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-as of [12 OCTOBER 2024]-
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___*aka*___
“isolation mount”
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-in a variety of ‘applications’, a ‘shock mount’ is a ‘mechanical fastener’ that connects 2 parts ‘elastically’-
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*they are used for ‘shock/vibration isolation’*
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Isolation mounts allow a piece of equipment to be securely mounted to a foundation and/or frame and, at the same time, allow it to float independently from the ‘sub-strate’
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Uses
Explosive shock test of naval ship; equipment on board is isolated from shocks by shock mounts
Shock mounts can be found in a wide variety of applications.
Shock mounts can be used to isolate the foundation or substrate from the dynamics of the mounted equipment.
This is vital on submarines where silence is critical to mission success.
Yachts also use shock mounts to dampen the noise (mainly the one transmitted throughout the structure) and increase the comfort.
This is usually done through elastic supports and transmission couplings.[1]
Another common example of this are the motor and transmission mounts that are used in virtually every automobile manufactured today.
Without isolation mounts, the interior noise and comfort level in today’s vehicles would be significantly different than what we have grown accustomed to.
In this case, shock and vibration isolation mounts are often chosen by the nature of the dynamics produced by the equipment and the weight of the equipment.
Shock mounts can be used to isolate sensitive equipment from undesirable dynamics of the foundation or substrate.
Sensitive laboratory equipment needs to be isolated from handling shocks and ambient vibration.
Military equipment and ships need to be able to withstand nearby explosions.
Shock mounts are found in some disc drives and compact disc players, in which soft bushings are all that mechanically hold the disk and reading assembly, thereby isolating it from outside vibrations and from other outside loads such as torsion.[2]
In this case, isolation mounts are often chosen by the sensitivity of the equipment to shock (fragility) and vibration (natural frequency) and the weight of the equipment.
This and nature of the input shock and vibration must be matched.
A shock pulse is characterised by its peak acceleration, the duration, and the shape of the shock pulse (half sine, triangular, trapezoidal, etc.).
The shock response spectrum is a method for further evaluating a mechanical shock.[3]
Shock mounts are used to isolate entire buildings from the movement of the ground in earthquakes, called base isolators.
One of two shock mounts holding the back of the Eames Lounge Chair Wood (LCW)
The black rubber is glued to the wood and the bolt only connects the metal to the rubber.
There are three similar shock mounts supporting the seat.
A similar idea, also known as a shock mount, is found in furniture design, introduced by Charles and Ray Eames.
This provides some shock absorption and serves as a living hinge, allowing the seat back to pivot.
Shock mounts are also sometimes used in bicycle saddles,[4] or their handlebars.
Design[edit]
Molded Rubber Shock Isolation Mount
Maxwell and Kelvin–Voigt models of viscoelasticity use springs and dashpots in series and parallel circuits respectively.
Hydraulic and pneumatic components can be included, depending on the use
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Laminated pads
One common type of isolation mounts is laminated pads.
Generally, these pads consist of a cork or polymeric foam core which has been laminated between two pieces of ribbed neoprene sheet
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Molded rubber isolation mounts
Molded rubber isolation mounts are typically manufactured for specific applications.
The best example of this is automotive engine and transmission mounts.
Rubber bushings compress synthetic rubber rings on bolts to provide some isolation – operating temperature is sometimes a factor.
Other shock mounts have mechanical springs or an elastomer (in tension or compression) engineered to isolate an item from specified mechanical shock and vibration.
Some form of dashpot is usually used with a spring to provide viscous damping.
Viscoelastic materials are common.
Temperature is a factor in the dynamic response of rubber.
Generally, a molded rubber mount is best suited for heavy loads producing higher frequency vibrations
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Cable isolation mounts
Cable mounts are based around a coil of wire rope fixed to an upper and lower mounting bar
When properly matched to the load, these mounts provide isolation over a broad frequency range.
They are typically applied to high performance applications, such as mounting sensitive instrumentation into off-road vehicles and shipboard
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Coil spring isolation mounts
Typical Coil Spring Isolation Mount
Coil spring isolation mounts generally provide the greatest degree of movement and the best low frequency performance.
They are particularly popular for mounting equipment in buildings such as air handlers, filtration units, air conditioning and refrigeration systems and large pipes.
Their degree of movement makes them ideal for applications where high flexure and/or expansion and contraction are a consideration
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See also
Bushing
Vibration isolation
Shock absorber
MIL-S-901
Microphonics
Cushioning
References[edit]
^ “Vulkan: il segreto per creare il silenzio a bordo degli yacht”. Barche Magazine ISP. 2018-01-13. Retrieved 2021-04-16.
^ US 5,761,031, Ajmani, R S, “Conductive shock mount for reducing electromagnetic interference in a disk drive system”, issued 2 June 1998
^ J E, Alexander (2009), The Shock Response Spectrum – A Primer (PDF), IMAC–XXVII, Society for Experimental Mechanics, archived from the original (PDF) on 2016-03-04, retrieved 9 Feb 2015
^ US 6019422, Taormino, J S & Caselli, “Laterally pivoting bicycle saddle mount with shock absorber”, published 1 Feb 2000
^ US3598353A, DeGrey, “Air-damped shock mount”, published 1971
^ US4397069A, Camossi, “Device and process for the manufacture of vibration-damping and shockproof mountings incorporating at least one helically arranged metal cable and mounting thereby obtained”, published 1983
^ US4783038A, Gilbert, LeKuch, Ferri, “Isolator Apparatus”, published 1988
DeSilva, C. W., “Vibration and Shock Handbook”, CRC, 2005, ISBN 0-8493-1580-8
Harris, C. M., and Peirsol, A. G. “Shock and Vibration Handbook”, 2001, McGraw Hill, ISBN 0-07-137081-1
External links[edit]
Shock and vibration testing of shock mounts [1]
en.wikipedia.org /wiki/Shock_mount
Shock mount
Contributors to Wikimedia projects8-10 minutes 10/19/2006
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