Abnormality Detection by Analysis of Cutting Sound

2004 ◽  
Vol 471-472 ◽  
pp. 172-177
Author(s):  
Lian Yi Chen ◽  
T. Osawa ◽  
H. Narita ◽  
Takashi Nakamura ◽  
H. Fujimoto
Keyword(s):  
Fourier Transform ◽  
Correlation Analysis ◽  
Machine Tools ◽  
Point Of View ◽  
Cutting Process ◽  
Network System ◽  
Abnormality Detection ◽  
Production Site ◽  
Long Time ◽  
Tele Monitoring

This study deals with the construction of network system for the production site, for the purpose of networking the machine tools as a part of the whole system. The Tele-monitoring for transformation of monitored information was studied. From the point of view of monitoring, the recognition of abnormal is very important in reducing the burden of an operator or for long-time unmanned operations. We then propose a method for the detection of abnormal in cutting process by analyzing the cutting sounds using Fourier transform, filtering, correlation analysis and statistic treatment. For the checking of tool wearing progressing, an experiment was arranged for the recognition of the sounds from a worn tip in comparison with a new one. On the detection of tipping of the cutter, a new tip is used for a long-time cutting without tool exchanging. The change of worn width and related values were compared with the original standard. It was found that the detection of tipping is possible by continuously sampling the cutting sounds and monitoring their correlation.

Adjustable wetting of Liquid Flame Spray (LFS) TiO2-nanoparticle coated board: Batch-type versus roll-to-roll stimulation methods

2014 ◽  
Vol 29 (2) ◽  
pp. 271-279 ◽  
Author(s):  
Mikko Tuominen ◽  
Hannu Teisala ◽  
Janne Haapanen ◽  
Mikko Aromaa ◽  
Jyrki M. Mäkelä ◽  
...  
Keyword(s):  
Argon Plasma ◽  
Ultra Violet ◽  
High Volume ◽  
Point Of View ◽  
Flame Spray ◽  
Ambient Conditions ◽  
Batch Type ◽  
Roll To Roll ◽  
Long Time ◽  
Liquid Flame Spray

Abstract Superhydrophobic nanoparticle coating was created on the surface of board using liquid flame spray (LFS). The LFS coating was carried out continuously in ambient conditions without any additional hydrophobization steps. The contact angle of water (CAW) of ZrO2, Al2O3 and TiO2 coating was adjusted reversibly from >150° down to ~10−20° using different stimulation methods. From industrial point of view, the controlled surface wetting has been in focus for a long time because it defines the liquid-solid contact area, and furthermore can enhance the mechanical and chemical bonding on the interface between the liquid and the solid. The used stimulation methods included batch-type methods: artificial daylight illumination and heat treatment and roll-to-roll methods: corona, argon plasma, IR (infra red)- and UV (ultra violet)-treatments. On the contrary to batch-type methods, the adjustment and switching of wetting was done only in seconds or fraction of seconds using roll-to-roll stimulation methods. This is significant in the converting processes of board since they are usually continuous, high volume operations. In addition, the creation of microfluidic patterns on the surface of TiO2 coated board using simple photomasking and surface stimulation was demonstrated. This provides new advantages and possibilities, especially in the field of intelligent printing. Limited durability and poor repellency against low surface tension liquids are presently the main limitations of LFS coatings.

Ground state molecular parameters of phosphine, PH3, from the simultaneous analysis of the high-resolution infrared, microwave and submillimeterwave spectra

1985 ◽  
Vol 50 (11) ◽  
pp. 2480-2492 ◽  
Author(s):  
Soňa Přádná ◽  
Dušan Papoušek ◽  
Jyrki Kauppinen ◽  
Sergei P. Belov ◽  
Andrei F. Krupnov ◽  
...  
Keyword(s):  
Fourier Transform ◽  
High Resolution ◽  
Ground State ◽  
Unitary Transformation ◽  
Point Of View ◽  
Acoustic Detection ◽  
Molecular Parameters ◽  
Microwave Spectrometer ◽  
Fourier Transform Spectra ◽  
First Time

Fourier transform spectra of the ν2 band of PH3 have been remeasured with 0.0045 cm-1 resolution. Ground state combination differences from these data have been fitted simultaneously with the microwave and submillimeterwave data to determine the ground state spectroscopical parameters of PH3 including the parameters of the Δk = ± 3n interactions. The correlation between the latter parameters has been discussed from the point of view of the existence of two equivalent effective rotational operators which are related by a unitary transformation. The ΔJ = 0, +1, ΔK = 0 (A1 ↔ A2, E ↔ E) rotational transitions in the ν2 and ν4 states have been measured for the first time by using a microwave spectrometer and a radiofrequency spectrometer with acoustic detection.

scholarly journals On Performance of Sparse Fast Fourier Transform Algorithms Using the Aliasing Filter

Electronics ◽  
2021 ◽  
Vol 10 (9) ◽  
pp. 1117
Author(s):  
Bin Li ◽  
Zhikang Jiang ◽  
Jie Chen
Keyword(s):  
Fourier Transform ◽  
Fast Fourier Transform ◽  
High Efficiency ◽  
Theory And Practice ◽  
Long Time ◽  
And Performance ◽  
Binary Tree Search ◽  
The One ◽  
Sparse Fast Fourier Transform ◽  
L1 And L2

Computing the sparse fast Fourier transform (sFFT) has emerged as a critical topic for a long time because of its high efficiency and wide practicability. More than twenty different sFFT algorithms compute discrete Fourier transform (DFT) by their unique methods so far. In order to use them properly, the urgent topic of great concern is how to analyze and evaluate the performance of these algorithms in theory and practice. This paper mainly discusses the technology and performance of sFFT algorithms using the aliasing filter. In the first part, the paper introduces the three frameworks: the one-shot framework based on the compressed sensing (CS) solver, the peeling framework based on the bipartite graph and the iterative framework based on the binary tree search. Then, we obtain the conclusion of the performance of six corresponding algorithms: the sFFT-DT1.0, sFFT-DT2.0, sFFT-DT3.0, FFAST, R-FFAST, and DSFFT algorithms in theory. In the second part, we make two categories of experiments for computing the signals of different SNRs, different lengths, and different sparsities by a standard testing platform and record the run time, the percentage of the signal sampled, and the L0, L1, and L2 errors both in the exactly sparse case and the general sparse case. The results of these performance analyses are our guide to optimize these algorithms and use them selectively.

scholarly journals Clutter Cancellation and Long Time Integration for GNSS-Based Passive Bistatic Radar

2021 ◽  
Vol 13 (4) ◽  
pp. 701 ◽  
Author(s):  
Binbin Wang ◽  
Hao Cha ◽  
Zibo Zhou ◽  
Bin Tian
Keyword(s):  
Fourier Transform ◽  
Target Detection ◽  
Time Integration ◽  
Detection Performance ◽  
Bistatic Radar ◽  
Detection Range ◽  
Robust Detection ◽  
Coherent Integration ◽  
Long Time ◽  
Long Time Integration

Clutter cancellation and long time integration are two vital steps for global navigation satellite system (GNSS)-based bistatic radar target detection. The former eliminates the influence of direct and multipath signals on the target detection performance, and the latter improves the radar detection range. In this paper, the extensive cancellation algorithm (ECA), which projects the surveillance channel signal in the subspace orthogonal to the clutter subspace, is first applied in GNSS-based bistatic radar. As a result, the clutter has been removed from the surveillance channel effectively. For long time integration, a modified version of the Fourier transform (FT), called long-time integration Fourier transform (LIFT), is proposed to obtain a high coherent processing gain. Relative acceleration (RA) is defined to describe the Doppler variation results from the motion of the target and long integration time. With the estimated RA, the Doppler frequency shift compensation is carried out in the LIFT. This method achieves a better and robust detection performance when comparing with the traditional coherent integration method. The simulation results demonstrate the effectiveness and advantages of the proposed processing method.

scholarly journals Light shaping from a physical-optics point of view

2020 ◽  
Vol 238 ◽  
pp. 02006
Author(s):  
Liangxin Yang ◽  
Irfan Badar ◽  
Christian Hellmann ◽  
Frank Wyrowski
Keyword(s):  
Fourier Transform ◽  
Optical Element ◽  
Initial Guess ◽  
Point Of View ◽  
Physical Optics ◽  
Diffraction Effect ◽  
Geometric Optics ◽  
Design Task ◽  
Tracing Techniques

In the design of optical element for light shaping, a geometric-optics assumption is usually used, where the validity of the assumption is rarely discussed in literature. In this work, the field tracing techniques for modeling light-shaping systems are presented, which reveals the optical element resulted from those geometric-base algorithm is not always accurate enough for the design task. An example is demonstrated with the functional embodiment of the element. The simulation result shows that diffraction effect may occur, especially in paraxial situation. However, the designed result start with the assumption is well-introduced initial guess for further optimization with the iterative Fourier transform algorithm (IFTA).

Bona fides and ubuntu – A response to Dale Hutchison

Acta Juridica ◽  
2021 ◽  
Vol 2021 ◽  
pp. 85-106
Author(s):  
J Barnard-Naudé
Keyword(s):  
South African ◽  
Common Law ◽  
Standard Form ◽  
Contract Law ◽  
Law School ◽  
Point Of View ◽  
Long Time ◽  
School Faculty ◽  
The Common ◽  
Faculty Meeting

This paper is a response to Dale Hutchison’s recent arguments about the role of fairness in contract law after the Constitution. From the point of view of transformative constitutionalism, the paper argues that the fairness ‘debate’ in the South African law of contract should be approached as what it so patently is, namely, as evidence of a deep ideological conflict that has existed in our law of contract for a very long time, and that this debate now exists within the context of a larger debate about the appropriate transformative reach of the Constitution. The argument takes the form of two ‘dangerous supplements’ to Hutchison’s discourse. The first of these supplements contends that indeterminacy is a symptom of the common law itself, rather than a result of contract law’s contact with the Constitution. The second dangerous supplement suggests a responsible judicial engagement with bona fides and ubuntu, one that can exploit the strengths of both the common law and the Constitution and that understands good faith and ubuntu to be ‘inter-linking’ constitutional values that should be enlisted in unison or at least in resonance when it comes to the question of fairness in our contemporary law of contract. In conclusion, I offer a reading of Hutchison’s own politics of contract law and contend that his is an altruistic politics committed to the standard form. I contend that this politics of contract law is consistent with a transformative understanding of the post-apartheid legal order. ‘Law, like every other cultural institution, is a place where we tell one another stories about our relationships with ourselves, one another, and authority. In this, law is no different from the Boston Globe, the CBS evening news, Mother Jones, or a law school faculty meeting. When we tell one another stories, we use languages and themes that different pieces of the culture make available to us, and that limit the stories we can tell. Since our stories influence how we imagine, as well as how we describe, our relationships, our stories also limit who we can be’.

Dynamisches Verhalten von Gestellwerkstoffen in Werkzeugmaschinen*/Dynamic behavior of different machine frame materials

2015 ◽  
Vol 105 (05) ◽  
pp. 263-268
Author(s):  
P. H. Nebeling
Keyword(s):  
Dynamic Behavior ◽  
Machine Tools ◽  
Dynamic Behaviour ◽  
Influencing Factor ◽  
Complex Structures ◽  
Geometric Properties ◽  
Long Time

Das dynamische Verhalten von Werkzeugmaschinen ist für die Stabilität während der Bearbeitung sowie die Qualität der erzeugten Werkstücke von besonderer Bedeutung. Ein Einflussfaktor darauf ist die Dämpfung. Im Bereich der Maschinengestelle kommen seit langer Zeit unterschiedliche Materialien zum Einsatz. In diesem Fachbeitrag werden die Dämpfungskennwerte unterschiedlicher Gestellwerkstoffe an geometrisch gleichen Proben vergleichend gegenübergestellt. Als weitere Kenngröße wurde die Lage der (1. Biege-) Eigenfrequenz als Maß für die massebezogene dynamische Steifigkeit verwendet. Die Effekte beim Übergang von einfachen Bauteilen zu komplexen Strukturen runden den Fachartikel ab.   The dynamic behaviour of machine tools is of great importance for stability and quality of the machined work pieces. One influencing factor in this area is damping. In the field of machine bases different materials have been use since long time. In this article the damping values of different materials with equal geometric properties are compared. As further parameter the first bending Eigenfrequency as dimension for mass related stiffness is use. The transition from simple components to complex structures is touched at the end of the paper.

scholarly journals Representação e ciências sociais

2016 ◽  
Vol 1 (1) ◽  
pp. 109-126
Author(s):  
Drance Elias da Silva
Keyword(s):  
Social Sciences ◽  
Knowledge Representation ◽  
Human Life ◽  
Point Of View ◽  
General View ◽  
Dominant Culture ◽  
The Real ◽  
The Social ◽  
Long Time ◽  
Expression Form

This Article may be situated within the rapport field between Philosophy and Social Sciences, at the search regarding to the concept concerning the Representation. Regarding to Philosophy, under a general view, the concept, concerning Representation, has been, since a long time, understood as a trail which one would get througl reaching to the real and true ones. Representation, as the thought contents expression form had not been known departing from Philosophy as a barrier against the objectivity concerning the knowledge. Representation, in its source, has been constituting itself a cognictive, inmanent reflection, related to the conscience inner subjectivity. But departing from the episthemological point of view, it has been not so easy for the campus concerning the Culture Sciences as a totality. In the theory regarding to knowledge, the Social Sciences campus and, more specifically, in the human life Symbolic dimension constitutive aspects, it has been, often, accepted negatively as an entry door for the histotical social reality. Nowadays, one may conclude that the contents concerning the Culture are deeply rooted within the histotical reality, which may present new dimension the reading regarding to the Symbolical side concerning the human life, under the view regarding to the unseen aspect, such as the intellectualistic Western dominant Culture allows understanding the way which could be in.

scholarly journals “Mother of the Faithful” and “Lion of Allah” in the Prophetic Tradition and Early History of the Caliphate or Why the Islamic Jama at Disintegrated?

2020 ◽  
Vol 16 (2) ◽  
pp. 47-56
Author(s):  
F. A. Asadullin
Keyword(s):  
Point Of View ◽  
Islamic Period ◽  
Islamic Schools ◽  
Regional Conflicts ◽  
Long Time ◽  
History Of ◽  
The Russian Federation ◽  
The One ◽  
Early Islamic Period ◽  
Early Islamic

The problem of disintegration of the Islamic Ummah a long time ago became the one of the most important for the Islamic world and worldview. The wave of violence in the Near and Middle East sharpened some regional conflicts, which have already taken place before. The paper deals with the roots of this conflict atmosphere in the Early Islamic period. As the tradition affirms, the Prophet Muhammad predicted the Ummah to split in 73 sects. Today there exist in any case not less than 73 different Islamic schools, movements and organizations, which mutually and constantly contest their doctrinal authenticity. Moreover, the activity of quasi- Islamic extremist organisations like the ISIS, which is forbidden inside as well as outside the Russian Federation, is quite remarkable. All these factors demonstrate, that from the academic point of view it is actual to critically research the nature of fragmentation and disintegration of Islamic communities through the prism of prophetic legends. This paper is to consider as an attempt to resolve this multidimensional problem.

scholarly journals Correlation of Parenting and Nutrient Intake with Stunting in Children 24-59 Months

2020 ◽  
Vol 2 (1) ◽  
pp. 280-285
Author(s):  
Nelly SD Situmeang ◽  
Etti Sudaryati ◽  
Jumirah
Keyword(s):  
Correlation Analysis ◽  
Nutrient Intake ◽  
Pearson Correlation ◽  
World Health ◽  
Cross Sectional ◽  
Growth Standards ◽  
Long Time ◽  
Surveillance Programs ◽  
Cross Sectional Design ◽  
Health Organization

Stunting is a chronic nutritional problem due to insufficient intake for a long time, in Indonesia the prevalence is high. The World Health Organization (WHO) classifies if the length/height z score is below −2 SD. The purpose of this study was to analyze the correlation between parenting, and nutrient intake (energy and protein) with stunting in children aged 24-59 years. This study used a cross sectional design with a sample of 117 children. Data collection was carried out with questionnaire instruments for parenting, and 24-hour food recall for nutritional intake. Data stunting was performed by comparing the height of the children measured by the WHO growth standards. Correlation analysis using Pearson correlation analysis. The results showed that the prevalence of stunting for children aged 24-59 months was 50.4%. There was a significant correlation between parenting with stunting (r = 0.287 and p = 0.02), energy intake with stunting (r = 0.215 and p = 0.020) and protein intake with stunting (r = 0.354 and p = 0.0001). It is recommended that the Ministry of Health improve nutrition surveillance programs, and encourage the community to monitor the growth of children under five years every month in health services.

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