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Questions tagged [modeling]

Use this tag for questions about numerical or analytical modeling and simulation of engineered systems.

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How can I apply remote force in Pro/E

I am a beginner in ProE and simulation. I would like to apply force in ProE simulation like below picture. Could anyone explain how to put the payload on a remote point?
KKS's user avatar
  • 354
5 votes
2 answers
966 views

Dynamic mass balance in plug flow reactor

So I would like to ask you about a problem I encountered. The case study goes like this: I want to study species distribution inside a packed bed reactor, at first at steady state but eventually what ...
ASK22's user avatar
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1 answer
74 views

beam cross section modeling by extrusion on proe

I would like to create beam models having various cross sections on ProE tool. Can I create a beam model like below by only extrusion? Can anyone explain what is the best way to model various cross ...
KKS's user avatar
  • 354
1 vote
0 answers
37 views

Autodesk Inventor Constraints for Clockwise / Counterclockwise / Dead Points

In the YouTube video Spherical 4-Bar Infinity Mechanism by Thang010146, Dead Points are not compensated for by mechanical means. How can Autodesk Inventor Constraints be applied to such a mechanism to ...
skibulk's user avatar
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1 vote
2 answers
2k views

How to find the angle of deformation in Ansys APDL?

After solving my problem in APDL, and started doing some post-processing, I want to find how much the deformed shape has rotated (i.e. the maximum angle the furthest node has made comparing with the ...
AlFagera's user avatar
  • 113
8 votes
3 answers
1k views

How do I use FEM to derive the torsional constant of an arbitrary shape?

In this question I ask about how to perform a first-principle derivation of the torsional constant of a section. It appears that there is no such analytical derivation for torsional constant, so my ...
Graviton's user avatar
  • 1,264
3 votes
2 answers
102 views

connectedness between the output voltage and input voltage

Given this circuit I want to deduce the relationship between the output voltage $U_A(t)$ an d the input voltage $U_E(t)$ using Kirchhoff's current law. We're allowed to assume that $R$, $L $and $C_1$ ...
fear.xD's user avatar
  • 133
1 vote
0 answers
113 views

Efficiency model for centrifugal pumps, using relations from Europump's Ecopump project

Context: I'm trying to create a mathematical model for centrifugal pumps. This model should describes how the operational variables of centrifugal pumps $(Q, \Delta P, ...)$ related to it's design ...
Reza Afzalan's user avatar
10 votes
2 answers
811 views

Differential equations of a (simplified) loading bridge

I am having trouble to calculate the differential equations of a simplified loading bridge. The system is build as shown in the picture below (just a sketch): If I use the Newton approach, I am ...
tlp's user avatar
  • 103
1 vote
0 answers
45 views

Verify parameters variation in local sensitivity coefficients for microkinetic model

I’m performing a sensitivity analysis for a model of a set of elementary chemical reactions. I’m considering the variation in species concentration ($c_{k}$) with respect to the forward reaction rate ...
user5299406's user avatar
5 votes
1 answer
844 views

Discontinuity in mechanism simulation: is the mechanism jammed or is my analysis wrong?

I'm designing a compact mechanism for the deployment of a mast. The idea is that the linear actuator for the deployment is on the other side of the pivot, and a slider increases the lever arm to ...
Mister Mystère's user avatar
7 votes
2 answers
342 views

Modelling splashing water in FEA

I'm running an FEA on a vessel that has a "splashing water" effect with vibrations. The problem I'm really coming up against is what kind of Young's Modulus and Poisson's ratio to use for the fluids? ...
Mark's user avatar
  • 5,333
5 votes
1 answer
879 views

Coupling in a twin engine, tandem rotor power train

Consider a transmission for a tandem rotor helicopter with two engines and two main rotors such as the one below. Both engines are connected with sprag (one-way) clutches such that an engine's speed ...
Mike's user avatar
  • 51
7 votes
1 answer
254 views

Sending out a 12d Civil Design Model

My project team and I delivered the design of a 14ha urban infrastructure development in Sydney for a Client. The project was to hand over the development at a Tender level of design, which would be ...
Louis Russell's user avatar
2 votes
1 answer
696 views

Simulation of First Order System (Matlab & Simulink)

Yesterday, I tried to find constants $k_1$ and $k_2$ for the following system: $$\frac{\mathrm d RH}{\mathrm dt}=k_1+k_2(RH_{ext}-RH).$$ Now, I have some first computations for $k_1$ and $k_2$ and ...
donald's user avatar
  • 47
1 vote
1 answer
277 views

Parameter Estimation for First Order System

I would like to get a simple estimation of the parameters for a humidity chamber system. The humidity chamber has one constant inflow ($k_1$) and and outflow which depends on the humidity of a ...
donald's user avatar
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6 votes
1 answer
1k views

FEM modal analysis computing displacements

I have an FEM model that I am doing a modal analysis of. I wanted to check that how I am computing the physical displacement is the correct way, as I've read a lot of about normalizing modes, ...
engstu95's user avatar
12 votes
1 answer
4k views

Insufficiently constrained structural model in Ansys

I want to analyze this model that is stressed and deformed. I fixed the lowest of points in the x, y, and z directions, and I pulled top of points upward (y direction). When I run the model in Ansys I ...
Bae's user avatar
  • 121
10 votes
1 answer
321 views

Developing a stochastic differential equation model for concrete fibers

I am working on modeling concrete fibers (metallic fibers) as a mathematical model. My work is for my thesis. I am a PhD student of numerical analysis, but I am working on a real tunnel project. I ...
Khosrotash's user avatar
6 votes
3 answers
957 views

Is a distributed load in two parts equal to a full distributed load?

I have a structure like such: Due to my lack of knowledge of ANSYS, I have made the singular distributed loading (GI) represented as two distributed loadings (GH and HI). Would this be an accurate ...
General Stubbs's user avatar
2 votes
0 answers
1k views

What data do I need to plot a BSFC map

I have an 4 stroke spark ignition engine simulator which takes user inputs and outputs performance data. I need rpm, torque and brake specific fuel consumption (bsfc) to plot the bsfc map. I am able ...
Eugene's user avatar
  • 21
8 votes
6 answers
825 views

Can two different modeling programs be used to confirm the results of each other?

Computer Models Computer modeling is used in various engineering fields. I am specifically considering structural analysis or finite element analysis (FEA). Sometimes models are used to speed up ...
hazzey's user avatar
  • 10.7k
7 votes
2 answers
2k views

How can I model or simulate motion caused by an internal vibrating motor?

I have a vibration motor contained in an object. The motor looks similar to this: When the motor is running, I want to simulate the movement of the container object that results from the vibration of ...
Geva Tal's user avatar
  • 173
7 votes
1 answer
479 views

Boundary condition for a parallelogram-shaped excavation on an embankment

What we learn in engineering school is often idealistic, with textbook examples showing typical prismatic steel beams with a plastic section classification or excavation in a perfect sand or clay ...
Question Overflow's user avatar
18 votes
5 answers
1k views

Meshing of complex geometrical domains

When using the finite element method, I have always used either already meshed domains or very simple ones. From what I've heard, meshing complex geometries is often outsourced to specialized ...
Bérenger's user avatar
  • 281
12 votes
3 answers
5k views

Which turbulence models are suitable for CFD analysis on a streamlined vehicle body?

Many commercial and open-source CFD codes implement several closure methods for the non-linear convective acceleration term of the Reynolds-averaged Navier-Stokes (RANS) equations. Common methods (...
Paul Gessler's user avatar
21 votes
8 answers
3k views

How do engineers really use numerical simulation?

Disclaimer I'm an applied mathematician by training, not an engineer. My work research primarily focuses on creating new "methods" to solve different PDE's related to solid deformation (elasticity) ...
Paul's user avatar
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