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Wyświetlanie 1-10 z 66
Tytuł:
Optimization Method Based on Minimization M-Order Central Moments Used In Surveying Engineering Problems
Autorzy:
Cellmer, Sławomir
Bobojć, Andrzej
Tematy:
Least Squares method
Newton method
objective function
m-estimation
surveying engineering
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Wydawca:
Uniwersytet Warmińsko-Mazurski w Olsztynie
Powiązania:
https://bibliotekanauki.pl/articles/2069748.pdf  Link otwiera się w nowym oknie
Opis:
A new optimization method presented in this work – the Least m-Order Central Moments method, is a generalization of the Least Squares method. It allows fitting a geometric object into a set of points in such a way that the maximum shift between the object and the points after fitting is smaller than in the Least Squares method. This property can be very useful in some engineering tasks, e.g. in the realignment of a railway track or gantry rails. The theoretical properties of the proposed optimization method are analyzed. The computational problems are discussed. The appropriate computational techniques are proposed to overcome these problems. The detailed computational algorithm and formulas of iterative processes have been derived. The numerical tests are presented, in order to illustrate the operation of proposed techniques. The results have been analyzed, and the conclusions were then formulated.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of thermography in engineering measurements
Autorzy:
Wróbel, A.
Tematy:
termografia
pomiary inżynieryjne
pomiary geodezyjne
thermography
engineering measurements
engineering surveying
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Wydawca:
Politechnika Warszawska. Wydział Geodezji i Kartografii
Powiązania:
https://bibliotekanauki.pl/articles/225027.pdf  Link otwiera się w nowym oknie
Opis:
- Existing thermographic equipment provides tools for quick and accurate recording of temperature distribution on object surfaces. - Usage of image analysis methods commonly used for photogrammetry and remote sensing provides tools for making accurate maps of temperature distribution on chosen, characteristic surfaces. - Documentation of thermal condition of new buildings should be a mandatory part of the post-construction documentation. - Real-world thermal resistance of buildings should be a factor during assertion of fulfilment of the architectural project and during valuation of buildings.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Quality analysis testing for quantifying reliability properties
Autorzy:
Nowak, E.
Tematy:
kryterium niezawodnościowe
projektowanie niezawodnościowe
pomiary geodezyjne
reliability criterion
engineering surveying
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Wydawca:
Politechnika Warszawska. Wydział Geodezji i Kartografii
Powiązania:
https://bibliotekanauki.pl/articles/224518.pdf  Link otwiera się w nowym oknie
Opis:
Quality control generally requires data of higher quality to quantify the error in any measured quantity. The following work shows that the Proszyhski Reliability Criterion (PRC) is fulfilled if the measurement variance is greater than its prediction function based on the remaining observations. The partial derivatives with respect to the parameters of the residuals' equations are taking the role of the observations within the system. Therefore the prediction variance can be measured. If the prediction function is bounded then a reliable observational system (i.e. each observation has fulfilled the PRC) can be achieved.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Geodesy monitoring of deflexion of a crane of suspension roof of a hall - conception, constructing solution and test measurements of measuring system
Autorzy:
Bryś, H.
Ćmielewski, K.
Kowalski, K.
Tematy:
kamera CCD
dźwigar
pomiary geodezyjne
CCD camera
crane
engineering surveying
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Wydawca:
Politechnika Warszawska. Wydział Geodezji i Kartografii
Powiązania:
https://bibliotekanauki.pl/articles/224424.pdf  Link otwiera się w nowym oknie
Opis:
A set of measuring system with use of laser technique and CCD converter connected to the computer presented in the study, carries out remote and automatic observation of deflection of carrier of rafter framing. Test measurements of simulated shifts of the prototype of photo-detection CCD receiver allowed initial definition of accuracy of the measurements of the situation of energetic middle of laser beam. From numerous measurements for the distance of 14 ma and vertical shifts within 35 mm, the maximal error equaled 0,04 mm and for 28 m it was 0,09 mm. Fluctuation effect of the situation of energetic middle of laser beam registered by measuring receiver in 10 seconds was also researched. Quickly changing variations of beam situation consisted in the range of 22,45 to 22,71 mm. Dispersion of vertical situation of laser spot did not exceed 0,26 mm. Registration and averaging of geometric middle of laser spot can be made with unrestricted time step.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Research the Integration of Geodetic and Geotechnical Methods in Monitoring the Horizontal Displacement of Diaphragm Walls
Autorzy:
Pham, Quoc Khanh
Tran, Ngoc Dong
Nguyen, Thi Kim Thanh
Pham, Van Chung
Tematy:
deformation monitoring
diaphragm wall
engineering surveying
soft ground
deformacje
monitoring
grunt
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Wydawca:
Polskie Towarzystwo Przeróbki Kopalin
Powiązania:
https://bibliotekanauki.pl/articles/2020165.pdf  Link otwiera się w nowym oknie
Opis:
This article investigates the integration of geodetic and geotechnical methods for monitoring the horizontal displacement of diaphragm walls. The results show that when the horizontal displacement is measured by the geotechnical method using an inclinometer sensor, the center point at the bottom of the guide pipe is usually chosen to be the origin to calculate displacements of the upper points. However, it is challenging to survey the bottom point for checking its stability directly. If this bottom point moves, the observation results will be incorrect. Thus, the guide pipe must be installed in the stable rock layer. But in the soft ground, this rock layer locates more deeply than the diaphragm walls, so the guide pipe cannot be laid out at the required location. Geodetic methods can directly observe the displacement of the center point on the top of the guide pipe with absolute displacement values at high accuracy. Because the displacements of observation points are determined at stable benchmarks, these values are considered the pipe's displacement. Thus, an integrated solution allows the center point on the top of the pipe to be the origin to calculate the displacements of different points located inside the diaphragm wall. Then, the calculated values are calibrated back to the inclinometer observed values to achieve highly reliable displacement, which reflects the moving of diaphragm walls. An experiment integrating the geodetic and geotechnical methods is conducted with an observation point at a depth of 20 meters at a construction site in Ho Chi Minh city. The deviations of the top point that are observed by the two methods are -4.37 millimeters and -3.69 millimeters on the X-axis and the Y-axis, respectively. The corrected observed results prove that the integrated solution has a good efficiency in monitoring the horizontal displacement of diaphragm walls. The bottom point observed by an inclinometer is unconfident enough to choose to be a reference point.
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-10 z 66

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