Dynamic response of a two degree of freedom spherical system in a fluid

1967 ◽  
Vol 35 (6) ◽  
pp. 351-361 ◽  
Author(s):  
J. F. Carney ◽  
L. F. Mockros ◽  
S. L. Lee
Keyword(s):  
Dynamic Response ◽  
Degree Of Freedom ◽  
Spherical System ◽  
Two Degree Of Freedom

Synthesis of a Geared N-Bar Linkage

1971 ◽  
Vol 93 (1) ◽  
pp. 157-164 ◽  
Author(s):  
A. D. Dimarogonas ◽  
G. N. Sandor ◽  
A. G. Erdman
Keyword(s):  
Dynamic Response ◽  
Computer Program ◽  
Structural Characteristics ◽  
Degree Of Freedom ◽  
Complex Numbers ◽  
Function Generator ◽  
Matrix Methods ◽  
Loop Function ◽  
Function Generators ◽  
Two Degree Of Freedom

For certain tasks, four-bar linkages may not provide needed accuracy and/or structural characteristics. To overcome this, one or more bars may be added to the coupler with geared pairs to maintain a “one-degree-of-freedom” system. Utilizing complex numbers and matrix methods, a general geared n-bar function generator is developed in this paper. The computer program devised synthesizes four-bar linkages to approximate the desired function and increases the number of links by one if specifications for accuracy and other requirements are not met. Synthesized linkages are analyzed and then optimized by way of minimizing a multidimensional objective function. As a practical illustration of the n-bar theory, geared five-bar, one-loop function generators are designed to simulate the dynamic response of a two-degree-of-freedom vibrating system.

Modeling and Dynamic Response of Maglev Vehicles Subjected to Crosswind Gusts

1981 ◽  
Vol 103 (3) ◽  
pp. 251-258 ◽  
Author(s):  
D. P. Garg ◽  
T. M. Barrows
Keyword(s):  
Dynamic Response ◽  
Computer Simulations ◽  
Finite Length ◽  
Analytical Techniques ◽  
Degree Of Freedom ◽  
Apparent Mass ◽  
Wind Gusts ◽  
Lateral Forces ◽  
Mass Factor ◽  
Two Degree Of Freedom

This paper presents a two-degree-of-freedom model for magnetically levitated finite-length vehicles incorporating sway and yaw dynamics. Aerodynamic lateral forces and yawing moments on the vehicle resulting from constant speed wind gusts are computed using analytical techniques. Computer simulations are run for three vehicle speeds and three apparent mass factors. It is shown that higher apparent mass factors can be instrumental in reducing peak displacements and acceleration levels. The guidance-to-lift ratio is not as much affected by an increase in apparent mass factor as are the displacements and accelerations.

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