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Questions tagged [modeling]

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

0
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2answers
27 views

Is there any device that can capture a picture into 3D model?

I am currently wondering is there any way or device that can transform a picture into 3D model automatically? or a machine learning thing to learn from picture (2D) into 3D model?
3
votes
1answer
34 views

Torsional rigidity D vs torsional rigidity factor k vs torsion constant J

I have a physics background so apologize my ignorance. I'm confused by the constants $D$, $\kappa$, and $J$ when it comes to torsion of beams. From what I understand $\kappa$ and $J$ are the same ...
-1
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0answers
8 views

How do I make a body using planform points in AVL (Athena Vortex Lattice)?

I am having issues with creating AVL bodies from planform images. I have the points ready (from using graph-tracing software), but I do not know how to convert these into AVL bodies/files. How do I do ...
0
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0answers
19 views

How do I construct this block diagram

I'm doing some homework and I've been stuck on part c. I can't get my head around what the block diagram should look like. I'd appreciate it if somebody could show me how to arrive at the solution. ...
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0answers
36 views

Am I estimating thrust of a ducted fan correctly?

I'm asking if I'm doing this correctly. I've estimated the thrust of a ducted-fan model aircraft neglecting pressure changes across the duct as follows: $$F = Q * \rho * (V_e - V_0)$$ $$= Q * rho * (...
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0answers
34 views

“Freeze”/Mold paper in a certain bent position [closed]

I have a piece of paper (lets says its a A4) and I bent it in a certain way (like a skateboard ramp, I'm holding the ends and the middle kind of falls forming this "ramp" model), but now I need a way ...
-1
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0answers
8 views

How to Calculate the Speed Ratio between two rollers (overdrive of take-up roller) to provide a required Tension web tension

I have a web feed system with a re-winder and I need to apply a tension to the web. I have a driven roller and a take-up roller. I need to calculate how much overdrive to supply to the takeup roller ...
1
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0answers
27 views

Method to simulate a dipole antenna in salt water?

I am looking to simulate the radiation pattern of a 2.7Ghz half-wavelength dipole antenna immersed in salt water. I've been using Altair FEKO software to try and accomplish this. I've tried two ...
2
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1answer
49 views

How are NPT hole features defined?

I'll be the first to admit that I have always been somewhat confused by best-practice dimensioning standards surrounding pipe threads. While there is a decent amount of literature available online, (...
2
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2answers
72 views

Viscoelasticity and Hyperelastic model, history and difference

Actually, I see some papers use viscoelasticity or hyperelastic model for the same materials. It seems to me that those models were invented in different eras, and the hyperelastic is a newer model ...
0
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1answer
26 views

How to get the surface area of trajectory [MSC Adams]?

I'm not sure if the upper question is clear enough to understand but here's what I've got: I've made a model of excavator in Adams View and got trajectory of it's motion (boom, stick, bucket) using ...
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1answer
31 views

Parametric equations for fan blades

I'm looking for an explicit numerical example of a parametric surface (u, v) |-> (x(u, v), y(u, v), z(u, v)) that models a fan blade like that in the attached picture. Googling results in NURBS/PDE ...
1
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2answers
38 views

Example of real-life problem solved with numerical methods? [closed]

I hope this is a suitable question to ask here. Well, I'm taking Numerical Methods this semester (also called 'Numerical Analysis' in some places). The term-assignment is to find a real-life problem ...
3
votes
1answer
57 views

Modelling gas desorption from a still solution (e.g. a beer)

The common way to model or estimate gas (e.g. CO2) desorption rate from a liquid solution is by using an equation similar to this one $J_{CO_2} = -k_L a(H·C^G_{CO_2} - C^L_{CO_2})$ where $J_{CO_2}$ ...
1
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3answers
76 views

Git, Mercurial, others — what's the best system for an engineering team new to version control?

I recently started working with a new team doing detailed energy modeling for all flavors of building projects -- commercial, industrial, residential, new construction, renovations, additions. As the ...
2
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0answers
44 views

How to join two beams rigidly?

Hi I am making a beam model using Abaqus. There are two beams created. I wanted to join two beams rigidly in the connection to transfer moments between beams. However, I do not know what connector or ...
1
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2answers
53 views

How do you read a blower/compressor curve with multi-curves for inlet guide vanes?

I am trying to apply an existing blower curve in a hydraulic model for a single stage blower with variable inlet diffuser vanes. The variety of curves shown on the plot does not seem to make sense to ...
0
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0answers
15 views

Should I use a regular curve fitting tool or system identification to calibrate/model a gyroscope to a reference?

I want to create a model that describes how well a gyroscope can approximate the angular velocity that I apply to it. Since it's never really possible to obtain the exact angular velocity, it is based ...
0
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1answer
56 views

How to make datum planes on a cone in Creo?

I am trying to make this I was able to make the base feature but I am facing problems with the secondary features. So could anyone shed some light on how to make the datum planes on cones. I made ...
0
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1answer
51 views

How does the superposition principle relate to Bernoulli-Euler and Timoshenko beam theory? [closed]

I have a shaft with a bearing in each end, and a large eccentric mass covering the entire "free length" of the shaft. The attachment of the eccentric mass is done using heat shrinking. Without ...
0
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0answers
41 views

Bad triangular-shell elements in Abaqus?

Abaqus 6.14 I have a 2D shell mesh reconstructed from a *.ply file. When I verify the mesh I get 55% bad elements (CPS3). So I get a list of all the bad elements & reconstruct the mesh again ...
1
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1answer
43 views

Predicting frequencies, decays, levels, and phases of modes of a circular membrane (drum head)?

I have been working on some acoustic synthesis software for modelling several acoustic instruments. I am using the principle of modal synthesis, where every mode of vibration is individually ...
0
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1answer
40 views

Modeling the stiffness of a membrane

I'm trying to model, in MATLAB, a membrane in 2D which has an initial triangle-like shape. This membrane has pressure acting on it from the inside. There are also some pulling forces in random ...
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0answers
17 views

How to export my model as Solid model IGES Type 186 on Rhino?

I'm not able to find that option while exporting. I need to export this to ANSYS where the other available IGES formats come as only surface models.
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0answers
34 views

False turbulence in laminar flow with k-omega SST

I have a pipe with a sudden expansion from 0.25 mm to 1 mm. Fully developed flow is at the inlet and a reynolds number of 500. I use k-omega SST turbulence model because laminar simulation hasn't ...
0
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1answer
78 views

What is the advantage of successive linearization?

In this link, two methods have been referred for linearization. 1- offline linearization 2- online linearization However, I do not understand what is the role of "successive linearization" in the ...
3
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2answers
29 views

How to estimate the time cost of interrupting a task and picking it up again later

In terms of personal productivity (single machine scheduling) when a task is interrupted before being done in order to switch to a different task, it incurres a 'tear down' time cost - putting tools, ...
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0answers
47 views

How to run response spectrum for members with compression only spring in MIDAS

When running a structural model supported on footings with compression only springs, I encountered tension reaction forces in the springs. This occurs when running seismic load case using response ...
0
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1answer
34 views

Thermal Modeling

I have an electronic assembly and part of what it does is to measure and report temperature. The electronics are housed is a plastic enclosure, and there is a small fan blowing out of the enclosure. ...
1
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1answer
31 views

simplified acceleration and max speed calculations for a game? [closed]

Are there any simplified formulas that could be used to generate plausible airplane, spaceplane/SSTO, and spacecraft performance specs for a game given some basic vehicle and contextual attributes? By ...
1
vote
1answer
36 views

Explain each of the values output by HEC-RAS

I am looking at a Flood Risk Assessment that uses HEC-RAS to model the predicted levels of flooding on a piece of land. As shown in the attached image, the report lists a number of variables with ...
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0answers
14 views

How to find the maximum misalignment from vibration?

Consider the system in the (drawn in Paint) image. Assume that there is an input acceleration at the ground defined by a PSD. This acceleration can be in any axis. Points A and B are initially aligned ...
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0answers
30 views

autocorrelation function of mechanical displacement

I was wondering if there any work in the literature that has been done on the form of the autocorrelation function of mechanical displacement of an object.
4
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1answer
92 views

Questions regarding Cornering Stiffness for RC Car

I am a bachelor's level student tasked with modeling the vehicle dynamics of an RC Car that will be made to drive autonomously. I lack prior experience or particularly specific education with vehicle ...
1
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2answers
87 views

Failure of N.R.T.L method to model Phenol / Methylcyclohexane / Toluene system in AspenPlus. Why?

I have an extractive distillation column set up in AspenPlus. Methylcyclohexane (MCH) is expected to come out from the top (in the distillate stream) and the bottoms stream is mostly Toluene/Phenol, ...
1
vote
1answer
134 views

Energy consumption of a boiler

I have a question that maybe will be very easy for you. I am working on a district heating model using Dymola, and now I have to incorporate a boiler into my model, such as this one. I was asked to ...
5
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1answer
84 views

Would a partial space elevator work? [closed]

Background The normal space elevator (that reaches from the Earth's surface to a counterweight beyond geostationary) needs a material that's strength/weight ratio is better than any material we have ...
0
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1answer
50 views

How to determine the degrees of freedom for ball and beam system such as shown in pic below

Since, motion of the ball on the beam depends on the beam angle alpha, shouldn't this system have a single degree of freedom?
23
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11answers
8k views

From an engineering point of view what are the downsides of a too accurate model?

I was wondering, from an engineering point of view, for what reasons can too much accuracy in modeling be detrimental? From a scientific point of view it seems like it's almost always a benefit, ...
0
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1answer
55 views

What is an unstructured mathematical model?

I want to model a chemical process. I was searching in the literature to find similar works. In some of papers they say that "we proposed an unstructured model". What does it mean? What is the ...
0
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3answers
88 views

What program to implement mathematical models? [closed]

I am an engineering student and recently came upon some articles that provide numerical models that relate electromagnetic fields and temperature. I want to test out these numerical models but am ...
1
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0answers
19 views

Linear Guidance law into X-Y axis

Im currently writing a model for a guidance law named Maintaining Guidance law. The law looks as following: $$ a_{M} = [K_1,K_2]*[\dot{\lambda_T} ,\dot{\lambda_D}]'$$ Since im using a linear model I ...
1
vote
1answer
280 views

polar moment of inertia for compound shape

I have a shape that I'd like to calculate the polar moment of inertia for: the diameter is 600mm; the hexagon in the middle sides are 70mm each; the holes around the hexagon are 130mm from the center ...
1
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1answer
195 views

Maximum torsion shear stress in cylinder

I am trying to figure out am I doing this calculation correctly. To get the maximum shear stress for a solid cylindrical pipe I need two formulas: Moment of inertia = pi/2*r^4 Not sure what this ...
0
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2answers
69 views

moment of inertia forces and torque

I did some calculations to find out the moment of inertia and physical qualities of some metal. I am using typical medium carbon steel. I'll use a density of 7.8 g/m^3 until I get better numbers. ...
0
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2answers
156 views

Looking for program and file format for CNC Milling

I am creating subwoofer boxes out of MDF or Baltic Birch. My local makerspace has a CNC machine. I am going to make all of the cuts with it. What software is generally used or will work to get a ...
2
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0answers
27 views

Holonomic constraint forces using Lagrange multipliers

Consider a multibody robotic system with Lagrangian $$ L =\frac{1}{2} \dot{q}^{T}M\dot{q} - V $$ and equations of motion of the form $$M(q)\ddot{q}+C(q,\dot{q})\dot{q}+A^{T}(q)\lambda+N(q)=0 $$ where ...
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1answer
117 views

How to use failure criteria in isotropic material (NASTRAN)

I'm quite new in NASTRAN enviroment, and I am wondering how to use failure criteria which I can define when creating my isotropic MAT1 material for 1D elements (like CBEAM). From the Quick Reference ...
3
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2answers
171 views

Specification of linear speed dampers

I'm looking at linear compression dampers and finding them most commonly specified only with a "Max Force" – e.g., 270 lbs. However, since the damping mechanism is provided by hydraulic or pneumatic ...
3
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1answer
120 views

Is it possible to apply different boundary conditions on the same model for different load cases?

Instead of creating multiple bridge models with different boundary conditions for differential settlement, and combining the forces output manually in Excel, is it possible to specify different ...