scholarly journals Infrared Thermography for Elastic Abrasive Cutting Process Monitoring

2018 ◽  
Vol 210 ◽  
pp. 02018 ◽  
Author(s):  
Anna Stoynova ◽  
Irina Aleksandrova ◽  
Anatoly Aleksandrov ◽  
Geno Ganev
Keyword(s):  
Data Analysis ◽  
Infrared Thermography ◽  
Process Monitoring ◽  
Rotational Speed ◽  
Cutting Process ◽  
Heat Distribution ◽  
Workpiece Surface ◽  
Time Period ◽  
Measurement Results ◽  
Abrasive Cutting

This paper presents the features of infrared thermography (IRT) for contactless study of elastic abrasive cutting process of rotating workpieces. IRT monitoring specifics along with the experimental procedures and techniques for data analysis are discussed. IRT measurement results of the influence of workpiece rotational speed, during the processing of various materials, on heat release and heat distribution at the workpiece surface, on the cut-off wheel, the cut piece and the cutting time period are presented. The operational methodology and the results obtained can be used for optimizing the abrasive cutting of rotating workpieces.

Ultraschallüberlagertes Trennschleifen von Faserverbundwerkstoffen*/Ultrasound abrasive cutting of fiber composites - Survey on the potential and mode of action

2016 ◽  
Vol 106 (01-02) ◽  
pp. 39-43
Author(s):  
Y. Babenko ◽  
T. Mayer ◽  
A. Gebhardt
Keyword(s):  
Surface Quality ◽  
Process Parameters ◽  
Mode Of Action ◽  
Fiber Composites ◽  
Cutting Process ◽  
Force Analysis ◽  
Abrasive Cutting

Dieser Fachartikel befasst sich mit der Untersuchung des Potentials der Ultraschallüberlagerung beim Trennschleifen moderner Faserverbundwerkstoffe. Es wurde eine Zerspankraftanalyse des Trennschleifprozesses am CFK-Werkstück mit variierenden Prozessparametern durchgeführt. Zudem wurden die Oberflächenqualitäten der Schnittkanten betrachtet.   The presented study describes the investigation of the potential of ultrasound abrasive cutting of modern fiber composites. A force analysis of the abrasive cutting process of CFRP was conducted, while the process parameters were varied. In addition, the surface quality of the machined workpieces was observed.

Heat Transfer Measurements in an Internal Cooling System Using a Transient Technique With Infrared Thermography

2012 ◽  
Author(s):  
Christian Egger ◽  
Jens von Wolfersdorf ◽  
Martin Schnieder
Keyword(s):  
Heat Transfer ◽  
Data Analysis ◽  
Infrared Thermography ◽  
Outer Surface ◽  
Cooling System ◽  
Internal Cooling ◽  
Test Model ◽  
Cooling Channel ◽  
Transfer Coefficients ◽  
Heat Transfer Coefficients

In this paper a transient method for measuring heat transfer coefficients in internal cooling systems using infrared thermography is applied. The experiments are performed with a two-pass internal cooling channel connected by a 180° bend. The leading edge and the trailing edge consist of trapezoidal and nearly rectangular cross sections, respectively, to achieve an engine-similar configuration. Within the channels rib arrangements are considered for heat transfer enhancement. The test model is made of metallic material. During the experiment the cooling channels are heated by the internal flow. The surface temperature response of the cooling channel walls is measured on the outer surface by infrared thermography. Additionally, fluid temperatures as well as fluid and solid properties are determined for the data analysis. The method for determining the distribution of internal heat transfer coefficients is based on a lumped capacitance approach which considers lateral conduction in the cooling system walls as well as natural convection and radiation heat transfer on the outer surface. Because of time-dependent effects a sensitivity analysis is performed to identify optimal time periods for data analysis. Results are compared with available literature data.

Advanced infrared thermography data analysis for unsteady boundary layer transition detection

2019 ◽  
Vol 31 (1) ◽  
pp. 015301 ◽  
Author(s):  
C Mertens ◽  
C C Wolf ◽  
A D Gardner ◽  
F F J Schrijer ◽  
B W van Oudheusden
Keyword(s):  
Boundary Layer ◽  
Data Analysis ◽  
Infrared Thermography ◽  
Boundary Layer Transition ◽  
Unsteady Boundary Layer ◽  
Layer Transition

scholarly journals Comments on: involving service users in the qualitative analysis of patient narratives to support healthcare quality improvement

2019 ◽  
Vol 5 (1) ◽  
Author(s):  
Marney Williams ◽  
Mike Etkind ◽  
Fran Husson ◽  
Della Ogunleye ◽  
John Norton
Keyword(s):  
Quality Improvement ◽  
Data Analysis ◽  
Healthcare Quality ◽  
English Summary ◽  
Service Users ◽  
Research Projects ◽  
Period Analysis ◽  
Patient Narratives ◽  
Time Period ◽  
Alternative Approach

Plain English summary Some previous researchers (Locock et al) have written about what may be the best way for public contributors to be involved in data analysis in research projects. Their experience has been that giving public contributors large amounts of text to read is not the best use of their time and experience. They have recommended that a better approach would be for a researcher to meet with a group of users at the start of analysis, to discuss what to look out for. However, as another patient group that has been involved in analysis, we think differently. The approach we used was to be more fully involved in the project over a longer time period. Analysis tasks were broken down into stages to make it easier for those taking part. We found that this allowed us to take part fully without placing too much burden on us. We found that our approach was workable and successful and see no reason why it could not be applied in other circumstances. Abstract In this journal, Locock et al. have suggested that service users should not be overburdened with large amounts of data, and that eliciting users’ reflections on their experience at the start of analysis and using this as a guide to direct researcher attention during the remainder of the process may work better. As public contributors that have been involved in analysis we suggest an alternative approach in this brief letter, based on our own experiences.

scholarly journals Analysis of Flatness Deviations for Austenitic Stainless Steel Workpieces after Efficient Surface Machining

2014 ◽  
Vol 14 (4) ◽  
pp. 204-212 ◽  
Author(s):  
K. Nadolny ◽  
W. Kapłonek
Keyword(s):  
Stainless Steel ◽  
Austenitic Stainless Steel ◽  
Experimental Tests ◽  
Machining Process ◽  
Roughness Parameters ◽  
Workpiece Surface ◽  
Surface Machining ◽  
Measurement Results ◽  
Surface Flatness ◽  
Surface Topographies

Abstract The following work is an analysis of flatness deviations of a workpiece made of X2CrNiMo17-12-2 austenitic stainless steel. The workpiece surface was shaped using efficient machining techniques (milling, grinding, and smoothing). After the machining was completed, all surfaces underwent stylus measurements in order to obtain surface flatness and roughness parameters. For this purpose the stylus profilometer Hommel-Tester T8000 by Hommelwerke with HommelMap software was used. The research results are presented in the form of 2D surface maps, 3D surface topographies with extracted single profiles, Abbott-Firestone curves, and graphical studies of the Sk parameters. The results of these experimental tests proved the possibility of a correlation between flatness and roughness parameters, as well as enabled an analysis of changes in these parameters from shaping and rough grinding to finished machining. The main novelty of this paper is comprehensive analysis of measurement results obtained during a three-step machining process of austenitic stainless steel. Simultaneous analysis of individual machining steps (milling, grinding, and smoothing) enabled a complementary assessment of the process of shaping the workpiece surface macro- and micro-geometry, giving special consideration to minimize the flatness deviations

Analysis of Data Obtained from a Frequency-Multiplexed Phase-Modulation Fluorometer Using an Autoregressive Model

2007 ◽  
Vol 61 (9) ◽  
pp. 950-955 ◽  
Author(s):  
Tetsuo Iwata ◽  
Akitaka Muneshige ◽  
Tsutomu Araki
Keyword(s):  
Mathematical Method ◽  
Data Analysis ◽  
Phase Modulation ◽  
Rhodamine 6G ◽  
Volume Ratio ◽  
Ar Model ◽  
Accurate Data ◽  
Fluorescence Lifetimes ◽  
Real Samples ◽  
Measurement Results

In order to derive plural values of fluorescence lifetimes simultaneously from a multi-component sample, we formulate a mathematical method for analyzing data obtained from a frequency-multiplexed phase-modulation fluorometer (FM-PMF) using an autoregressive (AR) model. Various parameter settings necessary for performing accurate data analysis based on the AR model are studied through numerical simulations. Measurement results of fluorescence lifetimes of real samples, 10 ppm quinine sulfate in 0.1 N H2SO4, 10 ppm rhodamine 6G in ethanol, and their mixture with a volume ratio of 1:1, demonstrate that the proposed method works quite well.

Broaching of Ti-6-4 – Detection of Workpiece Surface Anomalies on Dovetail Slots through Process Monitoring

CIRP Annals ◽  
2005 ◽  
Vol 54 (1) ◽  
pp. 87-90 ◽  
Author(s):  
D. Axinte ◽  
F. Boud ◽  
J. Penny ◽  
N. Gindy ◽  
D.J. Williams
Keyword(s):  
Process Monitoring ◽  
Workpiece Surface
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