Questions tagged [simulation]

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Tool to simulate sensor data

Say I have a light source at a distance of 1Km from a light detector (photo detector). Right in front of the sensor, I keep a rotating reticle with some sort of pattern. To better appreciate the ...
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9 views

What version of ANSYS is useful for simulation flow in a fin heat sink?

I'm interested in learning flow simulation in ANSYS and have found several tutorials. However, none say which version of ANSYS to download. The options are "Discovery Live Student", "Discovery AIM ...
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1answer
24 views

Custom User Models in Aspen Plus

I'm trying to simulate a purifier in Aspen Plus in a cryogenic system. This purifier is just meant to change the pressure of the outlet stream based on the inlet flow and pressure (we are using the ...
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7 views

How slip is calculated in the Abaqus small-sliding interaction?

I’m doing research on the sliding of 2 fracture surfaces. To do that, I’m trying to understand the Small-sliding deformable interaction in the Abaqus (2018), and I use the Node-to-surface ...
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1answer
15 views

How can I validate the validity of a model of a dynamical system?

I derived a non linear differential equation system for a mechanical system. However I doubt the correctness of it. So I compared the model's dynamics with a VREP simulation. I did this by by Euler ...
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12 views

What is the reason behind error: “the executable pre aborted with system error ”abnormal terminal request (signal 6)"?

I am trying to do an indentation simulation in Abaqus. I am using Dynamic Implicit step, the BCs are defined as the bottom to be fixed, the allocator is allowed to have movement in only y direction (...
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1answer
33 views

Pacejka “Magic Formula” tire models origin of the name

It might be a little off topic but I'm trying to find source for why is that model called magic formula? I read that it's a simple function of commonplace functions, a data fitting. Is it simply an ...
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1answer
39 views

I am trying to create an op amp based negative voltage regulator

I am trying to find simulate an op amp based linear regulator negative voltage regulator circuit. I have done the circuit for positive voltages, but does not know how to do it for negative voltage. ...
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1answer
37 views

My output is much lower than I expect it to be for my transistor-zener diode voltage regulator

I have created this simulation ( see below) of a transistor and zener diode voltage regulator. The output is supposed to be a steady 5 V. But it is like the top bit s cut, to an approx 4.4 V value, ...
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4 views

Can anyone help me to simulate welding joint in ABAQUS of dissimilar materials to find out the temperature distribution and the heat affected zone?

I want to simulate the welding joint between mild steel (AISI 1020) and stainless steel (SAE 304) by Arc and TIG welding process to find out the temperature distribution curve in the welding and heat ...
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75 views

Solidworks Flow Simulation “Rotation” option missing

I am looking for assistance to understand why, with SolidWorks 2019, in the "Flow Simulation wizard - Analysis Type" I have no "Rotation" option? I have already tried reinstalling/repairing ...
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41 views

how did Abaqus integrate the predefined field (stress) into the FEA formulation

The formulation based on the dynamic virtual work equation is Several boundary conditions can be applied. One of them which Abaqus provided is predefined field (stress). It gives the stress tensor ...
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34 views

Flow Simulation for Laminar Flow in Annular Gap?

Would anyone be able to run an air flow simulation through the following geometry at 100 cc/min? I'm curious if any dead spots occur and if the geometry of the annular gap will produce laminar flow. ...
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20 views

How to simulate data in telecommunication?

I don't know lot about communication engineering. So my naive question is that if I have number of BS(Base stations) and MT(Mobile Terminals) with some configuration like distance between BS and MT ...
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14 views

How to obtain the radial strength of a stent model in ABAQUS

I am simulating the crimping of a stent in ABAQUS/Standard using a 3D deformable cylinder on which I impose a displacement in order to crimp the stent from an initial diameter of 2.5 mm to a final 1 ...
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15 views

What's the methodology for adequate tetrahedralisation?

I'm running a linear elastic solver generating the tetrahedron's using tetGen. It's not clear to me though how one defines what's an acceptable tetra density that provides sufficient accuracy. You ...
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19 views

Displacement of Gaussian point after structure simulation

When we did the simulation, we would get deformation and got each nodes displacement. In physics, it shows the trajectory of a system of particles of the objects. Is it the same as the displacement ...
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48 views

While using Transient Time Solver, I am facing many errors such as, a) floating point error b) Temperature AMG divergence c) Reversed flow

Introduction I am doing a Computational Fluid Dynamics Study on Dispersion of gases over buildings. The scenario that is portrayed would be in the event of an explosion, how would the plumes or ...
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21 views

Must I use viscoplastic model to fit the thermoplastic material

I need to do the simulation with a specified material. It is known as a thermoplastic. During the simulation, I need to define the material property. I need to choose whether it is viscoplastic or ...
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14 views

Why is this simulation not working in multisim? [duplicate]

I am trying to simulate this circuit, difference amplifier op amp circuit, which uses a 741 opamp and set the gain (i.e R2/R1) to be 1000. Assume that the maximum difference input (V2- V1) is ±5mV ...
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16 views

What is wrong with my difference amplifier op amp circuit simulation in multisim?

I want to simulate this difference amplifier op amp, using a 741 op amp, gain of 1000, difference input (V2-V1) is ±5mV and that the common-mode voltage is 2.5V. I am not too sure about the voltage ...
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39 views

Simulating fluid dynamics for Generative Design of water turbine in Autodesk Fusion 360 [closed]

I am trying to use Autodesk Fusion 360's generative design feature to produce more efficient turbine blades for hydroelectric power generators. How can I simulate the load of water-fall on a turbine ...
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1answer
62 views

Base Driven Tuning Fork Mechanical Response Spectrum

I am new to vibration analysis/simulation etc. so I may be missing something very basic here so please forgive me if I'm explaining things poorly or not making sense. To familiarize myself with ...
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1answer
27 views

What is the cycle of simulation editing?

So this is very general, but... How are simulations for vehicles done? I know that computational fluid dynamic simulations are used, but why are repeated tests of actual hardware done too? Obviously ...
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56 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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1answer
95 views

How to convert Joules(kinetic energy) plot chart into watts?

How to convert Joules(kinetic energy) plot chart into watts? Anyone know how?
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1answer
128 views

How should the assignment to test software for a vehicle’s VCU be aproached?

As a graduation project, I was assigned to solve the following problem: How can the vehicle’s behaviour be simulated in the form of a testing programme, with which the VCU software can be fully ...
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1answer
57 views

What standards exist regarding diagnostic systems in automotive engineering?

I'm designing a diagnostic system that simulates an environment and user input for a dummy vehicle. All possible critical situations are simulated in order to find out whether any errors are triggered,...
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38 views

Bolted joint junker test with finite element method

Anybody knows a tutorial to make a finite element analysis for bolted joints like junker test(fastener vibration) in Solidworks or Ansys?
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1answer
120 views

LS DYNA Material Model 163, Modified Crushable Foam

Question is on the meaning of input variable TID within material model 163 of LS-Dyna 971. Definition of TID variable. TID: Table ID defining yield stress versus volumetric strain at different ...
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1answer
52 views

Solidworks Motion capabilities

Is Solidworks Motion capable of finding the torque of the planet carrier (output) in a planetary gear set when in steady state? The sun and ring gears are both inputs and all gears are rotating at a ...
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2answers
326 views

Can Fortran 90 be used with Aspen Plus, or only Fortran 77?

I am attempting to write a user model in Fortran that can be connected to the Aspen Plus process simulator. Can Fortran 90 be used, or does Aspen only work with the older Fortran 77? I have checked ...
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1answer
64 views

simulation of an attitude optimal Backstepping controller based quaternion for a UAV in MATLAB

I'am trying to implement this open access research article Attitude Optimal Backstepping Controller Based Quaternion for a UAV I did not find the same result in this paper Can anyone tell me where my ...
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2answers
65 views

How to find the balance position of valve downstream a tank?

We have a tank which has a constant inflow of water (Qi). The level (h) of water in tank is controlled by opening/ closing (l) a valve downstream of the tank. Overflow height of the tank is 4 meter. I ...
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1answer
42 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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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 ...
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114 views

What constructive solid geometry CAD programs can accurately model and simulate structural rope, cable, pulleys, and dynamic motion elements?

It seems that flexible objects just don't model well in many popular constructive solid geometry (CSG) CAD programs. Most CSG modelers seem to assume exclusively rigid bodies with sharply defined and ...
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1answer
107 views

Problems regarding aspen simulation

I am trying to model water gas shift reactor on Aspen using an Rgibbs reactor. Unfortunately whenever i pass the stream into the reactor(HTS) the amount of CO and H2 both are increasing and C in the ...
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0answers
259 views

How to simulate an exhaust fan condition in ANSYS Fluent?

I'm trying to simulate a model which has one inlet and three outlets, and I'm passing air through it. Now, I want one of the outlets to have exhaust fan. I see options of exhaust fan and outlet-vent ...
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4answers
64 views

Software options for simulating oil flow in small diameter pipes [closed]

I'm looking for 1D software packages that can simulate flows of oil (lubricant) in pipes of a small diameter (typically between 1mm to 12mm in diameter) and have found around 10+ possible candidates, ...
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1answer
26 views

Suppliers who write dynamical specification inside their data sheet?

I am a beginner in control system for hydraulic servo systems. The reason why I haven't started yet to do simulations of hydraulic servo system is because I have no information about the components I ...
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31 views

Abaqus Milling Simulation

I'm creating a simulation in abaqus of a endmill removing material from and aluminium plate. The simulation is almost working, but only the surface level element are being removed from the plate. The ...
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1answer
142 views

Physics motion simulator for flying object

I want to see how different combination/position of fan on airplane affect stability of airplane. I need simulator to test one of the idea which involves specific position for propeller on the plane....
2
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1answer
80 views

What filter is this?

I am implementing a second order filter. It simulates hydraulic servo on an airplane. Its about 35-40 years old. What confuses me is the notation. Like "2(.7)(52)S", what does it mean? If its just ...
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2answers
29 views

Simulate Dust Layer on PV Cell?

Is it possible to simulate a layer of dust deposited on top of a PV cell in a controlled manner? One potential method I had was to put a given weight of a particulate/powder (chalk powder, talcum ...
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1answer
44 views

Mechanical Engineering- Modeling contact in Abaqus

I have simulated a 2D model in Abaqus which indicates 2 main part, first a sector that represent as wheel and, second a rectangular that represent rail. the wheel and rail are in contact and wheel ...
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14 views

Does excitation matter in a time-domain simulation/computation of a transfer function of an LTI system?

Let's say I am running a FDTD simulation of a wave-equation to determine a transfer function of an LTI system: \begin{equation} H(f) = \dfrac{Y(f)}{X(f)}\ \end{equation} where $Y(f)$ and $X(f)$ are ...
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102 views

Nonlinear simulation in ANSYS workbench

I'm trying to conduct a thermo-mechanical analysis in ansys workbench, I've been able to obtain some results using the transient thermal and static structural modules, however, I would like to perform ...
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22 views

How to calculate the Jacobi of electron/hole continuity equations for semiconductors with respect to potential when applying Newton's method?

These are the discretized drift diffusion equations as taken from the book "Analysis and Simulation of Semiconductor Devices" by Siegfried Selberherr. The electron continuity equation is: $$\begin{...
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1answer
38 views

How to implement a Monte Carlo Simulation for studying uncertainty in dynamic stiffness?

I have a dynamic mechanical system of the form: $$\mathbf{M{\ddot q}+{\Omega_c}G{\dot q}+{Kq}=F(t)}$$ and I need to introduce some uncertainty for the $K$ parameter, which is a symetric matrix of $q$ ...