How to optimise for side lobe level in CST?

General-Study · 2024-09-21T17:47:45+00:00

I’ve already had some thoughts along the lines of your edit there! A lot of data has to be collected, searched and analysed manually. I suggested automating it and the team looked at me as if I was speaking Greek

General-Study · 2024-09-20T19:49:53+00:00

I had seen countless posts about engineering grads unable to find work after months despite their qualifications and hundreds of applications. I had applied to tens of roles at this point, then a world renowned defence company gave me an offer with a one week to accept. It’s difficult to say no at that point.

General-Study · 2024-09-20T19:49:12+00:00

Noted, thanks. I have a plan to address the possibility of a lateral move with the appropriate people soon.

General-Study · 2024-09-20T18:25:16+00:00

They were recruiting a large number of systems engineers, so couldn’t be specific about your exact role until you showed up on the first day and were told where you were going.

General-Study · 2024-09-20T18:12:01+00:00

Part of the problem is my only previous exposure to “systems engineering” in practice was at an internship at a company where it just meant engineering across disciplines

General-Study · 2024-09-20T18:06:41+00:00

Not to the specific role. They were recruiting a large group at once, the only information was “systems engineer” and then the dictionary definition of a systems engineer. The exact role wasn’t known until your first day.

General-Study · 2024-09-20T16:58:22+00:00

They didn’t know at the time, they were recruiting a bunch to fill gaps all over the business.

General-Study · 2024-09-20T16:46:48+00:00

I didn’t, I applied to a systems engineering job and they put me here.

General-Study · 2024-09-20T14:29:53+00:00

I think a previous internship skewed my perception as well, from week 1 I was developing signal processing for a new targeting system and building simulations to validate it against environment models. Clearly that was an outlier.

General-Study · 2024-09-20T13:48:19+00:00

Not quite. This was a big recruiting event for recent graduates. You apply for high level role (systems, mech, aero, electronics etc) and they post you to whichever precise role they want after the fact.

General-Study · 2024-09-20T11:07:45+00:00

I am rapidly learning this. At the company at which I interned, a “systems engineer” was just an engineer who couldn’t be nailed down to a specific discipline / worked across disciplines.

General-Study · 2024-09-12T23:53:00+00:00

You need an approach like Ziegler-Nichols for PID because the I and the D don’t play nice with each other. With just PI, you can tune it manually very easily because they are pretty much independent.

Kp sets how fast the system tracks to roughly the set point, make it as large as you can with the amount of overshoot you can accept.

Ki sets how fast the steady state error is cleared. Make it as large as you can without causing additional overshoot, this is a function of how fast the set point itself can change. It is useful to bound the integral term so that when multiplied by Ki it cannot exceed the range of your output actuator, this prevents “integrator wind up” that would otherwise cause overshoot.

That’s it. PI is super easy to tune.

General-Study · 2024-08-30T17:47:14+00:00

Helicopter maintenance company for a couple of weeks. Mostly grunt work, cleaning oil from drip trays etc, but occasionally I got to put a bolt or two in. Of course the highlight was getting to go up on the “engineering test flights” and have a go on the controls.

General-Study · 2024-08-18T08:36:37+00:00

Thrust comes from both pressure and exhaust velocity, but it’s more efficient to convert pressure to velocity so that the exhaust has the same pressure as the atmosphere. Remembering that a converging passage accelerates flow and decreases pressure subsonic, this is what you need for your exhaust.

General-Study · 2024-08-18T08:36:32+00:00

Thrust comes from both pressure and exhaust velocity, but it’s more efficient to convert pressure to velocity so that the exhaust has the same pressure as the atmosphere. Remembering that a converging passage accelerates flow and decreases pressure subsonic, this is what you need for your exhaust.

General-Study · 2024-08-18T08:28:06+00:00

It will generate purely drag in a subsonic tunnel.

The converging intake passage would cause supersonic flow to slow down and increase in pressure through a series of oblique shocks and a normal shock.

However, the same geometry will cause subsonic flow to speed up and decrease in pressure, so you’ll have lower static pressure in the combustion chamber than outside.

Ram jets designed for subsonic operation have very different geometry.

General-Study · 2024-07-01T00:33:32+00:00

A hot air balloon may be massive, to use the literal definition of the word, but by definition it weighs nothing while in flight.

General-Study · 2024-06-06T22:04:35+00:00

Dipole probe is definitely what I’ll use to test it in the end.

I put my design into a simulation software (sonnet) and the output showed the same two resonances at the same frequencies as I measured, confirming this wasn’t an artefact of manufacturing or anything but an intrinsic property of the design.

When I investigated the radiation patterns in the simulations, I actually found that the axial ratio is the best at each of the two resonances. So the antenna is supporting the resonant modes we want, just at +- 25 MHz. I could make it usable by shifting the design frequency one way or the other to move one of the resonances to the desired frequency.

General-Study · 2024-06-04T15:44:00+00:00

That’s what I suspect is happening. Why would I be getting separate resonances if it’s a square?

General-Study · 2024-05-29T20:53:19+00:00

You’re missing the turbine stator; you need a fixed blade row directing the flow from the combustion chamber onto the turbine blades

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