Modelling Definition and 250 Threads

I have an actual flyback converter on a chip and I'm thinking of having a simulation platform to model the circuit on MATLAB. This is because somewhere down the road I intend to modify the inductor by biasing it with a permanent magnet in order to prevent premature saturation. It is hoped that...

On a stretch ofsingle-lane road with no entrances or exits the traffic density r(x,t)is a continuous function of distance xand time t, for all t > 0, and the traffic velocity u(r) is a function of density alone. Two alternative models are proposed to represent u: (i) u= uSL (1 – r^n/...

Traffic Flow Modelling, I really confuse and do not how to start :confused:.

HI, i am a student taking final year project in my university, my project title was C++ modelling of axial turbocharger, it was a counter-rotating turbocharger, can anyone help me to get some useful information to complete my project? thanks

Hi all, I´m a researcher in computational biology thinking on topics quite far from my field. Would you help me? Thanks in advance! I want to calculate the drag force in air of big rigid spherical and cylindrical objects at speeds form 0 to 100 Km/h. Their diameter would range from 1 to 20m...

Hello. I am currently a student at UCF in Orlando, FL. Simulation and modelling are big things around here. I have the opportunity to get my master's degree paid for by the lab I work in. I'm not terribly excited to stay here for another two years, but I really don't want to get a master's if I...

Hi all. I am working on a problem in which I want to model the collision of a moving object, with mass m1, with a stationary base. I have calculated the velocity of the moving object at the instant of collision. I want to model this collision using a mass spring system with damping. My...

Homework Statement A culture of bacteria have a growth rate (as a percent) given by kb per year, constant k>0 and b is the number of bacteria. A virus removes bacteria at a rate of m bacteria per year. I am trying to model this information using an ODE, but might be making a mistake. Homework...

Homework Statement Model the pupil of the eye using a single slit. If the eye is able to notice changes in intensity of 20% show that it can distinguish two objects separated by an angle of 0.00015 radians if =500nm and diameter=4mm. Homework Equations I=Iosin^2((π/λ)asinθ)/...

Hi This isn't a homework question, just a problem I thought up of but would require some implementation I don't really know how to do. Homework Statement If I have a microfluidic channel with laminar flow and a parabolic velocity profile as predicted in the Hagen-Poiseuille flow, and I...

I'm looking for a good resource about modelling for differential equations. I've completed two courses on ODE's and PDE's, but they both lacked in the applications/modelling department. Can anyone recommend a good resource/book on modelling?

Hey there, I am currently working on creating models in Abaqus of Wrist implants to see how they respond under different loading conditions. I have used Mimics to export orphan meshes of the wrist bones and also imported the wrist implant itself. My simulations seems to be running fine all...

Firstly, this is not homework - it's a project I have started our of sheer curiosity. I have searched quite at length, but cannot really find anything that suits my problem. I want to model this on a computer and would like to implement it myself as I would like to understand the...

say i have 500,000 0s or 1s. say i have 50 such sets, each that i have ranked or assigned a value to - "harshness". can i then extrapolate - is that the right word - to find the perfect dataset that instantiates the property of harshness? and can i measure the harshness of other datasets...

Hello friends, I am into modelling of electric hot water tank which is vertical and has the capacity of 120 litres. I just assumed certain charactersitics of an existing heater so as to be more realistic in my approach. Now I am facing certain troubles in my calculations, if you know please...

I'm looking for a general model that I can use to approximate the evaporation rate of a small pool of liquid. The purpose is to calculate the rate at which a few mL of liquid is evaporating at the bottom of a cylindrical test chamber for an experiment. I figured that I wouldn't have any trouble...

Hi, I'm new to MATLAB and programming, but I hoping to find out if I can have a variables in my program take on certain values only for certain time intervals. For example, I am using ode23s to solve some equations for me, but for the time interval [0,10] I would like one of the variables...

Hi, hopefully this is a simple question and easily answered. I've been doing some reading on the subject of mathematical modelling and examples of modelling reports. In one report, the failings of the model are put down to "dynamic forces". I've taken this to mean that there are external...

Dear all! I have encountered a problem with modelling a truss. When modelling on an analysis software, you must release the ends of the joints, but not all or it will form a mechanism, therefore you release all but one of the joint. But what I have here, is a truss that is released on all ends...

I am pursuing bachelor in engineering.i have a case study involving the stabilization of an inverted pendulum about it's unstable equilibrium point. My problem is that I have to digitalize my system before i can implement it. Can anyone tell me how to digitalize the system.

http://dl.dropbox.com/u/33103477/Resistor.png For the first bit first I solved the equation \frac{dI}{dt}=\frac{U-RI}{L} I(t)=\frac{U-C_2e^{\frac{-t}{L}}}{R} Now I put in T(0)=0 to work out the constant and I got I(t)=\frac{U-Ue^{\frac{-t}{L}}}{R} Now here's the dodgy bit, I did...

Homework Statement Suppose a book of 600 pages contains a total of 240 typographical errors. Develop a poisson approximation for the probability that three partiular successive pages are error-free. The Attempt at a Solution I say that the number of errors is poissondistributed...

Homework Statement The Attempt at a Solution I think that problems such as this one tend to take on the rough form of \frac{dQ}{dt} = rate in - rate out. I suppose I should treat each lake such that is has it's own equation regarding concentration. I reasoned that, in the case of the...

I would like to do the mathmatical modelling then apply it in matlab. This is my trailier. Vp-ip*Rp-Lp*(dip/dt)-Rc*ic = 0 ----- 1 Vp-Lm*(dim/dt) = 0 ------2 i need the modelling of the secondary voltage to the primary and the flux Vs= ? flux= ? I did apply it in MATLAB but didn't work.

Homework Statement Working on a project for a vibrations course, task is to quantitatively analyse a system in which mechanical vibrations occur. I chose to model aircraft landing gear, for a variety of different airplanes, namely one large transport (747), a simple tricycle gear GA plane...

Hey all. I feel as if I've dug myself into a dead end and I'd appreciate some career advice. I'm a senior computer engineering student with a 3.8 GPA at a decent engineering school. I chose the major to further understand the mysteries of computers. I enjoyed learning what I did, because now I...

Hi Could anyone point me in the right direction? I'm employed at a small firm, only three employees at the time being. Our competencies spans from architecture to programming. We're in need of somebody who can help us create a finite element solution which we can implement in the cad...

Hi all, I am attempting to model soliton formation numerically. The solitons will be formed by moving a body of some sort through a shallow channel of water with the free surface subject to atmospheric pressure. My goal would be to numerically predict wave amplitudes, wavelengths...

Hi guys, me and my fellow classmate have been working on a math problem we believe to be a Modeling and Optimization type problem in our calculus class. We've been at it for 2 days now! Just can't seem to figure it out... We'd really like appreciate and all help! Homework Statement [There is...

Dyalog APL anyone? Anyone? Anyone? I've been trying to find resources on modelling specific physics situations with Dyalog APL and have had no luck. I have Mastering Dyalog APL which is the guide from their website but I want some more information. I'm looking to model specifically forced and...

Homework Statement Please see the picture shown below: Homework Equations I know the inertias of the AO and BO beams w/ respect to O are both 1/3*ml^2, but what are the inertias of AC and BC w/ respect to O?The Attempt at a Solution Any other hints that you guys have for solving a problem like...

How can we merge 3 FFT spectrum graphs in one as shown in the picture? AND THANK YOU I have written the codes for the 3 spectrums but need to join them as shown.

Hello, I have a little problem I'm thinking about for work. We are considering a design that moves heat across a contact interface between 2 heat exchangers, each made of copper, in a high vacuum environment. There will be one fixed heat exchanger, maintained at 25 C by coolant flow. This...

First of all, I haven't the slightest idea how a quantum computer actually works but I understand that it is theoretically possible to make them and they could, in theory, be used to compute things that a classical computer would take too long to compute. (i.e. large combinatorial problems like...

THe EQUATIONS IN THIS POST HAVE NOT GONE THROUGH SO WILL TRY TO FIX THIS AND RE SUBMIT ASAP (I used mathType?) Now attached the post as a word file to fix the above. I’m playing around with possibilities and my own ideas about “the measurement problem” and have a query about the validity...

Homework Statement Hi everyone! This is not actually a homework problem, but I thought it was similar to one so I am putting it here. Basically I was watching this youtube video of a falling slinky and I decided I wanted to try modelling it with physical equations: The problem I have...

Hi, I need to model heat transfer in a 3D digital environment. I have very little physics / engineering background so I have no idea what's available or what software / methods are used. I have some background in CAD and general experience in Matlab, but this is going to be a steep learning...

Though this question is about medicine, the actual question has little to do with medicine and more to do with modelling .. Homework Statement A patient is put on an intravenous drip at time t=0, the drip supplies a drug into the patients bloodstream at a constant rate λ. At the same time...

Dear, First i modeled linear springs with abaqus: Model >> Assembly >> Engineering Features >> Springs/Dashpots >> Connect two points, In this way i can define just only the spring stiffness. So therefore i would like to define a non linear springs. I used the connecter builder >>...

Hi, I don't want to list the exact problem I have to solve, as I would rather do it myself, all I would like is some guidance. The problem is a function like: Pk+1=a (Pk-1) with a few more constants and some brackets thrown about on the right hand side. I need to find all the equilibrium...

Hi guys, I need to model a curve and I am trying to come up with an exponential equation. I have several points I can work with and this is what I tried so far. (I want to know if this is the correct method or if there is a more precise way to go about this) I am working on something of the...

This is not homework but I would consider it to fall in this category. I am working on a robotics project and wanted to simulate a PID controller before implementation. I need to find a transfer function for my motor for this to work. Homework Statement As mentioned above, I need to find...

Hello. I am an engineering student and i am attempting to model the gravity around the asteroid Eros by expanding the potential as a spherical harmonic expansion. I got the coefficients (Clm and Slm) from the Planetary Data Model of Eros(NEAR Collected Shape and Gravity Models available at...

Hi everyone, I need to model a crank sensor with a flying wheel in Maxwell. Crank sensor is made of permenant magnet, pole piece (to concentrate the magnetic field), and coil. There is a space between the target wheel and the crank the sensor. What I have to do is to simulate the output...

I'm working on something right now where I want to model the flow of an electrically charged gas (hydrogen) reacting to an electrostatically charged metal grid. I know, more or less nothing about this type of mechanics, so I want to create a model using a simple programming language, with a...

Hi, I am trying to create two coils with different axes on Comsol Multiphysics 3.5. I use the 2D axisymetric mode but it allows to create only coils with the same axe. Can somebody help me ? Thanks in advance.

When you are modelling elements like tubes, the local x-axis is defined along the tubes length. If a unit vector for the z-axis is not applied, modelling softwares defaults to a coordinate system where the local zx-plane is parallel with the global zx-plane. I'm not sure what that means...

* Anti de Sitter space is used in the AdS/CFT conjecture. But the universe is composed of de Sitter space. So not*use de Sitter space?* If only*AdS can work in the model, and it's not even representative of our universe, then it may be just wrong. *

Hi everyone. I want to find out thermal gradient (or temperature distribution) in a structure subjected to multiple mediums at different temperature. Would Ansys be the right tool for it, or can you suggest one? Would the methodology be to draft the structure in a simulation software first...

Here is the problem. I drop a pole (say length L, mass M, radius R) on a non-Newtonian fluid (corn starch and water) with impact velocity v. The density and viscosity of the oobleck is known, and I know the dimensions of the oobleck container (a square box of length S filled up to height H...