Ice Pressure Prediction Based on the Probabilistic Method for Ice-Going Vessels in Inland Waterways

2018 ◽  
Vol 141 (2) ◽  
Author(s):  
Meng Zhang ◽  
Harsha Cheemakurthy ◽  
Sören Ehlers ◽  
R. U. Franz von Bock und Polach ◽  
Karl Garme ◽  
...  
Keyword(s):  
Impact Load ◽  
Probabilistic Method ◽  
Control Point ◽  
Great Influence ◽  
Point Of View ◽  
Design Strategies ◽  
Inland Waterways ◽  
Transport Efficiency ◽  
Ice Pressure ◽  
The Impact

With increasing need to utilize inland waterways (IWW), the design of IWW vessels gains attention both from a transport efficiency and an emission control point of view. The primary challenge is to estimate the ice pressure acting on the ship hull for IWW. Ice information for Lake Mälaren is extracted and analyzed in this work. Since the ice properties have great influence on the impact load, they are studied based on empirical formulae and are calibrated by reference data. The ice impact is then predicted for an IWW barge. Probabilistic method is selected to derive the load based on available field test data. Several parent datasets are chosen, and different design strategies are implemented to evaluate the ice impact load and investigate the influence from exposure factors. The paper finds that the design curve of α=0.265a−0.57 can be used for Lake Mälaren. The approach itself introduces a possible way to investigate loads on ice-affected IWW.

Ice Pressure Prediction Based on the Probabilistic Method for Ice-Going Vessels in Inland Waterways

2018 ◽  
Author(s):  
Meng Zhang ◽  
Harsha Cheemakurthy ◽  
Sören Ehlers ◽  
R. U. Franz von Bock und Polach ◽  
Karl Garme ◽  
...  
Keyword(s):  
Impact Load ◽  
Probabilistic Method ◽  
Control Point ◽  
Great Influence ◽  
Point Of View ◽  
Design Strategies ◽  
Inland Waterways ◽  
Transport Efficiency ◽  
Ice Pressure ◽  
The Impact

With increasing need to utilize inland waterways (IWW), the design for IWW vessels gains attention both from a transport efficiency and an emission control point of view. The primarily issue is to estimate the ice pressure acting on the ship hull for inland waterways. Ice information for Lake Mälaren is extracted and analysed in this work. Since the ice properties have great influence on the impact load, they are studied based on empirical formulae and are calibrated by reference data. The ice impact is then predicted for an inland water barge. Probabilistic method is selected to derive the load based on available field test data. Several parent datasets are chosen, and different design strategies are implemented to evaluate the ice impact load and investigate the influences from exposure factors. The paper finds that the design curve of α = 0.265a−0.57 can be used for Lake Mälaren. The approach itself introduces a possible way to investigate loads on ice affected IWW.

Energy Efficiency Design Strategy of Commercial Building in Northeast Cold Regions

2012 ◽  
Vol 174-177 ◽  
pp. 2165-2169
Author(s):  
Yao Fu ◽  
Tian Heng Zhang
Keyword(s):  
Architectural Design ◽  
Building Energy ◽  
Point Of View ◽  
Commercial Building ◽  
Design Strategies ◽  
Cold Regions ◽  
Location Selection ◽  
Shape Coefficient ◽  
Energy Evaluation ◽  
The Impact

From the point of view of architectural design, envelope location, selection, and identify programs of envelope structure in the modern commercial building, give priority to the establishment of image of shopping malls , creating the mood of commercial and other factors. The paper will establish the appropriate model to the impact of the shape coefficient of Commercial building energy consumption in cold regions, validity analysis used the building energy evaluation software named Autodesk Ecotect to provide adequate theoretical basis of energy conservation design strategies.

Restart tourism | build the future

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Rita Marques
Keyword(s):  
Value Chain ◽  
Great Influence ◽  
Point Of View ◽  
Political Community ◽  
Data Systems ◽  
Scientific Publications ◽  
Economic Point ◽  
Content Type ◽  
The Future ◽  
The Impact

PurposeThis viewpoint aims to explore the question: How can we restart and monitor the path towards the tourism of the future?Design/methodology/approachThis paper identifies the progress made at scientific, institutional, political and technological levels, and how it is possible to foresee that we will enter in a new era of tourism indicators.FindingsA significant body of literature clearly demonstrates that tourism cannot be viewed simply from an economic point of view as it has a great influence on sociocultural and environmental dimensions. The impact of tourism and how to ensure its long-term success has been invoked for the last few decades, leading to the direct consideration of sustainability indicators in a wide array of scientific publications. However, despite significant advances, the lack of funding, lack of support or interest from the political community, bureaucracies or lack of methodological guidance and of technical skills along the entire value chain pose clear challenges to the development and adoption of wide data systems to support sustainable tourism policies.Originality/valueThe paper sheds light on the Portuguese position regarding the recovery of the tourism sector in the aftermath of the COVID-19 pandemic. It also highlights the commitment to knowledge and monitoring of sustainability in tourism, articulated at international level, and how this is essential in order to make progress and to overcome the challenges facing the sector. At the same time, it demonstrates how fundamental it is to identify solutions to boost the potential of tourism as an economic, social, environmental and cultural phenomenon.

Dynamic Analysis of Liquid Sloshing for Shipboard Pressure Vessel

2020 ◽  
Author(s):  
Qi Li ◽  
Hui Tang ◽  
Fujun Zhang ◽  
Zhijian Wang ◽  
Qianyu Shi
Keyword(s):  
Dynamic Analysis ◽  
Pressure Vessel ◽  
Impact Load ◽  
Great Influence ◽  
Liquid Sloshing ◽  
Pressure Curve ◽  
Operation Condition ◽  
Device Structure ◽  
Safety Operation ◽  
The Impact

Abstract With the development of pressure vessel industry in China, more and more pressure vessel is widely used in the aerospace, automobile, marine project and other fields. The liquid sloshing in the device could bring adverse effect on the safety operation of the pressure vessel under the extrinsic excitation, such as the impact load results in the failure of device structure. Thus, dynamic analysis of liquid sloshing for the shipboard pressure vessel is significant. According to the little research on the design criteria and the method of the shipboard pressure vessel, this paper focuses on the research of the transient sloshing of the internal liquid in the shipboard pressure vessel. In this paper, during analyzing the liquid sloshing dynamic of the shipboard pressure vessel, an obvious cycle is got. Considering the operation condition of lateral inclination, longitudinal inclination and heave in the complex marine environment, the liquid sloshing character is obtained and compared through the liquid surface height curve and the wall sloshing pressure curve, which has great influence on the piping layout of the pressure vessel. Moreover, it is beneficial to restrain sloshing through installing baffle inside the pressure vessel. This may provide a project reference to liquid sloshing design of the shipboard pressure vessel.

scholarly journals ENVIRONMENTAL INDICATORS OF THE EFFICIENT FUNCTIONING OF AGROINDUSTRIAL TERRITORIES OF ADVANCED DEVELOPMENT

2020 ◽  
Author(s):  
L. A. Voyevodina ◽  
Keyword(s):  
Water Resources ◽  
Raw Materials ◽  
Environmental Indicators ◽  
Point Of View ◽  
Transport Efficiency ◽  
Economic Entity ◽  
Before And After ◽  
Four Blocks ◽  
The Impact ◽  
Advanced Development

Purpose: substantiation of environmental indicators of the efficiency of functioning of agro-industrial territory of advanced development (APTOR). Materials and methods. The methods of systematic, complex study, comparison, analysis and generalization of data were used. Results. As a result of the study, indicators that characterize the efficiency of APTOR functioning from an environmental point of view have been identified. The proposed indicators are harmonized with previously developed, widespread and recognized domestic and international methods. The main focus of the proposed indicators is aimed at assessing the effectiveness of management and operative activity. To characterize the efficiency of the APTOR activity based on the use of reclamation technologies, including reclamation parks, it is recommended to use, first of all, indicators indicating the efficiency of water resources use, among which the definition in dynamics (before and after the APTOR operation) “water consumption in the calculation per unit (in physical or value terms) of products (agricultural raw materials and products from them) produced at APTOR”. Due to the fact that the APTOR activities, which is planned to include many technological processes, can have a significant impact on other components of the environment, except for water resources, it is proposed to calculate indicators demonstrating the impact of APTOR activities on the state of air and soil in terms of energy efficiency, transport efficiency, pollution and waste management. On the basis of the indicators for the above recognized equal four blocks, an integrated indicator can be calculated. Conclusions. The use of the proposed indicators will make it possible to assess the effectiveness of the ecological activity of a new economic entity: an agro-industrial territory of advanced development.

The influence of innovation on the inland waterway transport efficiency

2018 ◽  
Vol 120 ◽  
pp. 179-188
Author(s):  
Magdalena Kaup ◽  
Dorota Łozowicka
Keyword(s):  
Water Transport ◽  
Transport Processes ◽  
Inland Waterways ◽  
Factors Affecting ◽  
Transport Efficiency ◽  
Inland Water ◽  
Modern Management ◽  
Inland Waterway ◽  
The Impact ◽  
Inland Water Transport

The interest in inland waterway transport observed in recent years in Poland has highlighted the imperfections of both the existing infrastructure and the fleet of inland vessels. Therefore, it was necessary to adapt to EU standards, which requires taking actions that will improve the conditions of transport processes using inland waterways. The number, scope and level of introduced new improvement, modernization and innovation solutions determine the modern management of inland waterway transport. The article presents efficiency and its basic indicators in inland water transport. In addition, the impact of innovation on the development of inland waterway transport was discussed. The aim of the article is to identify and analyze factors affecting the efficiency of inland waterway transport, and in particular to assess the impact of applying innovation on the improvement of inland waterway transport.

Improvement of aircraft crashworthy performance using inversion failure strut system

2017 ◽  
Vol 89 (2) ◽  
pp. 330-337 ◽  
Author(s):  
Yiru Ren ◽  
Jinwu Xiang
Keyword(s):  
Energy Absorption ◽  
Impact Load ◽  
Great Influence ◽  
Absorption Efficiency ◽  
The Novel ◽  
Content Type ◽  
Failure Behaviour ◽  
Energy Absorption Efficiency ◽  
Geometrical Factors ◽  
The Impact

Purpose The purpose of this paper is to improve the crashworthiness of aircraft by using the strut system as an energy absorption device without redesigning other components. Design/methodology/approach The novel strut system consists of metal stepped thin-walled tubes and articulated connecting hinges. The strut is suffering axial load during impact process for rotating of hinges, and the metal stepped tube has an inversion failure behaviour. Findings The metal stepped tube has lower initial impact load and more stable failure behaviour. The geometrical factors have a great influence on the impact load and energy absorption efficiency. The best length ratio between upper and lower sections is about 2:1 and 1:1 for the metal stepped circular and square tubes, respectively. Practical implications The metal stepped tube with inversion mechanism is suitable for aircraft strut system to improve crashworthiness performance. Originality/value A new strut system is provided using metal inversion failure stepped tubes and articulated connecting hinges to improve crash worthiness of aircraft.

scholarly journals Train Derailment Process Analysis on Heavy Haul Railway Bridge under Ship Impact

Symmetry ◽  
2021 ◽  
Vol 13 (11) ◽  
pp. 2122
Author(s):  
Kai Gong ◽  
Linya Liu ◽  
Cuiying Yu ◽  
Chen Wang
Keyword(s):  
Impact Load ◽  
Lateral Displacement ◽  
Process Analysis ◽  
Great Influence ◽  
Reduction Rate ◽  
Relative Displacement ◽  
Wheel Load ◽  
Train Derailment ◽  
Spatial Vibration ◽  
The Impact

In order to research train derailment law under ship impact, the spatial vibration calculation model of a freight train-track-bridge (FTTB) system is used to establish the vibration model of the FTTB system under ship impact. Meanwhile, the calculation method of a train derailment process under ship impact is proposed based on the random analysis method of train derailment energy. Further, the train derailment process on a bridge under ship impact is calculated, and the variation law of the FTTB system spatial vibration response under different impact loads and speeds is analyzed. The results show that the ship impact load has a great influence on wheel lift value. When the impact load is greater than 15 MN, the wheel derails more easily. With the increase of impact load, the derailment coefficient, wheel load reduction rate, and lateral relative displacement of bogie and rail, the lateral displacement of the bridge increases significantly, but the limits of them make it difficult to determine whether the wheel has derailed. The lateral relative displacement of the bogie and rail considering the safety factor is calculated at the moment of derailment, which is taken as the early warning threshold of train derailment. The above conclusions can provide a reference for controlling train safety under ship impact.

scholarly journals Experimental Study and Numerical Analysis on Impact Resistance of Civil Air Defense Engineering Shear Wall

2021 ◽  
Vol 2021 ◽  
pp. 1-20
Author(s):  
Chenglong Shi ◽  
Jigang Zhang ◽  
Junbo Zhang ◽  
Feng Shao ◽  
Yicong Zhang ◽  
...  
Keyword(s):  
Impact Load ◽  
Impact Resistance ◽  
Great Influence ◽  
Shear Walls ◽  
Horizontal Displacement ◽  
Shear Wall ◽  
Factors Affecting ◽  
Air Defense ◽  
Impact Surface ◽  
The Impact

In order to study the impact resistance of civil air defense engineering shear wall, the impact resistance of civil air defense engineering shear wall was studied by combining finite element numerical simulation with pendulum impact test. The effects of impact height, pendulum mass, and impact times on the impact resistance of civil air defense engineering shear walls were analyzed. It was shown that when the impact height increased from 0.4 m to 2.5 m, the failure mode of civil air defense engineering shear wall tended to be local impact failure, and the horizontal displacement in the middle of the wall span increased. The concrete crushing occurred in the impact area of the back of the civil air defense engineering shear wall. The increase in the impact height is a negative factor for the impact resistance of the civil air defense engineering shear wall. With the increase of pendulum weight, the number of concrete horizontal cracks in the back of the civil air defense engineering shear wall increased, while the number of vertical cracks decreased, but the impact surface was destroyed. Through multiple impact tests on the civil air defense engineering shear wall, the civil air defense engineering shear wall had accumulated damage. The longitudinally loaded steel on the back reached the ultimate strength, and there are large cracks at the bottom and even collapses. The increase of impact times has a great influence on the impact resistance of the civil air defense engineering shear wall. Through the analysis of the factors affecting the impact resistance of civil air defense engineering shear wall, it provides guidance for civil air defense engineering shear wall to resist impact load.

The Geosciences Applied to Lunar Exploration

1962 ◽  
Vol 14 ◽  
pp. 169-257 ◽  
Author(s):  
J. Green
Keyword(s):  
Lunar Surface ◽  
Probable Mechanism ◽  
Point Of View ◽  
Lunar Exploration ◽  
Geological Model ◽  
Apply Geophysics ◽  
Surface Features ◽  
The Impact

The term geo-sciences has been used here to include the disciplines geology, geophysics and geochemistry. However, in order to apply geophysics and geochemistry effectively one must begin with a geological model. Therefore, the science of geology should be used as the basis for lunar exploration. From an astronomical point of view, a lunar terrain heavily impacted with meteors appears the more reasonable; although from a geological standpoint, volcanism seems the more probable mechanism. A surface liberally marked with volcanic features has been advocated by such geologists as Bülow, Dana, Suess, von Wolff, Shaler, Spurr, and Kuno. In this paper, both the impact and volcanic hypotheses are considered in the application of the geo-sciences to manned lunar exploration. However, more emphasis is placed on the volcanic, or more correctly the defluidization, hypothesis to account for lunar surface features.

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