However the single plane of suspension allowed the microphone to twist very easily once microphones started to become directional, this twisting caused fading of the signal. When early microphones were heavy and omnidirectional, this was adequate. Generally, a molded rubber mount is best suited for heavy loads producing higher frequency vibrations.Īstatic crystal microphone in a 'ring and spring' mountĮarly microphones used a 'ring and spring' mount, where a single rigid ring was mounted and carried the microphone between a number of coil springs, usually four or eight. Temperature is a factor in the dynamic response of rubber. Some form of dashpot is usually used with a spring to provide viscous damping. Other shock mounts have mechanical springs or an elastomer (in tension or compression) engineered to isolate an item from specified mechanical shock and vibration. Rubber bushings compress synthetic rubber rings on bolts to provide some isolation – operating temperature is sometimes a factor. The best example of this is automotive engine and transmission mounts. Molded rubber isolation mounts are typically manufactured for specific applications. Generally, these pads consist of a cork or polymeric foam core which has been laminated between two pieces of ribbed neoprene sheet. One common type of isolation mounts is laminated pads. Hydraulic and pneumatic components can be included, depending on the use. Maxwell and Kelvin–Voigt models of viscoelasticity use springs and dashpots in series and parallel circuits respectively. Shock mounts are used to isolate entire buildings from the movement of the ground in earthquakes, called base isolators. The shock response spectrum is a method for further evaluating a mechanical shock. A shock pulse is characterised by its peak acceleration, the duration, and the shape of the shock pulse (half sine, triangular, trapezoidal, etc.). This and nature of the input shock and vibration must be matched. 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. 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. Military equipment and ships need to be able to withstand nearby explosions. Sensitive laboratory equipment needs to be isolated from handling shocks and ambient vibration. Shock mounts can be used to isolate sensitive equipment from undesirable dynamics of the foundation or substrate. 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. Without isolation mounts, the interior noise and comfort level in today's vehicles would be significantly different than what we have grown accustomed to. Īnother common example of this are the motor and transmission mounts that are used in virtually every automobile manufactured today. This is usually done through elastic supports and transmission couplings. Yachts also use shock mounts to dampen the noise (mainly the one transmitted throughout the structure) and increase the comfort. This is vital on submarines where silence is critical to mission success. Shock mounts can be used to isolate the foundation or substrate from the dynamics of the mounted equipment. Shock mounts can be found in a wide variety of applications. Explosive shock test of naval ship equipment on board is isolated from shocks by shock mounts
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