Browsing by Author "Hamplová, Lenka"

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    Cutting process monitoring by means of acoustic emission method part I - New approach of acoustic emission sensor and part 11 - Transformation of acoustic emission into audible sound
    (Technical university of Liberec, Czech Republic, 2006-01-01) Žižka, Jan; Hána, Petr; Hamplová, Lenka; Motyčka, Zdeněk
    Development of modern society is converging to a status where many human actions can be performed by machines. To achieve production without human intervention, machines require artificial receptors. Data gathering for processing and analysis of signals, together with determination of feedback reactions can be achieved by a suitable decision maker unit. A sensed value suited to this so-called intelligent sensing process would be the acoustic emission signal. In the case of intelligent cutting tools this would require miniature highly sensitive sensors integrated into the cutting tool body. Part I of this paper deals with the possibility of practical usage of the piezoelectric properties of copolymer foils for the acoustic emission sensor as a transducer of a mechanical surface wave into electrical signal. Part II of the paper deals with the most fundamental requirement for monitoring of cutting conditions during machining, i.e. excellent processing of measured data. Data obtained from machining process obtained by means of acoustic emission sensors, as discussed in the first part of this article, have high-frequency and continuous character of a white noise. These data are very difficult to process. New apparatus for transformation of acoustic emission into audible sound in the workplace is presented. The first stage of processing is by listening to transformed data it is subjectively possible to recognize differences in audible spectrum, corresponding to different states of the cutting tool. The second step is visualization of the differences via the fast Fourier transform (FFT) in the spectrum graphic chart.
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    Ekonomicko-technická analýza investičního projektu rekonstrukce kotelen
    (2000-01-01) Hamplová, Lenka
    Bakalářská práce Ekonomicko technická analýza investičního projektu firmy Eurothermica, s.r.o. Dvůr Králové nad Labem dává jasné možnosti řešení situace v oblasti teplárenství. Pro naplnění ekologických ukazatelů při rekonstrukcích tepelných zdrojů ej možné využívat finanční prostředky ze zahraničních zdrojů. Práce jasně vymezuje cenové údaje topných médií s výhledem vývoje v příštích obdobích. Těmito údaji se mohou řídit při svém rozhodování české firmy a rozpočtové organizace bez ohledu na nedostatek vlastních finančních zdrojů.
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    Porovnání převodníků akustické emise pro účel obrábění
    (Technická Univerzita v Liberci, 2006-01-01) Hamplová, Lenka; Žižka, Jan
    This bachelor thesis is intent on both the comparison of different kinds of the acoustic emission transducers and the possibility of their application for cutting process sensing. The work is also focused on the PVDF film and piezoceramic transducers assembling into the tool holder shank and its functionality in the turning process.
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    Servisní služby - řešení zákaznických problémů
    (2003-01-01) Hamplová, Lenka