scholarly journals Sensitivity Study on Influencing Factors of Coupled Motion Characteristics for Truss Spar

2021 ◽  
Vol 632 ◽  
pp. 022054
Author(s):  
Wenjun Shen ◽  
Zhonghua Tan ◽  
Chuanqi Hu
Keyword(s):  
Influencing Factors ◽  
Sensitivity Study ◽  
Coupled Motion ◽  
Truss Spar ◽  
Motion Characteristics

A preliminary investigation of tsunami hazard

1982 ◽  
Vol 72 (6A) ◽  
pp. 2323-2337
Author(s):  
I-Chen Lin ◽  
Chi C. Tung
Keyword(s):  
Seismic Moment ◽  
Preliminary Investigation ◽  
Wave Theory ◽  
Sensitivity Study ◽  
Tsunami Hazard ◽  
Submarine Earthquakes ◽  
Maximum Elevation ◽  
Motion Characteristics ◽  
A Site ◽  
Seismological Model

abstract A method for determining tsunami hazard is presented using simple seismological and hydrodynamic models. The seismological model assumes that submarine earthquakes of the dipstrike type can occur, with equal likelihood, anywhere along a well-defined straight fault and that the site under consideration lies on the perpendicular bisector of and far removed from the fault. The ground dislocation is circular in the horizontal plane, and the vertical offset is uniform. The radius of the circle and the vertical offset are related to seismic moment which is assumed to be random. The hydrodynamic model is based on linear dispersive wave theory. It is assumed that the earth is flat, water depth constant, and ocean infinite in horizontal extent. The maximum elevation of water surface of the leading wave is related to ground motion characteristics (or seismic moment) and the distance from the site to the source. The probability of the event that the water elevation at a site exceeds an arbitrary but specified level is then derived and computed. A sensitivity study is performed to determine the importance of various parameters.

scholarly journals Experimental and numerical investigation on coupled motion characteristics of a tunnel element suspended from a twin-barge

2018 ◽  
Vol 153 ◽  
pp. 201-214 ◽  
Author(s):  
Can Yang ◽  
Sam D. Weller ◽  
Yong-xue Wang ◽  
De-zhi Ning ◽  
Lars Johanning
Keyword(s):  
Numerical Investigation ◽  
Coupled Motion ◽  
Motion Characteristics

scholarly journals ANALYZING THE INFLUENCING FACTORS OF SPORTS FATIGUE BASED ON ALGORITHM

2021 ◽  
Vol 27 (4) ◽  
pp. 377-380
Author(s):  
Cheng Wang
Keyword(s):  
Influencing Factors ◽  
Composite Index ◽  
Level Of Evidence ◽  
Monitoring Method ◽  
Feature Extraction Method ◽  
Non Invasive ◽  
Svm Algorithm ◽  
Motion Characteristics ◽  
Exercise Fatigue ◽  
High Degree

ABSTRACT Objective: This paper discusses the monitoring method of exercise fatigue and analyzes the influencing factors of exercise fatigue. Methods: Based on the feature extraction method of the fatigue image signal, a series of changes caused by exercise fatigue are analyzed by the biofeedback technique. SVM algorithm and neural network model are used to identify the fatigue state of motion. Characteristics of electroencephalogram (EEG) and electromyography (EMG) during fatigue. Results: When sports fatigue occurred, the composite index of bio-feedback technology shows a decrease in HRV index and increases in HRV time-domain indicators, frequency-domain indicators, and SAa values. Conclusions: It has a high degree of systematization. The proposed method is non-invasive and has practical application value. Level of evidence II; Therapeutic studies - investigation of treatment results.

Prioritization of critical risk influencing factors in quantitative risk analyses for offshore petroleum installations

2020 ◽  
pp. 1748006X2094336
Author(s):  
Xingwei Zhen ◽  
Jan Erik Vinnem
Keyword(s):  
Risk Analysis ◽  
Influencing Factors ◽  
Influencing Factor ◽  
Pairwise Comparison ◽  
Organizational Factors ◽  
Sensitivity Study ◽  
Analysis Model ◽  
Analytic Hierarchy ◽  
Quantitative Risk Analysis ◽  
The Status

Comprehensive and detailed investigations of various major offshore accidents have shown that multifarious risk influencing factors including technical, human, and organizational factors have a significant impact on the nonlinear accident sequences. Parallel efforts are being made to develop quantitative risk analysis models involving risk influencing factors. It is recognized that in order to keep quantitative risk analyses in a manageable size, it is essential to restrict the number of risk influencing factors for each failure event. This article describes an effort to prioritize critical risk influencing factors for offshore maintenance work. A prioritization index integrating the weight and the status of each risk influencing factor is developed to determine the most appropriate prioritization. A hierarchy tree is developed to structure the identified risk influencing factors. The unified fuzzy scoring criterion is established for evaluating the risk influencing factors status. The fuzzy analytic hierarchy process approach stressing the consistency of the fuzzy pairwise comparison is applied to evaluate the priority of each risk influencing factor. A sensitivity study is conducted to investigate the criticality of risk influencing factors. The case study demonstrates that the proposed method can be a practical tool for prioritizing critical risk influencing factors effectively for all failure events in the quantitative risk analysis model. The method can also be useful in handling uncertainties arising in quantitative risk analyses.

Improving the Motions of a Semi by the Addition of Heave Plates

2008 ◽  
Author(s):  
Cheng-Yo Chen ◽  
Yun Ding ◽  
Trevor Mills ◽  
John Murray
Keyword(s):  
Gulf Of Mexico ◽  
Model Test ◽  
Cost Effective ◽  
Analytical Prediction ◽  
Test Results ◽  
Effective Manner ◽  
Truss Spar ◽  
Heave Plate ◽  
Motion Characteristics ◽  
Plate System

Similar to the manner in which heave plates provide a Truss Spar with low global motions, a heave plate system can be used to significantly mitigate the motions of a conventional semi-submersible. This paper will focus on the global performance of a conventional semi-submersible that has been properly configured with heave plates. The design case is a Gulf of Mexico deepwater environment similar to that for a Spar located in 5,600 feet of water. The system has eight top-tensioned risers (TTR) supported on the top of the semi hull with tensioners, a spread mooring and a 10,000-ton operating payload. Extensive global motion analyses and comprehensive model testing have been carried out to validate the in-place behavior of such a solution. This paper presents the validation results from the analytical prediction and the model test. A semi-submersible with properly configured heave plates can be used as a viable deepwater dry-tree floating solution in such harsh environments as in the Gulf of Mexico. Because of its superior motion characteristics, this solution is also more SCR friendly and can be a better wet-tree application as compared to conventional semi-submersibles. The analytical and model test results demonstrate that the excitation of a semi-submersible hull by wind, wave and current can be adequately mitigated by the proper placement and sizing of a heave plate system. The analysis and testing also indicates that to achieve suitable motions in a cost effective manner requires incorporating fabrication and installation issues into the heave plate system. The in-place behavior of this solution has been validated and thus proving the concept provides a viable cost effective dry-tree floating solution for deepwater developments.

Race Difference in Auditory Sensitivity

1964 ◽  
Vol 7 (4) ◽  
pp. 389-393 ◽  
Author(s):  
David C. Shepherd ◽  
Robert Goldstein ◽  
Benjamin Rosenblüt
Keyword(s):  
White Women ◽  
White Men ◽  
Sensitivity Study ◽  
Auditory Sensitivity ◽  
Race Difference ◽  
Men And Women ◽  
Auditory Thresholds ◽  
Békésy Audiometry ◽  
Method Of Adjustment ◽  
Better Than

Two separate studies investigated race and sex differences in normal auditory sensitivity. Study I measured thresholds at 500, 1000, and 2000 cps of 23 white men, 26 white women, 21 negro men, and 24 negro women using the method of limits. In Study II thresholds of 10 white men, 10 white women, 10 negro men, and 10 negro women were measured at 1000 cps using four different stimulus conditions and the method of adjustment by means of Bekesy audiometry. Results indicated that the white men and women in Study I heard significantly better than their negro counterparts at 1000 and 2000 cps. There were no significant differences between the average thresholds measured at 1000 cps of the white and negro men in Study II. White women produced better auditory thresholds with three stimulus conditions and significantly more sensitive thresholds with the slow pulsed stimulus than did the negro women in Study II.

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