Paper 4. Towed Bodies

1972 ◽  
Vol 14 (7) ◽  
pp. 20-28
Author(s):  
M. A. Abkowitz
Keyword(s):  
Stability Analysis ◽  
Mathematical Models ◽  
Equilibrium Configuration ◽  
Future Research ◽  
Hydrodynamic Loads ◽  
Stability And Control ◽  
Cable Dynamics ◽  
Factors Influencing ◽  
And Control

The problems of stability and control are surveyed for the system comprising towing body, connecting cable and towed body. Factors influencing the equilibrium configuration are first outlined, followed by a discussion of methods of stability analysis based on the assumption of a taut cable. Limitations of the assumption are indicated, leading to an appreciation of cable dynamics, and a summary of mathematical models of cables under hydrodynamic loads. The problems involved and directions for future research are suggested. Appendices 4.1 and 4.2 give extensive bibliographies on towed systems.

Paper 26. Stability and Control in Waves: A Survey of the Problem

1972 ◽  
Vol 14 (7) ◽  
pp. 186-193 ◽  
Author(s):  
J. E. Conolly
Keyword(s):  
Mathematical Models ◽  
Orbital Motion ◽  
Model Tests ◽  
Point Of View ◽  
Stability And Control ◽  
Free Running ◽  
And Control

Manoeuvrability in waves is discussed from the point of view of the dangers of broaching-to when a ship is running before the sea. Conditions are assessed under which this may occur, illustrated by documented cases, including the Wahine disaster in 1968. Because of the problems involved in investigating broaching-to by means of free-running model tests, there is an urgent need for reliable mathematical models: however, theories published so far, based on two different simplifications, are shown to have limitations. It is argued that the theory must take account of pitching, surging, rolling and orbital motion of the water particles.

scholarly journals A Concept Mapping Study of Physicians’ Perceptions of Factors Influencing Management and Control of Hypertension in Sub-Saharan Africa

2015 ◽  
Vol 2015 ◽  
pp. 1-9 ◽  
Author(s):  
Juliet Iwelunmor ◽  
Sarah Blackstone ◽  
Joyce Gyamfi ◽  
Collins Airhihenbuwa ◽  
Jacob Plange-Rhule ◽  
...  
Keyword(s):  
Concept Mapping ◽  
Research Training ◽  
Sub Saharan Africa ◽  
Future Research ◽  
Hypertension Management ◽  
Optimal Management ◽  
Related Factors ◽  
Factors Influencing ◽  
Sub Saharan ◽  
And Control

Hypertension, once a rare problem in Sub-Saharan Africa (SSA), is predicted to be a major cause of death by 2020 with mortality rates as high as 75%. However, comprehensive knowledge of provider-level factors that influence optimal management is limited. The objective of the current study was to discover physicians’ perceptions of factors influencing optimal management and control of hypertension in SSA. Twelve physicians attending the Cardiovascular Research Training (CaRT) Institute at the University of Ghana, College of Health Sciences, were invited to complete a concept mapping process that included brainstorming the factors influencing optimal management and control of hypertension in patients, sorting and organizing the factors into similar domains, and rating the importance and feasibility of efforts to address these factors. The highest ranked important and feasible factors include helping patients accept their condition and availability of adequate equipment to enable the provision of needed care. The findings suggest that patient self-efficacy and support, physician-related factors, policy factors, and economic factors are important aspects that must be addressed to achieve optimal hypertension management. Given the work demands identified by physicians, future research should investigate cost-effective strategies of shifting physician responsibilities to well-trained no-physician clinicians in order to improve hypertension management.

The Stability and Control of Motorcycles

1971 ◽  
Vol 13 (5) ◽  
pp. 316-329 ◽  
Author(s):  
R. S. Sharp
Keyword(s):  
Mathematical Models ◽  
Stability And Control ◽  
Design Changes ◽  
Minimum Requirements ◽  
The Stability ◽  
And Control

Mathematical models of a motorcycle and rider dependent on three alternative assumptions concerning the tyre behaviour are developed. Stability characteristics deduced from them are compared, and minimum requirements for the model greater than have been previously satisfied are established. Using the most sophisticated of the models, the effects of design changes are calculated, and the design implications are discussed.

scholarly journals Effect of Twin Vertical Stabilizers on Lateral Directional Static Stability of an Aircraft – A Computational Study

2022 ◽  
pp. 89-95
Author(s):  
K Ajay Kumar Goud ◽  
Y D Dwivedi
Keyword(s):  
Stability Analysis ◽  
Dynamic Model ◽  
Computational Study ◽  
Static Stability ◽  
Lateral Stability ◽  
Control Parameters ◽  
Stability And Control ◽  
The Stability ◽  
And Control ◽  
The Relationship

The advantages of twin vertical Stabilizers over a single vertical Stabilizer of an aero plane are the rationale for this study. For conventional aero planes, the use of double vertical Stabilizers is being considered. The contribution to lateral stability has been examined for this application. XFLR5 software was used to conduct the overall analysis. The analysis was conducted for a single vertical Stabilizer as well as twin vertical Stabilizers, and the findings were compiled and correlated. It is critical to be able to fully explain and evaluate the stability and control parameters. It is crucial to understand the relationship between the aerodynamics of the airframe and its stability characteristics in order to increase flight endurance and deployment effectiveness. The stability analysis based on the dynamic model of the twin boom vertical Stabilizer is presented in this paper. The lateral-directional stability of an aero plane with a single vertical tail is determined to be 20% more efficient than that with twin boom vertical Stabilizers. The trim condition is moderately satisfied by an aircraft with twin vertical Stabilizers.

Nonlinear analysis of stability and control for an F-16 configuration

1997 ◽  
Author(s):  
Zhongjun Wang ◽  
Zhidai He ◽  
C. Lan ◽  
Zhongjun Wang ◽  
Zhidai He ◽  
...  
Keyword(s):  
Nonlinear Analysis ◽  
Stability And Control ◽  
Analysis Of Stability ◽  
And Control

Designing Stability and Control Augmentation Systems Using Genetic Algorithms

2009 ◽  
Author(s):  
Ashraf Omran ◽  
Mohamed Elshabasy ◽  
Wael Mokhtar ◽  
Brett Newman ◽  
Mohamed Gharib
Keyword(s):  
Genetic Algorithms ◽  
Stability And Control ◽  
And Control

An Investigation on Extrinsic and Intrinsic Rewards on Employee Retention among Gen Y: A Study in Malaysian Manufacturing Companies

2020 ◽  
Vol 3 (1) ◽  
Keyword(s):  
Regression Analysis ◽  
Employee Retention ◽  
Future Research ◽  
Manufacturing Companies ◽  
Extrinsic Reward ◽  
Intrinsic Rewards ◽  
Gen Y ◽  
Intrinsic Reward ◽  
Factors Influencing ◽  
The Relationship

The aim of this study is to investigate the relationship between extrinsic and intrinsic reward on retention among Gen Y employees in Malaysian manufacturing companies. The data was collected from 113 respondents worked in manufacturing companies located in Seri Kembangan, Selangor using questionnaires. Multiple regression analysis was conducted to test the hypotheses. The results showed both extrinsic and intrinsic reward are the factors influencing retaining Gen Y in manufacturing companies. The discussion on the analysis, limitation of the study, recommendation for future research and conclusion were discussed at the end of this study. In a nutshell, it was proven extrinsic reward and intrinsic reward has contributed to the retention of Gen Y employees.

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