Matches in DBpedia 2014 for { <http://dbpedia.org/resource/Active_vibration_control> ?p ?o. }
Showing items 1 to 24 of
24
with 100 items per page.
- Active_vibration_control abstract "Active vibration control is the active application of force in an equal and opposite fashion to the forces imposed by external vibration. With this application, a precision industrial process can be maintained on a platform essentially vibration-free.Many precision industrial processes cannot take place if the machinery is being affected by vibration. For example, the production of semiconductor wafers requires that the machines used for the photolithography steps be used in an essentially vibration-free environment or the sub-micrometre features will be blurred. Active vibration control is now also commercially available for reducing vibration in helicopters, offering better comfort with less weight than traditional passive technologies.In the past, passive techniques were used. These include traditional vibration dampers, shock absorbers, and base isolation.The typical active vibration control system uses several components: A massive platform suspended by several active drivers (that may use voice coils, hydraulics, pneumatics, piezo-electric or other techniques) Three accelerometers that measure acceleration in the three degrees of freedom An electronic amplifier system that amplifies and inverts the signals from the accelerometers. A PID controller can be used to get better performance than a simple inverting amplifier. For very large systems, pneumatic or hydraulic components that provide the high drive power required.If the vibration is periodic, then the control system may adapt to the ongoing vibration, thereby providing better cancellation than would have been provided simply by reacting to each new acceleration without referring to past accelerations.".
- Active_vibration_control wikiPageID "1314419".
- Active_vibration_control wikiPageRevisionID "571345789".
- Active_vibration_control hasPhotoCollection Active_vibration_control.
- Active_vibration_control subject Category:Earthquake_engineering.
- Active_vibration_control subject Category:Mechanical_vibrations.
- Active_vibration_control type Abstraction100002137.
- Active_vibration_control type Act100030358.
- Active_vibration_control type Action100037396.
- Active_vibration_control type Change100191142.
- Active_vibration_control type Event100029378.
- Active_vibration_control type MechanicalVibrations.
- Active_vibration_control type Motion100331950.
- Active_vibration_control type PsychologicalFeature100023100.
- Active_vibration_control type Vibration100345926.
- Active_vibration_control type YagoPermanentlyLocatedEntity.
- Active_vibration_control comment "Active vibration control is the active application of force in an equal and opposite fashion to the forces imposed by external vibration. With this application, a precision industrial process can be maintained on a platform essentially vibration-free.Many precision industrial processes cannot take place if the machinery is being affected by vibration.".
- Active_vibration_control label "Active vibration control".
- Active_vibration_control sameAs m.04s6zp.
- Active_vibration_control sameAs Q4677595.
- Active_vibration_control sameAs Q4677595.
- Active_vibration_control sameAs Active_vibration_control.
- Active_vibration_control wasDerivedFrom Active_vibration_control?oldid=571345789.
- Active_vibration_control isPrimaryTopicOf Active_vibration_control.