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Journal articles on the topic 'Helicopters – Design and construction – Estimates'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

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1

Cai, Guowei, Lin Feng, Ben M. Chen, and Tong H. Lee. "Systematic design methodology and construction of UAV helicopters." Mechatronics 18, no. 10 (2008): 545–58. http://dx.doi.org/10.1016/j.mechatronics.2008.05.011.

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2

Bisták, Andrej, and Zdenka Hulínová. "Construction of ropeways in Slovakia in terms of pre-construction design using helicopters (case study)." MATEC Web of Conferences 263 (2019): 01002. http://dx.doi.org/10.1051/matecconf/201926301002.

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Ropeways usually provide access to locations inaccessible to other means of transport. Due to this fact, the construction of ropeways is extraordinarily taxing in terms of both, technology and logistics. The site location is often in terrain difficult to access, which often precludes deployment of common construction mechanisms in ropeway construction. In such case, it is advisable to deploy a transport mechanism independent of the terrain – a helicopter. Functioning as “flying cranes“, the helicopters have been used in construction industry in Slovakia for six decades now. Having amassed posi

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3

Davidson, Gary, Tim Roberts, and Darren Savoye. "Skid Helicopters on High-Speed Craft." Journal of Ship Production 21, no. 02 (2005): 108–25. http://dx.doi.org/10.5957/jsp.2005.21.2.108.

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Helicopter decks are common throughout the commercial and military shipping industries and also the offshore industry. Construction in steel and aluminum is common. Helicopter decks on high-speed craft are not common. The first known helicopter deck installed on a high-speed craft was on an Incat wave-piercing catamaran, HSV X1, Joint Venture, which saw service during the recent Gulf war and is currently still in service with the US Army. Following successful construction and NAVAIR certification of Joint Venture, a more advanced aluminum deck, certified also by NAVAIR and Naval Sea Systems Co

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Peng, Chen, Bo Zhu, and Keqi Wei. "Design and Experimental Verification of Robust Motion Synchronization Control with Integral Action." Mathematical Problems in Engineering 2016 (2016): 1–14. http://dx.doi.org/10.1155/2016/7324508.

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A robust attitude motion synchronization problem is investigated for multiple 3-degrees-of-freedom (3-DOF) helicopters with input disturbances. The communication topology among the helicopters is modeled by a directed graph, and each helicopter can only access the angular position measurements of itself and its neighbors. The desired trajectories are generated online and not accessible to all helicopters. The problem is solved by embedding in each helicopter some finite-time convergent (FTC) estimators and a distributed controller with integral action. The FTC estimators generate the estimates

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KACHEL, Stanisław, Robert ROGÓLSKI, and Jakub KOCJAN. "Review of Modern Helicopter Constructions and an Outline of Rotorcraft Design Parameters." Problems of Mechatronics Armament Aviation Safety Engineering 12, no. 3 (2021): 27–52. http://dx.doi.org/10.5604/01.3001.0015.2427.

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This work contains the results of a modern helicopter construction analysis. It includes the comparison of almost seventy rotorcraft constructions in terms of size in line with EASA requirements – large and small helicopters. The helicopters are also divided because of a mission purpose. The proposed division for large aircrafts is: transport, multipurpose, attack and for small aircrafts: observation, training, and utility. The aircraft construction features are described. Average dimension values of airframes and rotors are shown. Helicopter rotor arrangements are presented in terms of an ope

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6

Balakchina, O., and V. Shalenny. "Design organization and construction implementation of the installation and reconstruction technology using helicopters." IOP Conference Series: Materials Science and Engineering 913 (September 12, 2020): 042039. http://dx.doi.org/10.1088/1757-899x/913/4/042039.

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7

Singh, Anvinder, and Varun Sharma. "DESIGN ANALYSIS AND CONSTRUCTION OF ENERGY HARVESTING COAXIAL HELICOPTER." Aviation 17, no. 4 (2013): 145–49. http://dx.doi.org/10.3846/16487788.2013.861230.

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With the growing need for technology, the tendency for errors has increased many times, which often results in loss of human lives. Our main aim of this paper is to show the implementation of a coaxial rotor aerial vehicle that can be controlled by a radio frequency transmitter. The helicopter is capable of manoeuvring in an area where real helicopters cannot. The area could be a flooded region, a place hit by an earthquake, or a building on fire. The main aim is to transmit video of that place to a base station by the camera attached to the helicopter. Various factors required to make a safe

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8

Szafran, Krzysztof, and Marcin Michalczyk. "Various Types of The Rotorcraft Design in the Context of Aerospace Regulations." Transactions on Aerospace Research 2018, no. 1 (2018): 146–53. http://dx.doi.org/10.2478/tar-2018-0010.

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Abstract In the next article on synthesis of regulations, the authors presented the general legal requirements for rotorcraft, which is limited to US regulations, because the vast majority of world regulations are based on them. The Institute of Aviation in Warsaw has developed requirements concerning the construction and operation of rotorcraft in Poland. These requirements constitute an important contribution to the regulations of the Civil Aviation Authority which are in force in the air space of the Republic of Poland. This paper presents the legal situation of rotorcraft and compares the

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9

Sverdlov, S. Z. "Estimation of the Time of Flight of an Electric Unmanned Helicopter Based on the Minimum Set of Parameters." Proceedings of Higher Educational Institutions. Маchine Building, no. 5 (710) (May 2019): 67–72. http://dx.doi.org/10.18698/0536-1044-2019-5-67-72.

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This article deals with the problem of forecasting the time of flight of an electric unmanned helicopter utilizing the minimum set of known parameters: the diameter and number of rotors and the flight mass. By solving this problem, it is possible to estimate the capabilities of an unmanned helicopter (multicopter), without having its full technical characteristics, which are often unavailable. In addition, when starting to design an aircraft, it is important to assess its key parameters necessary to achieve a given duration of flight, while preferably utilizing the minimum set of such paramete

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10

Lobão de Almeida, Thiago, and Victor Coracini Tonacio. "Passenger submarine concept design for oil production offshore systems." Ciencia y tecnología de buques 4, no. 8 (2011): 9. http://dx.doi.org/10.25043/19098642.42.

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The paper proposes an innovative solution to transport workers of offshore oil production platforms from the coast to their units, which operate at the Pre-Salt exploration, 300 km from the coast. A passenger submarine concept design was developed, justified by the range of practical obstacles observed in the current modes of transportation, helicopters and supply boats. Requirements like operational depth (100 m), passenger capacity (250 people), and cruising speed (minimum 13.4 knots) are defined, based on estimates. Firstly, it seeks the adoption of air-independent propulsion (AIP) systems,

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11

Kutt, Filip, Krzysztof Blecharz, and Dariusz Karkosiński. "Axial-Flux Permanent-Magnet Dual-Rotor Generator for a Counter-Rotating Wind Turbine." Energies 13, no. 11 (2020): 2833. http://dx.doi.org/10.3390/en13112833.

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Coaxial counter-rotating propellers have been widely applied in ships and helicopters for improving the propulsion efficiency and offsetting system reactive torques. Lately, the counter-rotating concept has been introduced into the wind turbine design. Distributed wind power generation systems often require a novel approach in generator design. In this paper, prototype development of axial-flux generator with a counter-rotating field and armature is presented. The design process was composed of three main steps: analytical calculation, FEM simulation and prototype experimental measurements. Th

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12

El-Kassaby, Y. A., M. U. Stoehr, D. Reid, C. G. Walsh, and T. E. Lee. "Clonal-row versus random seed orchard designs: interior spruce mating system evaluation." Canadian Journal of Forest Research 37, no. 3 (2007): 690–96. http://dx.doi.org/10.1139/x06-248.

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Mating system pattern (selfing or outcrossing and correlated matings levels) comparisons between two interior spruce seed orchard designs (clonal-row and random) managed under intensive crown and pollen management were conducted. Crown manipulation consisted of tree topping and branch pruning, while pollen management involved multiple supplemental mass-pollination applications during peak seed-cone reproductive receptivity and pollen agitation using helicopters. Significant differences between orchards’ multilocus outcrossing rate estimates were observed, and both estimates significantly depar

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Holmes, Thomas P., and David E. Calkin. "Econometric analysis of fire suppression production functions for large wildland fires." International Journal of Wildland Fire 22, no. 2 (2013): 246. http://dx.doi.org/10.1071/wf11098.

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In this paper, we use operational data collected for large wildland fires to estimate the parameters of economic production functions that relate the rate of fireline construction with the level of fire suppression inputs (handcrews, dozers, engines and helicopters). These parameter estimates are then used to evaluate whether the productivity of fire suppression inputs during extensive fire suppression efforts are similar to productivity estimates derived from direct observation and used as standard rates by the US Forest Service. The results indicated that the production rates estimated with

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14

Wang, Xiangyu, Ling Han, and Jiyu Liu. "Attitude and height tracking control of unmanned helicopters with disturbances via disturbance observer-based composite dynamic surface control." Transactions of the Institute of Measurement and Control 43, no. 14 (2021): 3294–307. http://dx.doi.org/10.1177/01423312211023227.

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In this paper, the attitude and height tracking control problem is studied for unmanned helicopters with disturbances. To solve the problem, a composite control scheme is proposed based on the combination of dynamic surface control and disturbance observer-based control techniques. The control design includes two parts. In the first part, some nonlinear disturbance observers are designed to accurately estimate the helicopter’s disturbances in different channels. In the second part, based on the disturbance estimates and dynamic surface control technique, a composite dynamic surface tracking co

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15

Dowrick, David J. "Seismic hazard estimates for the Auckland area, and their design and construction implications." Bulletin of the New Zealand Society for Earthquake Engineering 25, no. 3 (1992): 211–21. http://dx.doi.org/10.5459/bnzsee.25.3.211-221.

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Revised estimates of the return periods of Modified Mercalli (MM) intensity for Auckland and Northland, arising from a revision of the attenuation of intensity in New Zealand, and latest data and views on the local seismicity and geology, represent considerable reductions in the hazard given in Smith and Berryman's seismic hazard model of New Zealand. The revised levels are MM6 and MM7 for 150 and 1200 year return periods. This implies that most structures and plant in Auckland and Northland could have much simpler and less onerous earthquake resistant design and construction than required by

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16

AbouRizk, S. M., G. M. Babey, and G. Karumanasseri. "Estimating the cost of capital projects: an empirical study of accuracy levels for municipal government projects." Canadian Journal of Civil Engineering 29, no. 5 (2002): 653–61. http://dx.doi.org/10.1139/l02-046.

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This paper highlights the findings of a study undertaken to assess the accuracy of cost estimates for construction projects at various levels of design maturity. Specifically, this paper addresses the accuracy of cost estimates for major types of municipal works including drainage, roadways, and building projects over a span of 3 years. Over 200 projects were statistically evaluated in the study at four levels of the design, namely, concept, preliminary, detailed, and award. Those estimates were then compared with actual incurred cost at project completion. In general, it was found that estima

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17

Dube, Deepali Y., and Hiren G. Patel. "Suppressing the Noise in Measured Signals for the Control of Helicopters." Fluctuation and Noise Letters 18, no. 01 (2019): 1950002. http://dx.doi.org/10.1142/s0219477519500020.

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This paper concerns with the non-linear system having multiple-inputs multiple-outputs (MIMO). The plant mainly comprises: bench-top helicopter, tail and main rotor of a helicopter system. The dynamics are presented with control methodologies where a conventional strategy proves the instability of the system while the deadbeat and sliding mode control with linear matrix inequality regulates the future estimates. There have been disturbances like presence of unwanted ripples in the output of the non-linear systems (in case of stability also after 100[Formula: see text]s) and in the tracking of

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18

Kim, Hak-Joon, Z. Eisenstein, Byung-Gon Chae, and Chan-Ho Jeong. "Estimates of stress reduction factors for the tunnel design." Tunnelling and Underground Space Technology 21, no. 3-4 (2006): 451. http://dx.doi.org/10.1016/j.tust.2005.12.089.

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19

Dandan, Tala Hassan, Ghaleb Sweis, Lilana Salem Sukkari, and Rateb J. Sweis. "Factors affecting the accuracy of cost estimate during various design stages." Journal of Engineering, Design and Technology 18, no. 4 (2019): 787–819. http://dx.doi.org/10.1108/jedt-08-2019-0202.

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Purpose The purpose of this paper is to identify factors affecting cost estimate accuracy in each of five design stages preceding building construction: order of magnitude, conceptual/schematic, detailed design, construction document and bid phase. Design/methodology/approach Data were collected using an online survey completed by 138 respondents who work in design consultancy firms in Jordan, including project managers, architects and quantity surveyors (QSs). Survey responses were analyzed using descriptive statistics. Confirmatory interviews and case study comparisons were used to confirm t

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20

Wright, David G., Gilles G. Patry, Charles E. Letman, and Donald R. Woods. "A procedure for estimating the capital cost of Ontario wastewater treatment plant using CAPDET." Canadian Journal of Civil Engineering 15, no. 5 (1988): 799–806. http://dx.doi.org/10.1139/l88-104.

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CAPDET is a computer-assisted procedure for the design and evaluation of wastewater treatment facilities developed by the U.S. Army Corps of Engineers and the U.S. Environmental Protection Agency. The purpose of this study was to develop a procedure for applying CAPDET to the capital cost estimation of Canadian wastewater treatment plants without altering the source code. The proposed methodology is simple and efficient, requiring no additional data to that normally used in CAPDET.A total of 10 Canadian wastewater treatment plants were studied which included many of the treatment processes use

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21

Zhang, Bing, and Xiao Mou Wang. "Yield Design of the Reinforced Embankment." Advanced Materials Research 368-373 (October 2011): 2804–7. http://dx.doi.org/10.4028/www.scientific.net/amr.368-373.2804.

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A frequently used technique for improving the performance of geotechnical structures consists in incorporating into the backfill soil, during the construction process, regularly spaced thin reinforcing inclusions, called geotextile, geomembranes or geogrids. The stability of embankment, stabilized by reinforcing membranes, is investigated by means of a multiphase model developed in the framework of the yield design approach. By means of the kinematic approach, leading to upper bound estimates for the stability factor of the structure.

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22

Abdullayev, A. "Role of Micro-Entrepreneurship in Construction Industry." Bulletin of Science and Practice 5, no. 4 (2019): 342–47. http://dx.doi.org/10.33619/2414-2948/41/48.

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The generally accepted view of the functions of a small business as a social institution that supports the competitive environment, employment and adaptive factors of the economy: a particular lifestyle, class. A manifestation of small business opportunities in the Soviet period of development was the cooperative sector of the economy, in many of the proposed modern enterprise formats. At the same time, small business is actively developing in the investment and construction sector in a highly qualified segment in the provision of accounting services, project management, design, estimates, and

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23

Akinradewo, Opeoluwa Israel, Clinton Ohis Aigbavboa, and Ayodeji Emmanuel Oke. "Improving accuracy of road projects’ estimates in the Ghanaian construction industry." Journal of Financial Management of Property and Construction 25, no. 3 (2020): 407–21. http://dx.doi.org/10.1108/jfmpc-11-2019-0087.

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Purpose The inaccuracy of preliminary estimates sometimes results in wasted development effort if the project is abandoned. To curb this menace, this study aims to assess the different measures to improve the accuracy of road project estimates. Design/methodology/approach Quantitative research design was used for this study, and questionnaire was designed to retrieve data from the target population. Engineers and quantity surveyors in Accra, Ghana formed the target population and were contacted by using an e-questionnaire through their professional bodies owing to location constraints. Descrip

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24

Topchiy, Dmitry, and Marina Katasonova. "Audit of design estimates and organizational and technological documentation in the process of construction expertise." MATEC Web of Conferences 251 (2018): 05036. http://dx.doi.org/10.1051/matecconf/201825105036.

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This article examines the problem of insufficient determination of the requirements for admissions, qualifications of experts and experts in the field of expertise and audit of construction, reconstruction and re-profiling. The place and role of expertise in construction, the prerequisites and the grounds for its conduct are analyzed. The necessity to expand and specify the legislative platform on the basis of which judicial expert and technical activity is conducted has been revealed and substantiated. On the basis of the conducted research using empirical data, a minimal enough link of the e

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25

Picanço Cruz, Eduardo, Carlos Navarro Fontanillas, Karen Possoli, and Martius Vicente Rodriguez y Rodriguez. "Association of Borda's method and analytic hierarchy process (AHP) for the acquisition of helicopters by the Brazilian Navy." Revista Gestão da Produção Operações e Sistemas 15, no. 4 (2020): 23–47. http://dx.doi.org/10.15675/gepros.v15i4.2432.

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Purpose – A combination of the Analytic Hierarchy Process (AHP) and the Borda’s Method as a suggestion for collective decision-making. By harmonizing the cardinal scale, resulting from the AHP, with the Borda’s Method, it is expected that the evaluations of the alternatives for new helicopters maximize the individual opinions in the construction of a collective decision. Design/methodology/approach – Qualitative and quantitative. The agents involved in the project of acquisition of helicopters for General Usage and Small Capacity for the Brazilian Navy were interviewed, ten pilots and six mili

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26

Hamidullin, R. I., and L. B. Senkevich. "ABOUT NECESSITY OF MATHEMATICAL MODELING OF THE BUSINESS PROCESS OF COST ESTIMATE CALCULATIONS IN THE CONSTRUCTION OF OIL AND GAS FACILITIES." Oil and Gas Studies, no. 6 (December 1, 2017): 139–45. http://dx.doi.org/10.31660/0445-0108-2017-6-139-145.

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A study of the quality of the development of estimate documentation on the cost of construction at all stages of the implementation of large projects in the oil and gas industry is conducted. The main problems that arise in construction organizations are indicated. The analysis of the choice of the perfect methodology of mathematical modeling of the investigated business process for improving the activity of budget calculations, conducting quality assessment of estimates and criteria for automation of design estimates is performed.

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27

Moyst, Howard, and Biman Das. "A Linear Programming Approach to Optimization of Ship Design and Construction Phases." Journal of Ship Production 24, no. 01 (2008): 1–6. http://dx.doi.org/10.5957/jsp.2008.24.1.1.

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Labor cost savings can be obtained by considering the effect of design rework on the degree of overlap of the ship design and construction phases. Based on data from a shipbuilding case study, a linear programming (LP) model was developed to investigate the optimum overlap of the design and construction phases. Two scenarios were modeled. The case study's start-up period, which involved design and the construction of four ships, and a hypothetical small batch program to determine the degree of overlap and total hours required for a new shipbuilding program. In each scenario, the LP model found

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28

Dang, Chau Ngoc, and Long Le-Hoai. "Revisiting storey enclosure method for early estimation of structural building construction cost." Engineering, Construction and Architectural Management 25, no. 7 (2018): 877–95. http://dx.doi.org/10.1108/ecam-07-2015-0111.

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Purpose The purpose of this paper is to develop several predictive models for estimating the structural construction cost and establish range estimation for the structural construction cost using design information available in early stages of residential building projects. Design/methodology/approach Information about residential building projects is collected based on project documents from construction companies with regard to the design parameters and the actual structural construction costs at completion. Storey enclosure method (SEM) is fundamental for determining the building design par

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Baecher, Gregory B., and Charles C. Ladd. "Formal Observational Approach to Staged Loading." Transportation Research Record: Journal of the Transportation Research Board 1582, no. 1 (1997): 49–52. http://dx.doi.org/10.3141/1582-08.

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Construction of a major industrial facility on soft clay was accomplished by staged loading to consolidate and thus increase the strength of foundation soils before the complete final load was applied. Extensive in situ and laboratory testing allowed a formal observational approach to be used, in which uncertainty analysis of the preliminary design was combined with field monitoring data to update soil parameter and site condition estimates. Traditional Bayesian methods were used to modify initial estimates and thus to update predictions of facility performance in the later stages of construct

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30

Kłysz, Sylwester. "Transformation Of The S-N Curves For Al 2024 Alloy." Journal of KONBiN 32, no. 1 (2014): 19–36. http://dx.doi.org/10.2478/jok-2014-0028.

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Abstract The article compared the results of high cycle fatigue tests in samples of aluminum alloy 2024-T4, which is used in aircraft construction, especially for highly loaded structural elements, including for plating and fuselage frames and girders rotor blades of helicopters - with results available in the literature. The tests were performed on cylindrical samples, of a parallel and perpendicular orientation relative to the "direction of embodiment" or the rolling direction of the blank sheet metal with a coefficient of asymmetry cycle R = −1. Material for the study was collected from the

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31

Hern�ndez-Montes, E., and M. Aschleim. "Estimates of the yield curvature for design of reinforced concrete columns." Magazine of Concrete Research 55, no. 4 (2003): 373–83. http://dx.doi.org/10.1680/macr.55.4.373.37581.

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Lim, Brendon, Madhav P. Nepal, Martin Skitmore, and Bo Xiong. "Drivers of the accuracy of developers’ early stage cost estimates in residential construction." Journal of Financial Management of Property and Construction 21, no. 1 (2016): 4–20. http://dx.doi.org/10.1108/jfmpc-01-2015-0002.

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Purpose – Preliminary cost estimates for construction projects are often the basis of financial feasibility and budgeting decisions in the early stages of planning and for effective project control, monitoring and execution. The purpose of this paper is to identify and better understand the cost drivers and factors that contribute to the accuracy of estimates in residential construction projects from the developers’ perspective. Design/methodology/approach – The paper uses a literature review to determine the drivers that affect the accuracy of developers’ early stage cost estimates and the fa

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Zhu, Li, Wen Shan Lian, and Fei Wang. "BIM Digital Technology in the Construction Industry in the Field of Application." Advanced Materials Research 143-144 (October 2010): 1375–79. http://dx.doi.org/10.4028/www.scientific.net/amr.143-144.1375.

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Design is a philosophy, is a building integrated system database, It is an emerging form of construction industry, but BIM itself on case also is not a new concept for most people the knowledge, BIM is not only breaking two-dimensional to three-dimensional design development, with more than a four-dimensional space, with integrated database concept, the engineering quantity estimates, forecasts, integrated management and construction progress and ranking logistics integration in promoting green building and energy conservation and pollution reduction has made outstanding contributions to great

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Gaikwad, Suraj V., Maria Calahorra-Jimenez, Keith R. Molenaar, and Cristina Torres-Machi. "Challenges in Engineering Estimates for Best Value Design–Build Highway Projects." Journal of Construction Engineering and Management 147, no. 7 (2021): 04021065. http://dx.doi.org/10.1061/(asce)co.1943-7862.0002104.

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Peshkov, A. V. "Construction 4.0: immaterial assets types in the development of design estimates for effective digitalization of building projects." IOP Conference Series: Earth and Environmental Science 751, no. 1 (2021): 012107. http://dx.doi.org/10.1088/1755-1315/751/1/012107.

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Soldatkin, V. M., V. V. Soldatkin, A. V. Nikitin, and E. O. Ariskin. "Measuring System of Air Parameters of the Helicopter with a Stationary Receiver a Flow, Ion-Label and Aerometric Measurement Channels." Mekhatronika, Avtomatizatsiya, Upravlenie 19, no. 11 (2018): 744–52. http://dx.doi.org/10.17587/mau.19.744-752.

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It is shown that the known limitations on the measurement of air parameters on board the helicopter due to significant aerodynamic disturbances introduced by inductive flows of vortex column of main rotor. This determines the need to create the means of measurement, taking into account the aerodynamics and dynamics of the helicopter flight. The known direction of overcoming these limitations is the use for measuring the information of aerodynamic field of vortex column of main rotor and its perception by means of the stationary multi-functional aerometric receiver. However, the need to protect

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Soldatkin, V. M., and V. V. Soldatkin. "Research of Methodological Errors of the Air Data System of Aircraft with Stationary Included Receiver of Incoming Air Flow." Mekhatronika, Avtomatizatsiya, Upravlenie 20, no. 8 (2019): 504–12. http://dx.doi.org/10.17587/mau.20.504-512.

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It is shown that the known limitations on the measurement of air parameters on board the helicopter due to significant aerodynamic disturbances introduced by inductive flows of vortex column of main rotor. This determines the need to create the means of measurement, taking into account the aerodynamics and dynamics of the helicopter flight. The known direction of overcoming these limitations is the use for measuring the information of aerodynamic field of vortex column of main rotor and its perception by means of the stationary multi-functional aerometric receiver. However, the need to protect

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Mwafy, Aman, Amr Elnashai, and W. H. Yen. "Implications of Design Assumptions on Capacity Estimates and Demand Predictions of Multispan Curved Bridges." Journal of Bridge Engineering 12, no. 6 (2007): 710–26. http://dx.doi.org/10.1061/(asce)1084-0702(2007)12:6(710).

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Minnullina, Anna, Ruslan Minnullin, Elena Savoskina, and Tatyana Shatalova. "Economic rationale for the option of connecting reinforcing bars in the construction." E3S Web of Conferences 164 (2020): 09024. http://dx.doi.org/10.1051/e3sconf/202016409024.

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The article proposes methodology for economic feasibility of choosing the option of joining reinforcing steel when installing supporting structures based on a comparative approach. To confirm the practical applicability of the proposed recommendations, a study was conducted at a large construction company operating in the Tyumen region in Russia. The obtained results confirmed the applied nature of the proposed recommendations at the design stage of the analyzed construction object and preparation of local estimates.

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Kumar Singla, Harish. "A comparative analysis of long-term performance of construction and non-construction IPOs in India." Engineering, Construction and Architectural Management 26, no. 10 (2019): 2447–73. http://dx.doi.org/10.1108/ecam-01-2019-0009.

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Purpose The purpose of this paper is to analyze the long-term performance of construction sector initial public offers (IPO) made in India during 2006–2015. The study aims to compare the performance of the construction sector IPOs with the non-construction sector IPOs and finds the determinants of long-term performance of construction sector IPO with a time horizon of three years. The study also attempts to find out, if the long-term IPO underpricing that has been discussed in the literature, really exists or it is a myth. Design/methodology/approach The study uses data of IPOs listed on Natio

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Lindsay, R., and A. Schweiger. "Arctic sea ice thickness loss determined using subsurface, aircraft, and satellite observations." Cryosphere 9, no. 1 (2015): 269–83. http://dx.doi.org/10.5194/tc-9-269-2015.

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Abstract. Sea ice thickness is a fundamental climate state variable that provides an integrated measure of changes in the high-latitude energy balance. However, observations of mean ice thickness have been sparse in time and space, making the construction of observation-based time series difficult. Moreover, different groups use a variety of methods and processing procedures to measure ice thickness, and each observational source likely has different and poorly characterized measurement and sampling errors. Observational sources used in this study include upward-looking sonars mounted on subma

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Lindsay, R., and A. Schweiger. "Arctic sea ice thickness loss determined using subsurface, aircraft, and satellite observations." Cryosphere Discussions 8, no. 4 (2014): 4545–80. http://dx.doi.org/10.5194/tcd-8-4545-2014.

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Abstract. Sea ice thickness is a fundamental climate state variable that provides an integrated measure of changes in the high-latitude energy balance. However, observations of ice thickness have been sparse in time and space making the construction of observation-based time series difficult. Moreover, different groups use a variety of methods and processing procedures to measure ice thickness and each observational source likely has different and poorly characterized measurement and sampling biases. Observational sources include upward looking sonars mounted on submarines or moorings, electro

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Oo, Bee Lan, Florence Yean Yng Ling, and Alexander Soo. "Construction Procurement: Modelling Bidders’ Learning in Recurrent Bidding." Construction Economics and Building 15, no. 4 (2015): 16–29. http://dx.doi.org/10.5130/ajceb.v15i4.4653.

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Construction remains a significant area of public expenditure. An understanding of the process of changes in construction pricing, and how the process can be manipulated through the release of bidding feedback information is vital, in order to best design clients’ procurement policies. This paper aims to statistically model inexperienced individual bidders’ learning in recurrent bidding under partial and full information feedback conditions. Using an experimental dataset, the developed linear mixed model contains three predictor variables, namely: time factor, information feedback conditions,

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Fragkakis, Nikolaos, Sergios Lambropoulos, and John-Paris Pantouvakis. "A Computer-Aided Conceptual Cost Estimating System for Pre-Stressed Concrete Road Bridges." International Journal of Information Technology Project Management 5, no. 1 (2014): 1–13. http://dx.doi.org/10.4018/ijitpm.2014010101.

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The need for an environmentally friendly design of modern motorways increases the construction of bridges, which has exhibited substantial overruns above estimated costs. Therefore, easy to use, inexpensive and accurate methods for conceptual cost estimating are needed. This paper presents a computer-aided cost estimating system for pre-stressed concrete road bridges that provides estimates of the material quantities and cost of all bridge elements. It relies on a database incorporating actual data collected from recently constructed bridges and exploits material estimating models developed wi

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Kutyrin, Boris, and Yuri Elkin. "ASSESSMENT OF NOISE AND ELECTROMAGNETIC EFFECTS OF TRAFFIC FLOW ON RESIDENTIAL BUILDINGS AT THE DESIGN, CONSTRUCTION AND EXPLOITATION OF ACOUSTIC SCREENS." Akustika 34 (November 1, 2019): 107–12. http://dx.doi.org/10.36336/akustika201934107.

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The main purpose of this paper is to study the causes and development of estimation procedure, as well as forecasting of an increase of traffic stream noise and electromagnetic action on residential buildings due to reduction in the efficiency of panels during their life cycle. Field observation which confirmed a sufficient similarity of the dynamics of reducing the acoustic panel efficiency with the procedure estimates were carried out in the process. The article also estimates risks of accidents and forecasting of cost increases that negatively affect the efficiency of AP. Recommendations fo

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Gupta, Deepak K., and Anoop K. Dhingra. "Load Reconstruction Technique UsingD-Optimal Design and Markov Parameters." Shock and Vibration 2015 (2015): 1–9. http://dx.doi.org/10.1155/2015/605695.

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This paper develops a technique for identifying dynamic loads acting on a structure based on impulse response of the structure, also referred to as the system Markov parameters, and structure response measured at optimally placed sensors on the structure. Inverse Markov parameters are computed from the forward Markov parameters using a linear prediction algorithm and have the roles of input and output reversed. The applied loads are then reconstructed by convolving the inverse Markov parameters with the system response to the loads measured at optimal locations on the structure. The structure

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Jansson, P., and C. G. Persson. "The effect of correlation on uncertainty estimates – with GPS examples." Journal of Geodetic Science 3, no. 2 (2013): 111–20. http://dx.doi.org/10.2478/jogs-2013-0016.

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Abstract This article deals with the effect of correlation on the estimates of measurement uncertainty, with some focus on Global Positioning Satellite (GPS) time series analysis. Analytical derivations and Monte Carlo simulations form the theoretical basis, which shows that uncompensated correlation produces unrealistic uncertainty estimates. Tools for handling correlation in connection with estimation of uncertainty, construction of confidence intervals, hypothesis testing, design of measurement strategies, and development of tolerances are outlined and demonstrated. The GPS observation time

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Xu, Long Jun, and Hong Zhi Zhang. "The Uncertainty in Shape Parameter Predictions of Seismic Design Spectra for Nuclear Power Plant." Applied Mechanics and Materials 405-408 (September 2013): 2025–29. http://dx.doi.org/10.4028/www.scientific.net/amm.405-408.2025.

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Aiming at the uncertainty of design spectrum raised by the construction methods, a comparative study is conducted in which different methodologies performed calculations of seismic response spectra using the same set of ground motion data from recent large earthquakes. The results of the research allowed some estimates to be made of the scaling method and model uncertainty involved in these calculations. These results were compared with the uncertainty derived from the proposed spectrum of a double-parameter-based bi-normalized response spectrum (DPBNS) approach. It is concluded that the sourc

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Гребеников, А. Г., И. А. Воронько, Ю. В. Дьяченко та ін. "КОНСТРУКТИВНО-ТЕХНОЛОГІЧНІ ОСОБЛИВОСТІ МЕТАЛЕВИХ ЛОПАТЕЙ НЕСУЧОГО І РУЛЬОВОГО ГВИНТІВ ВЕРТОЛЬОТА". Open Information and Computer Integrated Technologies, № 87 (30 червня 2020): 5–51. http://dx.doi.org/10.32620/oikit.2020.87.01.

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Analysis of the foreign and domestic work experience, manufacturing and operation of the helicopters with metal blades of the main (MR) and tail (TR) rotors is performed. General requirements for the helicopter MR and TR blades design are formulated. Structural arrangement of the helicopter MR metal blade is reviewed, features of the construction materials for the metal blades are noted. Features of the MR and TR metal blades design with the pressed spar and aluminum honeycomb core are given. Parametric modeling technique of the helicopter MR metal blade is presented. The manufacturing rout te

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Van, Sang Quang, Long Le-Hoai, and Chau Ngoc Dang. "Predicting implementation cost contingencies for residential construction projects in flood-prone areas." International Journal of Managing Projects in Business 12, no. 4 (2019): 1097–119. http://dx.doi.org/10.1108/ijmpb-04-2018-0071.

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Purpose The purpose of this paper is to predict implementation cost contingencies for residential construction projects in flood-prone areas, where floods with storms frequently cause serious damage and problems for people. Design/methodology/approach Expert interviews are conducted to identify the study variables. Based on bills of quantities and project documents, historical data on residential construction projects in flood-prone areas are collected. Pearson correlation analysis is first used to check the correlations among the study variables. To overcome multicollinearity, principal compo

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