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These assemblies can withstand high compression loads (along Oz): up to1,000 tons/sq.meter.
They can absorb shear deformation (along Ox and Oy) of 50 to 100% of their height.
Cylindrical or annular type assemblies can also withstand torsional displacement around axis Oz.
In rotation around axes Oy and Ox, these mountings enable angular or low amplitude rotation errors (approximately 1°).
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Conical (fig. 1) or spherical (fig. 2) units are used to absorb very high axial loads of up to150 tons.
Angular movement around an axis (Oz in the case of the conical bearing) or a centre of rotation (O in the case of the spherical bearing) are in the order of ± 10°.
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Laminated BUSHES use the same principle as other laminated bearings. Importance is primarily given to radial load capability along Ox and Oy which may be up to 100 tons.
Movement is allowed around an axis Oz or a centre of rotation O. Angular deflection is in the order of 30°.
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The main role of these mountings is to isolate vibration. A snubber system limits the movement of the suspended mass (10 mm), however the loads developed in this case, are high.
A wide load range from 5 to 320 N depending upon the application.
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– Vertical own frequencies under nominal loads of 5 to 7 Hz.
– Own lateral frequencies under nominal loads of 3 to 6 Hz.
– Stop after 10 mm of displacement. Maximum force on the top of 30 g
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The permitted deflection (40 to 50 mm) of the suspended mass in relation to the mounting base limits reaction under shock.No efficient vibration protection is offerred during shock.
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A load range of between 30 to 1,080 kg, depending on the different configuration and shock specification.
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These mountings were developed to handle small loads under large deflection (75 mm) and provide a low vibration transmission over a wide frequency range (up to 500 Hz).
The system developed provides this dual function effectively and without compromise.
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– Natural frequency (vertical and lateral) under nominal load: 4 to 5.5 Hz.
– Maximum displacement under shock:75 mm all in directions.
– Mechanical strength: 30 g
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Natural frequencies under nominal load:
– axial: 10 to 30 Hz
– radial: 15 to 40 Hz
Maximum displacement in axial shock: ± 5 mm
Temperature range: 0 to 175° C
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A decoupling washer is composed of:
– 2 bonded elastomer washers
– 1 stainless steel anti-shock washer
– 1 stainless steel preload spacer
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The progress in motor vehicle design and increased demand for comfort both in terms of vibration and sound-proofing has resulted inincreasingly demanding specifications for suspension systems.
PAULSTRA hydraulic mountings use an elastomer support device combined with an hydraulic system. The hydraulic system acts differentially and specifically in relation to the frequency range and the type of vibrational excitation incurred.
These mountings, due to a total integration of all components, are still compatible with standard sizes and are as easy to fit as conventional mountings.
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Models are available in different elastomers: silicon, fireproofed silicon, fluorosilicon or neoprene, to meet the requirements of the main aeronautics standards (FAR 25 – AIR 7304 – MIL STD 810 – C 172 C -MAR 508 s.o.).
Covering a natural frequency range of 15 to 50 Hz, their applications range from vibration isolation to shock-protection of electronic apparatus and also aircraft fuselage and helicopter cockpit mountings.