What is Modeling: Definition and 607 Discussions

A model is an informative representation of an object, person or system. The term originally denoted the plans of a building in late 16th-century English, and derived via French and Italian ultimately from Latin modulus, a measure.
Representational models can be broadly divided into the concrete (e.g. physical form) and the abstract (e.g. behavioural patterns, especially as expressed in mathematical form). Of particular importance in the modern context, conceptual models are central to philosophy of science, as almost every scientific theory effectively embeds some kind of model of the physical or human sphere.
In commerce, a model might instead reference a specific version or configuration of a product offering, rather than functioning as a representation of something else.
In taxonomic settings (e.g. biology, architecture, art) a model is sometimes a particular instance of a set of related entities (species, built structures, artistic compositions) chosen as a convenient reference point around which to build discourse; such a model is almost always chosen to typify some central tendency of the group, exemplify the group's defining characteristic, or reify the group's historical lineage.
Kinds of models include:

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  1. K

    Mathematical modeling of driveline impact test of an automobile

    I am in a process of making a mathematical model of an automobile driveline validation procedure called "Driveline impact". In this test, after the engine in cranked, first gear is selected. While clutch pedal is still pressed, engine rpm is raised unto its max. torque deliverable speed. In this...
  2. amare

    Throttle body modeling and simulation

    I modeled a throttle body in Simulink. How do I model the position of the gas pedal so that if the position of the gas pedal changes the input voltage to the throttle body actuator will change and open the throttle? why should i give on the left side to get position of the gas pedal from the...
  3. Andrea Vironda

    Modeling Hydraulic Brake Behavior

    Summary: Relation between deformed foil and friction force Good morning everyone, i have a small leaf or steel that is bent from one side by a Pressure of many bars. in front of the leaf there's a rotating disk, separated by the leaf by a small gap. this leaf, as it deforms, wins the gaps and...
  4. F

    Differential equation modeling glucose in a patient's body

    The rate at which glucose enters the bloodstream is ##r## units per minute so: ## \frac{dI}{dt} = r ## The rate at which it leaves the body is: ##\frac {dE}{dt} = -k Q(t) ## Then the rate at which the glucose in the body changes is: A) ## Q'(t) = \frac{dI}{dt} + \frac {dE}{dt} = r - k...
  5. W

    B Modeling Quickly Pushed Boxes: A Beginner's Guide

    I am a beginner to mechanics and am finding it very difficult to visualize/model what happens if I push a box quickly and let go. I know how to model the scenario when the box is continually pushed by a force. We simply use ##F=ma## where ##F## is the force. If the ground is rough, we also use...
  6. ChadThePianist

    COMSOL Modeling help (ambient air around a thermoelectric module)

    Hello everyone, I am wondering how to model ambient air around a thermoelectric module in COMSOL. I am fairly new to the software and am doing undergraduate research revolved around it. Any help or pertinent examples would be appreciated. I can send/post screenshots and or .mph files if it would...
  7. M

    Modeling torque on a half car model

    Imagine an half car model with the two suspension and two wheels. There is a torque applied to the rear wheels, that torque create the force between tire/asphalt that pull the car. How that torque react in the main body? I have two hypotesis: 1) It's only internal force that tend to bend the...
  8. PaxFinnica96

    Tank Change in Flow Process Modeling

    Hi All, I'm really struggling with the below question - I'm not sure if I've taken the correct approach to determining the model as there may be an easier way to do this? Any help in much appreciated, please let me know if I have submitted this template correctly as this if my first time...
  9. C

    MHB Vibrations of a Hanging Chain: Modeling Tension with PDEs

    Dear Everyone, I am having trouble with how to start with one part of the question: "In this exercise, we derived the PDE that models the vibrations of a hanging chain of length $L$. For convenience, the x-axis placed vertically with the positive direction pointing upward, and the fixed end...
  10. C

    Modeling reaction forces on a foundation for fences

    Hello new to the forum. I'm a builder by trade and enjoy studying the concepts behind the things I build. My problem is: A typical concrete post and base panel with a wooden fence. Unit mass approximately 350kgs including the foundation concrete around the posts. 2.0m wide x 2.0m above...
  11. G

    Modeling a mass hanging by a spring: motion in 3D time/freq domain

    Hello everyone, I am new here, and wondering if anyone would have some knowledge on a current problem I have been working on. I am trying to create time- and frequency domain 3D models of an object hanging using a spring from a fixed point within a shell. I am trying to figure out how the...
  12. HumanistEngineer

    Hydraulic Modeling of Central Heating Network

    In this task of mine, I need to develop a tool/software to carry out (dynamic) hydraulic analysis of a central heating network, formed with supply and return pipes so forming a multi-parallel loops in a closed circuit, as can be seen in the below picture. Can anyone suggest me some references...
  13. L

    Modeling the Driven Damped Oscillations in a Material

    Homework Statement [/B] Let us assume that neutral atoms or molecules can be modeled as harmonic oscillators in some cases. Then, the equation of the displacement between nucleus and electron cloud can be written as $$\mu\left(\frac{d^x}{dt^2}+\gamma\frac{dx}{dt}+\omega_0^2x\right)=qE.$$ where...
  14. M

    Alternative to MCNP for modeling alpha particles?

    I am a masters student in the UK. For my project I have to monitor the efficiency of zinc sulphide detectors for monitoring alpha particles in liquid solutions. I need to model things like the proximity of the detector to the liquid, the size of the detector and the thickness of the light-tight...
  15. H

    Ansys Maxwell Modeling of Switched Reluctance Motors

    Hi Everyone i'm new member of Physics Forums, my research field is about Switched Reluctance Motors i have question about Optimetrics in Maxwell! my question is: How can Optimize Design Parameters ( like Outer and inner Diameter of Stator and Rotor or Embrace of them) of a Switched Reluctance...
  16. G

    Factoring Higher Order Polynomials: A Practical Method for Control System Design

    Homework Statement Determine the parameters of the PI controller such that two of the closed-loop poles of the transfer function Gclr(s) correspond to the poles of a second order LTI system with the following specifications: i) overshoot S% = 25%; and ii) settling time ts(5%) = 120 s. Homework...
  17. AndresPB

    Response of a System: Transfer Function

    Some time ago I made a modelling project and obtained a plot. Now, I want to remember what the transfer function was, as I want to try changing the parameters. The graph is the following: How can I obtain the transfer function? Thanks a lot
  18. Telemachus

    Correct numerical modeling of the 3D Dirac Delta function

    Hi. I was trying to test a code for the diffusion equation, using the analytical solution for infinite media, with a Dirac delta source term: ##q(\mathbf{r},t)=\delta (\mathbf{r}) \delta (t)##. The code is not giving the analytical solution, and there might be several reasons why this is so...
  19. jamalkoiyess

    A Modeling and simulating a 2D Turbulent flow

    Hello PF, I am new to the science of turbulence and fluids but recently I have been working with my professor on 2D steady state turbulence and I was looking for a way to model and simulate this scenario: I have a flow affected by a spatially varying magnetic field and having a current pass by...
  20. C

    Modeling a Heat Source with the 2D Heat Equation

    Homework Statement Hi, So I have a perfectly insulated rectangular plate and I trying to use the 2D heat equation in conjunction with numerical finite diference methods and MATLAB to see how the temperature changes throughout the plate. My issue is with the heat source. I am supposed to decide...
  21. M

    Pick a,b,c,d for y=ax^3+bx^2+cx+d that models path of plane.

    Homework Statement A plane starts its descent from height ##y =h## at ##x = -L## to land at ##(0,0)##. Choose ##a, b, c, d## so its landing path ##y =ax^3 + bx^2 + cx + d## is "smooth". With ##\frac{\mathrm {d}x}{\mathrm {d}t} = V =##constant, find ##\frac{\mathrm {d}y}{\mathrm {d}t}## and...
  22. nearc

    I Modeling Simple N-body in Hypothetical Relativistic Dark Flow w/ Netlogo

    Looking for existing examples of or guidance on building computer simulations of simple N-bodies in relativist situations. Of particular interest is the simulation of a planet orbiting a star whilst that trivial solar system is caught in a dark flow of relativist velocity; maybe .8 or .9 C. Not...
  23. Ron Burgundypants

    Modeling an Einstein solid that is coupled to a paramagnet

    I'm working on a project at university to calculate the magnetocaloric effect of dysprosium. This will be done using a new technique designed at the university of which its not necessary to go into detail about. In short, the Dy is placed in a solenoid, through which a current runs, the current...
  24. CivilSigma

    Modeling Moment and Shear Connections

    Homework Statement I am trying to model a structure that has moment connections between some beams and columns, and shear connections between the remaining beam and columns in 3D. The software I am using (S-Frame 11) gives me an error when running the analysis for the nodes that I have...
  25. opus

    B Exponential Growth: Modeling growth in months vs years

    Say I have a function that represents the population growth of a certain country that can be written as ##f\left(x\right)=1.25\left(1.012\right)^t##, where t is in years. I can graph this function and it will look a certain way exponentially. I've looked at a ton of examples, and they're all...
  26. S

    Modeling of two-phase flows in electric and magnetic fields

    Hi, Can anyone direct me to some literature that describes the numerical solution of full Maxwell's equations and Navier-Stokes equations for two-phase/multi-phase flows in coupled electric and magnetic fields. Thanks!
  27. P

    I Radiation modeling software (radiation blocking qualities)

    Hi guys, I'm wanting to test materials developed in CAD software for their radiation blocking qualities (EM Spectrum), I would ideally need to use a software where I can set the wavelength and frequency of the emitter and set up a receiver, allowing me to place different materials in the middle...
  28. P

    Mathematical Modeling of an articulated vehicle (trailer)

    Hello, I have an problem with mathematical modelling of a special kind of articulated trailer (please have a look at the images: 1st image is the yaw plane and the second is the ZX plane). I have two methods of deriving equations of motion namely Lagrange and Newton-euler to analyse their...
  29. S

    MHB Modeling the flow from a gate at the bottom of the reservior

    I need to model a system of water flow from a gate whose opening is a function of time the height of the reservoir = H width of the gate = w opening of the gate = f(t) = 0.01t^2 how can i create a differential equation that takes an account of the varying area of the gate?
  30. Nikhil N

    Dynamic modeling of a system and transients of the system

    Consider, I have a dynamic system model for air compressor. Which means I have modeled the system by including its physics. Does this means I also included the transients of the system? What I think is, when i modeled any system with equations, I think that includes the transients. Is it...
  31. JonMoulton

    New Life History Simulation Modeling Platform

    mod: approved HexSim Life History Simulation Modeling Platform - free to download. Landscape ecology, anyone? After >10 years of development, the HexSim life history simulator is ready for use by students and researchers.HexSim is a free, versatile, multi-species, life history simulator ideal...
  32. A

    Agres, introduction & ice sheet modeling issue

    I always had an interest in science. At SUNYA, I took a lot of science, and did modeling for Jay Forrester's Club of Rome Report. My junior thesis was based on that work, and my advisors laughed at it, so I decided that I did not want a degree from SUNYA. My second choice university did not...
  33. S

    I Modeling lossy optical media

    In Quantum Optics by Mark Fox, it says that a lossy medium can be modeled by a beam splitter that splits part of the input and sends it to the "loss port", while the unabsorbed energy propagates to the output. This model accounts correctly for the loss, the increased noise at the output etc. Is...
  34. E

    Can I Use Blender to Create Weapon Models for Fallout 4?

    This is only the third thing that I've created in 3D modeling. If you played the PC video game Quake 2 back in 1998, then you might remember this. https://imgur.com/a/dqEqD
  35. E

    Python Optimizing Topic Modeling: Saving and Loading Models for Faster Processing

    Hello, I am running a program that takes relatively long time to read the corpus of some documents, and create the topic model. The code to do this is: from gensim import models, corpora corpus = corpora.BleiCorpus('./data/ap/ap.dat', './data/ap/vocab.txt') #Creating the topic model model =...
  36. thepikminman

    Vibrations - Modeling system, equation of motion

    Vibrations - Modelling system, equation of motion Hi, In the first question (question 4) in the attached file, how would you go about modelling the system and finding the equation of motion? All those masses are confusing me, I don't even know where to start. I don't know whether the angle...
  37. D

    LaTeX Modeling 3 species using omnivory models. Latex code is included for the proof of continuity, etc

    \chapter{Sensitivity Analysis} The first step in our method to obtain the sensitivity of each parameter value is to differentiate the right hand side of each model with respect to each model parameter. The partial derivatives for the right hand side of our linear response model...
  38. S

    Water Supply Reliability Modeling assignment + datasheet

    I am taking a my first water management course and I need your help getting through my first Water Supply Reliability Modeling assignment. It involves a data set that I must manipulate and a problem set. I am not a civil engineer, so I do not know where to start with this. The only hint I have...
  39. A

    Modeling analytical solution of 1D heat equation

    I am trying to write code for analytical solution of 1D heat conduction equation in semi-infinite rod. The analytical solution is given by Carslaw and Jaeger 1959 (p305) as $$ h(x,t) = \Delta H .erfc( \frac{x}{2 \sqrt[]{vt} } ) $$ where x is distance, v is diffusivity (material property) and t...
  40. F

    CFD Modeling of Flue Gas Pollution Dispersion

    I've previously studied and used the k-epsilon turbulence model within Ansys to model water in a small stirred vessel. I am now interested in CFD models appropriate for modeling flue gas dispersion. I'd like to know: What additional considerations are required for modeling a gas as opposed to...
  41. ReidMerrill

    2nd order ODE: modeling a spring

    Suppose a spring with spring constant 6N/m is horizontal and has one end attached to the wall and the other end attached to a 3 kg mass. Suppose the friction/damping constant is 1 N s/m Set up a differential equation that describes this system with x denoting displacement of the mass from...
  42. F

    Modeling a mechanical power system

    I'm working on modeling a basic mechanical power system for a video game project. The transfer system consists of meshing gears, belts, and axles/shafts which can have basic clutches that engage/disengage. There are also power producers (hand crank, windmills, water wheels, turbines) and...
  43. S

    Can a Model Accurately Simulate Pressure Variations in Tillage Tools?

    Hi all, I have just measured the pressure on a point of a tillage tool and the resulting signals is reported in the following link. In literature, tillage tool are modeled with a constant pressure, but i reality the pressure changes over time and I would like to model the pressure...
  44. O

    2 degree of freedom system modeling

    Hello, I'm having difficulty finding equation of motion for 3 degree of freedom spring mass system. Homework Statement the positions of the masses at the equilibre are respectively X10, X20, X30 At t = 0s, the mass m1 is drawn to the...
  45. Jim Lundquist

    I Gravitational Wave Modeling: A Thought Experiment

    I am thoroughly confused regarding the modeling and graphic depictions of gravitational wave propagation. These waves must propagate in three dimensions, not in the planar rubber sheet example that is often shown or the ripples on a pond example. Even the recently publicized example of the...
  46. ohwilleke

    I Looking for literature re imperfect quantum gravity models

    Preface There are lots of times in physics when we use approximations of a more accurate or fundamental physics theory because it is easier to work with. For example, in quantum chromodynamics (QCD) lots of calculations are done using the Schwinger-Dyson equations rather than the actual...
  47. A

    Help with mass-spring modeling problem

    Homework Statement Suppose at time zero, the bob was drawn upward four units from the equilibrium position, let C=2, K=2, m=1 lbm, initial speed=2 unit/sec find an expression for body's position. and in the solution it says: y''+6y'+5y=0 my question is: from where does the numbers (6) and (5)...
  48. V

    Modeling Heat Transfer from a Flame to a Copper Tube using ANSYS

    Homework Statement Can't model a simplfied version of my problem, it's a Steady State Thermal problem. I'm trying to get the superficial temperature of a copper tube and the heat transfer from a flame to the tube(this is a simplified version of the problem). Now my problem started when I...
  49. Eclair_de_XII

    Mathmatical modeling with Toricelli's law

    Homework Statement "Fluid will leak out of a hole at the base of a cylindrical container at a rate proportional to the square root of the height of the fluid's surface from the base. If a cylindrical container is initially filled to a height of ##h(0)=12 in.##, and it takes one minute for the...
  50. D

    Abaqus modeling of a complex material

    hello all i'm trying to modal a complex material with matrix of material X and small spherical inclusion of material Y, i would like to have the ability to control the density of the inclusions and the surface properties between the material. does anyone know about a guide for the situation...
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