What is Simulation: Definition and 880 Discussions
A simulation is the imitation of the operation of a real-world process or system over time. Simulations require the use of models; the model represents the key characteristics or behaviors of the selected system or process, whereas the simulation represents the evolution of the model over time. Often, computers are used to execute the simulation.
Simulation is used in many contexts, such as simulation of technology for performance tuning or optimizing, safety engineering, testing, training, education, and video games. Simulation is also used with scientific modelling of natural systems or human systems to gain insight into their functioning, as in economics. Simulation can be used to show the eventual real effects of alternative conditions and courses of action. Simulation is also used when the real system cannot be engaged, because it may not be accessible, or it may be dangerous or unacceptable to engage, or it is being designed but not yet built, or it may simply not exist.Key issues in modeling and simulation include the acquisition of valid sources of information about the relevant selection of key characteristics and behaviors used to build the model, the use of simplifying approximations and assumptions within the model, and fidelity and validity of the simulation outcomes. Procedures and protocols for model verification and validation are an ongoing field of academic study, refinement, research and development in simulations technology or practice, particularly in the work of computer simulation.
Trying to simulate leakage current, say from a reverse bias diode or even a dirty PCB. Getting funny results using the current source across the load. Anyone have any ideas. Basic voltage divider fed by CV source and a 1uA forward biased CC source across the VD tap.
By the way, I'm fairly new...
hello there I'm using comsol multiphysics acoustic module.
so:
1) acoustic model / pressure acoustics / time harmonic analysis
2) draw a circle and do boundaries (F7) = radiation condition (p=0) so this boundary absorbs all the acoustic pressure...
3) then made a mark in the middle and...
hello...
Can anyone tell me how can I simulate the laser rate equation with matlab? i allready wrote a code whics is as follows,
%have to write one editor
function dy=rate_equation(t,y)
dy = zeros(2,1);
I =50e-3;
%for t=1:10;
q =1.602e-19;
v =9e-11;
eps =3.4e-17;
N0 =1.8e-18...
In my high school Honors Chemistry course today, we performed a simulation (along with several real labs) of chemical (dynamic) equilibriums. I'll briefly outline the simulation:
1. Place 42 pennies on the reactants side and 0 on the products side.
2. In the first round, move 1/3 of the...
Homework Statement
Hello all, this is my first post here although I've used this site for referencing several times. My question is regarding an 8:1 multiplexer. I need to write a c program using just &&, || and ! to simulate each gate of an 8:1 mux. We have 3 control inputs and 8 source...
I mean, why there are so many speculations? It must be 'shut up and press enter' :)
For example, some people say that the second horizon in the Kerr black hole is not dangerous. Others claim that due to infinite concentration of energy there there is a real singularity there so everything...
Dear all,
I have some problems with a program called the simulation of laser interaction with materials. In this program, they asked for some parameters which I am unsure of but I believe it has something to do with space grid for simulating the thermal conduction. This is a 1D heat...
hi friends,
I'm going to simulate the spectrum of a specific ion, with constant situation (like: density, temperature and etc).
but I don't know what should I do first!
thanks for your help
:frown:
Hello,
I am attempting to build a single axis inverted pendulum using a PID system to keep the rod balanced. I am interested in writing a program to simulate the rod tipping over and the effects of moving the base (pivot point) left or right to counter the tipping effect. I can't quite...
Man, I just found this video on youtube and the 3D effect is absolutely amazing... imagine playing a 3D shooting game with that! Furthermore, the effect can be done with very low cost as demonstrated in the video...
here is the video
https://www.youtube.com/watch?v=Jd3-eiid-Uw
it is interesting i could not find many particle-particle simulators that simulate electrical fields even thought dynamics is pretty similar to that of planetary orbitals. there are few i could find but they are mostly 2D and defining problem in mathematical/geometrical terms, with sin/cos or...
I am attempting to simulate the 4017 chip in multisim but I am not getting the expected result. I doubt that multisim is incorrectly simulating the chip, so I think that I am probably just hooking it up incorrectly.
http://www.doctronics.co.uk/4017.htm"...
Greetings to all
I apologise if this has already come up before, I found many related topics on these forums but nothing dealing with my specific problem (providing it is due to a physics error and not a programming one).
I'm currently in the midst of programming the physics part of a...
I want to advect a surface using the fluid velocity using semi lagrangian advection.
The fluid is in a box, that is the fluid is surrounded by solid walls in 4 directions.
I applied "no slip boundary condition" for fluid and neuman boundary condition for pressure.
But the problem is that my...
Hi Guys,
I need to design something that will isolate our DAQ (Data Acquisition Card) for a basic simulation we need to do. I was thinking about designing a mosfet switch, where the DAQ sends some voltage to the gate above the threshold voltage to turn the MOSFET on and 0 V to turn it off...
Hi
Does someone have successful experience working with GNU/open source circuit simulation tools in Linux? I tried gEDA, but it did not work well for me.
If you've been successful in using such software, please write back with detailed experiences here. I use Microcap for my undergraduate...
Hi
I am working on a project to do a coil simulation using COMSOL to determine inductance and resistance variations with frequency. I have a CAD file for the geometry but I need help because I am having serious difficulties with the rest. Can anyone help pls?
thanks alot
Hi, I have a little problem. I recently got the nerve to try and teach myself all of the physical properties necessary to program a physics engine (the insomnia is a DIFFERENT problem). It's going much better than I could've hoped (considering I started a few days ago). My knowledge of physics...
Homework Statement
http://img399.imageshack.us/img399/4277/cartyf8.jpg
http://g.imageshack.us/img399/cartyf8.jpg/1/ Homework Equations
Euler's Method, Runge Kutta 4th Order Method
The Attempt at a Solution
I have solved the motion equation for the above question using Euler's Method and...
Hello,
I am trying to implement a simple simulation of a point mass connected to a linear and to an angular spring. I thought this would be very easy, basically just integrating these two equations:
mr''=-k_l(r-L)-c_lr'
m\theta''=-k_a(\theta-\alpha)-c_a\theta'
These are in polar...
Hi,
I wonder if there is a Density Functional Theory or Hartree-Fock Theory based atomistic simulator that can be used to simulate nanoelectronic devices for example nano-scale field effect transistors?
I looked at the documentations of SIESTA and other DFT software listed at...
hi,
I am preety new in this field so I need some help about Comsol sw.
I would like to perform a simulation but as I am not a physicist I have no idea how to. So, if anyone can help me, I would be very happy.
OK. I would like to simulate the drop of liquid(water) which falls into a liquid...
Does anyone know how to simulate the pulse laser drilling?
I am trying to use Comsol or MATLAB to simulate the laser interaction with a specified piece of material.
Following, plot the time (X axis) versus temperature (Y axis) diagram
to see the temperature distribution.
Any help in...
Hi,
I am a computer science student in my final year, and preparing myself for my graduation project (GP).
Please check this video:
http://www.youtube.com/watch?v=d7eGypGOlOc"
This program is from MIT and it is called "A Shrewd Sketch Interpretation and Simulation Tool".
I am planning...
I have a simple circuit 2v supply R and Diode in Pspice that I'm trying to run a simulation on. I get the following message.
"This action cannot be completed because the other program is busy. Choose 'Switch To' to activate the busy program and correct the problem."
I have no idea what the...
Hi everyone,
Does anyone know what simulation software to learn fundamentals of fluid mechanics for beginner student of mechanical engineering like I can create it by my own?
Thanks in advance
Huygen
I posted this topic in a physics forum on another web site, but I thought this forum might be a better place to get good answers.
So the other week, I tried writing an applet (using the new Javascript Canvas Firefox now supports) to simulate a thought experiment I use to explain the basics of...
Hi to all,
I've been around this forum for some time now, but this is the first time I actually registered in need to ask you for some help to crack this. I've seen some great minds who surely could give me some lights. Thanks to all :)
Homework Statement
So, um trying to create a numerical...
I am looking for a way to evolve a wave function in one dimension. I tried searching already but couldn't find anything. Basically I have:
V[x] gives the potential at x
Psi0[x] gives initial conditions on wave function for each x
I would like to calculate Psi[t,x], the wave function at...
So I have been further researching possible career paths with a degree in math that would suit me, and I came across the idea of modeling and simulation for national defense (for example...
Hi, Everyone.
I am new to electronics in general so I have a rather uninformed question. It seems that a lot of circuits out there are presented "as is" without necessary mathematical calculations. When I took my physics, we were taught KCL, KVL, RLC etc. I enjoy deriving circuit behavior...
I'm working on a simulation for ballistics, and I am in dire need of some help with elasticity. It is primarily to be used in bullet penetration. Given the impact velocity (v := m/s), impact energy (E := J), and cross-sectional area (A := m^{2}) of a bullet, and the strength(s) of the material...
[SOLVED] RK4 in solar system simulation (n-body problem)
Hi, I'm making a simulation of the solar system and have so far been using euler's method to integrate my equations of motion - and i'd like to upgrade to a 4th order runge-kutta method.
I'm having a lot of trouble understanding the...
Hi,
I'm making a car simulation game not just a simple one, one that closely matches the kinds of Gran Turismo, therefore, it has to be extremely precise and realistic and use real life physics.
I have been searching around for information regarding this subject and was able to get some...
Anyone know some decent free software for simulating microwaves in full detail? Ideally I'd like to input autocad drawings to it, of metallic structures, and see the power distribution in 3D.
Hey all, I'm looking for some suggestions on topics concerning Molecular Simulation which I can research. I've been tasked with giving a talk and writing a report on one specific topic of this field but I'm unsure what to specialise in. Any and all advise and suggestions would be appreciated!
Similar to Interactive Physics 2005 but "better". I never said I would purchase/download an unlicensed copy so mods there is no need to delete this topic.
hi,
srr if this isn't the wright place to post this...
I'm working on engine (i'm a programer , c++) and I'm stuck at bouncing...
I have an object (repressented by a sphere) at an unknow hight, with an unknow mass and I drop it, so gravity does it job and it starts to fall down
now...
Hi!
Does anybody here have experience with the FEMM simulation software? Its pretty popular in the engg community. I basically use it for simulating magnetostatic problems.
If you do (and if this is the right forum, it is EE after all), could somebody tell me how I can do transient...
Let \bold{X} be a discrete random variable whose set of possible values is \bold{x}_j, \ j \geq 1 . Let the probability mass function of \bold{X} be given by P \{\bold{X} = \bold{x}_j \}, \ j \geq 1 , and suppose we are interested in calculating \theta = E[h(\bold{X})] =...
Caveat 1: I'm not sure if this message should be posted here, or in the Programming forum.
Caveat 2: I have a BS in Physics, obtained more than a decade ago, but never actually worked in the field. So I'm a bit rusty. :redface: OK, more than a bit.
I am writing a program to simulate the...
Hey everyone,
I'm knocking my head against something and for some reason I can't get it to work out -- I'm running an N-body simulation which uses an internal gravitational constant of 1, meaning that the timestep used is a function of the units of mass, length, and velocity.
But I don't know...
Let's assume we live in a simulation, but for whatever reason the physics of it are not modeled perfectly. Perhaps the computing power is insufficient to reproduce everything with 100% accuracy. Let's say that as you look at smaller and smaller things, the simulation begins to give...
List here all the free physics simulation programs. I am trying to find particle physics simulation programs, plasma and fusion physics simulation programs and magnetic and electric field simulation programs. What program should I use to simulate...
Incompressible Fluid simulation - SPH doesn't work :(
Hello all,
I've been stuck in my project: Fluid Simulation using Smoothed Particle Hydrodynamics for a few days now.
I do understand the core principle that fluid properties are calculated by integration on kernel W with range h. But...
Hi every body
I really need to learn about panel methods in aerodynamics
Can anyone help me on this ?
Some guides and especially a simple code about this method can be very helpful for me
I appreciate your time and consideration
my E-mail is casy_sms@yahoo.com
with regards
im currently looking for ping pong physics simulation in the web for my research.. i can't seem to find any which are useful..
im lookin for those that includes how the collision detection and modeling was handled, prog lang used, and graphics API for rendering(most i see are OpenGL), and the...
I have got this circuit.
http://img225.imageshack.us/img225/4369/circuithf1.jpg
Threshold voltage of the n-channel MOSFET is 2Volts. RVAR varies from 0.5k\Omega to 2k\Omega.
When I simulate the circuit, I get:
http://img132.imageshack.us/img132/2779/simulationuw4.jpg
It should go into...