scholarly journals Transformation of Gear Inter-Teeth Forces into Acceleration and Velocity

1999 ◽  
Vol 5 (3) ◽  
pp. 203-218 ◽  
Author(s):  
Walter Bartelmus
Keyword(s):  
Computer Simulation ◽  
Mathematical Modelling ◽  
Computer Simulations ◽  
Production Technology ◽  
Vibration Acceleration ◽  
Acceleration Signal ◽  
Field Practice ◽  
Design Production ◽  
Extended Interpretation

The paper deals with mathematical modelling and computer simulation of a gearbox system. Results of computer simulation show new possibilities of extended interpretation of a diagnostic acceleration signal if signal is obtained by synchronous summation. Four groups of factors: design, production technology, operation, change of gear condition are discussed. Results of computer simulations give the relation between inter-teeth forces and vibration (acceleration, velocity). Some results of computer simulations are referred to the results obtained in rig measurements and in field practice. The paper shows a way of increasing the expert's knowledge on the diagnostic signal, which is generated by a gearbox system, on a base of mathematical modelling and computer simulation.

Computer simulations of absorption and scattering

1986 ◽  
Vol 64 (8) ◽  
pp. 993-997 ◽  
Author(s):  
A. Bruce Langdon
Keyword(s):  
Computer Simulation ◽  
Mathematical Modelling ◽  
Computer Simulations ◽  
Laser Light ◽  
Inertial Confinement ◽  
Particle In Cell ◽  
Cell Simulation ◽  
External Sources ◽  
Principal Tool ◽  
Current Densities

This paper discusses computer simulation of absorption and scattering of laser light, under conditions relevant to laboratory achievement of thermonuclear fusion by laser-driven inertial-confinement methods. We enumerate the principal absorption and scattering processes and their requirements for accurate mathematical modelling. The principal tool, so-called particle-in-cell simulation, tracks particles through electromagnetic fields calculated self-consistently from the charge and current densities of the particles themselves, external sources, and boundaries. Many references are given. Special attention is given to two-plasmon decay.

A Computer Simulation Approach for Engineering Air-Jet Spun Yarns

1997 ◽  
Vol 67 (3) ◽  
pp. 223-230 ◽  
Author(s):  
Rangaswamy Rajamanickam ◽  
Steven M. Hansen ◽  
Sundaresan Jayaraman
Keyword(s):  
Computer Simulation ◽  
Computer Simulations ◽  
Fiber Length ◽  
Experimental Investigations ◽  
Simulation Approach ◽  
Air Jet ◽  
Fiber Fineness ◽  
Spun Yarns ◽  
Yarn Count ◽  
Wrap Angle

A computer simulation approach for engineering air-jet spun yarns is proposed, and the advantages of computer simulations over experimental investigations and stand-alone mathematical models are discussed. Interactions of the following factors in air-jet spun yarns are analyzed using computer simulations: yarn count and fiber fineness, fiber tenacity and fiber friction, fiber length and fiber friction, and number of wrapper fibers and wrap angle. Based on the results of these simulations, yarn engineering approaches to optimize strength are suggested.

Computer Simulation of an Synthetic Ultraviolet Absorbent in the Interface of DMB and DMF

2010 ◽  
Vol 146-147 ◽  
pp. 966-971
Author(s):  
Qi Hua Jiang ◽  
Hai Dong Zhang ◽  
Bin Xiang ◽  
Hai Yun He ◽  
Ping Deng
Keyword(s):  
Computer Simulation ◽  
Computer Simulations ◽  
Density Functional ◽  
Density Functional Method ◽  
Mean Field ◽  
Functional Method ◽  
Dynamic Density ◽  
Interface Phase ◽  
Simulation Results

This work studies the aggregation of an synthetic ultraviolet absorbent, named 2-hydroxy-4-perfluoroheptanoate-benzophenone (HPFHBP), in the interface between two solvents which can not completely dissolve each other. The aggregation is studied by computer simulations based on a dynamic density functional method and mean-field interactions, which are implemented in the MesoDyn module and Blend module of Material Studios. The simulation results show that the synthetic ultraviolet absorbent diffuse to the interface phase and the concentration in the interface phase is greater than it in the solvents phase.

Study on Neural Networks Usage to Analyse Correlation between Spectrum of Vibration Acceleration Signal from Pin of Ball Mill and its Filling Level

2015 ◽  
Vol 770 ◽  
pp. 540-546 ◽  
Author(s):  
Yuri Eremenko ◽  
Dmitry Poleshchenko ◽  
Anton Glushchenko
Keyword(s):  
Neural Network ◽  
Ball Mill ◽  
Signal Amplitude ◽  
Signal Spectrum ◽  
Laboratory Model ◽  
Training Set ◽  
Vibration Acceleration ◽  
Acceleration Signal ◽  
The Neural Network ◽  
Trained Neural Network

The question about modern intelligent information processing methods usage for a ball mill filling level evaluation is considered. Vibration acceleration signal has been measured on a mill laboratory model for that purpose. It is made with accelerometer attached to a mill pin. The conclusion is made that mill filling level can not be measured with the help of such signal amplitude only. So this signal spectrum processed by a neural network is used. A training set for the neural network is formed with the help of spectral analysis methods. Trained neural network is able to find the correlation between mill pin vibration acceleration signal and mill filling level. Test set is formed from the data which is not included into the training set. This set is used in order to evaluate the network ability to evaluate the mill filling degree. The neural network guarantees no more than 7% error in the evaluation of mill filling level.

scholarly journals Air Temperature Control System in a Building on the Basis of Mathematical Modelling

2018 ◽  
Vol 155 ◽  
pp. 01041 ◽  
Author(s):  
Aleksandr Pilipenko ◽  
Sergei Petrov
Keyword(s):  
Computer Simulation ◽  
Control System ◽  
Mathematical Modelling ◽  
Mathematical Models ◽  
Air Temperature ◽  
Temperature Control ◽  
Automated System ◽  
Temperature Control System ◽  
Heating Systems ◽  
The Cost

In the article the authors solve a crucial objective of reducing the cost of heating services through the introduction of a system, controlling boilers and heating devices, based on modelling of the building and predicting heating systems functioning and operation. The authors describe the method of mathematical modelling of heating systems of the building and represent the developed mathematical models, pledged and installed into the developed automated system. The authors have offered an automated system of dispatch control of the boilers with the elements of computer simulation and modelling.

Computer Simulation Studies of Fracture in Vitreous Silica

2002 ◽  
Vol 731 ◽  
Author(s):  
Romulo Ochoa ◽  
Michael Arief ◽  
Joseph H. Simmons
Keyword(s):  
Molecular Dynamics ◽  
Computer Simulation ◽  
Computer Simulations ◽  
Silica Glass ◽  
Vitreous Silica ◽  
Uniaxial Strain ◽  
Force Function ◽  
Simulation Studies ◽  
Previous Fracture ◽  
Computer Simulation Studies

AbstractWe conduct molecular dynamics computer simulations of fracture in silica glass using the van Beest, Kramer, and van Santen model. Stress is applied by uniaxial strain at different pulling rates. Comparisons with previous fracture simulations of silica that used the Soules force function are presented. We find that in both models stress is relieved by rotation of the (SiO4)-2 tetrahedrons, increasing Si-O-Si bonding angles, and only small changes in the tetrahedron dimensions and O-Si-O angles.

scholarly journals Quaternary regenerative CMOS logic circuits with high-impedance output state

2005 ◽  
Vol 18 (3) ◽  
pp. 505-514
Author(s):  
Dusanka Bundalo ◽  
Branimir Ðordjevic ◽  
Zlatko Bundalo
Keyword(s):  
Computer Simulation ◽  
Computer Simulations ◽  
Delay Time ◽  
Propagation Delay ◽  
Logic Circuits ◽  
Output State ◽  
High Impedance ◽  
Multiple Valued Logic ◽  
Propagation Delay Time ◽  
Simulation Results

Principles and possibilities of synthesis and design of quaternary multiple valued regenerative CMOS logic circuits with high-impedance output state are de- scribed and proposed in the paper. Two principles of synthesis and implementation of CMOS regenerative quaternary multiple-valued logic circuits with high-impedance output state are proposed and described: the simple circuits with smaller number of transistors, and the buffer/driver circuits with decreased propagation delay time. The schemes of such logic circuits are given and analyzed by computer simulations. Some of computer simulation results confirming descriptions and conclusions are also given in the paper.

Reciprocity Research and Its Implications for the Negotiation Process

1998 ◽  
Vol 3 (2) ◽  
pp. 151-169 ◽  
Author(s):  
◽  
Keyword(s):  
Computer Simulation ◽  
Empirical Research ◽  
Computer Simulations ◽  
Social Dilemma ◽  
Negotiation Process ◽  
Behavioral Research ◽  
Previous Trial ◽  
Behavioral Strategies ◽  
Social Scientists ◽  
Tit For Tat

AbstractWhile social scientists have discussed the issue of reciprocation for many years, much of current behavioral research stems from Robert Axelrod's computer simulations of behavioral strategies in prisoner's dilemma games. Axelrod showed that a tit-for-tat strategy – cooperate on the first trial, and thereafter behave as your opponent did on the previous trial – earned a higher average payoff than any other tested strategy. We review both the computer simulation and empirical research that followed his studies. We suggest that it would be fruitful to extend this research to the negotiation paradigm, for two reasons: (1) many of the findings have direct bearing on elements of the negotiation process, and (2) there are unique aspects of the negotiation process that pose interesting questions for social dilemma research.

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