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Hillhouse, Grady
Remove constraint Creator / Instructor: Hillhouse, Grady
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Video
The vast majority of our grid-scale storage of electricity uses this clever method. Electricity faces a fundamental problem that comes with pretty much any product that’s provided on-demand: our ability to generate large amounts of it doesn’t match up that closely with when we need it. The storage of electricity for later use, especially on a large scale, is quite challenging. That’s not to say that we don’t store energy at grid scale though, and there’s one type of storage that makes up the vast majority of our current capacity.
- Subjects:
- Environmental Engineering, Hydraulic Engineering, and Mechanical Engineering
- Keywords:
- Energy storage Water-power Pumped storage power plants
- Resource Type:
- Video
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Video
Wind can be one of the most critical and complicated loads on civil structures. The case of the Tacoma Narrows bridge is a well-known cautionary tale that’s discussed in engineering and physics classrooms across the world. Both resonance from vortex shedding and aeroelastic flutter contributed to the failure. When you push the envelope, you have to be vigilant because things that didn’t matter before start to become important (e.g. wind loads on lighter structures). Unanticipated challenges are a cost of innovation and that’s something that we can all keep in mind.
- Subjects:
- Structural Engineering
- Keywords:
- Washington (State) -- Tacoma -- Tacoma Narrows Bridge (1940) Suspension bridges Wind-pressure
- Resource Type:
- Video
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Video
This video shows how simple reinforcement is used to prevent collapse of rock tunnels. Tunnels play an important role in our constructed environment as passageways for mines, conveyance for utilities, and routes for transportation. Rock bolts are a type of reinforcement for stabilizing rock excavations, usually made from steel bars or bolts. This simple construction method dramatically reduces the cost of making tunnels through rock safe from collapse.
- Subjects:
- Structural Engineering
- Keywords:
- Underground construction Rock bolts Tunneling Tunnels
- Resource Type:
- Video
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Video
This video shows more destructive testing to answer your questions about concrete. Concrete's greatest weakness is its tensile strength, which can be less than 10% of its compressive strength. So, we often reinforce it to create a composite material strong against all types of stress. This video briefly touches on conventional rebar and prestressed/post-tensioned reinforcement.
- Subjects:
- Building and Real Estate
- Keywords:
- Reinforced concrete Concrete
- Resource Type:
- Video
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Video
This video explains why ridges move, and other musings on thermal movement of large civil works. Most people have a certain intuition about thermal expansion, but you may not have considered how engineers design to accommodate it on large civil structures. The video gives a quick overview on this important consideration that engineers must account for when designing infrastructure like pipelines, bridges, and even sidewalks.
- Subjects:
- Structural Engineering
- Keywords:
- Structural analysis (Engineering) Expansion (Heat)
- Resource Type:
- Video
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Video
A weir is a small dam built across a river to control the upstream water level. Weirs have been used for ages to control the flow of water in streams, rivers, and other water bodies. Unlike large dams which create reservoirs, the goal of building a weir across a river isn’t to create storage, but only to gain some control over the water level. Over time, the term weir has taken on a more general definition in engineering to apply to any hydraulic control structure that allows water to flow over its top, often called its crest. In fact, the spillways of many large dams use weirs as control structures. So how do they work?
- Subjects:
- Hydraulic Engineering
- Keywords:
- Dams Hydraulics Weirs
- Resource Type:
- Video
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Video
In many of the world’s tallest skyscrapers, there’s a secret device protecting the building and the people inside from strong motion due to wind and earthquakes. Did you know you can tune a skyscraper just like a guitar? In this video, we’re comparing theory to the real world for tuned mass dampers. Luckily this tech is simple enough that we can model it right in the garage. As silly as this little experiment looks, it’s actually not that far off from what engineers do in the real world (maybe without the googly eyes). The design phase for just about every major building includes some physical scale model tests. This video shows that the tuned mass damper is a great example of elegance in engineering.
- Subjects:
- Structural Engineering
- Keywords:
- Tuned mass dampers Buildings -- Earthquake effects Buildings -- Vibration
- Resource Type:
- Video
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Video
Engineers need to be able to predict how water will behave in order to design structures that manage or control it. And fluids don’t always behave the way you’d expect. On this episode, we’re talking about one of the most interesting phenomena in open-channel flow: the hydraulic jump.
- Subjects:
- Hydraulic Engineering
- Keywords:
- Hydraulics Hydraulic jump
- Resource Type:
- Video
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Video
Hydraulic transients (also known as water hammer) can seem innocuous in a residential setting, but these spikes in pressure can cause major damage to large pipelines and industrial pipe networks. In this video, we briefly discuss how water hammer occurs and how engineers mitigate the effect.
- Subjects:
- Building Services Engineering
- Keywords:
- Water hammer Hydraulic transients Fluid mechanics
- Resource Type:
- Video
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Video
A few things that can go very wrong when you put steam in a pipe. We talked about the damaging effects of water hammer, but there’s another state of H2O equally if not more dangerous when put in pipes. In this episode, we’re talking about steam hammer and differential shock.
- Subjects:
- Building Services Engineering
- Keywords:
- Piping Fluid dynamics Pipelines
- Resource Type:
- Video
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