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8 votes
Accepted

What filter is this?

It might be written that way because the transfer function of a second order system is written as: $$ h(s) = \frac{\omega_n^2}{s^2 + 2\zeta \omega_n s + \omega_n^2} $$ where $\zeta$ is the relative ...
Mika Sundland's user avatar
5 votes
Accepted

Where does weight mass conversion ratio '0.00259' come from in Nastran?

It's the inverse of the acceleration of gravity g in imperial units. $$ 1 g = 386.1 in/s^2 $$ $$ 1/g = 0.00259 s^2/in $$ You need that since: $$ weight = mass * g $$
Repiklis's user avatar
  • 176
4 votes

How much force can a pole in ground take before falling?

this is a typical engineering problem and has an equation approved by IBC numbered 18-1. $$d = 0.5 A{1 + [1 + (4.36h/A)]1/2}$$ The calculation process is I first calculate A =2.3* post load/(allowed ...
kamran's user avatar
  • 22.4k
4 votes

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

To convert a plot of J versus s to a plot of J/s vs s, take the derivative. Here is my quick-and-dirty answer after digitizing the data.
Jeffrey J Weimer's user avatar
3 votes

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

My advice would be to forget about the mathematical theory and start thinking about what the engineering means. It's hard to think of any situation where the stiffness of a sensibly designed structure ...
alephzero's user avatar
  • 12.5k
3 votes
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Non-Clutch Vehicle Drivetrain - How Does it Work?

Conventional automatic transmissions have a torque converter which uses a viscous rather than a rigid coupling to connect input and output. This performs a similar function to a friction clutch but ...
Chris Johns's user avatar
  • 15.2k
3 votes
Accepted

ANSYS Workbench/Mechanical: Automatically export chart?

There are several options for doing this: If there are only a few values to be saved per design point, you could use 'output parameters'. If there is a lot of data to be saved, the report generator ...
Orbit's user avatar
  • 156
3 votes

How to determine time taken for tyre to deflate using CFD analysis?

I don't think CFD is the right tool. You can use an orifice equation, say from ASME, to calculate flow rate from inner and outer pressure. This takes the form of: $$\dot{m}=\frac{EC_D}{\sqrt{1-\beta^4}...
RC_23's user avatar
  • 781
2 votes

SolidWorks circuit simulation?

CircuitWorks doesn't simulate the electronics; it just integrates between some common PCB design software formats and SolidWorks for mechanical information. For example, maximum component height, ...
Jon Watte's user avatar
  • 328
2 votes

How can I save mass, inertia, joint location and part orientation data from any 3D-CAD program to a CAD file?

This sounds like the exact synopsis of my masters thesis. Theoretically a format that can contain this info exits. STEP could include this information, but since the exporter has some serious leeway ...
joojaa's user avatar
  • 3,577
2 votes

Component-based simulation versus block-based simulation

Components have connections that can be either inputs or outputs, while blocks have defined inputs and defined outputs. With the components you can have bidirectional causality while if you want to ...
Rick's user avatar
  • 1,335
2 votes
Accepted

How much force can a pole in ground take before falling?

Depending on the kind of engineer you ask you will get many different options to approach this - your question is pretty open-ended. As a Geotechnical Engineer I'd say your pole can be looked at as a ...
ptev's user avatar
  • 36
2 votes

Simulation of motion, collision, friction and thermal expansion in 3D

This is a multi-physics analysis, there are some open source packages though i'm not familiar with them (OpenFOAM is open source CFD software, and COMSOL is example of an commercial multi-physics ...
Diesel's user avatar
  • 622
2 votes
Accepted

LS DYNA Material Model 163, Modified Crushable Foam

While the yield stress is a well defined point in materials such as steel or other metals, that is not the case when we talk about foams. Here they are calling "yield stress" to the whole volumetric ...
user3408085's user avatar
2 votes

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

I am not too familiar with the VCU, PV780, or PowerVision. Based on your description PV780 can be configured to be the Instrument Cluster Panel (ICP) for Engine Control Unit/Module (ECM) or ...
Mahendra Gunawardena's user avatar
2 votes

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

Verify your model against actual physical hardware. If you're sure of parts of the model, and unsure of others, then just verify the parts you're worried about. If the physical hardware is big and ...
TimWescott's user avatar
  • 2,682
2 votes
Accepted

Calculating final drive force from engine torque and tyre spin ratio

You need to convert the torque at the axle into force against the ground through the tire (Force = torque/radius). Then F=ma for the entire mass of the car (plus if you want to be precise the ...
Tiger Guy's user avatar
  • 6,901
2 votes
Accepted

Is a MSC Adams simulation with smaller steps always more reliable?

This is a common issue on all numerical methods (not just multibody problems), i.e. the tradeoff between the following three types of error: Round off error Discretization Truncation (sometimes the 2 ...
NMech's user avatar
  • 24.3k
2 votes

Simulation of RC circuit using Proteus

Try using a replacing a 9V VDC voltage source with a VAC voltage source. Pay attention to the frequency of the VAC voltage source. This should address the issue. With regard to determining the time ...
Mahendra Gunawardena's user avatar
2 votes

What meaning does the following sine wave have when it comes to amplitude?

It means that there is a positive offset of one. So your signal is $$ x(t) = 1 + 2 \cdot \sin(\omega t)$$ where: 1 is the offset 2 is the amplitude of your signal (not 4).
NMech's user avatar
  • 24.3k
2 votes
Accepted

Modeling a simple capacitor

Capacitance only depends on its geometry, ... False. Capacitance is also determined by the dielectric (the insulator) between the plates and this can have a huge effect on the value obtained. ... ...
Transistor's user avatar
  • 10.8k
2 votes

Non-Linear Analysis Convergence Problem in Ansys

Your model contains a lot of nonlinearities, therefore achieving convergence is not easy. I would try gradually adding each nonlinearity to narrow down where the solver is struggling: turn off large ...
meshWorker's user avatar
2 votes

Simulating production of a product by a machine

A single machine with no input constraints can be modeled as an average. First of all, if you're going to model manufacturing, model shifts that make sense to people in manufacturing. Shifts in ...
Tiger Guy's user avatar
  • 6,901
1 vote

Solidworks Flow Simulation the Rotation option missing

Make sure that your unit system and parameters are properly defined (you'll want "SI"), you have saved your file, and also that you have selected the object(s) before clicking the wizard. If this ...
Jason's user avatar
  • 165
1 vote

Software options for simulating oil flow in small diameter pipes

As for your need, as mentioned by Solar Mike, I believe OpenFOAM is the best option as there wouldn't be any issues for licence cost as well , since it is an opensource CFD platform. You can ...
anshul suri's user avatar
1 vote

Software options for simulating oil flow in small diameter pipes

I've used Daxesoft's Pipeflow Software before - it's capable, but a little pricey at ~£1000 ($1380 US) per licence. It comes with a fairly comprehensive database of pipes, pipe fittings and fluids, ...
Jim Hargreaves's user avatar
1 vote

Software options for simulating oil flow in small diameter pipes

Pipe-flo is a good commercial tool for what you describe. https://eng-software.com/products/pipe-flo/
Ohio ChemE's user avatar
1 vote

Software options for simulating oil flow in small diameter pipes

As far as I understand any CFD package worth its name can model fluid flow - you just have to specify the fluid characteristics for that fluid. As for size, that should not be an issue - some ...
Solar Mike's user avatar
  • 15.8k
1 vote
Accepted

Suppliers who write dynamical specification inside their data sheet?

The dynamics you’re looking for are largely governed by how you connect the different components in your design. Although the hydraulic pump you select is important, the equations provided in the ...
user883521's user avatar
1 vote

Physics motion simulator for flying object

I recommend researching a few different plane designs in terms of propeller(not fan) layout, and you'll most likely have your answer. AFAIK, a prop at the back is more efficient, a prop at the front ...
Bart's user avatar
  • 1,184

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