Digital Computer Simulation of Railroad Freight Car Rocking

1968 ◽  
Vol 90 (4) ◽  
pp. 701-706 ◽  
Author(s):  
A. A. Liepins
Keyword(s):  
Mathematical Model ◽  
Computer Simulation ◽  
Computer Program ◽  
Digital Computer ◽  
Test Results ◽  
Model Response ◽  
Freight Car ◽  
Railroad Freight

A mathematical model for the simulation of railroad freight car rocking is presented. The equations of the model are developed into a digital computer program. The model response is validated by two series of test results, and the model is considered reliable for engineering predictions.

Experimental Verification of a Digital Computer Simulation Method for Predicting Gas Turbine Dynamic Behaviour

1972 ◽  
Vol 186 (1) ◽  
pp. 323-329 ◽  
Author(s):  
A. J. Fawke ◽  
H. I. H. Saravanamuttoo ◽  
M. Holmes
Keyword(s):  
Mathematical Model ◽  
Computer Simulation ◽  
Gas Turbine ◽  
Transient Response ◽  
Digital Computer ◽  
Dynamic Behaviour ◽  
Simulation Method ◽  
General Purpose ◽  
Test Results ◽  
Turbine Engine

A mathematical model which simulates the transient response of a twin-spool gas turbine engine on a general purpose digital computer is described together with test results verifying the simulation.

Dynamic Simulation of Freight Car and Lading During Impact

1977 ◽  
Vol 99 (4) ◽  
pp. 859-866 ◽  
Author(s):  
P. V. Kasbekar ◽  
V. K. Garg ◽  
G. C. Martin
Keyword(s):  
Mathematical Model ◽  
Computer Simulation ◽  
Dynamic Analysis ◽  
Dynamic Simulation ◽  
Parametric Study ◽  
Degrees Of Freedom ◽  
Impact Damage ◽  
Packaging Materials ◽  
Freight Car ◽  
Three Degrees Of Freedom

A dynamic analysis is presented to explain damage to railroad cars and ladings resulting from impacts. In the analysis, a mathematical model consisting of the car body and freight in the car is presented. Each freight element assumes three degrees of freedom for the computer simulation. A parametric study is made to establish sensitivity of car parameters and impact conditions. The study should be useful to aid in finding means for controlling impact damage and in designing packaging materials.

scholarly journals Application of High Bypass Turbofan Computer Simulation to Flight and Test Data Processing

1982 ◽  
Author(s):  
J. F. Chapier ◽  
L. Levine
Keyword(s):  
Computer Simulation ◽  
Computer Program ◽  
Simulation Model ◽  
Gas Turbine ◽  
Data Reduction ◽  
Engine Performance ◽  
Computer Simulation Model ◽  
Test Results ◽  
Static Test ◽  
Turbine Engine

This paper describes the computer program used to compare gas turbine engine flight and static test results with a predicted standard engine computer simulation model. The program is conceived not only for a final presentation of engine performance, but also as a research tool to further analyze the validity of measurements and the assumptions used in data reduction.

Computer simulation and parameter optimization of phase-locked loops (PLL)

SIMULATION ◽  
1971 ◽  
Vol 16 (2) ◽  
pp. 77-83
Author(s):  
Fred Ricci
Keyword(s):  
Mathematical Model ◽  
Computer Simulation ◽  
Automatic Control ◽  
Parameter Optimization ◽  
Digital Computer ◽  
Random Noise ◽  
Phase Locked Loops ◽  
Simulation Techniques ◽  
Performance Results ◽  
Computer Simulation Techniques

The automatic control and simulation of phased- locked loops (PLL) is treated with particular em phasis on the use of analog and digital computer simulation techniques. The object is to obtain an adequate mathematical model for the PLL and then to use this model to optimize parameters and investi gate pull-in performance. Results are presented for the second-order loop, with ramp, step, random noise, and sinusoidal inputs. The significant result is that an optimization of the PLL loop parameters is obtained using computer techniques.

Helical Gears With Involute Shaped Teeth: Geometry, Computer Simulation, Tooth Contact Analysis, and Stress Analysis

1988 ◽  
Vol 110 (4) ◽  
pp. 482-491 ◽  
Author(s):  
Chung-Biau Tsay
Keyword(s):  
Mathematical Model ◽  
Computer Simulation ◽  
Computer Program ◽  
Stress Analysis ◽  
Contact Analysis ◽  
Tooth Contact Analysis ◽  
Tooth Contact ◽  
Helical Gears ◽  
Bearing Contact ◽  
Kinematic Errors

The paper covers the solutions to the following problems: (1) Setting up a mathematical model for the involute helical gears; (2) Computer simulation of the conditions of meshing and bearing contact; (3) Investigation of the sensitivity of gears to the errors of manufacturing and assembly; and (4) Stress analysis of the gears. In this paper, the theory of gearing and the concept of differential geometry have been applied to deal with the relations of two mating helical gears and their bearing contact. Computer program for tooth contact analysis (T.C.A.) has been developed for the gears. The T.C.A. computer program makes it possible to simulate gear meshing and bearing contact, and to investigate the influence of gear misalignment on kinematic errors. A method of compensation for the dislocation of bearing contact and for kinematic errors induced by errors of manufacturing and assembly has been proposed. Four numerical examples have also been presented to illustrate the influence of the above-mentioned errors and the method of compensation for the dislocation of bearing contact. Based on the derived mathematical model, an automatic mesh generating computer program—AMG has been developed to define the geometry of the gears and to divide the gear tooth into elements as well as to generate nodal points automatically. The results of T.C.A. provide the locations and directions of the applied loadings for the finite element method (F.E.M.) stress analysis.

scholarly journals Simulation of the Maneuverability of Inland Waterway Tows

1978 ◽  
Vol 15 (01) ◽  
pp. 27-34
Author(s):  
George L. Petrie
Keyword(s):  
Mathematical Model ◽  
Computer Program ◽  
Digital Computer ◽  
Hydrodynamic Force ◽  
Control Algorithms ◽  
Inland Waterway ◽  
Potential Applications ◽  
The Mathematical Model

A mathematical model has been developed to simulate the motion of a barge and towboat flotilla maneuvering through an inland waterway channel. The formulation of the mathematical model, including the hydrodynamic force representations and the rudder and propeller control algorithms, and its implementation in a digital computer program are described. Potential applications for utilization of the model are discussed, and some typical results are given.

An Application of Jominy Test Results in Computer Simulation of Steel Quenching

2018 ◽  
Vol 941 ◽  
pp. 504-509
Author(s):  
Božo Smoljan ◽  
Dario Iljkić ◽  
Sunčana Hanza Smokvina ◽  
Luciano Gržinić ◽  
Milenko Jokić ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Mathematical Model ◽  
Computer Simulation ◽  
Computer Software ◽  
Numerical Procedure ◽  
Inversion Method ◽  
Test Results ◽  
Surface Heat Transfer Coefficient ◽  
Jominy Test ◽  
The Mathematical Model

The research purpose is to upgrade the mathematical modelling and computer simulation of quenching of steel. Based on theoretical analyze of physical processes which exist in quenching systems the mathematical model for steel quenching is established and computer software is developed. The mathematical model of steel quenching is focused on physical phenomena such as heat transfer, phase transformations, mechanical properties and generation of stresses and distortions. Physical properties that were included in the model, such as heat conductivity coefficient, heat capacity and surface heat transfer coefficient were obtained by the inversion method based on Jominy test results. The numerical procedure is based on finite volume method. By the developed algorithm, 3D situation problems such as the quenching of complex cylinders, cones, spheres, etc., can be simulated. The established model of steel quenching can be successfully applied in the practical usage of quenching.

Sign in / Sign up

Export Citation Format

Share Document