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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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2answers
49 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?
4
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1answer
101 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 ...
3
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1answer
40 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 ...
3
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1answer
124 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 ...
1
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1answer
45 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
84 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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0answers
69 views

How to obtain relative movement and rotation of bridge bearings?

In structural analysis of a bridge using whatever software, such as MIDAS or SAP 2000, it is easy to obtain the deformation of individual nodes. However, for bearings, what we want is the relative ...
2
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0answers
46 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 ...
2
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0answers
29 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 ...
2
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0answers
47 views

What specific characteristic of proportional solenoid valves makes the flow to current behavior quadratic?

If experimental data is obtained from a proportional solenoid valve, specifically flow vs current (assuming inlet pressure is constant), the fit is nearly quadratic in nature. Andersen's Analysis and ...
2
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0answers
47 views

How can I model a plane's trajectory in a simple way?

I would like to model a plane trajectory, here are my assumptions and conclusions so far: Assumptions: we denote the plane's speed with $v(t)$, its trajectory $x(t)$, the total trajectory time will ...
2
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0answers
149 views

Modeling heat and mass transfer modes inside rapidly rotating cylinder

My question is about simultaneous heat and mass transfer in rotating cylinder system. System can be detailed as: A rotating cylinder contains wet porous substance in a lump shape. Air stream enters ...
2
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0answers
966 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 ...
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0answers
37 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
30 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 ...
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0answers
15 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
20 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 ...
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0answers
141 views

How to model ball joint in Patran/Nastran?

I would like to model below mechanical system in Patran. But, I don't know how to configure boundary condition of ball joint. The ball joint is spherically rotated. When the described system is in ...
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0answers
100 views

What are the various lumped element dynamic system models called?

What are the various lumped element dynamic system models called? By lumped element dynamic system models, I mean the various nodal models comprised of things that look like capacitors, inductors, ...
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0answers
52 views

Inventor: How to replace static part with articulation?

I have downloaded the following part file of a servo motor as IGES from the vendor: I have then built an assembly that uses several of these motors, as well as a number of idlers/hubs, brackets, ...
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0answers
105 views

How is rolling resistance accounted for in the Pacejka Curves?

I am simulating the acceleration of a car (FSAE) in a straight line. I have data of the Pacejka Curves ($F_x$ vs. $SR$) of the tire we will be using. The thing is that the curve doesn´t pass through ...
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0answers
25 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 ...
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0answers
95 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 ...
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0answers
40 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 ...
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0answers
13 views

Source for learning Functional derivative , Gateaux derivative

I have started doing research in optimal control theory. My area of research is PDE constrained optimization. I am facing significant difficulty in deriving the Gateaux Derivative of functionals ...
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0answers
19 views

Developing a model of rate of cooling of steel tube in air

I am trying to develop an equation to determine the cooling rate of a steel tube in air. I'm using Fourier's Law, Stefan-Boltzman Law, Newton's Law as well as the specific heat capacity equation. The ...
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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 ...
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0answers
43 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 ...
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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
38 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 ...
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0answers
55 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 ...
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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.
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0answers
19 views

How are these bondgraph (de)composition rules for transformers and gyrators derived?

why does a C element through a transformer with transformation ratio n become $C/n^2$ and why does an I element through a gyrator with transformation ratio r become $I/r^2$? Source: Modeling and ...
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0answers
88 views

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?
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0answers
77 views

Looking for an empirical model to simulate a braking resistor

I'm looking for a model of braking resistance to simulate and explore information from a load (power) profile of a fork lift 7[t]. This power load should be handled by a hybrid system (battery +23*...