Vibration isolation

Vibration isolation

Vibration isolation is the process of isolating an object, such as a piece of equipment, from the source of vibrations.

Passive isolation

Passive vibration isolation systems consist essentially of a mass, spring and damper (dash-pot).

Active isolation

Active vibration isolation systems contain, along with the spring, a feedback circuit which consists of a piezoelectric accelerometer, a controller, and an electromagnetic transducer. The acceleration (vibration) signal is processed by a control circuit and amplifier. Then it feeds the electromagnetic actuator, which amplifies the signal. As a result of such a feedback system, a considerably stronger suppression of vibrations is achieved compared to ordinary damping.

ubframe isolation

Another technique used to increase isolation is to use an isolated subframe. This splits the system with an additional mass/spring/damper system. This doubles the high frequency attenuation rolloff, at the cost of introducing additional low frequency modes which may cause the low frequency behaviour to deteriorate. This is commonly used in the rear suspensions of cars with Independent Rear Suspension (IRS), and in the front subframes of some cars. The graph "(see illustration)" shows the force into the body for a subframe that is rigidly bolted to the body compared with the red curve that shows a compliantly mounted subframe. Above 42 Hz the compliantly mounted subframe is superior, but below that frequency the bolted in subframe is better.

References

* Harris, C., Piersol, A. , "Harris Shock and Vibration Handbook, Fifth Edition", McGraw-Hill, (2002), ISBN 0-07-137081-1 .

ee also

* Shock absorber
* Vibration
* Noise, Vibration, and Harshness
* Vibration-isolation
* Base isolation
* Vibration control
* Earthquake Protector

External links

* at Lord Corporation
* [http://www.engineeringtalk.com/news/mqp/mqp100.html "Vibration isolation is the key to accuracy"] article at EngineeringTalk.com


Wikimedia Foundation. 2010.

Игры ⚽ Нужно решить контрольную?

Look at other dictionaries:

  • vibration isolation — the process of reducing the level of transmission of vibrational energy from a disturbing source to that of its environment. Air springs, elastomeric and wire rope isolators provide vibration isolation that reduces transmission of vibrations that …   Mechanics glossary

  • Treadmill with Vibration Isolation Stabilization — Astronaut Sunita Suni Williams bungeed to the TVIS treadmill aboard the International Space Station. The Treadmill with Vibration Isolation Stabilization System, commonly abbreviated as TVIS, is a treadmill for use on board the International… …   Wikipedia

  • isolation — vibration isolation …   Mechanics glossary

  • Vibration — For the soul music group, see The Vibrations. For the machining context, see Machining vibrations. For the albums, see Vibrations (Roy Ayers album) and Vibrations (The Three Sounds album). Classical mechanics …   Wikipedia

  • Isolation Phonique — Pour les articles homonymes, voir Isolation. L isolation phonique, ou isolation acoustique, a pour objectif d éviter la propagation du bruit. Dans un milieu compressible, le plus souvent dans l’air, le son se propage sous forme d une variation de …   Wikipédia en Français

  • Isolation acoustique — Isolation phonique Pour les articles homonymes, voir Isolation. L isolation phonique, ou isolation acoustique, a pour objectif d éviter la propagation du bruit. Dans un milieu compressible, le plus souvent dans l’air, le son se propage sous forme …   Wikipédia en Français

  • Isolation sonore — Isolation phonique Pour les articles homonymes, voir Isolation. L isolation phonique, ou isolation acoustique, a pour objectif d éviter la propagation du bruit. Dans un milieu compressible, le plus souvent dans l’air, le son se propage sous forme …   Wikipédia en Français

  • Isolation phonique — Pour les articles homonymes, voir Isolation. L isolation phonique, ou isolation acoustique, a pour objectif d éviter la propagation du bruit. Dans un milieu compressible, le plus souvent dans l’air, le son se propage sous forme d une variation de …   Wikipédia en Français

  • Vibration — Vibrationen sind in der Mechanik periodische, meist mittel bis höherfrequente und niederamplitudige Schwingungen von Stoffen und Körpern, die entweder selbst elastisch sind oder aus elastisch verbundenen Einzelteilen oder Bausteinen bestehen.… …   Deutsch Wikipedia

  • Vibration control — In earthquake engineering, vibration control is a set of technical means aimed to mitigate seismic impacts in building and non building structures [http://www.ecs.csun.edu/ shustov/Seismic Control Directory.html] . All seismic vibration control… …   Wikipedia

Share the article and excerpts

Direct link
… Do a right-click on the link above
and select “Copy Link”