Applied sciences

Metrology and Measurement Systems

Content

Metrology and Measurement Systems | 2015 | vol. 22 | No 2 |

Abstract

The form, waviness and roughness components of a measured profile are separated by means of digital filters. The aim of analysis was to develop an algorithm for one-dimensional filtering of profiles using approximation by means of B-splines. The theory of B-spline functions introduced by Schoenberg and extended by Unser et al. was used. Unlike the spline filter proposed by Krystek, which is described in ISO standards, the algorithm does not take into account the bending energy of a filtered profile in the functional whose minimization is the principle of the filter. Appropriate smoothness of a filtered profile is achieved by selecting an appropriate distance between nodes of the spline function. In this paper, we determine the Fourier transforms of the filter impulse response at different impulse positions, with respect to the nodes. We show that the filter cutoff length is equal to half of the node-to-node distance. The inclination of the filter frequency characteristic in the transition band can be adjusted by selecting an appropriate degree of the B-spline function. The paper includes examples of separation of 2D roughness, as well as separation of form and waviness of roundness profiles.
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Abstract

Power electronic circuits (PECs) are prone to various failures, whose classification is of paramount importance. This paper presents a data-driven based fault diagnosis technique, which employs a support vector data description (SVDD) method to perform fault classification of PECs. In the presented method, fault signals (e.g. currents, voltages, etc.) are collected from accessible nodes of circuits, and then signal processing techniques (e.g. Fourier analysis, wavelet transform, etc.) are adopted to extract feature samples, which are subsequently used to perform offline machine learning. Finally, the SVDD classifier is used to implement fault classification task. However, in some cases, the conventional SVDD cannot achieve good classification performance, because this classifier may generate some so-called refusal areas (RAs), and in our design these RAs are resolved with the one-against-one support vector machine (SVM) classifier. The obtained experiment results from simulated and actual circuits demonstrate that the improved SVDD has a classification performance close to the conventional one-against-one SVM, and can be applied to fault classification of PECs in practice.
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Abstract

Modern production technology requires new ways of surface examination and a special kind of surface profile parameters. Industrial quality inspection needs to be fast, reliable and inexpensive. In this paper it is shown how stochastic surface examination and its proper parameters could be a solution for many industrial problems not necessarily related with smoothing out a manufactured surface. Burnishing is a modern technology widely used in aircraft and automotive industries to the products as well as to process tools. It gives to the machined surface high smoothness, and good fatigue and wear resistance. Every burnished material behaves in a different manner. Process conditions strongly influence the final properties of any specific product. Optimum burnishing conditions should be preserved for any manufactured product. In this paper we deal with samples made of conventional tool steel – Sverker 21 (X153CrMoV12) and powder metallurgy (P/M) tool steel – Vanadis 6. Complete investigations of product properties are impossible to perform (because of constraints related to their cost, time, or lack of suitable equipment). Looking for a global, all-embracing quality indicator it was found that the correlation function and the frequency analysis of burnished surface give useful information for controlling the manufacturing process and evaluating the product quality. We propose three new indicators of burnishing surface quality. Their properties and usefulness are verified with the laboratory measurement of material samples made of the two mentioned kinds of tool steel.
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Abstract

In this paper a prototype framework for simulation of wireless sensor network and its protocols are presented. The framework simulates operation of a sensor network with data transmission, which enables simultaneous development of the sensor network software, its hardware and the protocols for wireless data transmission. An advantage of using the framework is converging simulation with the real software. Instead of creating a model of the sensor network node, the same software is used in real sensor network nodes and in the simulation framework. Operation of the framework is illustrated with examples of simulations of selected transactions in the sensor network.
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Abstract

This paper presents maps of spatial distributions of the short circuit current Isc(x,y) and the open circuit voltage Uoc(x,y) of the investigated low cost solar cells. Visible differences in values of these parameters were explained by differences in the serial and shunt resistances determined for different points of solar cells from measurements of I–V characteristics. The spectral dependence of the photo voltage of solar cell is also shown, discussed and interpreted in the model of amorphous and crystal silicon.
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Abstract

Studies of noise properties of thick-film conducting lines from Au or PdAg conductive pastes on LTCC or alumina substrates are reported. Experiments have been carried out at the room temperature on samples prepared in the form of meanders by traditional screen-printing or laser-shaping technique. Due to a low resistance of the devices under test (DUTs), low-frequency noise spectra have been measured for the dc-biased samples arranged in a bridge configuration, transformer-coupled to a low-noise amplifier. The detailed analysis of noise sources in the signal path and its transfer function, including the transformer, has been carried out, and a procedure for measurement setup self-calibration has been described. The 1/f noise component originating from resistance fluctuations has been found to be dominant in all DUTs. The analysis of experimental data leads to the conclusion that noise is produced in the bends of meanders rather than in their straight segments. It occurs that noise of Au-based laser-shaped lines is significantly smaller than screen-printed ones. PdAg lines have been found more resistive but simultaneously less noisy than Au-based lines.
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Abstract

An original wireless sensor network for vibration measurements was designed. Its primary purpose is modal analysis of vibrations of large structures. A number of experiments have been performed to evaluate the system, with special emphasis on the influence of different effects on simultaneity of data acquired from remote nodes, which is essential for modal analysis. One of the issues is that quartz crystal oscillators, which provide time reading on the devices, are optimized for use in the room temperature and exhibit significant frequency variations if operated outside the 20–30°C range. Although much research was performed to optimize algorithms of synchronization in wireless networks, the subject of temperature fluctuations was not investigated and discussed in proportion to its significance. This paper describes methods used to evaluate data simultaneity and some algorithms suitable for its improvement in small to intermediate size ad-hoc wireless sensor networks exposed to varying temperatures often present in on-site civil engineering measurements.
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Abstract

The paper relates to the problem of adaptation of V-block methods to waviness measurements of cylindrical surfaces. It presents the fundamentals of V-block methods and the principle of their application. The V-block methods can be successfully used to measure the roundness and waviness deviations of large cylinders used in paper industry, shipping industry, or in metallurgy. The concept of adaptation of the V-block method to waviness measurements of cylindrical surfaces was verified using computer simulations and experimental work. The computer simulation was carried out in order to check whether the proposed mathematical model and V-block method parameters are correct. Based on the simulation results, a model of measuring device ROL-2 for V-block waviness measurements was developed. Next, experimental research was carried out consisting in evaluation of waviness deviation, initially using a standard non-reference measuring device, and then using the tested device based on the V-block method. Finally, accuracy of the V-block experimental method was calculated.
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Abstract

The paper deals with a study of relations between the measured Ra, Rq, Rz surface roughness parameters, the traverse speed of cutting head v and the vibration parameters, PtP, RMS, vRa, generated during abrasive water jet cutting of the AISI 309 stainless steel. Equations for prediction of the surface roughness parameters were derived according to the vibration parameter and the traverse speed of cutting head. Accuracy of the equations is described according to the Euclidean distances. The results are suitable for an on-line control model simulating abrasive water jet cutting and machining using an accompanying physical phenomenon for the process control which eliminates intervention of the operator.
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Abstract

Correct incipient identification of an analog circuit fault is conducive to the health of the analog circuit, yet very difficult. In this paper, a novel approach to analog circuit incipient fault identification is presented. Time responses are acquired by sampling outputs of the circuits under test, and then the responses are decomposed by the wavelet transform in order to generate energy features. Afterwards, lower-dimensional features are produced through the kernel entropy component analysis as samples for training and testing a one-against-one least squares support vector machine. Simulations of the incipient fault diagnosis for a Sallen-Key band-pass filter and a two-stage four-op-amp bi-quad low-pass filter demonstrate the diagnosing procedure of the proposed approach, and also reveal that the proposed approach has higher diagnosis accuracy than the referenced methods.
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Abstract

This paper presents the design process and the results of a novel fall detector designed and constructed at the Faculty of Electronics, Military University of Technology. High sensitivity and low false alarm rates were achieved by using four independent sensors of varying physical quantities and sophisticated methods of signal processing and data mining. The manuscript discusses the study background, hardware development, alternative algorithms used for the sensor data processing and fusion for identification of the most efficient solution and the final results from testing the Android application on smartphone. The test was performed in four 6-h sessions (two sessions with female participants at the age of 28 years, one session with male participants aged 28 years and one involving a man at the age of 49 years) and showed correct detection of all 40 simulated falls with only three false alarms. Our results confirmed the sensitivity of the proposed algorithm to be 100% with a nominal false alarm rate (one false alarm per 8 h).
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Abstract

Spectral remote sensing is a very popular method in atmospheric monitoring. The paper presents an approach that involves mid-infrared spectral measurements of combustion processes. The dominant feature in this spectral range is CO2 radiation, which is used to determine the maximum temperature of nonluminous flames. Efforts are also made to determine the temperature profile of hot CO2, but they are limited to the laboratory conditions. The paper presents an analysis of the radiation spectrum of a non-uniform-temperature gas environment using a radiative transfer equation. Particularly important are the presented experimental measurements of various stages of the combustion process. They allow for a qualitative description of the physical phenomena involved in the process and therefore permit diagnostics. The next step is determination of a non-uniform-temperature profile based on the spectral radiation intensity with the 8 m optical path length.
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Editorial office

Editor-in-Chief
  • Janusz SMULKO, Gdańsk University of Technology, Poland
International Programme Committee
  • Andrzej ZAJĄC, Chairman, Military University of Technology, Poland
  • Bruno ANDO, University of Catania, Italy
  • Martin BURGHOFF, Physikalisch-Technische Bundesanstalt, Germany
  • Marcantonio CATELANI, University of Florence, Italy
  • Numan DURAKBASA, Vienna University of Technology, Austria
  • Domenico GRIMALDI, University of Calabria, Italy
  • Laszlo KISH, Texas A&M University, USA
  • Eduard LLOBET, Universitat Rovira i Virgili, Tarragona, Spain
  • Alex MASON, Liverpool John Moores University, The United Kingdom
  • Subhas MUKHOPADHYAY, Massey University, Palmerston North, New Zealand
  • Janusz MROCZKA, Wrocław University of Technology, Poland
  • Antoni ROGALSKI, Military University of Technology, Poland
  • Wiesław WOLIŃSKI, Warsaw University of Technology, Poland
Associate Editors
  • Zbigniew BIELECKI, Military University of Technology, Poland
  • Vladimir DIMCHEV, Ss. Cyril and Methodius University, Macedonia
  • Krzysztof DUDA, AGH University of Science and Technology, Poland
  • Janusz GAJDA, AGH University of Science and Technology, Poland
  • Teodor GOTSZALK, Wrocław University of Technology, Poland
  • Ireneusz JABŁOŃSKI, Wrocław University of Technology, Poland
  • Piotr JASIŃSKI, Gdańsk University of Technology, Poland
  • Piotr KISAŁA, Lublin University of Technology, Poland
  • Manoj KUMAR, University of Hyderabad, Telangana, India
  • Grzegorz LENTKA, Gdańsk University of Technology, Poland
  • Czesław ŁUKIANOWICZ, Koszalin University of Technology, Poland
  • Rosario MORELLO, University Mediterranean of Reggio Calabria, Italy
  • Fernando PUENTE LEÓN, University Karlsruhe, Germany
  • Petr SEDLAK, Brno University of Technology, Czech Republic
  • Hamid M. SEDIGHI, Shahid Chamran University of Ahvaz, Ahvaz, Iran
  • Roman SZEWCZYK, Warsaw University of Technology, Poland
Language Editors
  • Andrzej Stankiewicz, Gdańsk University of Technology, Poland
Technical Editors
  • Agnieszka Kondratowicz, Gdańsk University of Technology, Poland

Contact

Editorial Office of Metrology and Measurement Systems

Contact:
E-mail: metrology@pg.edu.pl
URL: www.metrology.pg.gda.pl
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Post address:
Editorial Office of Metrology and Measurement Systems
Gdańsk University of Technology, Faculty of Electronics, Telecommunications and Informatics

Instructions for authors

Types of contributions

The following types of papers are published in Metrology and Measurement Systems:
•    invited review papers presenting the current stage of the knowledge (max. 20 edited pages, 3000 characters each),
•    research papers reporting original scientific or technological advancements (10‒12 pages),
•    papers based on extended and updated contributions presented at scientific conferences (max. 12 pages),
•    short notes, i.e. book reviews, conference reports, short news (max. 2 pages).

Manuscript preparation

The text of a manuscript should be written in clear and concise English. The form similar to “camera-ready” with an attached separate file – containing illustrations, tables and photographs – is preferred. For the details of the preferred format of the manuscripts, Authors should consult a recent issue of the journal or the sample article and the guidelines for manuscript preparation. The text of a manuscript should be printed on A4 pages (with margins of 2.5 cm) using a font whose size is 12 pt for main text and 10 pt for the abstract; an even number of pages is strongly recommended. The main text of a paper can be divided into sections (numbered 1, 2, ...), subsections (numbered 1.1., 1.2., ...) and – if needed – paragraphs (numbered 1.1.1., 1.1.2., ...). The title page should include: manuscript title, Authors’ names and affiliations with e-mail addresses. The corresponding Author should be identified by the symbol of an envelope and phone number. A concise abstract of approximately 100 words and with 3–5 keywords should accompany the main text.
Illustrations, photographs and tables provided in the camera-ready form, suitable for reproduction (which may include reduction) should be additionally submitted one per page, larger than final size. All illustrations should be clearly marked on the back with figure number and author’s name. All figures are to have captions. The list of figures captions and table titles should be supplied on separate page. Illustrations must be produced in black ink on white paper or by computer technique using the laser printer with the resolution not lower than 300 dpi, preferably 600 dpi. The thickness of lines should be in the range 0.2–0.5 mm, in particular cases the range 0.1–1.0 mm will be accepted. Original photographs must be supplied as they are to be reproduced (e.g. black and white or colour). Photocopies of photographs are not acceptable.
References should be inserted in the text in square brackets, e.g. [4]; their list numbered in citation order should appear at the end of the manuscript. The format of the references should be as follows: for a journal paper – surname(s) and initial(s) of author(s), year in brackets, title of the paper, journal name (in italics), volume, issue and page numbers. The exemplary format of the references is available at the sample article.

Manuscript submission and processing

Submission procedure. Manuscript should be submitted via Internet Editorial System (IES) ‒ an online submission and peer review system http://www.editorialsystem.com/mms
In order to submit the manuscript via IES, the authors (first-time users) must create an author account to obtain a user ID and password required to enter the system. From the account you create, you will be able to monitor your submission and make subsequent submissions.
The submission of the manuscript in two files is preferred: “Paper File” containing the complete manuscript (with all figures and tables embedded in the text) and “Figures File” containing illustrations, photographs and tables. Both files should be sent in DOC and PDF format as well as. In the submission letter or on separate page in “Figures File”, the full postal address, e-mail and phone numbers must be given for all co-authors. The corresponding Author should be identified.
Copyright Transfer. The submission of a manuscript means that it has not been published previously in the same form, that it is not under consideration for publication elsewhere, and that – if accepted – it will not be published elsewhere. The Author hereby grants the Polish Academy of Sciences (the Journal Owner) the license for commercial use of the article according to the Open Access License which has to be signed before publication.
Review and amendment procedures. Each submitted manuscript is subject to a peer-review procedure, and the publication decision is based on reviewers’ comments; if necessary, Authors may be invited to revise their manuscripts. On acceptance, manuscripts are subject to editorial amendment to suit the journal style.
An essential criterion for the evaluation of submitted manuscripts is their potential impact on the scientific community, measured by the number of repeated quotations. Such papers are preferred at the evaluation and publication stages.
Proofs. Proofs will be sent to the corresponding Author by e-mail and should be returned within 48 hours of receipt.

Other information

Author Benefits. The publication in the journal is free of charge. A sample copy of the journal will be sent to the corresponding Author free of charge.
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