Advanced Computer Simulation Approaches for Soft Matter Sciences II








2012 ◽  
Vol 85 (4) ◽  
pp. 576-589 ◽  
Author(s):  
M. H. R. Ghoreishy ◽  
M. Rafei ◽  
G. Naderi

ABSTRACT A previously developed computer simulation technique was extended for the optimization of the molding time of a thick rubber article in which a commercial finite element code was employed in conjunction with an in-house developed subroutine. The kinetics of the rubber-curing reaction and the physical and thermal properties of the materials were determined using appropriate methods. The accuracy of the method was examined by comparison of the measured temperature profile with calculated data. Two cure simulations were carried out. First, the molding time was set to the actual time used in the manufacturing specification. Having checked the distribution of the state of the cure at the center of the rubber, the molding time was reduced to save time, reduce energy, and avoid the risk of overcure at the rubber surfaces. Based on the proposed molding time, a second simulation was performed. A comparison between the hardness of the rubber article made by the reduced molding time and the measured hardness on the article manufactured by the previous molding time showed that there was 5 shore A increase in the hardness, which confirmed the applicability of procedures used in this work.



Author(s):  
J Y Wong ◽  
J Preston-Thomas

The major features of a computer simulation model, NTVPM-85, designed for parametric analysis of tracked vehicle performance are presented. The application of the model to the evaluation of the effects on tractive performance of vehicle design and operational parameters and terrain characteristics is demonstrated. The model can be an extremely useful aid in the evaluation of competing designs and in the examination of the effects on performance of design modifications and operational environments.



Author(s):  
J Y Wong

This paper describes the results of a study of the effects of articulation joint configuration, suspension characteristics, location of the centre of gravity and initial track tension on the mobility of a two-unit, articulated tracked vehicle. The study was carried out using a comprehensive computer simulation model known as NTVPM-86. The results show that suspension characteristics, location of the centre of gravity and initial track tension have noticeable effects on the mobility of articulated tracked vehicles over marginal terrain, while the articulation joint angle has a less significant influence on vehicle performance. Locking the articulation joint between the two units of an articulated tracked vehicle usually causes a degradation of tractive performance. The approach to the optimization of the design of articulated tracked vehicles is demonstrated. It is shown that the simulation model NTVPM-86 can play a significant role in the optimization of articulated tracked vehicle design or in the evaluation of vehicle candidates for a given mission and environment.



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