaptive control criteria.

The Impact of Mobile Phones on Teenagers' Socialization and Emancipation

2015 ◽  
pp. 12-24
Author(s):  
Kalogeraki Stefania ◽  
Papadaki Marina
Keyword(s):  
Mobile Phone ◽  
Mobile Phones ◽  
Parental Monitoring ◽  
Peer Group ◽  
Monitoring And Control ◽  
Group Interactions ◽  
The One ◽  
And Control ◽  
The Impact ◽  
Mobile Phone Communication

The mobile phone has become an indispensable mean of communication in the world today, and for teenagers specifically has become de rigueur in everyday life. The eagerness of teenagers to embrace mobile devices can be associated with such devices' instrumental as well as social and expressive functions. However, these functions are intertwined with critical impacts on the interaction between teenagers and parental/peer groups. On the one hand, the mobile phone acts as a symbolic “umbilical cord” that provides a permanent channel of communication, intensifying parental surveillance. On the other hand, it creates a greater space for interaction with peers beyond parental monitoring and control. This article summarizes current research and presents an empirical example of the impact of teenagers' mobile phone communication on the dynamics of parental and peer group interactions during their socialization and emancipation from the familial sphere.

scholarly journals Associations between Meteorological Factors and Visceral Leishmaniasis Outbreaks in Jiashi County, Xinjiang Uygur Autonomous Region, China, 2005–2015

2019 ◽  
Vol 16 (10) ◽  
pp. 1775 ◽  
Author(s):  
Yi Li ◽  
Canjun Zheng
Keyword(s):  
Relative Humidity ◽  
Visceral Leishmaniasis ◽  
Meteorological Factors ◽  
Public Health Problem ◽  
Monitoring And Control ◽  
Autonomous Region ◽  
Xinjiang Uygur Autonomous Region ◽  
Increasing Temperature ◽  
And Control ◽  
The Impact

Although visceral leishmaniasis disease is controlled overall in China, it remains a serious public health problem and remains fundamentally uncontrolled in Jiashi County, Xinjiang Uygur Autonomous Region. During 2005–2015, there were two outbreaks in Jiashi County. Assessing the influence of meteorological factors on visceral leishmaniasis incidence is essential for its monitoring and control. In this study, we applied generalized estimating equations to assess the impact of meteorological factors on visceral leishmaniasis risk from 2005 to 2015. We also compared meteorological factors among years with Kruskal–Wallis test to explore possible reasons behind the two outbreaks that occurred during our study period. We found that temperature and relative humidity had very significant associations with visceral leishmaniasis risk and there were interactions between these factors. Increasing temperature or decreasing relative humidity could increase the risk of visceral leishmaniasis events. The outbreaks investigated might have been related to low relative humidity and high temperatures. Our findings will support the rationale for visceral leishmaniasis control in China.

Modeling, Monitoring and Control in High Quality Laser Cutting

CIRP Annals ◽  
2001 ◽  
Vol 50 (1) ◽  
pp. 137-140 ◽  
Author(s):  
R. Poprawe ◽  
W. König
Keyword(s):  
Laser Cutting ◽  
Monitoring And Control ◽  
High Quality ◽  
And Control

A STUDY ON THE SURFACE QUALITIES OF FOUR POLYMER SUBSTRATE MICROCHANNELS USING CO2 LASER FOR MICROFLUIDIC CHIP

2019 ◽  
Vol 26 (03) ◽  
pp. 1850160
Author(s):  
ZENGLIANG HU ◽  
XUEYE CHEN ◽  
YI REN
Keyword(s):  
Polyethylene Terephthalate ◽  
Polymethyl Methacrylate ◽  
Microfluidic Chip ◽  
Laser Power ◽  
Laser Cutting ◽  
Cutting Speed ◽  
Processing Parameters ◽  
Polymer Substrate ◽  
Laser Machine ◽  
Polymer Substrates

The paper demonstrates four different polymer substrate microchannels are fabricated by CO2 laser machine. The four different polymer substrates are Polymethyl-methacrylate (PMMA), Polycarbonate (PC), Polystyrene (PS) and Polyethylene Terephthalate (PET), respectively. A number of microchannels are obtained and all roughness is measured. The four different polymer substrate microchannels are processed with different processing parameters. Laser power is set from 4[Formula: see text]W to 32[Formula: see text]W and laser cutting speed is set from 5[Formula: see text]mm/s to 30[Formula: see text]mm/s. The results show the roughness of PS substrate microchannel is lower than that of other three polymer substrate microchannels at the same parameters. When laser power is below 4[Formula: see text]W, the roughness of four polymer substrates are similar. The roughness of different polymer substrate microchannels decreases with the increase of laser power. The roughness of different polymer substrate microchannels also happens to change with increase of laser cutting speed.

Adaptive Control System to Assist the Surface Workpiece Quality when Drilling

2014 ◽  
Vol 474 ◽  
pp. 212-217 ◽  
Author(s):  
Marek Vrabel' ◽  
Ildikó Maňková ◽  
Jozef Beňo ◽  
Ladislav Kandráč ◽  
Jozef Stahovec
Keyword(s):  
Surface Roughness ◽  
Adaptive Control ◽  
Control System ◽  
Roughness Parameter ◽  
Cutting Speed ◽  
Constructional Material ◽  
Drilling Process ◽  
Adaptive Control System ◽  
Monitoring And Control ◽  
Surface Roughness Parameter

Article deals with design of adaptive control system for drilling process of aerospace critical components. The system proposed in this paper is directed towards real the time control of surface roughness parameter Ra. Proposed model for monitoring and control consists of surface roughness prediction system and decision making subsystem. The artificial neural network was employed to calculate surface roughness parameter Ra through of process monitoring indices such as torque Mz, force Fz, power P and cutting conditions feed f, cutting speed vc. Test samples were nickel based super alloy Udimet 720 used as a basic constructional material of discs for gas turbine engines.

scholarly journals Legal and formal analysis of chosen provisions of Directive 2009/30/EC and of the Act of 25 August 2006 on the fuel quality monitoring and control system

2019 ◽  
Vol 29 ◽  
pp. 171-181
Author(s):  
Weronika Gadzicka
Keyword(s):  
Control System ◽  
Formal Analysis ◽  
Quality Monitoring ◽  
Fuel Quality ◽  
Monitoring And Control ◽  
Monitoring And Control System ◽  
The Subject ◽  
Business Entities ◽  
Economic Analyses ◽  
And Control

The Directive 2009/30/EC and the Polish Act on the fuel quality monitoring and control system imposes a duty on the entities fulfilling the National Reduction Target NRT to reduce the emission of greenhouse gases to 6%. The reduction target of at least 6% can not be spread over the entire fuel market. It applies to every entity implementing the NRT separately. Member States, as well as the fuel market, are not responsible for not achieving the reduction target. This responsibility is limited to individual business entities implementing the NRT and concerns the fulfillment of the reduction target and the providing of the report on the implementation of the reduction target. It is necessary to carry out technical and economic analyses, the subject of which should be to answer the question of whether the entities realising the NRT are able to predict the potential amount of the fine that may be imposed on them based on art. 35c section 3 of the Act. Analiza prawna i formalna wybranych przepisów dyrektywy 2009/30/WE i ustawy z dnia 25 sierpnia 2006 roku o systemie monitorowania i kontroli jakości paliwDyrektywa 2009/30/WE oraz ustawa o systemie monitorowania i kontroli jakości paliw nakładają na podmioty spełniające Narodowy Cel Redukcyjny obowiązek obniżenia emisji gazów cieplarnianych do 6%. Cel redukcji wynoszący co najmniej 6% nie może być rozłożony na cały rynek paliw — dotyczy to każdego podmiotu wdrażającego NCR oddzielnie. Państwa członkowskie, jak też rynek paliw, nie ponoszą odpowiedzialności w wypadku nieosiągnięcia tegoż celu redukcyjnego. Odpowiedzialność ta jest ograniczona do poszczególnych podmiotów gospodarczych realizujących NCR i dotyczy realizacji celu redukcyjnego oraz dostarczenia sprawozdania z realizacji NCR. Konieczne jest przeprowadzenie analiz technicznych i ekonomicznych, których przedmiotem powinno być udzielenie odpowiedzi na pytanie, czy podmioty realizujące NRT są w stanie przewidzieć potencjalną kwotę grzywny, jaka może zostać na nie nałożona na podstawie art. 35c ust. 3 ustawy.

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