Development of an automatic HF communications system using computer simulation as a design tool

1997 ◽  
Author(s):  
C.P. McSweeney
Keyword(s):  
Computer Simulation ◽  
Design Tool ◽  
Hf Communications ◽  
Communications System

Rule of Thumb Modelling of Biofilm Reactors

1990 ◽  
Vol 22 (1-2) ◽  
pp. 405-418 ◽  
Author(s):  
S. Elmaleh
Keyword(s):  
Experimental Data ◽  
Computer Simulation ◽  
Complex Systems ◽  
Flow Pattern ◽  
Zero Order ◽  
Design Tool ◽  
Rule Of Thumb ◽  
Biofilm Reactors ◽  
Number Of Species ◽  
Operational Variables

Biofilm reactors are very complex systems, the modelling of which requires sophisticated kinetic relationships concerning the highest number of species in reaction and computer simulation. In fact, the process engineer needs a rule of thumb method able to predict the output variables after modification of the operational variables. Such a “simplissime” model is derived by considering a plate reactor coated with a biofilm through which the substrates are diffusion transported and eliminated with a zero order intrinsic reaction. When the liquid-biofilm resistance is neglected, conversion depends on one parameter only, the meaning of which can be displayed. Moreover, in many cases, the flow pattern influence can be neglected. This “simplissime” model was shown accurate enough in fitting various experimental data and it can even be used as a design tool.

scholarly journals Hybrid electric vehicle drives fitted with combustion engines

2009 ◽  
Vol 136 (1) ◽  
pp. 19-30
Author(s):  
Antoni SZUMANOWSKI
Keyword(s):  
Computer Simulation ◽  
Electric Vehicle ◽  
Hybrid Electric Vehicle ◽  
Degrees Of Freedom ◽  
Internal Combustion Engines ◽  
Design Tool ◽  
Combustion Engines ◽  
Hybrid Drive ◽  
Special Stress ◽  
Planetary Transmission

Two generic types of hybrid drive fitted with Internal Combustion Engines (ICE) have been considered. The first type is a serial one. The second type is a parallel drive system represented by two subtypes: a compact hybrid drive with two degrees of freedom planetary transmission and a split-sectional drive. Based on example hybrid drives for city buses, a computer simulation is an appropriate method as a design tool. Special stress has been put on the compact hybrid drive with a planetary transmission, which seems to be the most advantageous. A serial hybrid drive has also been discussed in detail because currently this solution is the most common one applied in contemporary hybrid buses.

Validation of a computer simulation of the impact performance of a wire rope safety fence

2007 ◽  
Vol 221 (12) ◽  
pp. 1557-1570 ◽  
Author(s):  
M B Bateman ◽  
I C Howard ◽  
A R Johnson ◽  
J M Walton
Keyword(s):  
Computer Simulation ◽  
Wire Rope ◽  
Design Tool ◽  
Research Association ◽  
Test Results ◽  
Impact Performance ◽  
Impact Tests ◽  
Motor Industry ◽  
The Uk ◽  
The Impact

A computer simulation has been developed at The University of Sheffield that predicts the impact performance of roadway wire rope safety fences. Effective use of this simulation for design, or other purposes, requires it to be validated by showing that the predicted vehicle motion and fence response closely represent that of the real system. Two distinct validation studies are described in the current paper. The first compares the major results of eight impact tests undertaken at the UK Motor Industry Research Association and a further four impact tests undertaken at the Swedish Road and Transport Research Institute with the simulation predictions. The close prediction of the test results validates the use of the simulation as a design tool for a range of fence designs and impact conditions. The second validation study compares, in detail, the test results and simulation prediction for a single test. This suggests that, if required, results may be improved further by considering suspension effects in the vehicle model, and by a better understanding of frictional effects at the rope-post and the rope-vehicle contacts.

Airport Automated People Mover Systems: Analysis with a Hybrid Computer Simulation Model

2000 ◽  
Vol 1703 (1) ◽  
pp. 45-57 ◽  
Author(s):  
Yi-Dar Lin ◽  
Antonio A. Trani
Keyword(s):  
Computer Simulation ◽  
Simulation Model ◽  
Discrete Event ◽  
General Purpose ◽  
Simulation Software ◽  
Design Tool ◽  
Design Parameters ◽  
Computer Simulation Model ◽  
Hybrid Computer ◽  
Hybrid Computer Simulation

Automated people movers (APMs) have become an attractive solution to mobility problems associated with large airport terminals. A hybrid computer simulation model (called APMSIM) that has been developed to simplify the operational analysis of airport APM systems is presented. Given an airport passenger demand function, along with various APM vehicle technology and airport terminal characteristics, the model estimates timevarying level-of-service characteristics of the terminal including queues and processing times. The model simulates the movement of individual passengers and APM vehicles in the system network. APMSIM constitutes a design tool for airport planners and designers for determination of the sensitivity of system performance for a range of APM design parameters, examination of the flexibility of an APM system under given operational policy and network configurations, and estimation of APM vehicle energy consumption on the basis of network constraints and system characteristics. The model is a hybrid discrete-event and continuous simulation model developed in EXTEND, a general-purpose simulation software.

NATURAL COMMUNICATIONS STUDY PHASE I, FEASIBILITY STUDY ON A RELIABLE POLAR HF COMMUNICATIONS SYSTEM

1963 ◽  
Author(s):  
Geoffrey E. Hill ◽  
Sidney M. Bennett ◽  
Claude J. Mazzola
Keyword(s):  
Phase I ◽  
Feasibility Study ◽  
Study Phase ◽  
Hf Communications ◽  
Communications System

scholarly journals The use of CAD applications in the design of shredders for polymers

2018 ◽  
Vol 157 ◽  
pp. 02027 ◽  
Author(s):  
Marek Macko ◽  
Krzysztof Tyszczuk ◽  
Grzegorz Śmigielski ◽  
Józef Flizikowski ◽  
Adam Mroziński
Keyword(s):  
Computer Simulation ◽  
Computer Aided Design ◽  
Structural Features ◽  
Design Guidelines ◽  
Design Tool ◽  
Food Engineering ◽  
Wide Range ◽  
Depth Analysis ◽  
Internal Properties ◽  
Aided Design

Computer-aided design is now the primary design tool, providing opportunities for improving project quality, allowing for in-depth analysis of the specific features of the solution. In the methodology, computer simulation applications were used. Computer simulation aims to reconstruct the course of the studied process from its mathematical model using a computer and to examine the influence of the environment (input signals) and the internal properties of the object (process parameters) on the characteristics of the object. In designing the shredder, in addition to the selection of structural features, it is also possible to perform strength and kinematic simulations, resulting in a higher quality of the target solution. The results of the simulation work presented in the paper indicate a wide range of possible applications - also in the field of food engineering and processing of polymers - eg shredder mechanisms. Particular attention has been paid to the reduction of energy consumed by the deformation of samples, eg by pre-compaction of sample before introduction to the working area of the shredder. It has been estimated that the gap between the rotating discs should be minimized. Establishing design guidelines has resulted in a number of concept designs.

Developmental Solar Thermal Receiver Studies for the White Cliffs Solar Thermal Power Plant

1997 ◽  
Vol 119 (1) ◽  
pp. 61-67 ◽  
Author(s):  
P. Bannister ◽  
I. F. Mayer
Keyword(s):  
Computer Simulation ◽  
Power Plant ◽  
Thermal Performance ◽  
Flux Distribution ◽  
Thermal Power ◽  
Design Tool ◽  
Solar Thermal ◽  
Solar Thermal Power ◽  
Performance Predictions ◽  
Good Agreement

The principal features of a computer simulation used as a design tool for solar thermal receivers for paraboloidal dish collectors are described. Performance predictions derived from this model are outlined and compared with experiments on two receiver designs testing the overall thermal performance and the flux distribution. It is shown that predicted performance is in good agreement and that the model is suitable for design purposes.

Characterization of Modulated Structure Through Structure Images and their Computer Simulation

1990 ◽  
Vol 48 (1) ◽  
pp. 70-71
Author(s):  
Kiyomichi Nakai ◽  
Yusuke Isobe ◽  
Chiken Kinoshita ◽  
Kazutoshi Shinohara
Keyword(s):  
Computer Simulation ◽  
High Resolution ◽  
Spherical Aberration ◽  
High Resolution Electron Microscopy ◽  
Basic Mechanism ◽  
Objective Lens ◽  
Specimen Thickness ◽  
Transmitted Beam ◽  
Modulated Structure ◽  
Resolution Electron

Induced spinodal decomposition under electron irradiation in a Ni-Au alloy has been investigated with respect to its basic mechanism and confirmed to be caused by the relaxation of coherent strain associated with modulated structure. Modulation of white-dots on structure images of modulated structure due to high-resolution electron microscopy is reduced with irradiation. In this paper the atom arrangement of the modulated structure is confirmed with computer simulation on the structure images, and the relaxation of the coherent strain is concluded to be due to the reduction of phase-modulation.Structure images of three-dimensional modulated structure along <100> were taken with the JEM-4000EX high-resolution electron microscope at the HVEM Laboratory, Kyushu University. The transmitted beam and four 200 reflections with their satellites from the modulated structure in an fee Ni-30.0at%Au alloy under illumination of 400keV electrons were used for the structure images under a condition of the spherical aberration constant of the objective lens, Cs = 1mm, the divergence of the beam, α = 3 × 10-4 rad, underfocus, Δf ≃ -50nm and specimen thickness, t ≃ 15nm. The CIHRTEM code was used for the simulation of the structure image.

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