scholarly journals Optimization and Development of the Model for Monitoring the Deformations on the Airport Runways

Processes ◽  
2021 ◽  
Vol 9 (5) ◽  
pp. 833
Author(s):  
Boštjan Kovačič ◽  
Damjan Doler ◽  
Darja Topolšek
Keyword(s):  
Continuous Monitoring ◽  
Static Load ◽  
Load Capacity ◽  
Air Traffic ◽  
Loss Of Control ◽  
Suggested Model ◽  
The Third ◽  
Innovative Model ◽  
Airport Infrastructure ◽  
Vertical Deformations

The demand for safety and to provide safety are increasing, parallel with the growth of the need for mobility, transport and logistics. A big part of the demands and recommendations to provide safety in air traffic is related to the safety at and in the surroundings of the runways. The research focused on exploring the airport infrastructure; mainly with the aim of detecting and monitoring the deformations (cracks, displacements, etc.) of the runways which are causally connected with unusual landings or taking offs, with trips from the runways and with loss of control over the aircraft during the landings, taking offs and while moving the runways or taxiways, etc., and researching their effect on providing safety and the efficiency of the airports’ function. The research was executed at the Maribor Edvard Rusjan Airport in three phases; the first two were meant for geodetic measurements to determine vertical deformations and the third for supplementary measurements to determine static load capacity. The result of the research is an innovative model for the continuous monitoring of the deformations on the runways. The suggested model enables determination and display of the areas of the vertical deviations which are impossible to detect with a visual check-up, joining the supplementary methods and assessing the condition of the runway based on executed measurements.

Potential Traffic Demand in the London Area

1965 ◽  
Vol 69 (652) ◽  
pp. 211-215 ◽  
Author(s):  
A. H. Watson
Keyword(s):  
Air Traffic ◽  
Traffic Demand ◽  
The Third ◽  
Air Space

The June 1963 Report of the Inter-Departmental Committee on the Third London Airport concluded that a third London Airport would be required in the early 1970's, and possibly a fourth soon after 1980. It also brought out that because of the large amounts of air space required for the sequencing areas and approach paths of each airport, and because of limitations imposed by the positioning of the main air traffic routeings, the choice of possible sites within reasonable distance of Central London for the third airport was severely restricted. In a postscript to the Report, it was recognised that after the third airport has taken over a further block of air space, the difficulty of siting a fourth airport would be even more severe.

Design and Load Rating Analysis of the Elastic Support for a Large Roller Bearing

1970 ◽  
Vol 92 (1) ◽  
pp. 113-117 ◽  
Author(s):  
W. D. Anderson ◽  
C. L. Dellinger
Keyword(s):  
Static Load ◽  
Load Capacity ◽  
Roller Bearing ◽  
Basic Oxygen Furnace ◽  
Computer Assisted ◽  
Curved Beam ◽  
Load Rating ◽  
Basic Oxygen ◽  
Beam Design ◽  
Assisted Analysis

The Basic Oxygen Furnace comprises a tiltable vessel supported by two trunnions in large roller bearings. To accommodate thermal expansion, the floating bearing is mounted on a deep curved beam which moves axially on two linear bearings. Under loads of 1 to 2 million pounds, the elastic deflection of this beam alters the static load capacity of the roller bearing. This paper describes a computer assisted analysis based on Castigliano’s First Theorem for determining the effective bearing capacity, and secondly for optimizing the beam design.

Vulnerability: Towards a Better Understanding of a Key Variable in the Genesis of Fear of Crime

1990 ◽  
Vol 5 (2) ◽  
pp. 97-108 ◽  
Author(s):  
Martin Killias
Keyword(s):  
Fear Of Crime ◽  
Analytical Framework ◽  
Situational Factors ◽  
Three Dimensions ◽  
International Review ◽  
Loss Of Control ◽  
Suggested Model ◽  
Considerable Support

Previous research on fear of crime has identified, among women and other sub-groups of the population, high fear levels which could not be adequately explained by measures of exposure to risk. Several authors have argued, therefore, that vulnerability may be the key variable behind the observed distribution of fear of crime. In this paper, three dimensions of vulnerability (exposure to risk, seriousness of consequences, loss of control) are identified and integrated into an analytical framework which also takes into account physical, social, and situational factors of vulnerability. A selective international review of research reveals considerable support for the suggested model.

Design of an Improved Nonlinear Disc Spring Vibration Isolator

2016 ◽  
Vol 835 ◽  
pp. 643-648
Author(s):  
Jia Fang ◽  
Huang Dong
Keyword(s):  
Vibration Isolation ◽  
Static Load ◽  
Load Capacity ◽  
Hysteresis Curve ◽  
Mechanical Equipment ◽  
Vibration Isolator ◽  
Element Analysis ◽  
Heavy Load ◽  
New Type ◽  
Disc Spring

An improved nonlinear vibration isolator is proposed in this paper. It uses the exact solution derived load-displacement hysteresis curve formula based on energy method to calculate disc spring, combined with the finite element analysis. The static load capacity and dynamic mechanical property of this new type disc spring vibration isolator is validated through the static load tests or fatigue analysis. Compared with the rubber vibration isolator, the conclusion can be found: the new type vibration isolator has wider scope of vibration isolation, and is better in low frequency vibration isolation. These research achievements are of significant importance in the vibration isolation of heavy load and great shock mechanical equipment.

scholarly journals Contact Analysis and Static Load Carrying Capacity of Planetary Roller Screw Mechanism

2020 ◽  
Author(s):  
Nam Su Kim ◽  
Kyongho Kim ◽  
Sinhyok Jong
Keyword(s):  
Finite Element ◽  
Contact Stress ◽  
Carrying Capacity ◽  
Static Load ◽  
Load Capacity ◽  
Load Carrying Capacity ◽  
Elastic Plastic ◽  
Load Carrying ◽  
Roller Screw ◽  
Screw Mechanism

Abstract This paper aims to investigate the contact characteristics and static load carrying capacity of planetary roller screw mechanism (PRSM). Compared to the ball screw mechanism, the advantages of the PRSM are high stiffness, high load capacity, long travel life and compact structure, etc., since the PRSM possesses more contact points than ball screws in a comparable size. The actuated load is carried through the threaded surface contacts of the screw, the rollers and the nut and the contact characteristics of these components are very important for studying the wear, transmission accuracy and efficiency of a PRSM. Prior work has neglected to take a fundamental approach towards understanding the elastic-plastic contact characteristics of threaded surfaces under high loads and it is closely related to the static load carrying capacity of PRSM. Accordingly, in this paper, the contact characteristics of PRSM under the different working loads are modeled based on Hertz contact theory and the calculation formulas between normal force of thread turns and the elastic-plastic contact stress and deformation are derived. Then, it goes further to derive a calculation method of static load carrying capacity of PRSM based on simplified model of static load distribution. Finally, a verification model is developed by finite element method (FEM) to perform contact stress and strain analysis of PRSM. Besides, through the comparison of the results between the theory model and ANSYS Workbench finite element model verify the reliability of the theory.

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