scholarly journals A Method for the Determination of Center of Gravity during Manual Wheelchair Propulsion in Different Axle Positions

2007 ◽  
Vol 19 (1) ◽  
pp. 57-63 ◽  
Author(s):  
Sanae Asahara ◽  
Sumiko Yamamoto
Keyword(s):  
Center Of Gravity ◽  
Wheelchair Propulsion ◽  
Manual Wheelchair

Effect of increased load on scapular kinematics during manual wheelchair propulsion in individuals with paraplegia and tetraplegia

2012 ◽  
Vol 31 (2) ◽  
pp. 397-407 ◽  
Author(s):  
Shashank Raina ◽  
Jill L. McNitt-Gray ◽  
Sara Mulroy ◽  
Philip S. Requejo
Keyword(s):  
Wheelchair Propulsion ◽  
Manual Wheelchair ◽  
Scapular Kinematics

Experimental Determination of Horizontal Motion of Human Center of Gravity During Squatting

2011 ◽  
Vol 37 (6) ◽  
pp. 66-76
Author(s):  
G. Fekete ◽  
B.M. Csizmadia ◽  
M.A. Wahab ◽  
P.D. Baets
Keyword(s):  
Experimental Determination ◽  
Center Of Gravity ◽  
Horizontal Motion

Biomechanics of Manual Wheelchair Propulsion in Elderly

2002 ◽  
Vol 81 (2) ◽  
pp. 94-100 ◽  
Author(s):  
Rachid Aissaoui ◽  
Hossein Arabi ◽  
Michèle Lacoste ◽  
Vincent Zalzal ◽  
Jean Dansereau
Keyword(s):  
Wheelchair Propulsion ◽  
Manual Wheelchair

Comparison of selected methods for the determination of the center of gravity in surface mining machines

2017 ◽  
Vol 4 (5) ◽  
pp. 5877-5882 ◽  
Author(s):  
Pawel Maslak ◽  
Grzegorz Przybylek ◽  
Tadeusz Smolnicki
Keyword(s):  
Surface Mining ◽  
Center Of Gravity

New Methodology for the Determination of the Vertical Center of Gravity of In-Service Semisubmersibles: Proposal and Numerical Assessment

2017 ◽  
Vol 139 (4) ◽  
Author(s):  
Ivan N. Porciuncula ◽  
Claudio A. Rodríguez ◽  
Paulo T. T. Esperança
Keyword(s):  
Accurate Determination ◽  
Center Of Gravity ◽  
Practical Implementation ◽  
Numerical Assessment ◽  
Neutral Equilibrium ◽  
Inclination Angles ◽  
Numerical Tools ◽  
The Stability ◽  
Metacentric Height

Along its lifetime, an offshore unit is subjected to several equipment interventions. These modifications may include large conversions in loco that usually are not adequately documented. Hence, the accurate determination of the platform's center of gravity (KG) is not possible. For vessels with low metacentric height (GM), such as semisubmersibles, Classification Societies penalize the platform's KG, inhibiting the installation of new equipment until an accurate measurement of KG is provided, i.e., until an updated inclining test is performed. For an operating semisubmersible, the execution of this type of test is not an alternative because it implies in removing the vessel from its in-service location to sheltered waters. Relatively recently, some methods have been proposed for the estimation of KG for in-service vessels. However, as all of the methods depend on accurate measurements of inclination angles and, eventually, on numerical tools for the simulation of vessel dynamics onboard, they are not straightforward for practical implementation. The objective of the paper is to present a practical methodology for the experimental determination of KG, without the need of accurate measurements of inclinations and/or complex numerical simulations, but based on actual operations that can be performed onboard. Indeed, the proposed methodology relies on the search, identification, and execution of a neutral equilibrium condition where, for instance, KG = KM. The method is exemplified using actual data of a typical semisubmersible. The paper also numerically explores and discusses the stability of the platform under various conditions with unstable initial GM, as well as the effect of mooring and risers.

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