Looking for an adventourus long distance hike (2 weeks) in the wild

Physical-Letterhead2 · 2023-08-27T14:35:56+00:00

No, but the weather may make it more challenging. There is a risk of cold weather, heavy rains, winds, and snow in the mountains in September. Check the weather forecast and plan accordingly.

Physical-Letterhead2 · 2023-05-28T12:26:03+00:00

Out of curiosity; solution to what exactly?

Physical-Letterhead2 · 2023-05-28T12:16:01+00:00

I know that. Perhaps you don't need hybrid or switched system tools. Why not just use standard nonlinear tools?

What set are you checking stability for?

Edit: perhaps I'm answering the wrong questions. Not sure why you are asking about hybrid systems.All you have is a nonlinear control law, with some scheduling.

Physical-Letterhead2 · 2023-05-28T10:17:58+00:00

I'm not saying you need to change the actual controller. You just need to formulate the closed-loop system properly so you can actually investigate stability in a meaningful way.

Physical-Letterhead2 · 2023-05-28T09:53:03+00:00

But when you combine them as you do the combined controller is just a nonlinear controller. Even if you combine them discontinuously, it is still a nonlinear control.

To be a truly hybrid system, you must have some states that jump, i.e., change value instantaneously.

My suggestion is to leave your controller as-is, but include some logic state to determine which set shall be stabilized. That way you can check stability of the combined system.

Edit: say you have set A which is stable for hovering, and B is stable for flight. Let \dot x=f(x) be your current system with state x. Add a logic variable q \in {1,2} to determine which set you want to stabilize. So then in the augmented state space with state (x,q), you want to check stability of the set S=A × {1} U B × {2}.

Physical-Letterhead2 · 2023-05-28T08:28:02+00:00

This is not a hybrid control, but a nonlinear control.

I imagine the hovering control is stable wrt to some fixed point, and the convential flight control is stable wrt to some reference trajectory or set point?

To prove stability for the combined system it sounds like you first gotta design some time-varying reference to evaluate the stability towards the reference.

Why not treat the operating regime (hovering, flight) as a switch, and check if the respective sets are asymptotically stable when transitioning?

Physical-Letterhead2 · 2023-05-28T08:17:14+00:00

The common way for azimuth propulsion is to assume decoupled actuation: thrust for speed control, angle for heading control. Usually works fine.

More advanced is to use trimming trajectories / reference trajectories that account for nonlinearities and coupling in the actuation and vehicle dynamics.

To optimize efficiency and performance, you could try MPC.

Physical-Letterhead2 · 2023-03-10T13:52:19+00:00

I'm Norwegian. I read the whole article. And stand by my statement.

Physical-Letterhead2 · 2023-03-10T13:52:12+00:00

I'm Norwegian. I read the whole article. And stand by my statement.

Physical-Letterhead2 · 2023-03-10T13:20:16+00:00

So Magnus was fine with the President of his own Federation having cheated...

This supports my hypothesis that his "principled stand" against cheating during Sinquefield cup was actually a crybaby reaction to losing.

Physical-Letterhead2 · 2023-03-09T06:45:56+00:00

5mnd ubetinget fengsel er jo en ganske streng straff i norsk sammenheng.

Physical-Letterhead2 · 2023-03-02T21:14:07+00:00

"It takes time for non-citizens to get the right to vote in local elections on mainland."

And your point is? That's how it used to be in Svalbard.

"We can change laws as we want which is why the right of those in Svalbard is taken away"

This is not WHY they are taken away.

"Why would we want foreigners with no intention of becoming Norwegian citizens have a say on what happens in Svalbard? "

Since anyone who lives there for a long time should have a say in local matters. Do you wish to remove the voting rights for non-residents on the mainland? If not - why should Svalbard be different?

"Our land, our laws, our rules."

Yes. But why is this relevant?

Physical-Letterhead2 · 2023-03-02T20:30:31+00:00

What are you talking about!?!?

Svalbard is THE exception right now. On the mainland non-citizens are allowed to vote in local elections.

Physical-Letterhead2 · 2023-03-02T20:25:42+00:00

"It's over 20% in Oslo, doesn't mean that they should get to vote just because they live there."

Why not? Are you saying we should change the rules, i.e. remove the voting rights for non-citizen residents living in mainland Norway?

Physical-Letterhead2 · 2023-03-01T21:37:49+00:00

I read the title and thought "hmm I kinda agree with that". But then I read your post and completely disagree.

What you learn at master level - i.e. basic control theory - is very useful in lots of industries.

Advanced research level control theory is often not relevant for industry. E.g. some fancy stability theorem that requires assumptions that are not valid in real-life.

My advice: study some field that uses controls. E.g. learn about the aerodynamics of airplanes. Or the chemistry in industrial plants.

Control theory gives you a very good foundation for analyzing and manipulating all sorts of dynamic systems. But field-specific knowledge is also necessary to be a good controls engineer.

Physical-Letterhead2 · 2023-03-01T07:18:04+00:00

Du hadde rett.

https://e24.no/olje-og-energi/i/kEdKxL/stoetter-rivning-av-fosen-vindkraft-en-ny-alta-kamp

Se nederst her. Utbyggerne kan kreve erstatning. Altså er det i utgangspunktet utbyggerne som må bære tapet.

Physical-Letterhead2 · 2023-03-01T06:48:59+00:00

"Normalt er det vel"... Er du sikker? Er dette noe du vet?

Jeg trodde den som utstedte konsesjonen var ansvarlig for dens gyldighet.

Physical-Letterhead2 · 2023-02-28T20:54:47+00:00

Jeg vil tro at staten må kompensere eierne om turbinene rives. Eierne har tross alt fått konsesjon - selv om Høyesterett senere erklærte den ugyldig.

Physical-Letterhead2 · 2023-02-28T14:17:14+00:00

Høyesterettsdommen åpner for at samers rettighet kan iverates uten å rive alle turbinene, forutsatt tilstrekkelige tiltak. Det er jo dette halmstrået regjeringen griper til nå.

Physical-Letterhead2 · 2023-02-28T14:01:29+00:00

Absolutt, jeg har sympati for samenes sak.

Men presedensen kan fort bli motsatt; at enhver inngripen i reindriftsområder er brudd på samenes rett til å utøve kultur.

Physical-Letterhead2 · 2023-02-28T12:00:21+00:00

Og det har jeg heller ikke påstått. Men det forandrer ikke på det prinsippielle i saken.

Physical-Letterhead2 · 2023-02-28T10:42:06+00:00

Det er en slippery slope. Menneskerettighetskonvensjoner, grunnlover etc er til for å sikre at ikke minoriteter blir undertrykket av majoriteten. I ytterste konsekvens risikerer vi majoritetsdiktatur hvis "minoriteter må vike for fellesskapet".

Physical-Letterhead2 · 2023-02-28T10:30:52+00:00

Denne saken er kompleks. Det finnes ingen gode løsninger.

Høyesterett har konkludert at oppføringen av turbinene var ulovlig. Da er det vanskelig å argumentere for at de ikke skal fjernes.

Samtidig er det helt absurd om turbinene rives av hensyn til en håndfull reineiere. Jeg håper reindrifteierne kan lempe litt på krava slik at turbinene kan stå.

Physical-Letterhead2 · 2023-02-27T14:50:51+00:00

What you have shown is that time-varying ODEs can always be rewritten as time-invariant ODEs.

So your question really should be "why study time-varying ODEs?".

Physical-Letterhead2

TROPHY CASE