# Tag Info

7

Yes, getting a second opinion can be useful. This is done routinely in weather forecasting where exact solutions are unknown, and there is some judgement about how to apply various factors. There will be less wiggle room in something like a finite element mesh stress analysis because the iterative equations for solving it will be basically the same no ...

7

Speaking personally (as someone who deals with this sort of thing for a US Class I on a regular basis) -- operational and maintenance personnel find railroad locations the same way you and I find highway locations -- milepost + track name, and named locations called "stations" in US railroad parlance. The former are not far off in usage from their highway ...

6

Summary: 1) The answer to this question is difficult. You would need to know how austenite and ferrite behave in relation to what you are doing to them. You would also need to know their compositions, temperature field, etc. The results here could vary significantly depending on the specific parameters and how they change with time and with each other. 2) ...

6

I write this from the perspective of an engineer who develops simulation software. I think the practice described is bad, and I recommend you do not use two different softwares to "confirm" the results. In general, two different modeling softwares can not be used to confirm much anything other than their similarity. Two softwares could easily both get two ...

4

Commercial air traffic is in pretty constant contact with air traffic control, and GPS is not the primary method of tracking aircraft position. This article, written in the wake of the MH370 disappearance, gives a pretty good rundown of how planes are tracked currently. The essence of it is that most air traffic control systems still rely on radar, whether ...

4

I think this is a good practice overall. By using two different softwares, you may be able two avoid two kind of errors: 1) errors that come from an inaccurate software (which should not be overlooked), 2) errors that come from the lack of habit of the user with the software (hidden options, default settings...). If the softwares are different enough, the ...

3

In most cases a position on the track will be most useful as GPS probably won't have high enough resolution to indicate which line it is on if there are several tracks in parallel. Also many signalling systems work by sectors where only one train is allowed to enter a given stretch of track at any given time. Similarly the precise location doesn't really ...

3

In structural analysis, one represents a real beam (or column, or any other "unidimensional" element) is represented by one or more bars. A bar is defined as a connection between two nodes. If you join all the horizontal bars into one, then you'll be stating that the left-most and right-most nodes (belonging to bars 1 and 24, respectively) are connected, but ...

3

your system of equations is underdetermined, which means that you don't have enough information to solve it. You can proof it by calculating the determinant. For a unique solution it has to be unequal zero. http://en.wikipedia.org/wiki/System_of_linear_equations For static problems the determination can be assessed by counting the degrees of freedoms and ...

3

Base on the information provide try shorting the jumpers on the 4D Systems LCD Display. As best as I know Android LCD cape only recognizes the LCD at a specific address. I believe there is EEPROM information in the LCD cape that is required to complete the android boot up process (Verification required for this sentence). Below is picture to help locate ...

3

I think the hint comes from the tab that says SOLIDWORKS in the left column, near the top of the block of actions. It's not visible in this screen shot, but is clearly visible in the video linked in the post.

2

Answer from the point of view of a Design Engineer Checking the results of one program against another will give you some level of certainty that the results are correct. It is unlikely to give you 100% certainty, but then that level of certainty is hard to achieve. A big issue I see is being able to transfer the model from one piece of software to another. ...

2

I concur with the other answers here, that this in general can be a good idea and will help ensure the accuracy of simulation results. In terms of how good it is in relation to the other verification methods, I'd say previously known results and physical tests are both better options if feasible, but hand calculations may require over-simplification if the ...

2

In short, by having them each as single members or beams should not be influencing the result provided that you have connected them together as fully fixed/welded (this is the member end condition - there should be no releases at the ends of the members so that the software will treat the individual members as one continuous member). Combining them into one ...

2

Okay, it took me way too long to figure this out. I'm thinking this is just not a very intuitive interface. Here's the fix for anybody else who makes it here. Click #1, Click #2 (carefully!), then check the box at #3.

2

The problem is relatively simple if the supports have infinite stiffness. The way to then solve it conceptually is to apply the principle of superposition to: (a) system with a support at $C$, applied force at $B$, and no constraint at $A$ $\rightarrow$ get deflection $\delta_{A1}$ at $A$; (b) system with force $F_A$ at $A$, reaction force at $C$, and no ...

2

I think your history isn't quite right here. The first widely-used CAD systems used Bezier curves, where the end points of each section do lie on the curve. For cubic Bezier curves, the intermediate points also lie on the tangent lines at the end of each segment. This corresponds quite closely to the constraints that are implied by using a physical drafting ...

2

You can remove the ".1" from the extension, so they are just .prt files - the .1 is to do with sequential numbering of backups, I believe. They can then be opened / converted using Autodesk Fusion 360, which is free for non-commercial use.

2

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 Transmission Control Unit. To keep a response short I have selected a Temperature gauge of the IPC. There is a very good chance this information communicated to the IPC ...

2

For Windows, Linux and Mac, Solvespace will allow one to create three dimensional objects in a parametric as well as free-form manner. Text and dimensions are part of the program's features. The web site provides tutorials and other useful reference material. If you did not have the requirement for dimensions, OpenSCAD would have been a good choice. There ...

2

The images references that you have provided look like they could have been produced in LaTeX, possibly using the TikZ package. Have a look at this example http://www.texample.net/tikz/examples/free-body-diagrams/ and this minimal introduction to TikZ to see if it can provide the functionality that you're after! http://cremeronline.com/LaTeX/minimaltikz.pdf ...

2

If you're interested in using Python, check out the pint, astropy.units or unyt packages. I have personally used pint + jupyter for day-to-day engineering in the past, and have looked at the others and they all should be suitable.

1

Since your project is defense software related I suggest taking a look at MIL-STD-498. The one that is close related to your question is SOFTWARE TEST PLAN (STP)

1

You don't need a computer program to solve this. You can almost do it in your head. The last equation is satisfied by any values of $x, y, z$ so you can forget about it. If you multiply out the first row of the matrix product, you get $$1 + 2.4 + x + 0 -5.6 + 0 + 0 = 0$$ which is pretty easy to solve for $x$. The second row is just as easy to solve for $y$...

1

You would need to create a whole new property package to use List 1 or 2 even if the EoS is the same as the initial one. There are a few times when this is impossible such as in Sulphur Recovery (Sulsim) or some Acid Gas properties. Also you should know you can share component lists with two property packages because there are times your reactor requires ...

1

Brute force: for (i1=0; i1<array.len-1; i1+=1) for (i2=i1+1; i2<array.len; i2+=1) if (same(array[i1], array[i2])) print(i1, "matches", i2) where same(a,b) compares the two matrices. Optimization: This is an order N² algorithm, so for very large values of "14" and "4" you'd want to optimize the process. Some possibilities (I'...

1

The solution to this, is simply to add the "embossed lines" before the bend. Have a look at the modelling process below: Extrude a flat plate. Because this model will be symmetrical this is only half the size of the final object. Extrude a 'master rib'. This is 0.1mm away from the YZ plane, so that there's an 0.2mm gap once it's mirrored Pattern the rib ...

1

I don't see why Civil 3D doesn't meet your needs. It can accomplish and automate everything you've specified apart from visually identifying and marking the problem areas. Drawing Setup You can start by creating a template and setting up all the layers and line work etc for your areas and for every task you create your drawing starting with the template. ...

1

Your best bet, if Control Panel/Add or Remove programs isn't working, is to navigate to your STEP 7 Micro/WIN directory in the Windows Explorer and delete it (default directory: C:\Program Files\Siemens\STEP 7 MicroWIN V4.0). To remove the registry items associated with STEP 7: Go to: HKEY_LOCAL_MACHINE \ Software \ Microsoft \ Windows \ CurrentVersion \ ...

1

I know it is not what you asked, but you could take the intake air below ground, 2m down for example, and benefit from the ground temperature compared to the ambient air temperature - called a "puit canadien" and i did this for a 4 bedroom house in Switzerland - needed 30m of pipe 2m down plus a heat exchanger as @Brian Drummond . Helps in summer to reduce ...

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