scholarly journals Advanced Power Line Diagnostics Using Point Cloud Data—Possible Applications and Limits

2021 ◽  
Vol 13 (10) ◽  
pp. 1880
Author(s):  
Marek Siranec ◽  
Marek Höger ◽  
Alena Otcenasova

The advance in remote sensing techniques, especially the development of LiDAR scanning systems, allowed the development of new methods for power line corridor surveys using a digital model of the powerline and its surroundings. The advanced diagnostic techniques based on the acquired conductor geometry recalculation to extreme operating and climatic conditions were proposed using this digital model. Although the recalculation process is relatively easy and straightforward, the uncertainties of input parameters used for the recalculation can significantly compromise such recalculation accuracy. This paper presents a systematic analysis of the accuracy of the recalculation affected by the inaccuracies of the conductor state equation input variables. The sensitivity of the recalculation to the inaccuracy of five basic input parameters was tested (initial temperature and mechanical tension, elasticity modulus, specific gravity load and tower span) by comparing the conductor sag values when input parameters were affected by a specific inaccuracy with an ideal sag-tension table. The presented tests clearly showed that the sag recalculation inaccuracy must be taken into account during the safety assessment process, as the sag deviation can, in some cases, reach values comparable to the minimal clearance distances specified in the technical standards.

Author(s):  
Y. R. He ◽  
W. W. Ma ◽  
X. R. Wang ◽  
J. Q. Dai ◽  
J. L. Zheng

Abstract. The power patrol has been completed by manual field investigation, which is inefficient, costly and unsafe. In order to extract the height of the power line and its surrounding ground objects more quickly and conveniently, and better service for power line patrol. This paper uses remote sensing data of unmanned aerial vehicle to carry out aerial triangulation, stereo model establishment and binocular stereo vision height extraction base on MapMatrix software, then obtains the power line height analysis chart. Then LiDAR point cloud data is used to verify the accuracy of the power line height analysis chart. The results show that this method not only meets the standard of power line patrol, but also improves the efficiency and quality of power line patrol.


2020 ◽  
pp. 350-360
Author(s):  
V. Bolshakov ◽  
Yu. Maznichenko ◽  
Yu. Holub ◽  
M. Molyboha ◽  
I. Samoilenko

The systematic analysis of the world experience of civilian use of knives not as cold weapons showed that at present the knife did not become the main attribute of equipping tourists, fish men and even hunters. In particular, today there are very few types of hunting, during which the knife is used to finish off the beast or to protect against it. At the same time, as the practice of hunting management proves, during hunting there are many uses for the knife, even without considering it as a means for cooking. This, in particular, sharpening various stakes (for a tent, a hut, a campfire), skinning a game, preparing chips for a fire, scraping ice from skis or marsh mud from shoes. To do this, in accordance with current state technical standards, any folding knife must have a lock, and the blades of all knives must be of sufficient thickness so as not to break from the load. Handles of hunting knives should be comfortable to hold so that your hand will not get tired during long-term work. For all knives, according to the technical requirements, the length and thickness of the blade must be consistent, as well as the angle of inclination of the tip relative to the axis of the blade. With regard to the above, an interesting example is the collection of knives by the Swedish company Eriksson, consisting of four models, made in the configuration of the Swedish finca. The knives have a handle and a blade of a classic Finnish knife, but with a one-sided stopper. Their blades, depending on the color of the handle, are made of different types of steel. Knives with blue plastic handles have stainless steel blades, and knives with red handles are made of carbon steel. It is believed that in Sweden almost every construction worker walks with such a knife in his pocket. It should be noted that according to the current method of forensic investigation of cold weapons and structurally similar products in it, these knives can be attributed to cold weapons by the size of the blade. It is also interesting an urban-type knife, which is not a cold weapon of the Worden Tactical Medium Company. Renowned wizard Kelly Warden, an instructor for American Rangers, designs this knife. Since 2001, Kelly Warden has been the main consultant on impact and blade weapons of Detachment 1 of the US Special Forces. He trains Special Forces hand-to-hand combat with the use of a knife, machete, baton, sticks, as well as the method of forceful detention. The blade length of the knife described is 74 mm, thickness – 3.8 mm; the handle has a sub-finger protrusion to prevent the arm from slipping on the blade. The knife does not have a standard stopper, which, in addition to protecting it from slipping the hand on the blade, must prevent the hand from sinking into the victim’s body. By all measures, this knife is not a cold weapon in accordance with the requirements of the criminal law of Ukraine. Kelly Warden believes that the knife as a means of self-defense levels the difference in weight, height and physical strength, but its main drawback is its damaging ability. The proposed article is devoted to this circumstance, the definition of the role of the restrictor in classifying a knife as a cold weapon.


2021 ◽  
Vol 1203 (2) ◽  
pp. 022043
Author(s):  
Ales Kankovsky ◽  
Martin Dedic

Abstract The main objective of the article is to inform about the wood flooring in combination with underfloor water heating systems. Wood is a very sensitive material that responds to its surroundings. For this reason, it is necessary to select a suitable wood, meeting the criteria of suitability for laying as flooring in combination with underfloor heating systems. It is also important to comply with the conditions of storage of wooden flooring and its installation under acceptable climatic conditions at the construction site, together with the technical regulations for the installation of wooden flooring in combination with underfloor heating systems, during the whole life cycle of the wood flooring. This article defines the basic input premise for the implementation of wooden floors in combination with underfloor heating systems, regarding the relevant technical standards and technological procedures valid in the Czech Republic. At the same time, the article describes possible failures of wooden floors in case of non-compliance with the above conditions. In the conclusion, we propose measures based on the described installation process failures of the wooden flooring in combination with underfloor heating systems, and after its use.


2012 ◽  
Vol 490-495 ◽  
pp. 143-146
Author(s):  
Miao Gong ◽  
Hao Wang ◽  
Li Wen Wang

This paper made the 3D model reconstruction of the J34 turban blade. First, collected rough points cloud data by using visual measuring equipment. Then, smoothed and filtered the point cloud data, took the rational simplification, finished pre-processing the point cloud data. Finally, the Laplacian of Guassian Detection was used for fitting the edge of turban blade, and reconstructed the 3D digital model. The results proved that this method improved smoothness of the model, and reduced time and cost of modeling and machining.


Energies ◽  
2021 ◽  
Vol 14 (10) ◽  
pp. 2847
Author(s):  
Alessandro Franco ◽  
Carlo Bartoli ◽  
Paolo Conti ◽  
Lorenzo Miserocchi ◽  
Daniele Testi

The paper provides a methodology for the optimal control of heating, ventilation, and air conditioning (HVAC) systems used in public buildings, with the purpose of obtaining high comfort and safety standards along with energy efficiency. The combination of the two concurrent objectives of minimizing energy use and guaranteeing high standards of occupant comfort is obtained by means of multi-objective optimization, in which a comfort model is combined along with a dynamic energy model of the building. The use of dynamic setpoints for the HVAC and the inclusion of comfort indicators represent a step forward, compared to the current design and operation procedures suggested by technical standards. The utilization of the proposed methodology is tested with reference to a case study, represented by an academic building used by the University of Pisa for educational purposes, whose extensive and variable occupancy can help to emphasize the importance of comfort in the operation of HVAC systems in different climatic conditions and with different occupancy profiles. We show how this optimization brings interesting results in terms of energy-saving (up to 30%), obtaining an increased comfort level (of more than 25%) compared to the operating conditions suggested by technical standards.


Author(s):  
Elena Generalova ◽  
Victor Generalov ◽  
Anna Kuznetsova

The paper examines innovative and promising trends in in the design of high-rise buildings that challenge traditional typologies and are adapted for specific climatic conditions. The purpose of the study is to investigate modern methods of designing building envelopes for bioclimatic skyscrapers taking into account heat impact of climate on the thermal balance of buildings. The research methodology is based on a systematic analysis of advanced world experience in constructing innovative buildings, "conquering" climate. The paper provides the basic principles of bioclimatic architecture. The issues of buildings’ forms and modes are considered. The authors analyze the efficiency of using double facades in different climatic conditions with account of their interaction with other technological, constructive and planning elements, such as "solar chimney", passive and active solar control systems, landscaping, intelligence control systems of temperature and humidity conditions in premises and buildings, etc. The paper highlights that unique objects of bioclimatic skyscrapers are moving now into new typologies of buildings and help form dense, comfortable and convenient urban environment using natural resources effectively. The research shows how prospects and relevance of a systemic approach to introducing the related and interdependent projects for energy saving activities at all levels, starting from town-planning and architectural models, and ending with engineering and constructive solutions.


Author(s):  
M. Awrangjeb ◽  
M. K. Islam

High density airborne point cloud data has become an important means for modelling and maintenance of a power line corridor. Since, the amount of data in a dense point cloud is huge even in a small area, an automatic detection of pylons in the corridor can be a prerequisite for efficient and effective extraction of wires in a subsequent step. However, the existing solutions mostly overlook this important requirement by processing the whole data into one go, which nonetheless will hinder their applications to large areas. This paper presents a new pylon detection technique from point cloud data. First, the input point cloud is divided into ground and nonground points. The non-ground points within a specific low height region are used to generate a pylon mask, where pylons are found stand-alone, not connected with any wires. The candidate pylons are obtained using a connected component analysis in the mask, followed by a removal of trees by comparing area, shape and symmetry properties of trees and pylons. Finally, the parallelism property of wires with the line connecting pair of candidate pylons is exploited to remove trees that have the same area and shape properties as pylons. Experimental results show that the proposed technique provides a high pylon detection rate in terms of completeness (100 %) and correctness (100 %).


Author(s):  
Thomas L. Seamster ◽  
Eleana S. Edens

A cognitive model of instructor Crew Resource Management (CRM) assessment was developed as an integral component of a prototype CRM assessment expert system. The cognitive model provides an instructor-centered approach to CRM assessment in the multi-tasking, time-constrained environment of recurrent Line-Oriented Flight Training (LOFT). This cognitive modeling is based on systematic analysis of how experienced instructors are able to attend to key crew behaviors and derive consistent CRM assessments in the complex simulator-based training environment. Concept sorting data, collected from recurrent training instructors, was subjected to hierarchical cluster analysis. The analysis identified the mental organization or knowledge structures required to make efficient CRM assessments in the time-constrained LOFT environment. There were three primary assessment clusters that experienced instructors had in common. These clusters of assessment concepts were used to develop the architecture and content of the assessor modules for the prototype CRM assessment expert system. That expert system provides an efficient CRM assessment that is similar to the process and output of the experienced recurrent training instructor. These findings have operational implications for the feasibility of an instructor CRM assessment tool and for making the CRM assessment process more systematic.


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