scholarly journals A Proposal of Potentially Meaningful Material for Teaching of Vector Mechanics

2014 ◽  
Vol 05 (22) ◽  
pp. 1929-1935 ◽  
Author(s):  
Bruno Nunes Myrrha Ribeiro ◽  
Carlos Vitor de Alencar Carvalho
Keyword(s):  
Meaningful Material ◽  
Vector Mechanics

scholarly journals Modeling and Analysis of a Generic Internal Cargo Airdrop System for a Tandem Helicopter

2021 ◽  
Vol 11 (11) ◽  
pp. 5109
Author(s):  
Guozhi Li ◽  
Yihua Cao ◽  
Maosheng Wang
Keyword(s):  
Nonlinear Dynamics ◽  
Flight Dynamics ◽  
Simulation Method ◽  
Rotational Dynamics ◽  
Discretization Method ◽  
Modeling And Analysis ◽  
Flight Velocity ◽  
Vector Mechanics ◽  
Good Attitude

This article describes the results of modeling and analysis of a generic internal cargo system using a discretization method of the vector mechanics. The model can be easily incorporated into a tandem helicopter model and is intended for use of simulation and investigating the problems of flight dynamics, control, etc., both in flight operation loading a cargo and flight operation in the process of airdrops. The model is derived by considering the main descriptions of the cargo, including the linear and rotational dynamics, the kinematics, and the forces and moments acting on the helicopter. A simulation method embedded with a numerical trim algorithm is developed for the complete coupling helicopter/cargo nonlinear dynamics system. The simulation application of the model is illustrated, including the case of flight operation loading a cargo by considering three mass configurations of 3000, 4500, and 6000 kg, and the case of flight operation in the process of airdrops at velocities of 0, 40, 80, 120, and 160 knots. Stabilities of the helicopter in the process of airdrops are also analyzed. The major conclusions drawn are: (i) the tandem helicopter has a good attitude maintaining ability in the whole flight velocity envelope when it conducts a flight operation loading a cargo; (ii) in the process of airdrops, the increase in flight velocity will constantly decrease the helicopter pitching attitude and increases the total airdrop time and decreases the backward moving velocity of the cargo, and helicopter flying at a velocity between 80 and 120 knots might be acceptable; (iii) the stabilities of both the longitudinal and lateral periodic modes are continuing to decrease during the backward movement of the cargo.

Modeling the Inflation Response of C57BL/6 Mouse Sclera

2011 ◽  
Author(s):  
Kristin M. Myers ◽  
Thao D. Nguyen
Keyword(s):  
Material Properties ◽  
Soft Tissues ◽  
Ganglion Cells ◽  
The United States ◽  
Small Rodent ◽  
Tissue Samples ◽  
Tissue Microstructure ◽  
Material Parameters ◽  
Meaningful Material

Small rodent models have become increasingly useful to investigate how the mechanical properties of soft tissues may influence disease development. These animal models allow access to aged, diseased, or genetically-altered tissue samples, and through comparisons with wild-type or normal tissue it can be explored how each of these variables influence tissue function. The challenges to deriving meaningful material parameters for these small tissue samples include designing physiologically-relevant mechanical testing protocols and interpreting the experimental load-displacement data in an appropriate constitutive framework to quantify material parameters. This study was motivated by determining the possible role of scleral material properties in the development of glaucomatous damage to the retinal ganglion cells (RGC). Glaucoma is one of the leading causes of blindness in the United States and in the world with an estimate of 60 million people affected by this year [1]. Through exploring mouse models, the overall goal of our work is to determine the role of scleral material properties and scleral tissue microstructure in the pathogenesis of glaucoma.

scholarly journals Computational Vector Mechanics in Atmospheric and Climate Modeling

10.5772/65009 ◽  
2016 ◽  
Author(s):  
James Williams ◽  
Britton Landry ◽  
Matthew Mogensen ◽  
T.V. Hromadka
Keyword(s):  
Climate Modeling ◽  
Vector Mechanics

scholarly journals Heavy Military Land Vehicle Mass Properties Estimation Using Hoisting and Pendulum Motion Method

2019 ◽  
Vol 69 (6) ◽  
pp. 550-556
Author(s):  
M. S. Risby ◽  
Khalis Suhaimi ◽  
Tan Kean Sheng ◽  
Arif Syafiq M. S. ◽  
Mohd Hafizi N
Keyword(s):  
Centre Of Gravity ◽  
Mass Moment ◽  
Mass Properties ◽  
Proper Mass ◽  
Vehicle Rollover ◽  
Mass Moment Of Inertia ◽  
Mobile Crane ◽  
Vector Mechanics ◽  
Rollover Crash ◽  
Modelling Process

Mass properties such as the centre of gravity location, moments of inertia, and total mass are of great importance for vehicle stability studies and deployment. Certain parameters are required when these vehicles need to be arranged inside an aircraft for the carrier to achieve proper mass balance and stability during a flight. These parameters are also important for the design and modelling process of vehicle rollover crash studies. In this study, the mass properties of a military armoured vehicle were estimated using hoisting and pendulum method. The gross total weight, longitudinal and vertical measurements were recorded by lifting the vehicle using a mobile crane and the data were used to estimate the centre of gravity. The frequency of vehicle oscillation was measured by applying swing motion with a small angle of the vehicle as it is suspended on air. The centre of gravity and mass moment of inertia were calculated using the vector mechanics approach. The outcomes and limitations of the approach as discussed in details.

Simulation models for flexible spinning bodies

SIMULATION ◽  
1969 ◽  
Vol 12 (6) ◽  
pp. 291-296 ◽  
Author(s):  
Dara Childs
Keyword(s):  
Simulation Model ◽  
Final Section ◽  
Simulation Models ◽  
Theory Of Elasticity ◽  
Small Deflection ◽  
Spinning Bodies ◽  
Turbine Rotors ◽  
Vector Mechanics

The objective of the analysis which follows is the deriva tion of simulation models for flexible spinning bodies. The analysis employed is based on relatively simple con cepts of vector mechanics and results in a lumped-param eter simulation model. The simulation models which are first derived are subsequently simplified by invoking the small deflection assumptions of the theory of elasticity. A final section deals with some analysis steps used in adapting the basic simulation model for the description of turbine rotors.

The Effect of Overlearning on Transfer of Training

1965 ◽  
Vol 17 (2) ◽  
pp. 178-180
Author(s):  
Stephen Holborn ◽  
Erling E. Boe
Keyword(s):  
Reversal Learning ◽  
Transfer Of Training ◽  
Negative Transfer ◽  
Paired Associate ◽  
Paired Associate Learning ◽  
Positive Transfer ◽  
Criterion Group ◽  
Associate Learning ◽  
Meaningful Material ◽  
Rate Of Learning

The effect of overlearning on transfer of training on the A-B:A-Br* paradigm was studied in paired-associate learning with meaningful material (adjective pairs). One group of subjects was trained to criterion on list A-B, and two additional groups were given 100 per cent and 200 per cent overlearning on list A-B. Rate of learning list A-Br was found to be directly related to amount of overlearning. Negative transfer on list A-Br was found for errors with the criterion group, while positive transfer was found for the 100 per cent and 200 per cent overlearning groups. The results were consistent with previous paired-associate experiments, and with results of some maze, reversal learning experiments with infrahuman subjects.

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