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- 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 strategy has been successfully implemented for vibration attenuation of beam, plate and shell structures by numerous researchers. For active vibration control strategy, the structure should be smart enough to sense external disturbances and react accordingly. In order to develop an active structure (also known as smart structure), smart materials must be integrated or embedded with the structure. The smart structure involves sensors (strain, acceleration, velocity, force etc.), actuators (force, inertial, strain etc.) and a control algorithm (feedback or feed forward). The number of smart materials have been investigated and fabricated over the years; some of them are shape memory alloys, piezoelectric materials, optical fibers, electro-rheological fluids, magneto-strictive materials.".
- Active_vibration_control wikiPageID "1314419".
- Active_vibration_control wikiPageLength "5929".
- Active_vibration_control wikiPageOutDegree "38".
- Active_vibration_control wikiPageRevisionID "704334816".
- Active_vibration_control wikiPageWikiLink Accelerometer.
- Active_vibration_control wikiPageWikiLink Active_noise_control.
- Active_vibration_control wikiPageWikiLink Amplifier.
- Active_vibration_control wikiPageWikiLink Base_isolation.
- Active_vibration_control wikiPageWikiLink Beam_(structure).
- Active_vibration_control wikiPageWikiLink Category:Earthquake_engineering.
- Active_vibration_control wikiPageWikiLink Category:Mechanical_vibrations.
- Active_vibration_control wikiPageWikiLink Damping.
- Active_vibration_control wikiPageWikiLink Degrees_of_freedom_(physics_and_chemistry).
- Active_vibration_control wikiPageWikiLink ERF_damper.
- Active_vibration_control wikiPageWikiLink Electronics.
- Active_vibration_control wikiPageWikiLink Feed_forward_(control).
- Active_vibration_control wikiPageWikiLink Feedback.
- Active_vibration_control wikiPageWikiLink Frequency.
- Active_vibration_control wikiPageWikiLink Hydraulics.
- Active_vibration_control wikiPageWikiLink Machine_(mechanical).
- Active_vibration_control wikiPageWikiLink Magnetorheological_fluid.
- Active_vibration_control wikiPageWikiLink Mass.
- Active_vibration_control wikiPageWikiLink Micrometre.
- Active_vibration_control wikiPageWikiLink Noise-cancelling_headphones.
- Active_vibration_control wikiPageWikiLink Optical_fiber.
- Active_vibration_control wikiPageWikiLink PID_controller.
- Active_vibration_control wikiPageWikiLink Photolithography.
- Active_vibration_control wikiPageWikiLink Piezoelectricity.
- Active_vibration_control wikiPageWikiLink Plate_(structure).
- Active_vibration_control wikiPageWikiLink Pneumatics.
- Active_vibration_control wikiPageWikiLink Semiconductor.
- Active_vibration_control wikiPageWikiLink Shape-memory_alloy.
- Active_vibration_control wikiPageWikiLink Shell_(structure).
- Active_vibration_control wikiPageWikiLink Shock_absorber.
- Active_vibration_control wikiPageWikiLink Signal_(electrical_engineering).
- Active_vibration_control wikiPageWikiLink Vibration.
- Active_vibration_control wikiPageWikiLink Vibration_control.
- Active_vibration_control wikiPageWikiLink Voice_coil.
- Active_vibration_control wikiPageWikiLink Wafer_(electronics).
- Active_vibration_control wikiPageWikiLink Wikt:invert.
- Active_vibration_control wikiPageWikiLinkText "Active vibration control".
- Active_vibration_control wikiPageWikiLinkText "Electronic vibration control".
- Active_vibration_control wikiPageWikiLinkText "active control devices".
- Active_vibration_control wikiPageWikiLinkText "active vibration control".
- Active_vibration_control wikiPageWikiLinkText "active".
- Active_vibration_control wikiPageWikiLinkText "anti-vibration systems".
- Active_vibration_control wikiPageWikiLinkText "vibration control".
- Active_vibration_control wikiPageUsesTemplate Template:Reflist.
- Active_vibration_control wikiPageUsesTemplate Template:Unreferenced.
- Active_vibration_control subject Category:Earthquake_engineering.
- Active_vibration_control subject Category:Mechanical_vibrations.
- Active_vibration_control hypernym Application.
- Active_vibration_control type Software.
- Active_vibration_control type Dynamic.
- Active_vibration_control type Mechanic.
- Active_vibration_control type Vibration.
- 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 Q4677595.
- Active_vibration_control sameAs m.04s6zp.
- Active_vibration_control sameAs Q4677595.
- Active_vibration_control wasDerivedFrom Active_vibration_control?oldid=704334816.
- Active_vibration_control isPrimaryTopicOf Active_vibration_control.