Study of Shape Factor for Reducing Ice Force on Arctic Structure and Ice Force Prediction for Combined Ice Failure

1990 ◽  
Author(s):  
C.H. Jo ◽  
J.L. Machemehl
Keyword(s):  
Shape Factor ◽  
Force Prediction ◽  
Ice Failure ◽  
Ice Force

Dynamic Ice Force Analysis on a Conical Structure Based on Direct Observation and Measurement

2013 ◽  
Vol 136 (1) ◽  
Author(s):  
Ning Xu ◽  
Qianjin Yue
Keyword(s):  
Video Camera ◽  
Temporal Variations ◽  
Qualitative Description ◽  
Basic Model ◽  
Broken Ice ◽  
Conical Structure ◽  
Ice Failure ◽  
Ice Force ◽  
Bending Failure ◽  
Ice Forces

In order to study dynamic ice force induced by ice-structure interaction, we adopted the most reliable method to directly measure ice force on full-scale structure. This paper mainly demonstrates the qualitative description on the basic model for dynamic ice forces based on direct measurement on the jackets with ice-breaking cone in the Bohai Sea. Temporal variations of ice force are recorded by the ice load panels, and corresponding ice failure processes on conical structures are recorded by video camera. It is found that, when an ice sheet acts on the upward narrow cone, bending failure occurs and broken ice pieces are completely cleared up by the side of the cone. The basic form of dynamic ice force in time domain is a series of impulse signals with minimum load of zero.

A Finite Element Method to Simulate Ice Based on Multi-Surface Failure Criterion

2014 ◽  
Vol 623 ◽  
pp. 90-96
Author(s):  
Chuan Wang ◽  
Hui Long Ren ◽  
Hui Li
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Special Problem ◽  
Actual Process ◽  
Finite Element Software ◽  
Surface Failure ◽  
Ice Failure ◽  
Ice Force ◽  
Mechanic Property ◽  
Element Method

A finite element method is introduced to simulate ice failure based on multi-surface criterion. The effects of porosity, temperature and strain rates on the ice mechanic property are taken into consideration. The main principle to simulate environment is explained. Through second developed to the finite element software, the process of ship-ice interaction is simulated. And the ship motion, ice force and ice failure mode are predicted by this method. The result is compared with other papers. the numerical simulation phenomenon is nearly same with the actual process. It suggests that simulation is reasonable, and the model has potential value in simulations of assessing ship strength. The fatigue damage is pointed out to be a special problem in ice-going ship design.

Ice Action on Two Cylindrical Structures

1984 ◽  
Vol 106 (1) ◽  
pp. 107-112 ◽  
Author(s):  
K. Kato ◽  
D. S. Sodhi
Keyword(s):  
Dominant Frequency ◽  
Small Scale ◽  
Interference Effects ◽  
Cylindrical Structures ◽  
Structure Interaction ◽  
Individual Structure ◽  
The Individual ◽  
Ice Failure ◽  
Ice Force ◽  
Ice Forces

Ice action on two cylindrical structures, located side by side, has been investigated in a small-scale experimental study to determine the interference effects on the ice forces generated during ice structure interaction. The proximity of the two structures changes the mode of ice failure, the magnitude and direction of ice forces on the individual structure, and the dominant frequency of ice force variations. Interference effects were determined by comparing the experimental results of tests at different structure spacings.

Model-based observers for vehicle dynamics and tyre force prediction

2021 ◽  
pp. 1-26
Author(s):  
Giulio Reina ◽  
Antonio Leanza ◽  
Giacomo Mantriota
Keyword(s):  
Vehicle Dynamics ◽  
Force Prediction ◽  
Model Based

scholarly journals Optimising the Complex Refractive Index Model for Estimating the Permittivity of Heterogeneous Concrete Models

2021 ◽  
Vol 13 (4) ◽  
pp. 723
Author(s):  
Hossain Zadhoush ◽  
Antonios Giannopoulos ◽  
Iraklis Giannakis
Keyword(s):  
Refractive Index ◽  
Shape Factor ◽  
Complex Refractive Index ◽  
Fdtd Method ◽  
Air Voids ◽  
Water Fraction ◽  
Index Model ◽  
General Complex ◽  
Ground Penetrating ◽  
Fine Tune

Estimating the permittivity of heterogeneous mixtures based on the permittivity of their components is of high importance with many applications in ground penetrating radar (GPR) and in electrodynamics-based sensing in general. Complex Refractive Index Model (CRIM) is the most mainstream approach for estimating the bulk permittivity of heterogeneous materials and has been widely applied for GPR applications. The popularity of CRIM is primarily based on its simplicity while its accuracy has never been rigorously tested. In the current study, an optimised shape factor is derived that is fine-tuned for modelling the dielectric properties of concrete. The bulk permittivity of concrete is expressed with respect to its components i.e., aggregate particles, cement particles, air-voids and volumetric water fraction. Different combinations of the above materials are accurately modelled using the Finite-Difference Time-Domain (FDTD) method. The numerically estimated bulk permittivity is then used to fine-tune the shape factor of the CRIM model. Then, using laboratory measurements it is shown that the revised CRIM model over-performs the default shape factor and provides with more accurate estimations of the bulk permittivity of concrete.

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