Is there a specific part of mechanical engineering? It's barely a single field: Thermo, fluid dynamics, structural engineering, dynamics and controls, robotics - basically "engineering while atoms that don't involve chemical or biological reactions."
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I'm sort of asking the original question to understand how to answer this question. I realized I don't understand the field's shape, and I imagined that by reading about the foundational questions, I'd be able to see some of the decomposition.
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Modeling & controlling hybrid systems like walking robots, whose combination of continuous dynamics (e.g. pendulum swing) and discrete dynamics (e.g. heel strike) are devilishly hard to deal with. Boston Dynamics takes a trial-and-error approach. Others are more mathematical.
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The transition between turbulent and laminar flow. Everything else is "an implementation detail"

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That was overly snarky.
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I've been seeing a lot of stuff on using ML tricks to linearize particularly gnarly differential equations
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eg: dynamic mode decomposition
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How to model friction
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Two that interest me: Rapidly changing material science and harnessing potential of multi material, volumetric material and shape as part of dynamic systems. Second, convergence of mechanical, electrical and software systems.
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Should it still be a standalone field or should it become a minor subset of applied of comp sci? (src: 2 degrees, 10 years practicing ME)
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