scholarly journals Inertial Force Coupling to Nonlinear Aeroelasticity of Flexible Wing Aircraft

2016 ◽  
Author(s):  
Nhan T. Nguyen ◽  
Eric Ting ◽  
Sonia Lebofsky
Keyword(s):  
Inertial Force ◽  
Nonlinear Aeroelasticity ◽  
Flexible Wing ◽  
Force Coupling

Effects of Gait Variations on Grip Force Coordination During Object Transport

2008 ◽  
Vol 100 (5) ◽  
pp. 2477-2485 ◽  
Author(s):  
Priska Gysin ◽  
Terry R. Kaminski ◽  
Chris J. Hass ◽  
Cécile E. Grobet ◽  
Andrew M. Gordon
Keyword(s):  
Grip Force ◽  
Gait Cycle ◽  
Time Window ◽  
Inertial Force ◽  
Step Length ◽  
Support Surface ◽  
Inertial Forces ◽  
Force Coupling ◽  
Temporal Coupling ◽  
Object Transport

In object transport during unimpeded locomotion, grip force is precisely timed and scaled to the regularly paced sinusoidal inertial force fluctuations. However, it is unknown whether this coupling is due to moment-to-moment predictions of upcoming inertial forces or a longer, generalized time estimate of regularly paced inertial forces generated during the normal gait cycle. Eight subjects transported a grip instrument during five walking conditions, four of which altered the gait cycle. The variations included changes in step length (taking a longer or shorter step) or stepping on and over a stable (predictable) or unstable (unpredictable support surface) obstacle within a series of baseline steps, which resulted in altered frequencies and magnitudes of the inertial forces exerted on the transported object. Except when stepping on the unstable obstacle, a tight temporal coupling between the grip and inertial forces was maintained across gait variations. Precision of this timing varied slightly within the time window for anticipatory grip force control possibly due to increased attention demands related to some of the step alterations. Furthermore, subjects anticipated variations in inertial force when the gait cycle was altered with increases or decreases in grip force, relative to the level of the inertial force peaks. Overall the maintenance of force coupling and scaling across predictable walking conditions suggests that the CNS is able to anticipate changes in inertial forces generated by gait variations and to efficiently predict the grip force needed to maintain object stability on a moment-to-moment basis.

A High Immersive Telexistence System of the Moving Object with Full Circumference Image and Inertial Force Presentation

2017 ◽  
Vol 137 (9) ◽  
pp. 1192-1200
Author(s):  
Tatsuya Hayakawa ◽  
Daijiro Yoshimura ◽  
Mitsuyuki Saito ◽  
Yasuhide Kobayashi ◽  
Wataru Wakita
Keyword(s):  
Inertial Force ◽  
Moving Object

SAFE LOADING ON THE FOUNDATION OF CONSTRUCTIONS SUBJECT TO SEISMIC INERTIAL FORCE

2019 ◽  
Vol 9 (5) ◽  
pp. 56-62
Author(s):  
Khayat Rasulov ◽  
◽  
Rustam Rasulov ◽  
Mansurbek Babajanov
Keyword(s):  
Inertial Force ◽  
Safe Loading

scholarly journals Inertial property of oscillatory flow for pulse injection in porous media

2021 ◽  
pp. 014459872199978
Author(s):  
Bingyu Ji ◽  
Yingfu He ◽  
Yongqiang Tang ◽  
Shu Yang
Keyword(s):  
Capillary Number ◽  
Pressure Pulse ◽  
Two Phase Flow ◽  
Inertial Force ◽  
Inertia Force ◽  
Phase Flow ◽  
High Permeability ◽  
Two Phase ◽  
Apparent Permeability ◽  
Inertial Property

The low-frequency pulse wave makes the velocity of the fluid in the reservoir fluctuate dramatically, which results in a remarkable inertia force. The Darcy’s law was inapplicable to the pulse flow with strong effect of inertial force. In this paper, the non-Darcy flow equation and the calculation method of capillary number of pressure pulse displacement are established. The pressure pulse experiments of single-phase and two- phase flow are carried out. The results show that the periodic change of velocity can decrease the seepage resistance and enhance apparent permeability by generating the inertial force. The higher the pulse frequency improves the apparent permeability by enhancing influence of inertial force. The increase of apparent permeability of high permeability core is larger than that of low permeability core, which indicates that inertial force is more prominent in high permeability reservoir. For the water-oil two-phase flow, inertia force makes the relative permeability curve move towards right, and the equal permeability point becomes higher. In other words, with the increase of capillary number, part of residual oil is activated, and the displacement efficiency is improved.

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