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Centrifuge
Containers |
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The containers use
two hydraulic cylinders to produce localized shear strains along one
or two vertical interfaces in a soil model while being spun at centrifugal
accelerations of up to 75g. Load cells directly connected between
each actuator and the movable portions of the container measure the
shearing force applied by the actuators. The maximum achievable displacement
is 8 cm (6m prototype units). Motion of each actuator is precisely
controlled using a servo-valve and feedback control system. Using
a function generator or computer equipped with a DAC interface board,
a variety of input strain distributions and time histories can be
created. The container will be manufactured from high-strength aluminum
alloy. The moving portions of the container are supported and guided
using roller bearings to provide precise movement with minimal friction.
The sliding interface between the fixed and movable portions of the
container utilizes low-friction Teflon seals protected by steel shields.
When used with a suitable Teflon sheet liner, this design effectively
excludes soil from the interface, maximizing the service life of the
seals. One container will have three sections having two actuators
and a two-channel displacement control system. In this concept, one
section will be fixed, and either one or both of the other sections
can be moved. If two sections are moved, they can be moved either
together or independently. In this way a wide variety of strain configurations
can be modeled.
Centrifuge Containers |
Performance Specification |
Split Boxes |
Overall dimensions:108 cm L x 69 cm W x 36 cm H;Inside container
dimensions: Model dimensions of 100 cm L x 36 cm W x 20 cm
H; Prototype dimensions at 75g of 75m x 27m x 15mEmpty weight
of 900 NDisplacement of movable sections = 0 to 8 cmOperating
hydraulic pressure = 8.3 MPaMaximum Actuator force = 8.9 kN |
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