scholarly journals THE IMPROVING OF THE ACCURACY OF ENGINEERING AND GEODETIC WORKS IN THE CONSTRUCTION AND CONTROL OF THE GEOMETRIC PARAMETERS OF HIGH-RISE BUILDINGS

2020 ◽  
Vol 6 (444) ◽  
pp. 162-168
Author(s):  
T. M. Malik ◽  
◽  
V. G. Burachek ◽  
Ya. P. Bryk ◽  
S. D. Kryachok ◽  
...  
Keyword(s):  
High Accuracy ◽  
Measurement Precision ◽  
Geometric Parameters ◽  
Distance Measurements ◽  
Engineering Structures ◽  
High Rise ◽  
Double Frequency ◽  
Geodetic Coordinates ◽  
The Moment ◽  
And Control

. In the article, the authors had done a brief analysis of existing modern, traditional methods and tools that allow to determine the planned coordinates of geodetic signs, located on the last tier of super-high engineering structures, paid special attention to the disadvantages and concluded that it’s necessary to develop a method and device for determining the geodetic coordinates on ultra-high engineering structures with high accuracy to provide engineering and geodetic works during the construction and operation of high-rise structures. In the article, the authors propose their method and device for determining the planar coordinates of the upper geodetic sign of the line of vertical design on ultra-high engineering structures with high accuracy, which is based on the method of the straight linear resection by the light distance meter. The result of the proposed method is the enhancing of the accuracy of engineering and geodetic works during the construction and control of geometric parameters of high-rise structures. This method of distance measurements allows getting the enhancing of the accuracy of the engineering and geodetic measurements by fixing the moment of occurrence of the double frequency with root mean square error (RMSE) above 0.5 mm, thus eliminating the need to measure the phase difference between direct and reflected pulses. A particular advantage of the proposed method is that the accuracy of the measurements depends on the comparison of the radiated f and double fg frequencies, which makes the measurement precision.

Using side-point method for increasing the accuracy of surveying network at monitoring engineering structures

2020 ◽  
Vol 965 (11) ◽  
pp. 2-8
Author(s):  
N.V. Kanashin
Keyword(s):  
High Accuracy ◽  
Measurement Precision ◽  
Point Method ◽  
World Cup ◽  
Engineering Structures ◽  
Total Station ◽  
Structure Deformation ◽  
Accuracy Of Measurements ◽  
The World ◽  
High Measurement

Geodetic monitoring buildings and structures is a complex and critical task nowadays, that requires high accuracy of measurements. Various methods are used to obtain it when working on various structures. The author describes the technology of using the side-point method to increase the accuracy of creating a surveying network when monitoring stadiums for the World Cup 2018. It is shown that the application of the aforementioned method together with the well-known one of dead distances measuring with total station does not significantly increase the complexity of the work, but provides high measurement precision even under adverse observation conditions. The features of adjusting such measurements are set out in the article. It is also experimentally established that using the side-points method enables increasing the accuracy of measurements by 1,5–2 times when constructing polygonometric traverses. The article may be useful for at specialists monitoring and geodetic control of structure deformation.

MANUFACTURE INVESTIGATION OF CARTRIDGE WITH BOTTOM-MOST PART FLANGE BY DIRECT EXTRUSION WITH COUNTERPUNCH. REPORT 18. EXPERIMENTAL CHECK OF THEORETICAL RESULTS FOR DIFFERENT HOLLOW RADIUSES AND BOTTOM-MOST PART THICKNESSES

2020 ◽  
Vol 0 (9) ◽  
pp. 16-23
Author(s):  
A. L. Vorontsov ◽  
◽  
I. A. Nikiforov ◽  
Keyword(s):  
Strain Hardening ◽  
Theoretical Calculations ◽  
High Accuracy ◽  
Geometric Parameters ◽  
Strength Characteristics ◽  
Experimental Check ◽  
Hardening Material ◽  
Direct Extrusion ◽  
Theoretical Results

The results of an experimental check of the obtained theoretical formulae allowing us to determine the most important parameters of extrusion cartridges with a counterpunch for different hollow radiuses and bottom-most part thicknesses are presented. Characteristics of used tools, geometric parameters of extrusion experiments, strength characteristics of deformed materials and lubricants are described in detail. Both strain-hardening material and strain-unhardening material were studied. Methodology of the theoretical calculations is demonstrated in detail. High accuracy of the obtained design formulae was confirmed.

Automated sequencing batch bioreactor under extreme peaks of 4-chlorophenol

2003 ◽  
Vol 47 (10) ◽  
pp. 175-181 ◽  
Author(s):  
G. Buitrón ◽  
M.-E. Schoeb ◽  
J. Moreno
Keyword(s):  
Dissolved Oxygen ◽  
Metabolic Activity ◽  
Automated System ◽  
Stable Operation ◽  
High Concentration ◽  
Batch Bioreactor ◽  
On Line ◽  
The Moment ◽  
And Control ◽  
System Operating

The operation of a sequencing batch bioreactor is evaluated when high concentration peaks of a toxic compound (4-chlorophenol, 4CP) are introduced into the reactor. A control strategy based on the dissolved oxygen concentration, measured on line, is utilized. To detect the end of the reaction period, the automated system search for the moment when the dissolved oxygen has passed by a minimum, as a consequence of the metabolic activity of the microorganisms and right after to a maximum due to the saturation of the water (similar to the self-cycling fermentation, SCF, strategy). The dissolved oxygen signal was sent to a personal computer via data acquisition and control using MATLAB and the SIMULINK package. The system operating under the automated strategy presented a stable operation when the acclimated microorganisms (to an initial concentration of 350 mg 4CP/L), were exposed to a punctual concentration peaks of 600 mg 4CP/L. The 4CP concentrations peaks superior or equals to 1,050 mg/L only disturbed the system from a short to a medium term (one month). The 1,400 mg/L peak caused a shutdown in the metabolic activity of the microorganisms that led to the reactor failure. The biomass acclimated with the SCF strategy can partially support the variations of the toxic influent since, at the moment in which the influent become inhibitory, there is a failure of the system.

Engineering Planning and Management Control in High-Rise Building Construction

2012 ◽  
Vol 193-194 ◽  
pp. 1257-1260
Author(s):  
Min Zhang
Keyword(s):  
Management Control ◽  
Building Construction ◽  
Construction Process ◽  
High Rise ◽  
High Rise Building ◽  
Planning And Control ◽  
Flexible Modeling ◽  
Planning And Management ◽  
And Control ◽  
Different Levels

Various challenges should be considered in the development of an effective model for the planning and control of high-rise building construction. These challenges have been identified as results of the construction process. This paper discusses the engineering planning and management control in high-rise building construction. The methodology should also be able to address the concerns and considerations regularly faced in the industry and thus providing flexible modeling, which can be used by different levels of management

Design and Analysis of Reduced Degree of Freedom Modular Snake Robot

2017 ◽  
Author(s):  
Peter Racioppo ◽  
Wael Saab ◽  
Pinhas Ben-Tzvi
Keyword(s):  
Three Dimensional ◽  
Cross Sectional ◽  
Design Synthesis ◽  
Snake Robot ◽  
Routing Schemes ◽  
Revolute Joints ◽  
Modular Units ◽  
A Chain ◽  
The Moment ◽  
And Control

This paper presents the design and analysis of an underactuated, cable driven mechanism for use in a modular robotic snake. The proposed mechanism is composed of a chain of rigid links that rotate on parallel revolute joints and are actuated by antagonistic cable pairs and a multi-radius pulley. This design aims to minimize the cross sectional area of cable actuated robotic snakes and eliminate undesirable nonlinearities in cable displacements. A distinctive feature of this underactuated mechanism is that it allows planar serpentine locomotion to be accomplished with only two modular units, improving the snake’s ability to conform to desired curvature profiles and minimizing the control complexity involved in snake locomotion. First, the detailed mechanism and cable routing scheme are presented, after which the kinematics and dynamics of the system are derived and a comparative analysis of cable routing schemes is performed, to assist with design synthesis and control. The moment of inertia of the mechanism is modeled, for future use in the implementation of three-dimensional modes of snake motion. Finally, a planar locomotion strategy for snake robots is devised, demonstrated in simulation, and compared with previous studies.

scholarly journals Praca, robotnicy, archiwa, fotografia — utrwalanie stereotypów i walka o emancypację

2015 ◽  
Vol 59 (3) ◽  
pp. 203-221
Author(s):  
Tomasz Ferenc
Keyword(s):  
Historical Perspective ◽  
Methodological Problem ◽  
Digital Repository ◽  
The Third ◽  
Working People ◽  
Soviet Russia ◽  
The Moment ◽  
And Control ◽  
The 19Th Century ◽  
Scientific Tool

Work, workers, and workers’ living conditions quickly became a field of interest for photographers. Already by the middle of the 19th century there were photographs showing working people. Nevertheless, the contexts in which such photographs were taken varied considerably. The first part of this article presents, in the historical perspective, the different causes and strategies involved in making these types of documents, up to the moment when photographs began to appear that had been made by workers themselves. The movement to photograph workers, which developed in the first decades of the 20th century, is recalled in the second part of the article (using the examples of the Weimar Republic and Soviet Russia). The third part is devoted to photographic projects whose purpose was to increase the productivity of, and control over, workers. Photography is presented as a scientific tool for measuring movement and as an illustration of the most effective manners of organizing work. At the end, the Digital Repository of Worker Photography is described, as an example of work on a collection of photos and the creation of a platform permitting further work, but also as a legal and methodological problem.

The effect of vertical near-field ground motions on the collapse risk of high-rise reinforced concrete frame-core wall structures

2021 ◽  
pp. 136943322110561
Author(s):  
Arsam Taslimi ◽  
Mohsen Tehranizadeh
Keyword(s):  
Reinforced Concrete ◽  
Seismic Performance ◽  
Fragility Curves ◽  
Ground Motions ◽  
Reinforced Concrete Frame ◽  
Engineering Structures ◽  
Intensity Measures ◽  
Vertical Excitation ◽  
High Rise ◽  
Wall Structures

According to the observations of past earthquakes, the vertical ground motions have had a striking influence on the engineering structures, especially reinforced concrete ones. Nevertheless, the number of studies on their aftermath is insufficient, and despite some endeavors done by researchers, there is still a shortage of knowledge about the inclusion of vertical excitation on the seismic performance and the collapse probability of RC buildings. Hence, the variation in the collapse risk of three high-rise RC frame-core wall structures when they undergo bi-directional ground motions is discussed. In this paper, incremental dynamic analyses are carried out under two circumstances, including the horizontal (H) and the combined horizontal and vertical (H+V) earthquakes, and the seismic fragility curves are derived. The inter-story drift ratio corresponding to the onset of collapse has also been defined. The buildings collapse risk under the two circumstances is obtained from the risk integral. Results indicate that in the H+V state, structures meet the collapse criteria for lower intensity measures. Thus, the collapse risk increases as the structures are subjected to bi-directional seismic loads, and the consideration of this effect leads to a more accurate evaluation of buildings seismic performance.

Telemetri Flowmeter Menggunakan RF Modul 433MHz

2017 ◽  
Vol 1 (1) ◽  
pp. 8
Author(s):  
Frima Setyawan Nur Rohman ◽  
Ahmadan Ainul Fikri ◽  
Ahmad nur Fuad ◽  
Rahmat Rohim ◽  
Rifki Firmansyah
Keyword(s):  
20Th Century ◽  
Data Transmission ◽  
High Accuracy ◽  
Water Current ◽  
Average Error ◽  
Effective Distance ◽  
Long Distance ◽  
Flow Measurements ◽  
Measuring Device ◽  
The Moment

Abstract - In the 20th century this distance is still a constraint in efforts to measure and retrieve data. In an efficiency effort, a long distance measuring device is required. One method to measure from a distance is to use the Telemetry method. Telemetry is a method for measuring a variable in which monitoring is done remotely. The use of telemetry can be used to transmit data from the flowmeter sensor to be received by the receiver. This study discusses the effect of obstacles on transmitter work to send data to the receiver and test the accuracy of the flowmeter sensor. From this study it can be concluded that the effective distance of data transmission depends on the obstacle, the farthest distance is the moment without obstacles, then decreases when there is a hitch, and will decrease again when one receiver or transmitter is placed in a closed room. And for the accuracy of the sensor, the percentage of accuracy is low at the time of the slow water current, and vice versa high accuracy is obtained when the water current is fast. Based on the research we poured in this journal, water flow measurements using RF Arduino-based 433MHz Modules can measure the flow of water at a distance of up to 35meter with an average error of only 4.1%.

scholarly journals A Simplified Method for the Design of Steel Beam-to-column Connections

2017 ◽  
Vol 48 (2) ◽  
pp. 79-86
Author(s):  
Imola Kristóf ◽  
Zsanett Novák ◽  
Dezső Hegyi
Keyword(s):  
Failure Modes ◽  
Steel Structures ◽  
Simple Calculation ◽  
Geometric Parameters ◽  
End Plate ◽  
Simplified Method ◽  
Eurocode 3 ◽  
Steel Sections ◽  
The Moment ◽  
Hot Rolled

The moment resistance of beam-to-column connections is frequently utilised in steel structures. Eurocode 3 suggests the component method to analyse such connections, and it implements the equivalent T-stub method to determine the resistance of the end plate of the beam. The latter method requires tedious and concentrated work. A simplified method is suggested to reduce the number of calculations and enable the designer to focus on construction aspects in the pre-design phase, or in education.The resistance of the T-stub covers three possible failure modes: the yield of the plate, the failure of the of the bolt and simultaneous yield. The yield of the plate and simultaneous yield depend on numerous parameters, and they are verified by multiple equations. The failure of the bolts are more easily checked.In the present paper, requirements for geometric ratios are defined for the widely used steel sections to assure failure of the bolts at a lower level of the load than the yield of the plate. These parameters facilitate the simple calculation of the resistance of the bolts instead of the tedious work needed for the end plate resistance.The paper presents a proper explanation for the design rules and the effect of the geometric parameters on the resistance of the end plate. Geometric parameters are suggested for the widely used hot rolled and typical welded beam sections. All the parameters fulfil the requirements of the equivalent T-stub method of Eurocode 3.

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