Suspension Dynamics by Computer Simulation

1968 ◽  
Vol 90 (4) ◽  
pp. 708-715
Author(s):  
W. B. Diboll ◽  
H. S. Bieniecki
Keyword(s):  
Computer Simulation ◽  
Digital Computer ◽  
Total Mass ◽  
Analytical Study ◽  
Center Of Gravity ◽  
Degree Of Freedom ◽  
Design Parameters ◽  
Spring Stiffness ◽  
Suspension Dynamics ◽  
Six Degree Of Freedom

An analytical study of the effect of changing the design parameters of a two mass, six-degree-of-freedom suspension system was made. Rail cars with coil and air springs were analyzed by analog and digital computer. Spring stiffness, spring spacing, damping rates, height of center of gravity, and total mass were varied. The effect on frequency and response were determined.

Landing efficiency control of a six-degree-of-freedom aircraft model with magnetorheological dampers: Part 1—Modeling

2020 ◽  
pp. 1045389X2094257
Author(s):  
Byung-Hyuk Kang ◽  
Ji-Young Yoon ◽  
Gi-Woo Kim ◽  
Seung-Bok Choi
Keyword(s):  
Lagrange Equation ◽  
Degree Of Freedom ◽  
Magnetorheological Damper ◽  
Dynamic Equations ◽  
Design Parameters ◽  
Coordinate Frame ◽  
Aircraft Model ◽  
Efficiency Control ◽  
Six Degree Of Freedom ◽  
Principal Design

This work presents landing efficiency control of a six-degree-of-freedom aircraft model, which has a controllable landing gear system with magnetorheological damper. Due to lengthy contents, this work is divided into two parts. In Part 1, both the kinematic and dynamic equations of the six-degree-of-freedom aircraft model are derived. After determining the principal design parameters of magnetorheological damper based on commercial Beechcraft Baron B55 (passive oleo-strut type) damper, the kinematic equations are derived using the aircraft body coordinate frame and homogeneous coordinates of the reference frame, while the dynamic equations are derived using Euler–Lagrange equation to represent the heave, roll, and pitch motions of the aircraft model. In Part 2, the landing performance based on landing efficiencies is analyzed through the landing motions using various controllers.

A Finite-Element-Based Method to Determine the Spatial Stiffness Properties of a Notch Hinge

1998 ◽  
Vol 123 (1) ◽  
pp. 141-147 ◽  
Author(s):  
Shilong Zhang ◽  
Ernest D. Fasse
Keyword(s):  
Finite Element ◽  
Finite Element Methods ◽  
Joint Stiffness ◽  
Degree Of Freedom ◽  
Design Parameters ◽  
Single Degree Of Freedom ◽  
Single Degree ◽  
Stiffness Properties ◽  
Six Degree Of Freedom ◽  
Flexural Hinges

Notch hinges are flexural hinges used to make complex, precise mechanisms. They are typically modeled as single degree-of-freedom hinges with an associated joint stiffness. This is not adequate for all purposes. This paper computes the six degree-of-freedom stiffness properties of notch hinges using finite element methods. The results are parameterized in terms of meaningful design parameters.

Obtaining multi-loop pursuit-control pilot models from computer simulation

2008 ◽  
Vol 222 (2) ◽  
pp. 189-199 ◽  
Author(s):  
R A Hess
Keyword(s):  
Computer Simulation ◽  
Time Domain ◽  
Flight Control ◽  
Linear Models ◽  
Degree Of Freedom ◽  
Pilot Model ◽  
Pursuit Control ◽  
The Time Domain ◽  
Frequency Domain Techniques ◽  
Six Degree Of Freedom

A method for generating simplified pursuit-control pilot models for computer simulation of multi-axis flight control tasks has been developed. The method involves a sequential loop closure synthesis procedure for creating the pilot model and includes handling qualities estimation. The original model formulation previously reported in the literature used frequency-domain techniques, primarily Bode diagrams to select model gains. The present research demonstrates how similar results can be obtained in the time-domain. This latter approach is particularly useful when complex, non-linear aircraft models are being used. The time-domain approach is exercised in a six-degree of freedom rotorcraft control simulation and in a six-degree of freedom tailless fighter simulation, both involving linear models.

Kinematics and dynamics of a six-degree-of-freedom parallel manipulator with revolute legs

Robotica ◽  
1997 ◽  
Vol 15 (4) ◽  
pp. 385-394 ◽  
Author(s):  
Kourosh E. Zanganeh ◽  
Rosario Sinatra ◽  
Jorge Angeles
Keyword(s):  
Computer Simulation ◽  
Parallel Manipulator ◽  
Kinematic Model ◽  
Degree Of Freedom ◽  
Displacement Velocity ◽  
Kinematics And Dynamics ◽  
Cartesian Space ◽  
Moving Platforms ◽  
Proposed Model ◽  
Six Degree Of Freedom

This paper presents the kinematics and dynamics of a six-degree-of-freedom platform-type parallel manipulator with six revolute legs, i.e. each leg consists of two links that are connected by a revolute joint. Moreover, each leg is connected, in turn, to the base and moving platforms by means of universal and spherical joints, respectively. We first introduce a kinematic model for the manipulator under study. Then, this model is used to derive the kinematics relations of the manipulator at the displacement, velocity and acceleration levels. Based on the proposed model, we develop the dynamics equations of the manipulator using the method of the natural orthogonal complement. The implementation of the model is illustrated by computer simulation and numerical results are presented for a sample trajectory in the Cartesian space.

Computer simulation of automobile accidents ... a new research tool

SIMULATION ◽  
1968 ◽  
Vol 11 (1) ◽  
pp. 27-34 ◽  
Author(s):  
Raymond R. McHenry
Keyword(s):  
Mathematical Model ◽  
Computer Simulation ◽  
Digital Computer ◽  
Degree Of Freedom ◽  
Nonlinear Mathematical Model ◽  
Automobile Accidents ◽  
Irregular Terrain ◽  
Rear Impact ◽  
Energy Conversion Systems ◽  
New Research

Simulation programs are currently being developed by the Cornell Aeronautical Laboratory, Inc. (CAL) to implement analytical studies of the dynamics of automobile accidents. One CAL digital computer program simulates responses of the crash victim during a longitudinal collision (i.e., a frontal or rear impact). The eleven-degree-of-freedom non linear mathematical model is being used to evaluate the effects of belt-type restraints and energy absorption prop erties of vehicle interiors and structures. In another CAL research program, an eleven-degree-of- freedom nonlinear mathematical model of an automobile traversing irregular terrain and encountering obstacles has been formulated and programmed for a digital computer. This simulation provides an analytical means of evaluating existing and proposed roadside energy-conversion systems. The two simulation programs are described and their outputs are compared with experimental responses.

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