Evaluation of Inventory Surveying of Façade Scaffolding Conducted During ORKWIZ Project

Borowski, Łukasz; Pieńko, Michał; Wielgos, Piotr

doi:10.1109/bgc.geomatics.2017.31

Cited by 7 publications

(8 citation statements)

References 3 publications

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“…The process of the numerical model creation based e.g. on the geodetic inventory [3], [5] and verification of the model based on free vibrations measurements was presented in detail in the papers [8], [14]. The values of the modal participation factor for each mode shape in the directions X, Y and Z were obtained during the numerical modal analysis of each scaffolding.…”

Section: Numerical Analysismentioning

confidence: 99%

Archives of Civil Engineering

Bęc,

Błazik-Borowa,

Jamińska-Gadomska

et al. 2020

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The paper presents analysis of the vibrational environment on scaffoldings. It is based on the results obtained in the project considering workers safety on scaffoldings. The total number of 120 façade scaffoldings was analysed over a period of two years. One of the issues considered in this project was the vibrations influence on scaffoldings and workers safety. The values of natural frequencies were obtained based on in-situ measurements of free vibrations. Analysis of the tests results made it possible to verify the elaborated numerical models. Values of natural frequencies and displacements in mode shaped from numerical modal analyses were compared with test results. Measurements of forced vibrations were also made with various sources of vibrations active at scaffoldings. The detailed numerical dynamic analysis was performed considering excitation forces variable in time. The obtained results were compared with allowable values according to the appropriate Polish standards.Most influential sources of vibrations for human comfort were indicated in the conclusions.

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Section: Numerical Analysismentioning

confidence: 99%

Archives of Civil Engineering

Bęc,

Błazik-Borowa,

Jamińska-Gadomska

et al. 2020

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“…System) are widely used for navigation, positioning, scientific [1][2][3][4], and engineering applications [5][6][7]. That includes deformations [8][9][10] and structure monitoring [11][12][13], GIS (Geographic Information System) applications [14][15][16], land use [16][17][18][19], and cadastre [20][21][22][23][24]. Among the widely known positioning techniques, such as static measurements or RTK (Real Time Kinematic), PPP (Precise Point Positioning) is increasingly growing in use; it is a relatively new positioning technique, presented for the first time in [25].…”

Section: Gnss (Global Navigationmentioning

confidence: 99%

High-Rate Monitoring of Satellite Clocks Using Two Methods of Averaging Time

Maciuk

Lewińska

2019

Remote Sensing

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Knowledge of the global navigation satellite system (GNSS) satellite clock error is crucial in real-time precise point positioning (PPP), seismology, and many other high-rate GNSS applications. In this work, the authors show the characterisation of the atomic GNSS clock’s stability and its dependency on the adopted orbit type using Allan deviation with two methods of averaging time. Four International GNSS Service (IGS) orbit types were used: broadcast, ultra-rapid, rapid and final orbit. The calculations were made using high-rate 1 Hz observations from the IGS stations equipped with external clocks (oscillators). The most stable receiver oscillator was chosen as a reference clock. The results show the advantage of the newest GPS satellite block with respect to the other satellites. Significant differences in the results based on the orbit type used have not been recorded. Many averaging time methods used in Allan deviation (ADEV) show the clock’s fluctuations, usually smoothed in 2n s averaging times.

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“…Surveying engineering is an essential tool in construction works and civil engineering. For instance, surveying engineering is used to ensure that the layout of significant points on site is in accordance with the design, check that the maximum deflection of a bridge under controlled loading does not exceed a certain value, create digital terrain models (DTMs), inventory structural elements [1,2], or monitor the health of a structure [3,4]. In order to perform these tasks, there is a wide range of available surveying techniques: electronic the position coordinates are computed from other measurands such as angles, distances, or time signals.…”

Section: Introductionmentioning

confidence: 99%

Uncertainties estimation in surveying measurands: application to volumes

Covián,

Puente,

Casero

et al. 2024

Meas. Sci. Technol.

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Volume represents a measurand of great interest in civil engineering and construction works. The estimation of this measurand is a problem already solved by surveying engineering, but the quantification of its uncertainty has been overlooked. As a result, the inaccurate estimation of the volume can lead to significant deviations in the execution costs of earthworks. Moreover, it is not possible to comply with the internationally accepted requirements concerning the expression of measures with an indication of its uncertainty, i.e., the guidelines of the BIPM (Bureau International des Poids et Mesures). In this context, this paper presents a methodology for the quantification of uncertainty in the surveying measurement of volumes, which is generally carried out through digital terrain models processed by CAD or specific surveying software. Two methods for volume estimation are presented and the variance-covariance propagation laws are applied to each of them, leading to the computation of volume uncertainty from measures of position coordinates for which uncertainties are known. Then, the developed methods for uncertainty estimation are successfully tested in different scenarios. The conceptual and mathematical developments for the uncertainty quantification in the computation of volumes resulted in closed-form algorithms implemented in MATLAB that can be potentially incorporated into commercial surveying software.

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Evaluation of Inventory Surveying of Façade Scaffolding Conducted During ORKWIZ Project

Cited by 7 publications

References 3 publications

Archives of Civil Engineering

Archives of Civil Engineering

High-Rate Monitoring of Satellite Clocks Using Two Methods of Averaging Time

Uncertainties estimation in surveying measurands: application to volumes

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