Analysis of High Pressure Zone Attributes From Tactile Pressure Sensor Field Data

2014 ◽  
Author(s):  
Martin Richard ◽  
Rocky S. Taylor
Keyword(s):  
High Pressure ◽  
Indentation Test ◽  
Field Measurements ◽  
Tactile Sensor ◽  
Threshold Value ◽  
Companion Paper ◽  
Sensor Data ◽  
Pressure Zone ◽  
Pressure Threshold ◽  
High Pressure Zone

Tactile sensor data collected during the Japan Ocean Industries Association (JOIA) medium-scale field indentation test program provide detailed information about spatial and temporal distributions of contact pressures during ice crushing. The localization of contact into high pressure zones (hpzs) through which the majority of loads are transmitted to the structure is an important feature of these data. For all but the slowest interaction rates, non-simultaneous failure is observed, with linear distributions of hpzs comprising a total contact area on the order of 10% of the nominal interaction area (structure width × ice thickness). To improve understanding of the nature of individual hpzs during compressive ice failure, a new approach to analyzing tactile sensor data has been developed. Analysis algorithms developed for automatic hpz detection and tracking are discussed. Issues associated with pressure threshold value definition and selection are considered. Probabilistic descriptions of high pressure zone attributes based on analysis of JOIA field measurements are presented. The development of a probabilistic ice load model based on these hpz data is detailed in a companion paper.

Development of a Probabilistic Ice Load Model Based on Empirical Descriptions of High Pressure Zone Attributes

2014 ◽  
Author(s):  
Rocky S. Taylor ◽  
Martin Richard
Keyword(s):  
High Pressure ◽  
Failure Process ◽  
Temporal Distribution ◽  
Tactile Sensor ◽  
Companion Paper ◽  
Offshore Structures ◽  
Load Model ◽  
Ice Load ◽  
High Pressure Zone ◽  
Ice Failure

During an ice-structure interaction, the localization of contact into high pressure zones (hpzs) has important implications for the manner in which loads are transmitted to the structure. In a companion paper, new methods for extracting empirical descriptions of the attributes of individual hpzs from tactile sensor field data for thin first-year sea ice have been presented. In the present paper these new empirical hpz relationships have been incorporated into a probabilistic ice load model, which has been used to simulate ice loads during level ice interactions with a rigid structure. Additional aspects of the ice failure process, such as relationships between individual hpzs and the spatial-temporal distribution of hpzs during an interaction have also been explored. Preliminary results from the empirical hpz ice load model have been compared with existing empirical models and are discussed in the context of both local and global loads acting on offshore structures.

A Probabilistic High-Pressure Zone Model for Local and Global Loads During Ice-Structure Interactions

2019 ◽  
Vol 141 (5) ◽  
Author(s):  
Rocky S. Taylor ◽  
Martin Richard ◽  
Ridwan Hossain
Keyword(s):  
High Pressure ◽  
Field Measurements ◽  
Zone Model ◽  
Probabilistic Framework ◽  
Local Pressure ◽  
Pressure Zone ◽  
Current Design ◽  
Ice Loads ◽  
High Pressure Zone ◽  
Ice Failure

For temperate ice regions, guidance provided by current design codes regarding ice load estimation for thin ice is unclear, particularly for local pressure estimation. This is in part due to the broader issue of having different recommended approaches for estimating local, global, and dynamic ice loads during level ice interactions with a given structure based on region, scenario type, and a variety of other conditions. It is essential from a design perspective that these three scenarios each be evaluated using appropriate definitions for local design areas, global interaction area, and other structural details. However, the need for use of different modeling approaches for ice loads associated with each of these scenarios is not based on ice mechanics but rather has largely evolved as a result of complexities in developing physics-based models of ice failure in combination with the need to achieve safe designs in the face of limited full-scale data and the need for implementation in a probabilistic framework that can be used for risk-based design assessments. During a given interaction, the ice is the same regardless of the design task at hand. In this paper, a new approach is proposed based on a probabilistic framework for modeling loads from individual high-pressure zones acting on local and global areas. The analysis presented herein considers the case of thin, first-year sea ice interacting with a bottom-founded structure based on an empirical high-pressure zone model derived from field measurements. Initial results indicate that this approach is promising for modeling local and global pressures.

scholarly journals OC42: Visualization of the vaginal high-pressure zone by three-dimensional ultrasound images in the pelvic floor

2006 ◽  
Vol 28 (4) ◽  
pp. 371-371
Author(s):  
S. A. Jung ◽  
D. H. Pretorius ◽  
B. S. Padda ◽  
M. M. Weinstein ◽  
C. W. Nager ◽  
...  
Keyword(s):  
High Pressure ◽  
Pelvic Floor ◽  
Three Dimensional ◽  
Ultrasound Images ◽  
Pressure Zone ◽  
High Pressure Zone

Tu1803 Dysphagia Post-Fundoplication Evaluated With High-Resolution Manometry (HRM). The Relevance of a Dual High-Pressure Zone

2013 ◽  
Vol 144 (5) ◽  
pp. S-850
Author(s):  
Etsuro Yazaki ◽  
Yu Tien Wang ◽  
Jafar Jafari ◽  
Asma Fikree ◽  
Nora Schaub ◽  
...  
Keyword(s):  
High Pressure ◽  
High Resolution ◽  
High Resolution Manometry ◽  
Pressure Zone ◽  
High Pressure Zone
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