Floating Vessel Stability
Floating Vessel Stability - Related Videos
13:10
Stability of Floating Vessels
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2023
Source: Alexander S Rattner and Kevin Rao Li Department of Mechanical and Nuclear Engineering, The Pennsylvania State University, University Park, PA The objective of this experiment is to demonstrate the phenomenon of stability of floating vessels - the ability to self-right when rolled over to the side by some external force. Careful design of hull shapes and internal mass distribution enables seagoing vessels to be stable with low drafts (submerged depth of hull), improving vessel...
01:11
Buoyancy and Stability for Submerged and Floating Bodies
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2025
In fluid mechanics, buoyancy and stability are key concepts for understanding the behavior of submerged and floating bodies. When a stationary body is fully or partially submerged in a fluid, the fluid exerts a force on the body known as the buoyant force. This force acts vertically upward through a point called the center of buoyancy, which is the center of the displaced fluid volume. According to Archimedes' principle, the magnitude of the buoyant force is equal to the weight of the fluid...
04:20
Isolating Mouse Brain Vessels: A Protocol to Isolate Intact Vessels from Murine Brain Sample
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2025
This video demonstrates the isolation of intact vessels from a mouse's brain that constitute the blood-brain barrier (BBB) along with neurons and glial cells. The isolated vessels can be used as an in vitro model to study their role in maintaining brain homeostasis.
03:18
Nuclear Stability
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2020
Protons and neutrons, collectively called nucleons, are packed together tightly in a nucleus. With a radius of about 10−15 meters, a nucleus is quite small compared to the radius of the entire atom, which is about 10−10 meters. Nuclei are extremely dense compared to bulk matter, averaging 1.8 × 1014 grams per cubic centimeter. If the earth’s density were equal to the average nuclear density, the earth’s radius would be only about 200 meters. To hold positively charged protons together in the...
01:53
RNA Stability
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2019
Intact DNA strands can be found in fossils, while scientists sometimes struggle to keep RNA intact under laboratory conditions. The structural variations between RNA and DNA underlie the differences in their stability and longevity. Because DNA is double-stranded, it is inherently more stable. The single-stranded structure of RNA is less stable but also more flexible and can form weak internal bonds. Additionally, most RNAs in the cell are relatively short, while DNA can be up to 250 million...
FAQs
Metacentric height is a key measure used to evaluate how the relationship between a vessel’s center of gravity and shifting center of buoyancy produces a restoring moment after heeling. Its value changes the predicted response to tilt, so engineers consider it when assessing hull designs, loading conditions, and the vessel’s tendency to return toward an upright position.
Weight distribution affects the location of the vessel’s center of gravity, which determines how gravity interacts with buoyancy during a heel. Concentrating or shifting weight can therefore change the restoring moment and the predicted resistance to capsizing. Engineers evaluate cargo placement, ballast, and other loading arrangements to maintain acceptable stability under operating conditions.
Free-surface effects are included because liquid conditions within a vessel can influence its stability during heeling. They are evaluated alongside weight distribution, metacentric height, and loading conditions rather than treated as an isolated concern. Accounting for them helps engineers produce a more realistic prediction of the vessel’s response when cargo, ballast, or onboard liquids change.
These conditions can change the vessel’s loading state, heel, or submerged geometry, affecting the centers of gravity and buoyancy and the resulting restoring moment. Stability analysis therefore examines more than an ideal upright condition. By considering environmental forces, movement of loads, and flooding scenarios, engineers can identify conditions that may increase the risk of excessive heeling or capsizing.
An assessment requires the vessel’s loading condition, weight distribution, ballast arrangement, and relevant free-surface effects. Engineers then examine how the submerged volume and center of buoyancy change as the vessel heels, using metacentric height and restoring behavior as evaluation factors. The analysis can also include expected wind, waves, shifting loads, and flooding conditions.
Engineers apply stability analysis during hull design and when planning cargo, ballast, and operating conditions. The results help predict how a ship, boat, or other buoyant structure will respond to heeling forces and changing loads. This information supports decisions intended to reduce capsizing risk while maintaining safe performance in waves, wind, and potential flooding situations.