SCUD-B Typical Avionics Component
The avionics shelves were made from hardwood. The wooden fibers may provide better damping then, say, an aluminum shelf. A possible disadvantage of wood is that the shelf would be unable to serve as an electrical or thermal ground plane.
The bushings are made from some type of rubber or elastomeric compound.
The bushings provide damping, but their main benefits are:
1. To render the isolated system as a single-degree-of-freedom system
2. To lower the natural frequency of the system
The isolators thus attenuate the shock and vibration energy which flows from the instrument shelf into the avionics component.
See also: Vibrationdata May 2010 Newsletter, Scud-B Missile Design
NASA/JPL, Mars Science Laboratory
Sensor Support Electronics mounted on wire rope isolators
European Space Agency Inertial Measurement Unit (IMU) mounted to outer bracket via four black conical isolators, vibration test
Automobiles usually have a fundamental spring-mass frequency of 1 to 2.5 Hz depending on the model type. The shock absorbers provide about 33% viscous damping.
Titan II Missile Silo, Launch Control Room
The control room is mounted underground via huge isolation springs. A typical spring is shown in the background. The purpose is to isolate the control room from mechanical shock and vibration in the event of a nuclear strike above the launch site. The springs allow 18 inches of relative displacement. The control room could thus carry out a retaliatory strike, as ordered by the U.S. president.
This site is located south of Tucson, Arizona. It has been decommissioned and is now a museum.
– Tom Irvine
Ariane 5 MLP Damper for Reducing Wind Response
The USS Alabama World War II Battleship.
Photos Courtesy of Robert Towner.
An isolation spring inside the ship is shown in the center of the photo.
Isolation springs for the ship’s piping system.
RESTON-SA shock absorber for seismic isolation of Taipei City Hospital. Link