National Repository of Grey Literature 40 records found  1 - 10nextend  jump to record: Search took 0.00 seconds. 
Non-destructive survey of the oldest part of the castle in Telč
Drdácký, Miloš ; Eisler, Marek ; Lesák, Jaroslav ; Válek, Jan ; Skružná, Olga
Recent archaeological findings discovered at an excavation in the southeastern section of the small courtyard of the old palace at the state castle in Telč sparked interest in further exploring hidden structures below ground and within the existing masonry. Therefore, a non-destructive survey of structures hidden beneath the current level of the courtyard using ground-penetrating radar was conducted, as was a survey of the masonry within the old walls of the palace using thermography.
Summary report on radiographic documentation of figurative decorations in the Bučovice castle ceremony hall
Valach, Jaroslav ; Eisler, Marek
This report summarizes the results of radiographic and endoscopic investigation of stucco and figural decorations located in the ceremony hall at the castle in Bučovice, Vyškov county. The internal structure of the statues and ornaments and their varying degree of fracture damage was documented using a portable set comprised of source and recording plates. The support structures used by the original artists as a vantage point for the modelling of their intended shapes were revealed and examined by means of radiography and endoscopy. This data is important for the art historian’s investigation of this cultural monument. Included in the report is a set of photographs and radiographs and their interpretation.
Localization of reinforcement in elements of reinforced concrete structure
Fusek, Aleš ; Anton, Ondřej (referee) ; Cikrle, Petr (advisor)
This bachelor thesis deals with the search for non-destructive methods of reinforcement in concrete structures using electromagnetic indicators. The theoretical part describes the methods of diagnosis reinforcement capabilities and limitations of the methods of electromagnetic indicators and comparisons with other methods. Furthermore, a overview of the reinforcement used in the 60s of the last century. The practical part describes the measurement on reinforced concrete construction hall and compares it with the measurement obtained on the models in the laboratory at the focus of the sensitivity of measurements and data processing.
The Use of the Ultrasonic Pulse Velocity Test for the Determination of Concrete Homogeneity in a Structure
Jindrová, Barbora ; Daněk, Petr (referee) ; Kocáb, Dalibor (advisor)
The bachelor thesis deals with the basics of diagnostics of structures and states the most frequently used methods. In the context of non-destructive diagnostics, there is described the ultrasonic pulse velocity test in detail, along with it’s principle and possible ways of application. The main content of the thesis is description and application of several approaches that are offered by the ultrasonic pulse testing instrument Pundit PL-200 by Proceq SA. The results of several measurements, performed both in laboratory and in situ, are processed here, focusing mainly on the assessment of the comparability of values acquired with different measuring settings on the same element. Another conclusion is the determination of concrete homogeneity in the structures according to the standard ČSN 73 2011.
Preliminary survey and assessment the building before renovation
Bartoň, Vojtěch ; Stehlík, Michal (referee) ; Cikrle, Petr (advisor)
This bachelor thesis deals with the construction and technical survey of a masonry building with cast iron columns. Construction-technical survey was carried out, due to the planned conversion of the building into a apartment building with public services. The thesis contains description of construction and technological survey and diagnostic methods, which includes evaluation of essential characteristics of masonry structures and cast iron columns. The practical part contains processing of diagnostic survey. Its result is determination of material and geometric characteristics of the structure.
Methods of non-destructive testing of materials and products
Vontor, Jakub ; Mouralová, Kateřina (referee) ; Prokeš, Tomáš (advisor)
The aim of this bachelor thesis is to perform a search of methods of non-destructive testing and to choose a right method for experimental test of sample. Bachelor thesis is mainly focused on the methods which are used for inspection of welds. Result of experimental non-destructive test is important to verify by destructive inspection.
Automation of test line for flaw detection of railway wheels
Hubený, Marek ; Matz,, Václav (referee) ; Pásek, Jan (advisor)
This thesis describes the design and implementation of a control system for testing line using ultrasonic testing and magnetic particle testing. The test line is designed for non-destructive testing of railway wheels with detection and localization of surface and subsurface defects. The thesis describes the design and operating principles of the test line. On this basis, the design of a control system that controls various processes throughout the test line is clearly described. The proposed control system was implemented in the industrial application.
Analysis of mini-jack technique for in situ measurement of strength
Kloiber, Michal ; Tippner, J. ; Kunecký, Jiří ; Sebera, V. ; Milch, J. ; Hrivnák, Jaroslav
The paper presents a recently developed diagnostic technique for in situ determination of modulus of deformability (MODL) and conventional strength (CSL) parallel to the grain using the mini-jack inserted in bored hole. The mini-jack compression technique simulates the standard compression test, it is compared to that to examine its prediction strength (correlation coefficients). The paper shows an influence of moisture content of wood on experimental measurements using this technique. The measurement was carried out at spruce samples at three moisture contents of 12, 18 and 24%. The results of the tests prove a very good correlation of the strength determined by the proposed technique and wood density and strength determined at universal testing machine in compression parallel to the grain. The effect of the moisture content on the measurement by the mini-jack technique was proved to be significant. Beside that, the newly-developed instrument was also studied using digital image correlation (DIC) technique to analyze induced strains around the bored hole. This was studied on halved spruce samples. The DIC revealed symmetric character of the loading and significant differences between strains induced in tangential and longitudinal directions.
On finite element modelling in time reversal problems
Mračko, Michal ; Kober, Jan ; Kolman, Radek ; Převorovský, Zdeněk ; Plešek, Jiří ; Masák, Jan ; Kruisová, Alena
In this paper we analyse suitability and accuracy of computational techniques in time reversal applications based on finite element method (FEM) for detection and localization of defects, cracks or other acoustic emission sources in bodies and structures. As it is known, a classical explicit integration scheme - central difference is reversible. The central difference scheme as a time integrator is widely used for linear and nonlinear finite element analyses and it is also implemented in commercial and open-source finite element software. In the paper properties of the explicit FEM in time reversal problems are studied and analysed. We use the standard Galerkin FEM formulation with linear shape functions, one-point Gauss integration and lumped mass matrix. Loading by the Ricker pulse was applied for modelling of the acoustic source in an elastic square domain. A special attention is paid to the choice of boundary conditions in reverse problem which keep the reversibility of problems of interest. Finally, we show the quality of refocusing of the original acoustic source.
Use of ultrasound testing of concrete in bridge structures
Hüblová, Sabina ; Komárková, Tereza (referee) ; Cikrle, Petr (advisor)
There are analyze kinds of diagnostic methods in terms of bachelor’s thesis. It is written about principles of ultrasonic pulse method and its options of usage on the current concrete structure. There are processed results of measurement on the testing samples which will be compared with results of stress strength. There is also spoken about calibration relationships in the bachelor’s thesis. Calibration relationships are described in Czech technical norms.

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