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US 5,767,381 AGranted
Centrifuge model test apparatus
AssigneeHitachi, Ltd.
InventorsTakao Konno, Masaharu Sugano, Yuji Tadano
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AssigneeHitachi, Ltd.
InventorsTakao Konno, Masaharu Sugano, Yuji Tadano
Estimating the term…
A centrifuge model test apparatus is accommodated in a pit, and comprises a vertical rotary shaft, a rotary arm horizontally secured to the rotary shaft, a swing bucket suspended from and supported at a pin on the rotary arm and located near the end thereof so as to be movable in the radial direction of the rotary arm or fixed, and a drive unit for rotating the rotary shaft. As the drive unit is driven and the rotational speed of the rotary shaft increases, the swing bucket is raised together with a sample contained therein due to the centrifugal force with the pin as a center and is placed at a nearly horizontal position when a predetermined rotational speed is reached. A partitioning plate provided under the swing bucket is moved upwards at the time when the swing bucket is raised, and the volume and surface area of the space defined by the partitioning plate and the pit reduce, and the frictional force due to the resistance of the air decreases. This makes it possible to increase the radius of the rotary arm or the load weight on the sample without increasing the driving force. As the rotary arm is made of high damping and easily welded material, vibration caused by resonance can be reduced when the testing apparatus of the centrifuge model is operated with a vibration generating device installed in the testing apparatus.
A centrifuge model test apparatus comprising a rotary arm horizontally secured to a vertical rotary shaft, a swing bucket for holding a sample suspended from and supported by the rotary arm so as to swing, a drive unit for rotating the rotary shaft, a partitioning means provided under the rotary arm, and a moving means to move the partitioning means up and down so as to reduce a distance between said partitioning means and said rotary arm when a rotational speed of said rotary arm increases.
A centrifuge model test apparatus comprising a rotary shaft provided substantially vertically, a rotary arm substantially horizontally secured to the rotary shaft, a swing bucket suspended from a supported by the rotary arm so as to swing and holding a sample, a drive unit for rotating the rotary shaft, a partitioning means provided under the rotary arm, a sealed bucket for holding a fluid is provided under the partitioning means, and a fluid feed source to feed a fluid is provided to the sealed bucket to inflate the sealed bucket and raise the partitioning means so as to reduce a distance between said partitioning means and the rotary arm when a rotational speed of the rotary arm increases.
A centrifuge model test apparatus comprising a rotary shaft which is substantially vertical, a rotary arm substantially horizontally secured to the rotary shaft, a swing bucket for placing a sample suspended from and supported by the rotary arm to rotate in the direction of the rotary arm, a drive unit for rotating the rotary shaft, a lower disk and an upper disk arranged respectively at a lower portion and an upper portion of the rotary shaft, and space control means connected to the lower disk for, as the rotational speed increases and the swing bucket is raised, decreasing space formed between the rotary arm and the lower disk to be smaller than that taken up before the swing bucket is raised, before the rotary arm reaches a predetermined rotational speed.
A centrifuge model test apparatus comprising a rotary arm horizontally secured to a vertical rotary shaft, a swing bucket for holding a sample suspended from and supported by the rotary arm so as to swing, a drive unit for rotating the rotary shaft, and partitioning means provided under the rotary arm, wherein the partitioning means moves vertically so as to reduce a distance between the partitioning means and the rotary arm when a rotational speed of the rotary arm increases, and wherein said rotary arm is made of a Fe--Ni--Mn alloy and the alloy has an austenic phase, a ferritic phase and a quasi stable phase.
A centrifuge model test apparatus, comprising
Dependencies are inferred from the claim text.